Official Paper

RRB ALP CBT-II (Refrigeration & Air Conditioning Mechanic) Official Paper (Held On: 06 May, 2025 Shift 2) (Previous Year Paper)

175 questions · 150 minutes · with answers · free

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Part A (100 questions)

1

A can complete a work in 14 hours, while B can do the same work in 21 hours. A started working alone. After how many hours should B join A so that the total work is completed in 10 hours?

  1. ((a))

    3

  2. ((b))

    4.5

  3. ((c))

    3.5

  4. ((d))

    4

Show Answer
Answer: ((a))

3

2

Why is regular maintenance of HVAC systems considered a medium ECO?

  1. ((a))

    It decreases the system's energy consumption.

  2. ((b))

    It prevents overheating of the system.

  3. ((c))

    It increases the cost of energy.

  4. ((d))

    It speeds up system breakdowns.

Show Answer
Answer: ((a))

It decreases the system's energy consumption.

3

The speed of a train is 144 km/hr. The distance covered by the train in 12 seconds is:

  1. ((a))

    480 m

  2. ((b))

    103 m

  3. ((c))

    518 m

  4. ((d))

    78 m

Show Answer
Answer: ((a))

480 m

4

In a certain code language, 'GOES' is coded as '8624' and 'SNYC' is coded as '3817'.

What is the code for 'S' in the given code language?

  1. ((a))

    8

  2. ((b))

    4

  3. ((c))

    3

  4. ((d))

    2

Show Answer
Answer: ((a))

8

5

In a certain code language, 'BOAT' is coded as '8654' and 'AIDS' is coded as '3517'.

What is the code for 'A' in the given code language?

  1. ((a))

    6

  2. ((b))

    5

  3. ((c))

    3

  4. ((d))

    8

Show Answer
Answer: ((a))

6

6

The weights (in kg) of 20 students of a class have been recorded as 35, 42, 56, 44, 55, 44, 36, 44, 49, 48, 55, 35, 44, 47, 49, 48, 56, 44, 37 and 35. The modal weight (in kg) of the class is:

  1. ((a))

    47

  2. ((b))

    37

  3. ((c))

    44

  4. ((d))

    45

Show Answer
Answer: ((a))

47

7

Pipes A and B can fill a rectangular tank in 40 minutes and 120 minutes, respectively. Pipe C can empty the completely filled same tank in 240 minutes. If pipes A, B and C are opened at the same time, then how many minutes will it take to fill the tank?

  1. ((a))

    342834\frac{2}{8}

  2. ((b))

    342734\frac{2}{7}

  3. ((c))

    322732\frac{2}{7}

  4. ((d))

    343734\frac{3}{7}

Show Answer
Answer: ((a))

342834\frac{2}{8}

8

Which of the following actions involves scientific work?

  1. ((a))

    Spending time conversing with friends

  2. ((b))

    Climbing up the stairs

  3. ((c))

    Watching a film

  4. ((d))

    Holding a large load on one's head while standing motionless

Show Answer
Answer: ((a))

Spending time conversing with friends

9

How is a voltmeter connected in a circuit to measure potential difference?

  1. ((a))

    In parallel across the points where potential difference is to be measured

  2. ((b))

    In series with the circuit

  3. ((c))

    Neither in series nor in parallel

  4. ((d))

    Directly to the power source only

Show Answer
Answer: ((a))

In parallel across the points where potential difference is to be measured

10

Find the minimum value of 2x 2 - 5x - 3 and also find x.

  1. ((a))
    • 6.125 and x = 1.25
  2. ((b))

    -6.125 and x = 0.25

  3. ((c))

    6.125 and x = 1.25

  4. ((d))

    6.125 and x = 1.2

Show Answer
Answer: ((a))
  • 6.125 and x = 1.25
11

Based on the English alphabetical order, three of the following four letter-clusters are alike in a certain way and thus form a group. Which letter-cluster DOES NOT belong to that group? (Note: The odd one out is not based on the number of consonants/vowels or their position in the letter-cluster.)

  1. ((a))

    CGXF

  2. ((b))

    UYPW

  3. ((c))

    QULS

  4. ((d))

    JNEL

Show Answer
Answer: ((a))

CGXF

12

Which of the following letter-number clusters will replace the question mark (?) in the given series to make it logically complete?

AD8, FI16, KN24, ?

  1. ((a))

    OS32

  2. ((b))

    OR35

  3. ((c))

    PS35

  4. ((d))

    PS32

Show Answer
Answer: ((a))

OS32

13

Select the pair which follows the same pattern as that followed by the two sets of pairs given below. Both pairs follow the same pattern.

ARF: YTH

WVJ: UXL

  1. ((a))

    MEL: HZN

  2. ((b))

    SZN: QBP

  3. ((c))

    QEB: NBD

  4. ((d))

    KXF: HZH

Show Answer
Answer: ((a))

MEL: HZN

14

By how much is 60% of 50 greater than 45\frac{4}{5}of 35?

  1. ((a))

    2

  2. ((b))

    3

  3. ((c))

    4

  4. ((d))

    1

Show Answer
Answer: ((a))

2

15

Which of the following is NOT an SI unit?

  1. ((a))

    Hour

  2. ((b))

    Metre

  3. ((c))

    Mole

  4. ((d))

    Kilogram

Show Answer
Answer: ((a))

Hour

16

The speed of a bus is 6 metres/second. The distance (in kilometres) travelled by the bus in 8 hours and 20 minutes is:

  1. ((a))

    185

  2. ((b))

    180

  3. ((c))

    184

  4. ((d))

    175

Show Answer
Answer: ((a))

185

17

Three partners, A, B and C, shared the profit in a business in the proportion of 11: 13: 16. They invested their capitals for 7 months, 5 months and 12 months, respectively. What was the ratio of their capitals?

  1. ((a))

    165 :273 :140

  2. ((b))

    96: 135: 101

  3. ((c))

    3:5:8

  4. ((d))

    21:35:44

Show Answer
Answer: ((a))

165 :273 :140

18

T-Square is used to _______in engineering drawings.

  1. ((a))

    support the drawing paper/tracing paper for making drawings

  2. ((b))

    draw curved lines on drawing sheets

  3. ((c))

    draw horizontal lines, parallel lines and to guide/hold the setsquares

  4. ((d))

    transfer dimensions and dividing lines into a number of equal parts

Show Answer
Answer: ((a))

support the drawing paper/tracing paper for making drawings

19

Which of the following features is unique to Telegram compared to WhatsApp and Facebook Messenger?

  1. ((a))

    Voice and video calling capabilities

  2. ((b))

    End-to-end encryption for all messages

  3. ((c))

    Ability to create channels for broadcasting messages to large audiences

  4. ((d))

    Integration with Facebook for seamless sharing

Show Answer
Answer: ((a))

Voice and video calling capabilities

20

Calculate the resistance of the bulb filament if it draws 200 mA current from 220 V source.

  1. ((a))

    0Ω

  2. ((b))

    1100 Ω

  3. ((c))

    220 Ω

  4. ((d))

    44 Ω

Show Answer
Answer: ((a))

0Ω

21

Which of the following processes causes accumulation of heavy metals such as lead and mercury in soil?

  1. ((a))

    Ozone layer depletion

  2. ((b))

    Improper disposal of industrial wastes

  3. ((c))

    Water evaporation

  4. ((d))

    Natural soil formation

Show Answer
Answer: ((a))

Ozone layer depletion

22

What should come in place of the question mark (?) in the given series?

WU5, SQ7, NL11, ?

  1. ((a))

    GE17

  2. ((b))

    HF13

  3. ((c))

    GE13

  4. ((d))

    HE15

Show Answer
Answer: ((a))

GE17

23

Which of the following statements is correct?

  1. ((a))

    All metals are poor conductors of heat.

  2. ((b))

    Plastic and wood allow heat to pass through them easily.

  3. ((c))

    Dry air is a good conductor of heat.

  4. ((d))

    Copper and aluminium are good conductors of heat

Show Answer
Answer: ((a))

All metals are poor conductors of heat.

24

If 24 joules of work is done in moving a charge of 2 coulombs across two points, then what will be the correct voltage across these two points?

  1. ((a))

    2 V

  2. ((b))

    12 V

  3. ((c))

    24 V

  4. ((d))

    48 V

Show Answer
Answer: ((a))

2 V

25

The two sides CB and BA of triangle ABC are produced to CE and BD, respectively, in such a way that angle DAC = 110° ; and angle ABE = 130° . Which of the following options is true?

  1. ((a))

    AC <AB < BC

  2. ((b))

    BC <AC <AB

  3. ((c))

    AB <AC <BC

  4. ((d))

    BC <AB < AC

Show Answer
Answer: ((a))

AC <AB < BC

26

The marked price of an item is ₹27,500. The shopkeeper gave two successive discounts: the first discount was 20%, and the second was 30% of the first discount rate. What is the selling price of the item (in rupees)?

  1. ((a))

    1,26,080

  2. ((b))

    20,860

  3. ((c))

    20,086

  4. ((d))

    20,680

Show Answer
Answer: ((a))

1,26,080

27

Which of the following letter-clusters should replace # and % so that the pattern and relationship followed between the letter-cluster pair on the left side of:: is the same as that on the right side of ::?

#: KHM:: OLQ: %

  1. ((a))

    #LIN, % = NKO

  2. ((b))

    #LIN, % = NLP

  3. ((c))

    #LIN, %= NKP

  4. ((d))

    #LIM, % = NKP

Show Answer
Answer: ((a))

#LIN, % = NKO

28

Which of the following statements is INCORRECT?

  1. ((a))

    In solids, heat transfer is typically carried out through conduction.

  2. ((b))

    Burning of feet on hot sand is an example of heat transfer by conduction.

  3. ((c))

    Conduction is the process of heat transfer that does not require any medium to transfer heat

  4. ((d))

    Conduction is the process of heat transfer from hotter body to colder body.

Show Answer
Answer: ((a))

In solids, heat transfer is typically carried out through conduction.

29

A man rides a bicycle from Point A to Point B in 10 minutes and comes back to Point A along the same path in 10 minutes. If the distance between Points A and B is 1 km, calculate his average velocity?

  1. ((a))

    3.3 m/s

  2. ((b))

    1.6 m/s

  3. ((c))

    0 m/s

  4. ((d))

    0.1 m/s

Show Answer
Answer: ((a))

3.3 m/s

30

What is the dimensional equation of mass density (p)?

  1. ((a))

    [ML-3T2]

  2. ((b))

    [M0 L³ T0]

  3. ((c))

    [ML-3T0]

  4. ((d))

    [M L-2 T0]

Show Answer
Answer: ((a))

[ML-3T2]

31

What is the kinetic energy possessed by an object having mass 25 kg and moving with a uniform velocity of 2 m s-¹?

  1. ((a))

    80 J

  2. ((b))

    50 J

  3. ((c))

    120 J

  4. ((d))

    100 J

Show Answer
Answer: ((a))

80 J

32

What is the value of 100 g in Sl units?

  1. ((a))

    1 kg

  2. ((b))

    0.1 kg

  3. ((c))

    100 kg

  4. ((d))

    10 kg

Show Answer
Answer: ((a))

1 kg

33

A mass m is moving with a velocity v and its kinetic energy is K. What will be the new kinetic energy if the velocity is doubled?

  1. ((a))

    2K

  2. ((b))

    K

  3. ((c))

    4 K

  4. ((d))

    K/2

Show Answer
Answer: ((a))

2K

34

Which of the following is a main greenhouse gas that is responsible for global warming?

  1. ((a))

    Nitrogen

  2. ((b))

    Helium

  3. ((c))

    Carbon Dioxide

  4. ((d))

    Oxygen

Show Answer
Answer: ((a))

Nitrogen

35

Which of the following tools is commonly used to support the 'Standardize' step in the 5S methodology?

  1. ((a))

    Labels and signs

  2. ((b))

    Cleaning supplies

  3. ((c))

    Floor markings

  4. ((d))

    Job cycle charts

Show Answer
Answer: ((a))

Labels and signs

36

Based on the English alphabetical order, three of the following four letter-clusters are alike in a certain way and thus form a group. Which letter-cluster DOES NOT belong to that group?

(Note: The odd one out is not based on the number of consonants/vowels or their position in the letter-cluster.)

  1. ((a))

    GMKT

  2. ((b))

    EKJR

  3. ((c))

    VBZI

  4. ((d))

    IOMV

Show Answer
Answer: ((a))

GMKT

37

What should come in place of the question mark (?) in the given alpha-numeric series?

Y13, F11, L9, Q7, U5, X3, ?

  1. ((a))

    22

  2. ((b))

    A1

  3. ((c))

    Z1

  4. ((d))

    Y1

Show Answer
Answer: ((a))

22

38

Given below are two sets of numbers. Both the sets are formed using the same mathematical equations or follow a common pattern. Which of the given options follows the same set of mathematical equations or patterns as the sets given in the question?

1333-1730-2199-2746-3377

218-345-514-731-1002

  1. ((a))

    123 - 146 - 171 - 198 - 227

  2. ((b))

    38 - 51 - 66 - 83 - 102

  3. ((c))

    3-10-29-66-127

  4. ((d))

    3 - 6 - 11 - 18 - 27

Show Answer
Answer: ((a))

123 - 146 - 171 - 198 - 227

39

Two sets of numbers are given below. In each set of numbers, certain mathematical operation(s) on the first number results in the second number. Similarly, certain mathematical operation(s) on the second number results in the third number and so on. Which of the given options follows the same set of operations as in the given sets?

(NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into their constituent digits. E.g. 13-Operations on 13 such as adding/subtracting/multiplying to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)

988-494-444-534; 894-447-397-487

  1. ((a))

    138 - 69 - 14 - 98

  2. ((b))

    226 - 113 - 144 - 268

  3. ((c))

    586 - 293 - 244 - 328

  4. ((d))

    682-341-291-381

Show Answer
Answer: ((a))

138 - 69 - 14 - 98

40

What is the first step to take in case of a power failure in a workshop?

  1. ((a))

    Continue working as usual

  2. ((b))

    Check if emergency lighting and backup power are functional

  3. ((c))

    Panic and leave the premises immediately

  4. ((d))

    Ignore the situation and wait for power to return

Show Answer
Answer: ((a))

Continue working as usual

41

Which of the following is an ethical concern related to Information Technology?

  1. ((a))

    Enhancement of communication channels

  2. ((b))

    Privacy violations and data breaches

  3. ((c))

    Reduction in administrative costs

  4. ((d))

    Increased accessibility to educational resources

Show Answer
Answer: ((a))

Enhancement of communication channels

42

Which term is used to describe the closeness of the measured value to the standard or true value?

  1. ((a))

    Mean

  2. ((b))

    Precision

  3. ((c))

    Approximate

  4. ((d))

    Accuracy

Show Answer
Answer: ((a))

Mean

43

Which of the following is NOT correct about Joule's law of heating?

  1. ((a))

    Heat produced in a resistor is directly proportional to the square of the current for a given resistance.

  2. ((b))

    Heat produced in a resistor is directly proportional to the time for which the current flows through the resistor.

  3. ((c))

    Heat produced in a resistor is directly proportional to the resistance for a given current.

  4. ((d))

    Heat produced in a resistor is inversely proportional to the square of the current for a given resistance.

Show Answer
Answer: ((a))

Heat produced in a resistor is directly proportional to the square of the current for a given resistance.

44

Which of the following terms is used to describe the pollutants that originate from identifiable sources, such as factories or vehicles?

  1. ((a))

    Non-point Source Pollution

  2. ((b))

    Random Pollution

  3. ((c))

    Point Source Pollution

  4. ((d))

    Radicle Pollution

Show Answer
Answer: ((a))

Non-point Source Pollution

45

How does installing energy-efficient windows in an old building affect energy consumption?

  1. ((a))

    It has no effect on fuel consumption.

  2. ((b))

    It causes indoor temperatures to rise.

  3. ((c))

    It reduces heating and cooling costs in the building.

  4. ((d))

    It increases the need for artificial lighting.

Show Answer
Answer: ((a))

It has no effect on fuel consumption.

46

Which of the following is generally the temperature range in a laboratory thermometer?

  1. ((a))

    -10°C to 110°C

  2. ((b))

    -10°C to 150°C

  3. ((c))

    -100°C to 130°C

  4. ((d))

    35°C to 42°C

Show Answer
Answer: ((a))

-10°C to 110°C

47

A refrigerator seller offers a discount of 10% on its listed price of ₹57,500 and still earns a profit of 15%. The cost price of the refrigerator is:

  1. ((a))

    ₹45,000

  2. ((b))

    ₹42,000

  3. ((c))

    ₹40,000

  4. ((d))

    ₹48,000

Show Answer
Answer: ((a))

₹45,000

48

A person saves 50% of his income. If his expenditure is 440, then his income (in ₹) is:

  1. ((a))

    600

  2. ((b))

    880

  3. ((c))

    920

  4. ((d))

    560

Show Answer
Answer: ((a))

600

49

Which of the following is the correct statement of Ohm's Law?

  1. ((a))

    If the potential difference across the two ends of a conductor is 1 V and the current through it is 1A, then the resistance of the conductor is 20.

  2. ((b))

    The potential difference across the ends of a conductor is inversely proportional to the current flowing through it.

  3. ((c))

    The potential difference across the ends of a conductor is directly proportional to the current flowing through it.

  4. ((d))

    Current through a resistor is directly proportional to its resistance.

Show Answer
Answer: ((a))

If the potential difference across the two ends of a conductor is 1 V and the current through it is 1A, then the resistance of the conductor is 20.

50

A shopkeeper sells sugar at 30 per kg, which he has bought at 24 per kg. Being dishonest, he also gives only y gm of sugar instead of 1000 gm that is mentioned on the weight. In this way, the shopkeeper manages to make an overall profit of 6623\frac{2}{3}%. What is the value of y?

  1. ((a))

    600

  2. ((b))

    720

  3. ((c))

    800

  4. ((d))

    750

Show Answer
Answer: ((a))

600

51

What is the SI unit for solid angle?

  1. ((a))

    Metre

  2. ((b))

    Candela

  3. ((c))

    Radian

  4. ((d))

    Steradian

Show Answer
Answer: ((a))

Metre

52

Eight people are sitting in two parallel rows containing 4 people each in such a way that there is equal distance between adjacent persons. In row 1-A, B, C and D are seated and all of them are facing south. In row 2-P, Q, R and S are seated and all of them are facing north. Thus each person faces another person from the other row. No one sits to the left of B. R faces the person who sits second to the right of D. C faces the person who is the immediate neighbour of Q and R, B does not face S. Who amongst the following faces P?

  1. ((a))

    D

  2. ((b))

    A

  3. ((c))

    B

  4. ((d))

    C

Show Answer
Answer: ((a))

D

53

Study the given graph and answer the question that follows.

<br>

What is the average profit percentage of the given years?

  1. ((a))

    44%

  2. ((b))

    43.4%

  3. ((c))

    44.1%

  4. ((d))

    45%

Show Answer
Answer: ((a))

44%

54

Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at variance with commonly known facts, decide which of the given conclusion(s) logically follow(s) from the statements.

Statements:

I. All books are pencils.

II. All pencils are cardboards.

III. All cardboards are notebooks.

Conclusions:

I. Some notebooks are pencils.

II. Some cardboards are books.

III. Some notebooks are books.

  1. ((a))

    Only conclusions I and II follow.

  2. ((b))

    All conclusions I, II and III follow

  3. ((c))

    Only conclusions I and III follow.

  4. ((d))

    Only conclusions II and III follow.

Show Answer
Answer: ((a))

Only conclusions I and II follow.

55

What type of view is represented of the given machine component?

  1. ((a))

    Oblique view

  2. ((b))

    Orthographic view

  3. ((c))

    Perspective view

  4. ((d))

    Isometric view

Show Answer
Answer: ((a))

Oblique view

56

In order to resolve disputes arising from cyber crime, such as tampering with computer source documents, hacking the computer system, using password of another person and publishing sensitive personal data of others without their consent, a forum has been established by the Central Government (India) in accordance with the provisions contained under Section 48(1) of the Information Technology Act, 2000. What is the name of that forum?

  1. ((a))

    Cyber Appellate Tribunal

  2. ((b))

    National Cybercrime Reporting Station

  3. ((c))

    Cybercrime Reporting Tribunal

  4. ((d))

    Internet Crime Complaint Center

Show Answer
Answer: ((a))

Cyber Appellate Tribunal

57

When reporting a fire in an emergency, what is the most critical information to provide to emergency services?

  1. ((a))

    The weather conditions at the time of the fire

  2. ((b))

    How the fire started and if someone is injured or missing

  3. ((c))

    The likely cause of the fire and the building owner's name

  4. ((d))

    The colour of the smoke and the direction it is moving

Show Answer
Answer: ((a))

The weather conditions at the time of the fire

58

Why does a combination of two thin blankets keep you warmer in the winter than a single thick blanket?

  1. ((a))

    Two thin blankets allow more heat to escape, keeping you warmer.

  2. ((b))

    Two blankets create an additional insulating layer of air, reducing heat loss

  3. ((c))

    Two thin blankets generate more heat than one thick blanket.

  4. ((d))

    Two thin blankets absorb more heat from the surroundings than one thick blanket.

Show Answer
Answer: ((a))

Two thin blankets allow more heat to escape, keeping you warmer.

59

What is necessary for a circuit to have electric current flowing through it?

  1. ((a))

    A closed conducting path with a voltage source

  2. ((b))

    Only wire

  3. ((c))

    Only switch

  4. ((d))

    Only bulb

Show Answer
Answer: ((a))

A closed conducting path with a voltage source

60

Which of the following is NOT correct?

  1. ((a))

    An object moving with a constant velocity represents uniform motion.

  2. ((b))

    The motion of satellite around Earth in a circular orbit is uniform circular motion.

  3. ((c))

    A person jogging in the park is not an example of uniform circular motion.

  4. ((d))

    The distance-time graph of an object moving with uniform speed is not a straight line:

Show Answer
Answer: ((a))

An object moving with a constant velocity represents uniform motion.

61

Among three partners A, B and C in a business. The capital of B is equal to half the difference between thrice the capital of C and twice the capital of A. If at the end of the year, they received a profit of 25,415, what is the share of C (in)?

  1. ((a))

    9,166

  2. ((b))

    8,666

  3. ((c))

    11,666

  4. ((d))

    10,166

Show Answer
Answer: ((a))

9,166

62

E, F, G, H, P, Q, and R, are sitting around a circular table facing the centre. F sits third to the left of H. Only two people sit between H and G when counted from the right of H. Q is an immediate neighbor of G. P is NOT an immediate neighbour of H. E is an Immediate neighbour of Q. Who sits second to the left of E?

  1. ((a))

    H

  2. ((b))

    R

  3. ((c))

    G

  4. ((d))

    P

Show Answer
Answer: ((a))

H

63

The cost of painting a spherical ball at the rate of ₹2.50 per cm² is 13,860. What is the diameter of the ball? (Use π = 22/7)

  1. ((a))

    40 cm

  2. ((b))

    48 cm

  3. ((c))

    21 cm

  4. ((d))

    42 cm

Show Answer
Answer: ((a))

40 cm

64

In an electrical circuit, 'n' number of 10 Ohm resistors are connected in parallel. When one of the resistors is eliminated, the overall resistance of the circuit is __________.

  1. ((a))

    1n2\frac{1}{n^2}

  2. ((b))

    Zero

  3. ((c))

    1n\frac{1}{n}

  4. ((d))

    1(n−1)\frac{1}{(n-1)}

Show Answer
Answer: ((a))

1n2\frac{1}{n^2}

65

What is the ratio of areas between two consecutive format sheet sizes created by halving the length or doubling the width?

  1. ((a))

    2:1

  2. ((b))

    1:4

  3. ((c))

    1:2

  4. ((d))

    4:1

Show Answer
Answer: ((a))

2:1

66

If 'A' stands for '÷', 'B' stands for 'x', 'C' stands for '+' and 'D' stands for '-', then what will come in place of the question mark (?) in the following equation?

47 D 25 A 5C2B9=?

  1. ((a))

    62

  2. ((b))

    60

  3. ((c))

    58

  4. ((d))

    56

Show Answer
Answer: ((a))

62

67

What is the primary purpose of netiquette in online communication?

  1. ((a))

    To ensure polite and respectful interactions

  2. ((b))

    To enhance internet connection speed

  3. ((c))

    To improve typing speed

  4. ((d))

    To increase the number of followers on social media

Show Answer
Answer: ((a))

To ensure polite and respectful interactions

68

The thickness of a thread is measured by a student using a microscope of magnification 100. After making 30 observations, he finds the average width of the thread is 5.7 mm. What is the estimated thickness of the thread?

  1. ((a))

    171 mm

  2. ((b))

    0.057 mm

  3. ((c))

    0.57 mm

  4. ((d))

    0.09 mm

Show Answer
Answer: ((a))

171 mm

69

The interest of (10r)2 in r time at rate r10\frac{r}{10}% is __________.

  1. ((a))

    r410\frac{r^4}{10}

  2. ((b))

    10r410r^4

  3. ((c))

    r420\frac{r^4}{20}

  4. ((d))

    r45\frac{r^4}{5}

Show Answer
Answer: ((a))

r410\frac{r^4}{10}

70

A force of 6 N is exerted on an object, resulting in its displacement of 2 m in the direction of the force. If the force is constant during the displacement, what is the work done in this case?

  1. ((a))

    25 J

  2. ((b))

    12 J

  3. ((c))

    3 J

  4. ((d))

    10 J

Show Answer
Answer: ((a))

25 J

71

If 21.6: x:: x: 29.4, and x > 0 then find the value of x.

  1. ((a))

    23.9

  2. ((b))

    23.3

  3. ((c))

    25.4

  4. ((d))

    25.2

Show Answer
Answer: ((a))

23.9

72

Which of the following statements is NOT true?

  1. ((a))

    Clinical thermometer should not be used to measure the temperature of boiling water.

  2. ((b))

    Clinical and laboratory thermometers are the same.

  3. ((c))

    The range of clinical thermometer is 35 to 42°C.

  4. ((d))

    Laboratory thermometer cannot be used to measure body temperature.

Show Answer
Answer: ((a))

Clinical thermometer should not be used to measure the temperature of boiling water.

73

Which of the following options is NOT a necessary characteristic of a kite?

  1. ((a))

    At least one diagonal is bisected by the other diagonal.

  2. ((b))

    The diagonals are perpendicular to each other.

  3. ((c))

    The pairs of opposite angles are bisected by the corresponding diagonals.

  4. ((d))

    At least one pair of opposite angles is congruent.

Show Answer
Answer: ((a))

At least one diagonal is bisected by the other diagonal.

74

A porter lifts a 10 kg luggage from the ground and places it on his head, 2.5 m above the ground. Calculate the work done by him on the luggage. (Take g = 10m s- 2)

  1. ((a))

    200 J

  2. ((b))

    100 J

  3. ((c))

    250 J

  4. ((d))

    250 N

Show Answer
Answer: ((a))

200 J

75

What should come in place of the question mark (?) in the given series?

179 171 163? 147 139

  1. ((a))

    155

  2. ((b))

    157

  3. ((c))

    151

  4. ((d))

    153

Show Answer
Answer: ((a))

155

76

If x + y + z = 0 then find the value of x22yz+y22xz+z22xy\frac{x^2}{2yz} + \frac{y^2}{2xz} + \frac{z^2}{2xy}

  1. ((a))

    25\frac{2}{5}

  2. ((b))

    32\frac{3}{2}

  3. ((c))

    35\frac{3}{5}

  4. ((d))

    23\frac{2}{3}

Show Answer
Answer: ((a))

25\frac{2}{5}

77

In a certain code language, 'WIDE' is coded as '8694' and 'INKS' is coded as '3917', 7 What is the code for 'I' in the given code language?

  1. ((a))

    8

  2. ((b))

    3

  3. ((c))

    7

  4. ((d))

    9

Show Answer
Answer: ((a))

8

78

A shopkeeper allows a discount of 18% on the marked price of an article and sells it for 2,870. Find the marked price of the article.

  1. ((a))

    ₹3,200

  2. ((b))

    ₹3,350

  3. ((c))

    ₹3,460

  4. ((d))

    ₹3,500

Show Answer
Answer: ((a))

₹3,200

79

Which is the least number that must be subtracted from 5563 to make it exactly divisible by 18?

  1. ((a))

    5

  2. ((b))

    7

  3. ((c))

    3

  4. ((d))

    1

Show Answer
Answer: ((a))

5

80

Study the given table carefully and answer the question that follows.

Number of students who
Appeared for the examPassed the exam
Class IX10489
Class X6347

What was the total number of students who failed the exam from classes IX and X?

  1. ((a))

    21

  2. ((b))

    31

  3. ((c))

    28

  4. ((d))

    33

Show Answer
Answer: ((a))

21

81

Based on the English alphabetical order, three of the following four letter-cluster pairs are alike in a certain way and thus form a group. Which letter-cluster pair DOES NOT belong to that group?

(Note: The odd one out is not based on the number of consonants/vowels or their position in the letter-cluster pair)

  1. ((a))

    QL-NT

  2. ((b))

    BW-YE

  3. ((c))

    KF-HM

  4. ((d))

    DY-AG

Show Answer
Answer: ((a))

QL-NT

82

Identify the orthographic symbol of a pipe fitting shown in the figure.

  1. ((a))

    Tee

  2. ((b))

    Cross

  3. ((c))

    Union

  4. ((d))

    Bend

Show Answer
Answer: ((a))

Tee

83

Read the given statement and conclusions carefully. Assume that the information given in the statement is true, even if it appears to be at variance with commonly known facts, and decide which of the given conclusion(s) logically follow(s) from the statement.

Statement:

Over the past year, respiratory illnesses have increased significantly in city W. According to a public health study, this increase is linked to the increase in the number of cars, which raises air pollution levels on the roads.

Conclusions:

I. Increased vehicular traffic contributes to higher levels of air pollution.

II. Improving public transportation will reduce respiratory illnesses in city W.

  1. ((a))

    Both conclusions I and II follow.

  2. ((b))

    Neither conclusion I nor II follows.

  3. ((c))

    Only conclusion II follows.

  4. ((d))

    Only conclusion 1 follows.

Show Answer
Answer: ((a))

Both conclusions I and II follow.

84

An object’s potential energy is equal to ________.

  1. ((a))

    Change in velocity

  2. ((b))

    Change in acceleration

  3. ((c))

    Transfer of energy

  4. ((d))

    Loss of energy

Show Answer
Answer: ((a))

Change in velocity

85

Which of the following is the primary reason for adopting scientifically designed methods for safely disposing of toxic waste from automobiles?

  1. ((a))

    To improve vehicle lifespan by minimising mechanical wear

  2. ((b))

    To increase vehicle performance by optimising engine efficiency

  3. ((c))

    To reduce fuel consumption and improve overall efficiency

  4. ((d))

    To protect human health from harmful fumes and dust in the air

Show Answer
Answer: ((a))

To improve vehicle lifespan by minimising mechanical wear

86

Given below are two sets of numbers. Both the sets are formed using the same mathematical equations or follow a common pattern. Which of the given options follows the same set of mathematical equations or patterns as the sets given in the question?

4-9-25-64-169; 16-49-121-324-841

  1. ((a))

    64 - 100 - 144 - 196 - 256

  2. ((b))

    16 - 36 - 64 - 100 - 144

  3. ((c))

    4 - 16 - 36 - 64 - 100

  4. ((d))

    64-225-529-1444-3721

Show Answer
Answer: ((a))

64 - 100 - 144 - 196 - 256

87

Examine the symbolic representation of the hole and rivet provided below. According to BIS SP 46-2003, what does this symbol represent?

  1. ((a))

    Drilled in the workshop

  2. ((b))

    Fitted in the workshop

  3. ((c))

    Drilled and fitted on-site

  4. ((d))

    Drilled on-site

Show Answer
Answer: ((a))

Drilled in the workshop

88

The ABC Association meeting will be held on the 2nd Sunday of next month. The registration fee is ₹50 per person. Participants will be provided meals at an additional cost of ₹24. If the number of people who paid for meals is 100 more than those who did not pay for meals, and the total amount collected from registrations and meals is ₹69,400, then how many people registered and how many meals should be prepared?

  1. ((a))

    1100 and 1100

  2. ((b))

    1100 and 600

  3. ((c))

    1100 and 50

  4. ((d))

    500 and 600

Show Answer
Answer: ((a))

1100 and 1100

89

What should come in place of the question mark (?) in the given series?

62 73 87 104 124 ?

  1. ((a))

    142

  2. ((b))

    147

  3. ((c))

    134

  4. ((d))

    153

Show Answer
Answer: ((a))

142

90

What should come in place of the question mark (?) in the given alpha-numeric series?

Q16, O14, M12, K10, I8, ?

  1. ((a))

    G4

  2. ((b))

    H6

  3. ((c))

    G6

  4. ((d))

    J6

Show Answer
Answer: ((a))

G4

91

Which element is used in thermometers?

  1. ((a))

    Bromine

  2. ((b))

    Mercury

  3. ((c))

    Gallium

  4. ((d))

    Lead

Show Answer
Answer: ((a))

Bromine

92

Two trains are running in opposite directions at the same speed. The length of each train is 175 m. If they cross each other in 7 s, the speed of each train is:

  1. ((a))

    75 km/hr

  2. ((b))

    90 km/hr

  3. ((c))

    85 km/hr

  4. ((d))

    80 km/hr

Show Answer
Answer: ((a))

75 km/hr

93

If the length, the breadth, and the height of a cuboid are 5 m, 2 m, and 50 cm, respectively, then find its volume.

  1. ((a))

    500 m³

  2. ((b))

    20 m³

  3. ((c))

    50m³

  4. ((d))

    5 m³

Show Answer
Answer: ((a))

500 m³

94

If an electric load draws a current of 2 A for 1 second, then calculate the number of electrons (with charge 1.6 × 10-19 °c ) passing through the load.

  1. ((a))

    1.25x10 20

  2. ((b))

    0.25 x 1019

  3. ((c))

    0.25 x 1020

  4. ((d))

    1.25 x1019

Show Answer
Answer: ((a))

1.25x10 20

95

An electric heater of resistance 50 uses a current of 3 A. Determine the heat generated in 20 seconds.

  1. ((a))

    5000 J

  2. ((b))

    1000 J

  3. ((c))

    9000 J

  4. ((d))

    60 J

Show Answer
Answer: ((a))

5000 J

96

Which of the following keyboard shortcuts on a Windows 10 home screen opens the item's properties?

  1. ((a))

    Insert + Alt

  2. ((b))

    F2 + Alt

  3. ((c))

    Tab + Del

  4. ((d))

    Alt + Enter

Show Answer
Answer: ((a))

Insert + Alt

97

Which of the following is NOT a good heat conductor?

  1. ((a))

    Fur

  2. ((b))

    Copper

  3. ((c))

    Iron

  4. ((d))

    Aluminum

Show Answer
Answer: ((a))

Fur

98

A, B, C, D, E, and F live on six different floors of the same building. The lowest floor of the building is numbered 1, the floor above it is numbered 2, and the top floor is numbered 6. E lives on an even-numbered floor but not on floor 4. The sum of the floor numbers where E and B live is 9. Only three people live between A and C. The sum of the floor numbers where F and C live is 3. What is the sum of the floor numbers where B and F live?

  1. ((a))

    6

  2. ((b))

    4

  3. ((c))

    7

  4. ((d))

    5

Show Answer
Answer: ((a))

6

99

Under which Section of the Factories Act, of 1948, is the employment of women and children near cotton openers prohibited?

  1. ((a))

    Section 25

  2. ((b))

    Section 21

  3. ((c))

    Section 27

  4. ((d))

    Section 29

Show Answer
Answer: ((a))

Section 25

100

Four chairs and a table set up cost 22,000. Determine the table's cost, if it is ₹2,000 more expensive than the chair.

  1. ((a))

    ₹6,000

  2. ((b))

    ₹5,000

  3. ((c))

    ₹4,000

  4. ((d))

    ₹6,500

Show Answer
Answer: ((a))

₹6,000

Part B (75 questions)

101

During which of the following processes of the working of a bus AC system does the cool liquid through the expansion valve become gas and the gaseous refrigerant absorb a lot of heat energy?

  1. ((a))

    Throttling

  2. ((b))

    Evaporation

  3. ((c))

    Compression

  4. ((d))

    Condensation

Show Answer
Answer: ((a))

Throttling

102

Which of the following parts of a vapour compression system allows the liquid refrigerant under high pressure and temperature to pass at a controlled rate after reducing its pressure and temperature?

  1. ((a))

    Evaporator 

  2. ((b))

    Receiver 

  3. ((c))

    Condenser 

  4. ((d))

    Expansion valve 

Show Answer
Answer: ((a))

Evaporator 

103

For a given subcooling in °C, the increase in refrigeration effect is ____________. 

  1. ((a))

    proportional to the specific heat of the liquid

  2. ((b))

    proportional to the entropy of the liquid

  3. ((c))

    proportional to the irreversibility of the liquid

  4. ((d))

    inversely proportional to the specific heat of the liquid

Show Answer
Answer: ((a))

proportional to the specific heat of the liquid

104

Which of the following electrical components is NOT used by hydrocarbon appliances? 

  1. ((a))

    The overload protector is sealed bimetal.

  2. ((b))

    ON/OFF and door switches should be of non-sealed type.

  3. ((c))

    The thermostat is either located in a sealed electrical box or a solid state. 

  4. ((d))

    The compressor relay is in solid state.

Show Answer
Answer: ((a))

The overload protector is sealed bimetal.

105

If the length of a resistor is doubled, what happens to its resistance, assuming all other factors remain constant? 

  1. ((a))

    The resistance remains the same.

  2. ((b))

    The resistance quadruples. 

  3. ((c))

    The resistance is halved. 

  4. ((d))

    The resistance is doubled. 

Show Answer
Answer: ((a))

The resistance remains the same.

106

In which of the following components of ice cube machine, is the water frozen in tubes, extended vertically within a surrounding casing? 

  1. ((a))

    Tube ice generator

  2. ((b))

    Capillary tube 

  3. ((c))

    Compressor 

  4. ((d))

    Condenser

Show Answer
Answer: ((a))

Tube ice generator

107

_____ type of controllers have semiconductor sensors in Air conditioning system. 

  1. ((a))

    Electronic 

  2. ((b))

    Electric 

  3. ((c))

    Pneumatic 

  4. ((d))

    Hydraulic 

Show Answer
Answer: ((a))

Electronic 

108

In a logic circuit, two inputs A and B are applied to an AND gate, and the output of the AND gate is connected to the input of a NOT gate. If the inputs A and B are both at logic 0, what will be the output of the entire circuit? 

  1. ((a))

    Undefined 

  2. ((b))

    2

  3. ((c))

    1

  4. ((d))

    0

Show Answer
Answer: ((a))

Undefined 

109

The wave set of hacksaw teeth set has a pitch of ________________. 

  1. ((a))

    0.8 mm

  2. ((b))

    0.5 mm

  3. ((c))

    2.0 mm

  4. ((d))

    1.0 mm

Show Answer
Answer: ((a))

0.8 mm

110

What is the SI unit of 'volume'? 

  1. ((a))

    Millilitres 

  2. ((b))

    Cubic metre 

  3. ((c))

    Litres 

  4. ((d))

    Cubic centimetre

Show Answer
Answer: ((a))

Millilitres 

111

The _____________ part in a frost-free refrigerator provides pumping action to the refrigerant. 

  1. ((a))

    condenser

  2. ((b))

    capillary tube

  3. ((c))

    receiver 

  4. ((d))

    compressor

Show Answer
Answer: ((a))

condenser

112

Match the following types of lines with their correct descriptions according to their orientation and characteristics. 

DescriptionType of Line
A. A line that is neither parallel to a horizontal plane nor perpendicular to it.1. Horizontal Line
B. A line that is perpendicular to horizontal lines.2. Vertical Line
C. A line that changes its direction continuously.3. Inclined Line
D. A line that is parallel to a horizontal plane.4. Curved Line
  1. ((a))

    A - 2, B - 3, C - 4, D - 1

  2. ((b))

    A - 1, B - 2, C - 3, D - 4

  3. ((c))

    A - 2, B - 1, C - 4, D - 3 

  4. ((d))

    A - 3, B - 2, C - 4, D - 1 

Show Answer
Answer: ((a))

A - 2, B - 3, C - 4, D - 1

113

In air conditioning systems, screw chiller uses _____ compression process. 

  1. ((a))

    helical rotors 

  2. ((b))

    rotating impeller 

  3. ((c))

    zigzag rotors 

  4. ((d))

    spiral rotors 

Show Answer
Answer: ((a))

helical rotors 

114

Which of the following terms in the 5S concept refers to making a habit of maintaining the established procedures? 

  1. ((a))

    Sort 

  2. ((b))

    Shine 

  3. ((c))

    Sustain 

  4. ((d))

    Set

Show Answer
Answer: ((a))

Sort 

115

Who is authorised to conduct road tests on workshop vehicles? 

  1. ((a))

    Any employee

  2. ((b))

    The company accountant 

  3. ((c))

    Visitors to the workshop

  4. ((d))

    Only trained and certified personnel

Show Answer
Answer: ((a))

Any employee

116

Which of the following remote controllers in split AC quickly maximises the cooling effect in any operation mode? 

  1. ((a))

    Timer cancel 

  2. ((b))

    Mode selector button

  3. ((c))

    Swing 

  4. ((d))

    Powerful operation

Show Answer
Answer: ((a))

Timer cancel 

117

Which of the following ‘V’ blocks will have one ‘V’ groove and two grooves (slots) on either side for clamping in two positions?

  1. ((a))

    Single level double groove ‘V’ block

  2. ((b))

    Matched pair ‘V’ block 

  3. ((c))

    Double level single groove ‘V’ block

  4. ((d))

    Single level single groove ‘V’ block 

Show Answer
Answer: ((a))

Single level double groove ‘V’ block

118

The automac expansion valve is a _____ reducing device in a refrigeraon system. 

  1. ((a))

    temperature 

  2. ((b))

    pressure 

  3. ((c))

    density 

  4. ((d))

    volume

Show Answer
Answer: ((a))

temperature 

119

Which of the following regarding ventilation inspection and commissioning is INCORRECT?

  1. ((a))

    A well-balanced ventilation system cannot help optimise energy usage by preventing unnecessary over-ventilation

  2. ((b))

    Proper ventilation is crucial for maintaining good indoor air quality 

  3. ((c))

    Testing the functionality of automated controls that regulate the ventilation system, such as sensors and actuators

  4. ((d))

    Many building codes and standards require regular ventilation system checks to ensure compliance

Show Answer
Answer: ((a))

A well-balanced ventilation system cannot help optimise energy usage by preventing unnecessary over-ventilation

120

A machine working on a Carnot cycle operates between 305 K and 260 K. What will be the COP when it is operated as a refrigerating machine? 

  1. ((a))

    3.84

  2. ((b))

    2.67

  3. ((c))

    4.25

  4. ((d))

    5.78 

Show Answer
Answer: ((a))

3.84

121

In a series circuit, three resistors of 10 ohms, 20 ohms, and R ohms are connected in series with a 12 V battery. What is the value of resistance R if current flowing in the circuit is 0.2 A? 

  1. ((a))

    40 ohms

  2. ((b))

    10 ohms

  3. ((c))

    20 ohms

  4. ((d))

    30 ohms

Show Answer
Answer: ((a))

40 ohms

122

Which of the following applicaons of a vapour compression system is a type of refrigerated cabinet that displays merchandise as well as cools it? 

  1. ((a))

    Deep freezer

  2. ((b))

    Water cooler

  3. ((c))

    Visible cooler 

  4. ((d))

    Bole cooler

Show Answer
Answer: ((a))

Deep freezer

123

Which of the following units of a train AC consists of pressure gauges and pressure cutouts to protect the compressor against high pressure?

  1. ((a))

    Compressor 

  2. ((b))

    Evaporator unit

  3. ((c))

    Gauge board 

  4. ((d))

    Condenser 

Show Answer
Answer: ((a))

Compressor 

124

Which of the following expansion valves functions to maintain a constant pressure in the evaporator? 

  1. ((a))

    Level master control 

  2. ((b))

    Electronic expansion valve

  3. ((c))

    Automatic expansion valve 

  4. ((d))

    Thermostatic expansion valve

Show Answer
Answer: ((a))

Level master control 

125

What is the typical temperature range of a mercury-based clinical thermometer?

  1. ((a))

    0°C to 100°C 

  2. ((b))

    35°C to 42°C 

  3. ((c))

    0°C to 50°C

  4. ((d))

    −10°C to 110°C 

Show Answer
Answer: ((a))

0°C to 100°C 

126

Which type of line is used to represent hidden edges or surfaces in a technical drawing, as per BIS SP 46-2003? 

  1. ((a))

    Chain thin line

  2. ((b))

    Continuous thin line

  3. ((c))

    Dashed thin line 

  4. ((d))

    Continuous thick line 

Show Answer
Answer: ((a))

Chain thin line

127

The SI Unit of heat is _____. 

  1. ((a))

    Joule 

  2. ((b))

    Ohm 

  3. ((c))

    Watt 

  4. ((d))

    kilogram

Show Answer
Answer: ((a))

Joule 

128

For your safety at work, which of the following should be ensured?

  1. All the required protective clothing and equipment are used.
  2. Training and instruction necessary for performing tasks safely have been received.
  1. ((a))

    Only statement 1

  2. ((b))

    Both statement 1 and 2

  3. ((c))

    Only statement 2

  4. ((d))

    Neither statement 1 nor 2

Show Answer
Answer: ((a))

Only statement 1

129

The pencil type double mouth filter drier, used in the refrigerator is made of _________. 

  1. ((a))

    copper 

  2. ((b))

    brass 

  3. ((c))

    titanium 

  4. ((d))

    silicon 

Show Answer
Answer: ((a))

copper 

130

________________ controllers uses compressed air to control Central Industrial Air Conditioning Systems. 

  1. ((a))

    Hydraulic 

  2. ((b))

    Robotic 

  3. ((c))

    Pneumatic 

  4. ((d))

    Automated

Show Answer
Answer: ((a))

Hydraulic 

131

In the process of bisecting angle BAC in the given figure, why do we draw arcs from points D and E?

  1. ((a))

    To intersect line AC 

  2. ((b))

    To intersect above A 

  3. ((c))

    To mark equal lengths 

  4. ((d))

    To find midpoint AB

Show Answer
Answer: ((a))

To intersect line AC 

132

The temperature at which air becomes saturated with water vapour is called: 

  1. ((a))

    wet bulb temperature

  2. ((b))

    dry bulb temperature

  3. ((c))

    wet bulb depression 

  4. ((d))

    dew point temperature 

Show Answer
Answer: ((a))

wet bulb temperature

133

In refrigeration and air conditioning systems, manual valves regulate the flow of ______ throughout the piping system. 

  1. ((a))

    milk 

  2. ((b))

    nitrogen 

  3. ((c))

    refrigerant 

  4. ((d))

    air 

Show Answer
Answer: ((a))

milk 

134

Which of the following components of a walk-in cooler is used to mount condensing unit assembly? 

  1. ((a))

    Condensate water evaporator

  2. ((b))

    Drain line heater

  3. ((c))

    Heat exchanger

  4. ((d))

    Condenser unit rack

Show Answer
Answer: ((a))

Condensate water evaporator

135

Which of the following metals has the lowest melting point? 

  1. ((a))

    Mercury 

  2. ((b))

    Lead 

  3. ((c))

    Iron 

  4. ((d))

    Gold

Show Answer
Answer: ((a))

Mercury 

136

HVAC system selection does NOT depend on the ________. 

  1. ((a))

    climate condition 

  2. ((b))

    owner's desire 

  3. ((c))

    number of tubes

  4. ((d))

    building configuration 

Show Answer
Answer: ((a))

climate condition 

137

Removal of moisture from the air, without change in its dry bulb temperature (DBT), is called ______. 

  1. ((a))

    latent heat 

  2. ((b))

    humidification 

  3. ((c))

    sensible heat

  4. ((d))

    dehumidification

Show Answer
Answer: ((a))

latent heat 

138

Which of the following statements is NOT correct for using scribers? 

  1. ((a))

    Place a cork on the point when in use to prevent accidents.

  2. ((b))

    While scribing lines, the scriber is used like a pencil.

  3. ((c))

    Scriber points are very sharp, so they are to be handled very carefully

  4. ((d))

    Do not put the scriber in your pocket. 

Show Answer
Answer: ((a))

Place a cork on the point when in use to prevent accidents.

139

The SI unit of temperature is/are _____. 

  1. ((a))

    both kelvin and celsius

  2. ((b))

    fahrenheit 

  3. ((c))

    celsius 

  4. ((d))

    kelvin 

Show Answer
Answer: ((a))

both kelvin and celsius

140

Which of the following statements is INCORRECT about end standard? 

  1. ((a))

    It measures the distance between two parallel flat surfaces.

  2. ((b))

    It is slower but more accurate.

  3. ((c))

    Faces are subject to wear.

  4. ((d))

    It is used to measure the distance between two engraved lines

Show Answer
Answer: ((a))

It measures the distance between two parallel flat surfaces.

141

Identify the part labelled with a question mark (?) from the skeleton of conventional household refrigerator.

  1. ((a))

    Turbine

  2. ((b))

    Cooling coil 

  3. ((c))

    Steam engine 

  4. ((d))

    Heating coil

Show Answer
Answer: ((a))

Turbine

142

Which of the following calipers are used for marking lines, parallel to inside and outside edges and for locating the centre of round bars? 

  1. ((a))

    Firm joint calipers 

  2. ((b))

    Spring joint calipers 

  3. ((c))

    Simple calipers

  4. ((d))

    Leg and point calipers 

Show Answer
Answer: ((a))

Firm joint calipers 

143

Which of the following remote controllers in split AC is used to start or stop the fast cooling?  

  1. ((a))

    Turbo button

  2. ((b))

    Power saver button

  3. ((c))

    Timer off button

  4. ((d))

    Timer on button

Show Answer
Answer: ((a))

Turbo button

144

In an air-conditioning system, control systems are used to ______. 

  1. ((a))

    connect to heat exchange surfaces 

  2. ((b))

    regulate automatically the amount of cooling or warming

  3. ((c))

    direct the air to the room through the outlets

  4. ((d))

    clean air, either fresh, recirculated or both

Show Answer
Answer: ((a))

connect to heat exchange surfaces 

145

Which of the following parts of VRF or VRV system is used to return oil from the oil separator to the compressor? 

  1. ((a))

    Solenoid valve

  2. ((b))

    High pressure sensor

  3. ((c))

    Four-way valve

  4. ((d))

    Electronic expansion valve

Show Answer
Answer: ((a))

Solenoid valve

146

A voltmeter with a resistance of 10,000 ohms is connected across a circuit that has a voltage of 50 V. What is the current flowing through the voltmeter? 

  1. ((a))

    1 mA

  2. ((b))

    5  mA

  3. ((c))

    2 mA

  4. ((d))

    4 mA

Show Answer
Answer: ((a))

1 mA

147

It is always desirable to sub cool the liquid refrigerant before the ________. 

  1. ((a))

    condenser 

  2. ((b))

    expansion valve 

  3. ((c))

    evaporator 

  4. ((d))

    compressor

Show Answer
Answer: ((a))

condenser 

148

What is the function of ducts in Central Industrial Air Conditioning System? 

  1. ((a))

    Located in the liquid line to prevent moisture and dust particles in Air Conditioning System

  2. ((b))

    Collect liquid refrigerant coming from condenser and supply to the expansion valve

  3. ((c))

    Used to carry air from one place to another place

  4. ((d))

    Reducing the pressure and amount of liquid refrigerant into the evaporator 

Show Answer
Answer: ((a))

Located in the liquid line to prevent moisture and dust particles in Air Conditioning System

149

Which of the following types of chisels is used for separating metals after chain drilling? 

  1. ((a))

    Web chisel

  2. ((b))

    Diamond point chisel

  3. ((c))

    Cross-cut chisel

  4. ((d))

    Flat chisel

Show Answer
Answer: ((a))

Web chisel

150

Match the given halocarbon refrigerants with their correct refrigerant numbers.

Chemical namesRefrigerant numbers
A. Methyl chlorideP. R-14
B. DichlorodifluoromethaneQ. R-13
C. MonochlorotrifluoromethaneR. R-12
D. Carbon tetrafluorideS. R-40
  1. ((a))

    A-S, B-R, C-P, D-Q 

  2. ((b))

    A-R, B-S, C-Q, D-P

  3. ((c))

    A-S, B-Q, C-R, D-P

  4. ((d))

    A-S, B-R, C-Q, D-P 

Show Answer
Answer: ((a))

A-S, B-R, C-P, D-Q 

151

Idenfy the correct statement(s) regarding the Industrial Air-Condioning System.

Statement 1: Three-way valves are tradionally used in constant-flow pumping systems.

Statement 2: In three-way valves, unused water is bypassed at the coil.

  1. ((a))

    Only Statement 2 is correct. 

  2. ((b))

    Both Statement 1 and Statement 2 are incorrect. 

  3. ((c))

    Both Statement 1 and Statement 2 are correct. 

  4. ((d))

    Only Statement 1 is correct.

Show Answer
Answer: ((a))

Only Statement 2 is correct. 

152

What is the function of Air flapper or Louver in refrigeration systems?

  1. ((a))

    Lowering the pressure of the refrigerant from high to low

  2. ((b))

    Increasing the pressure and temperature of the refrigerant gas

  3. ((c))

    Controlling the influx of cold air into a refrigerating chamber

  4. ((d))

    Cooling the refrigerant gas, changing it to a liquid

Show Answer
Answer: ((a))

Lowering the pressure of the refrigerant from high to low

153

Which of the following properties of lubricant oils is a measure of the resistance that the oil offers to the flow of electric current? 

  1. ((a))

    Cloud point 

  2. ((b))

    Viscosity

  3. ((c))

    Chemical stability 

  4. ((d))

    Dielectric strength

Show Answer
Answer: ((a))

Cloud point 

154

Which of the following colours is commonly used for caution signs? 

  1. ((a))

    Yellow

  2. ((b))

    Red

  3. ((c))

    Green

  4. ((d))

    Blue

Show Answer
Answer: ((a))

Yellow

155

Which of the following types of control is NOT used in air-conditioning system?

  1. ((a))

    Hydraulic

  2. ((b))

    Electronics

  3. ((c))

    Pneumatic

  4. ((d))

    Electric

Show Answer
Answer: ((a))

Hydraulic

156

Refrigeration controls are the refrigeration tools used to control the _______.

  1. ((a))

    flow of refrigerant at various points throughout the refrigeration cycle

  2. ((b))

    temperature of refrigerant at various points throughout the refrigeration cycle

  3. ((c))

     heat of refrigerant at various points throughout the refrigeration cycle 

  4. ((d))

    pressure of refrigerant at various points throughout the refrigeration cycle 

Show Answer
Answer: ((a))

flow of refrigerant at various points throughout the refrigeration cycle

157

When passing stationary vehicles, keep a watch on ___________ who may come out suddenly from the front of the stationary vehicle. While overtaking, it should be done on the __________ side. Always keep a good _________________ between your vehicle and others. 

  1. ((a))

    pedestrians; right; distance 

  2. ((b))

    cyclists; left; interval 

  3. ((c))

    drivers; left; space

  4. ((d))

    vehicles; right; gap 

Show Answer
Answer: ((a))

pedestrians; right; distance 

158

The latent heat of fusion of ice is _____ kJ/kg.

  1. ((a))

    436

  2. ((b))

    336

  3. ((c))

    536

  4. ((d))

    236

Show Answer
Answer: ((a))

436

159

What is the minimum age for employment in factories or mines or other hazardous employment, according to Article 24 of the Indian Constitution?

  1. ((a))

    14 years

  2. ((b))

    12 years 

  3. ((c))

    18 years

  4. ((d))

    16 years 

Show Answer
Answer: ((a))

14 years

160

Which of the following statements about title block is/are true?

Statement 1: The title block is situated in the bottom right-hand corner of the drawing sheet.

Statement 2: The contents of the title block are standardised and cannot be modified to suit individual company needs.

  1. ((a))

    Both statements are true 

  2. ((b))

    Both statements are false 

  3. ((c))

    Statement 1 is true, but statement 2 is false 

  4. ((d))

    Statement 1 is false, but statement 2 is true

Show Answer
Answer: ((a))

Both statements are true 

161

What is the effect of scaling in a water cooled condenser? 

  1. ((a))

    Scale coating provides necessary pumping action to the refrigerant.  

  2. ((b))

     Scale coating increases the heat transfer from the hot gas to the water.

  3. ((c))

    Scale coating prevents the heat transfer from the hot gas to the water.

  4. ((d))

    Scale coating acts as a reservoir for excess liquid refrigeration. 

Show Answer
Answer: ((a))

Scale coating provides necessary pumping action to the refrigerant.  

162

When creating 10 mm single-stroke capital letters in vertical style, what does the 10 mm distance between horizontal parallel lines represent?

  1. ((a))

    Letter width 

  2. ((b))

    Interline spacing 

  3. ((c))

     Letter height  

  4. ((d))

    Stroke thickness

Show Answer
Answer: ((a))

Letter width 

163

In a refrigeration system, _____ equipment is used for measuring the dry bulb and wet bulb temperature simultaneously. 

  1. ((a))

    manometer

  2. ((b))

    barometer

  3. ((c))

    psychrometer

  4. ((d))

    orificemeter

Show Answer
Answer: ((a))

manometer

164

Find the lateral surface area of a cube with side length 5 cm. 

  1. ((a))

    150 cm²

  2. ((b))

    200 cm²

  3. ((c))

    125 cm²

  4. ((d))

    100 cm²

Show Answer
Answer: ((a))

150 cm²

165

Which of the following chemicals is NOT added to ordinary water for making brine solution?

  1. ((a))

    Ethylene glycol  

  2. ((b))

    Hydrochloric acid

  3. ((c))

    Propylene glycol 

  4. ((d))

    Sodium chloride 

Show Answer
Answer: ((a))

Ethylene glycol  

166

 6 A 100-mm prick punch with a 7-mm diameter body could have a 2.5-mm diameter point ground to an angle of __________. 

  1. ((a))

    90°

  2. ((b))

    30°

  3. ((c))

    45°

  4. ((d))

    120°

Show Answer
Answer: ((a))

90°

167

Convert 8.5% into a decimal. 

  1. ((a))

    85

  2. ((b))

    0.85

  3. ((c))

    0.085

  4. ((d))

    8.5

Show Answer
Answer: ((a))

85

168

Vertical type bottle coolers employ _________ convection of air inside storage cooling compartment. 

  1. ((a))

    gravitational

  2. ((b))

    buoyant

  3. ((c))

    forced

  4. ((d))

    natural

Show Answer
Answer: ((a))

gravitational

169

In the case of ammonia, the power consumpon per ton refrigeraon with wet compression as compared with that of dry compression is _____. 

  1. ((a))

    20% more

  2. ((b))

    10% less

  3. ((c))

    20% less 

  4. ((d))

    10% more

Show Answer
Answer: ((a))

20% more

170

Which of the following information is necessary to construct a rectangle? 

  1. ((a))

    Length of two adjacent sides

  2. ((b))

    Only the length of one side

  3. ((c))

    Only the length of the diagonal 

  4. ((d))

    Length of one side and the area of the rectangle 

Show Answer
Answer: ((a))

Length of two adjacent sides

171

Isobutane (R-600a) is never used for ______________ of existing CFC-12 or HFC-134 a systems. 

  1. ((a))

    heating

  2. ((b))

    cooling

  3. ((c))

    expansion

  4. ((d))

    conversion/retrofitting 

Show Answer
Answer: ((a))

heating

172

Squirrel cage induction motor is __________ phase induction motor.

  1. ((a))

    a single

  2. ((b))

    a three

  3. ((c))

    a two 

  4. ((d))

    not a

Show Answer
Answer: ((a))

a single

173

Which of the following care and maintenance of car air-conditioning is INCORRECT? 

  1. ((a))

    Vacuum the filter if it is dirty from driving in dusty or polluted areas.  

  2. ((b))

    Replace the cabin air filter regularly to prevent dust and pollen from clogging the system. 

  3. ((c))

    Perform electrical repairs to resolve issues with the electrical components of the AC unit

  4. ((d))

    Do not replace the evaporator coil to prevent ice formation.

Show Answer
Answer: ((a))

Vacuum the filter if it is dirty from driving in dusty or polluted areas.  

174

In which of the following unitary air conditioners, are all components in one unit, like a rooftop package unit?

  1. ((a))

    Window air conditioners

  2. ((b))

    Central air conditioners 

  3. ((c))

     Ducted split systems 

  4. ((d))

    Ductless systems

Show Answer
Answer: ((a))

Window air conditioners

175

Which of the following is the primary reason why copper is widely used as a conductor in electrical wiring?

  1. ((a))

    Copper is abundant and inexpensive. 

  2. ((b))

    Copper has low resistance and high conductivity.

  3. ((c))

    Copper has a low melting point.

  4. ((d))

    Copper has high resistance to electricity. 

Show Answer
Answer: ((a))

Copper is abundant and inexpensive. 

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