Official Paper

RRB JE CBT 2 (Electronics and Allied Engineering) Official Paper (Held On: 2 Jul, 2026) (Previous Year Paper)

150 questions · 120 minutes · with answers · free

Attempt as Timed Mock Test

General Abilities (50 questions)

1

Which condition is required for a displacement reaction between a metal and salt solution?

  1. ((a))

    Metal must be same as salt constituent

  2. ((b))

    Metal must be higher in reactivity series

  3. ((c))

    Reaction must be endothermic

  4. ((d))

    Salt must be insoluble in water

Show Answer
Answer: ((a))

Metal must be same as salt constituent

2

According to the Article 75 of the Indian Constitution, the total number of ministers (including the Prime Minister) in the Council of Ministers shall NOT exceed what percentage of the total members of the House of the People, i.e., Lok Sabha?

  1. ((a))

    25%

  2. ((b))

    20%

  3. ((c))

    15%

  4. ((d))

    10%

Show Answer
Answer: ((a))

25%

3

A construction worker needs to lift a heavy metal beam using a lever but has a limited length of plank. Which adjustment would allow the worker to lift the beam with the least effort if the position of the fulcrum can be changed but the plank length remains constant?

  1. ((a))

    Keep the fulcrum fixed at any point

  2. ((b))

    Move the fulcrum closer to the beam

  3. ((c))

    Place the fulcrum at the center of the plank

  4. ((d))

    Move the fulcrum closer to the worker

Show Answer
Answer: ((a))

Keep the fulcrum fixed at any point

4

What file extension is used to save an MS PowerPoint 2021 presentation?

  1. ((a))

    .docx

  2. ((b))

    .xlsx

  3. ((c))

    .pdf

  4. ((d))

    .pptx

Show Answer
Answer: ((a))

.docx

5

According to Thomson’s model, how are electrons arranged in an atom?

  1. ((a))

    Randomly placed inside the nucleus

  2. ((b))

    Orbiting around neutrons in elliptical paths

  3. ((c))

    Embedded in a positively charged sphere like seeds in a watermelon

  4. ((d))

    Moving in fixed orbits around the nucleus

Show Answer
Answer: ((a))

Randomly placed inside the nucleus

6

A student pushes a heavy box that is already moving across a rough floor. If the force applied by the student is exactly equal to the frictional force opposing the motion, what will happen to the box?

  1. ((a))

    The box will move at a constant speed

  2. ((b))

    The box will move at increasing speed

  3. ((c))

    The box will gradually come to rest

  4. ((d))

    The box will accelerate forward

Show Answer
Answer: ((a))

The box will move at a constant speed

7

What is the main reason sulfur dioxide irritates the upper respiratory mucous membrane?

  1. ((a))

    It dissolves in moisture in upper respiratory tract and forms irritant

  2. ((b))

    It combines with other pollutants and polymerizes in the lungs

  3. ((c))

    It combines with haemoglobin and effect the oxygen transport

  4. ((d))

    It oxidizes to sulphur trioxide and inhaled deep into lung

Show Answer
Answer: ((a))

It dissolves in moisture in upper respiratory tract and forms irritant

8

Which type of computer virus attaches itself to executable files and gets activated when the file is run?

  1. ((a))

    Worm

  2. ((b))

    Macro Virus

  3. ((c))

    Boot Sector Virus

  4. ((d))

    File Infector Virus

Show Answer
Answer: ((a))

Worm

9

Which of the following statements is true about the Outbox?

  1. ((a))

    It is used to receive incoming emails.

  2. ((b))

    It contains emails that are currently being drafted.

  3. ((c))

    It temporarily stores emails that are queued for sending.

  4. ((d))

    It holds emails that have been successfully sent.

Show Answer
Answer: ((a))

It is used to receive incoming emails.

10

Which experimental discovery contradicted Thomson's model of the atom and led to its rejection?

  1. ((a))

    Discovery of the neutron by James Chadwick

  2. ((b))

    Alpha particle scattering showing deflection at large angles

  3. ((c))

    Measurement of atomic radius using X-ray diffraction

  4. ((d))

    Observation of line spectra of hydrogen by Bohr

Show Answer
Answer: ((a))

Discovery of the neutron by James Chadwick

11

If cell A1 = 10 and B1 = 20, what will =A1+B1 return?

  1. ((a))

    200

  2. ((b))

    30

  3. ((c))

    Error

  4. ((d))

    1020

Show Answer
Answer: ((a))

200

12

In a real-life scenario, a chemist discovers a compound with the formula CH3CH2CH(CH3)CH2CH2OH. What is the correct IUPAC name for this compound?

  1. ((a))

    3-methylhexanol

  2. ((b))

    4-methylpentanol

  3. ((c))

    3-methylpentan-1-ol

  4. ((d))

    2-methylhexanol

Show Answer
Answer: ((a))

3-methylhexanol

13

Which pair of sectors is commonly addressed together in State Action Plan on Climate Change (SAPCC) adaptation planning?

  1. ((a))

    Heavy industry and entertainment

  2. ((b))

    Information technology and space research

  3. ((c))

    Textile design and fashion marketing

  4. ((d))

    Water resources and health systems

Show Answer
Answer: ((a))

Heavy industry and entertainment

14

The Atal Bhujal Yojana 2020 focused on improving water resources management of how many states?

  1. ((a))

    eight

  2. ((b))

    ten

  3. ((c))

    five

  4. ((d))

    seven

Show Answer
Answer: ((a))

eight

15

Who won the maximum number of medals at the 38th National Games of India?

  1. ((a))

    Manu Bhaker

  2. ((b))

    Neeraj Chopra

  3. ((c))

    Bajrang Punia

  4. ((d))

    Dhinidhi Desinghu

Show Answer
Answer: ((a))

Manu Bhaker

16

Which of the following best describes how sound travels through air?

  1. ((a))

    The air particles vibrate up and down perpendicular to the direction of the wave

  2. ((b))

    The air particles move in circular paths as the wave passes

  3. ((c))

    The air particles remain stationary while the wave moves through

  4. ((d))

    The air particles vibrate back and forth parallel to the direction of the wave

Show Answer
Answer: ((a))

The air particles vibrate up and down perpendicular to the direction of the wave

17

Which of the following Articles states about the right of individual to form associations or unions or co-operative societies?

  1. ((a))

    Article 19 (1) (c)

  2. ((b))

    Article 19 (1) (b)

  3. ((c))

    Article 19 (1) (a)

  4. ((d))

    Article 19 (1) (d)

Show Answer
Answer: ((a))

Article 19 (1) (c)

18

The primary method of managing biodegradable domestic waste after collection is _________________.

  1. ((a))

    burnt in open air

  2. ((b))

    conversion into compost

  3. ((c))

    sending for recycling

  4. ((d))

    throwing into sewers

Show Answer
Answer: ((a))

burnt in open air

19

Which Quick Style type is applied only to selected words or individual characters within a paragraph in MS Word 2010?

  1. ((a))

    Character styles

  2. ((b))

    Paragraph styles

  3. ((c))

    Page styles

  4. ((d))

    Linked styles

Show Answer
Answer: ((a))

Character styles

20

If 10 grams of salt are dissolved in 100 mL of water, which component is the solute?

  1. ((a))

    Neither

  2. ((b))

    Salt only

  3. ((c))

    Water only

  4. ((d))

    Both salt and water

Show Answer
Answer: ((a))

Neither

21

The pollutant group commonly associated with oil spills in oceans is ______________.

  1. ((a))

    synthetic detergents

  2. ((b))

    petroleum products

  3. ((c))

    agricultural pesticides

  4. ((d))

    chemical fertilizers

Show Answer
Answer: ((a))

synthetic detergents

22

Which of the following best describes the velocity-time graph for an object moving with uniform velocity?

  1. ((a))

    A straight horizontal line parallel to the time axis

  2. ((b))

    A curved line above the time axis

  3. ((c))

    A straight line sloping upwards from the time axis

  4. ((d))

    A line starting from the origin and sloping upwards

Show Answer
Answer: ((a))

A straight horizontal line parallel to the time axis

23

A student accidentally spills some hydrochloric acid on a table. Which substance should be used to neutralise the acid safely?

  1. ((a))

    Lemon juice

  2. ((b))

    Baking soda solution

  3. ((c))

    Sugar solution

  4. ((d))

    Vinegar

Show Answer
Answer: ((a))

Lemon juice

24

The atmospheric component that remains largely unreactive is _____________.

  1. ((a))

    Carbon dioxide

  2. ((b))

    Methane

  3. ((c))

    Oxygen

  4. ((d))

    Argon

Show Answer
Answer: ((a))

Carbon dioxide

25

Which of the following satellites was launched on November 2, 2025, to enhance the Indian Navy’s secure communication network and maritime surveillance capabilities?

  1. ((a))

    RISAT-2B

  2. ((b))

    GSAT-6A

  3. ((c))

    CMS-03 (GSAT-7R)

  4. ((d))

    Cartosat-3

Show Answer
Answer: ((a))

RISAT-2B

26

Which of the following rivers forms a delta along the eastern coastal plains?

  1. ((a))

    Tapi

  2. ((b))

    Narmada

  3. ((c))

    Godavari

  4. ((d))

    Ganga

Show Answer
Answer: ((a))

Tapi

27

Which new warship was commissioned by the Indian Navy in November, 2025, to strengthen anti-submarine and coastal defence capabilities?

  1. ((a))

    INS Vikrant

  2. ((b))

    INS Mahe

  3. ((c))

    INS Ikshak

  4. ((d))

    INS Arnala

Show Answer
Answer: ((a))

INS Vikrant

28

The primary goal of the Pradhan Mantri Gram Sadak Yojana (PMGSY) is to:

  1. ((a))

    Develop urban infrastructure

  2. ((b))

    Provide rural connectivity through road construction

  3. ((c))

    Enhance telecommunication services in cities

  4. ((d))

    Promote renewable energy usage

Show Answer
Answer: ((a))

Develop urban infrastructure

29

Which of the following is/are the primary reasons to fall in the trap of Email fraud or phishing?
A) Paying attention to lucrative offers.
B) Not checking on links or attachments from unknown senders
C) Providing official information via email
D) Paying attention to the company logo sent in the email

  1. ((a))

    A, B Only

  2. ((b))

    A, B, D Only

  3. ((c))

    A, B, C Only

  4. ((d))

    A only

Show Answer
Answer: ((a))

A, B Only

30

The Kol Rebellion (1831–32) mainly affected which plateau region?

  1. ((a))

    Meghalaya Plateau

  2. ((b))

    Deccan Plateau

  3. ((c))

    Malwa Plateau

  4. ((d))

    Chotanagpur Plateau

Show Answer
Answer: ((a))

Meghalaya Plateau

31

A farmer applies large amounts of chemical fertilizers over several years. Which consequence most likely results from this practice leading to soil pollution?

  1. ((a))

    Erosion of surface soil layers

  2. ((b))

    Faster plant growth every season

  3. ((c))

    Increase in earthworm population

  4. ((d))

    Accumulation of toxic substances in soil

Show Answer
Answer: ((a))

Erosion of surface soil layers

32

Which British colonial building in Mumbai, completed in 1888, showcases a blend of Victorian Gothic and Indian architectural elements?

  1. ((a))

    Chhatrapati Shivaji Maharaj Terminus

  2. ((b))

    Gateway of India

  3. ((c))

    Rajabai Clock Tower

  4. ((d))

    Bombay Town Hall

Show Answer
Answer: ((a))

Chhatrapati Shivaji Maharaj Terminus

33

Which of the following statements best describes the behavior of magnetic field lines around a straight current-carrying conductor?

  1. ((a))

    They change direction randomly along the wire.

  2. ((b))

    They radiate straight outward from the wire.

  3. ((c))

    They form concentric circles centered on the conductor.

  4. ((d))

    They are parallel straight lines along the wire.

Show Answer
Answer: ((a))

They change direction randomly along the wire.

34

Consider the following statements regarding chemical reactions and choose the correct option.

Statement I: Every reaction in which two or more reactants combine to form a single product is classified as a combination reaction regardless of heat change.

Statement II: The reaction CaO(s) + H2O(l) → Ca(OH)2(aq) + heat is both a combination reaction and an exothermic reaction.

  1. ((a))

    Both statements are incorrect

  2. ((b))

    Both statements are correct

  3. ((c))

    Only Statement II is correct

  4. ((d))

    Only Statement I is correct

Show Answer
Answer: ((a))

Both statements are incorrect

35

How can we locate a file with a known extension but an unknown name in a large directory?

  1. ((a))

    Using the dir command

  2. ((b))

    Using the Search box in File Explorer with *.ext

  3. ((c))

    Checking the Recycle Bin

  4. ((d))

    Through File Explorer

Show Answer
Answer: ((a))

Using the dir command

36

When was the 11th National Handloom Day celebrated across India under the coordination of the Ministry of Textiles?

  1. ((a))

    September 7, 2025

  2. ((b))

    November 7, 2025

  3. ((c))

    August 7, 2025

  4. ((d))

    October 7, 2025

Show Answer
Answer: ((a))

September 7, 2025

37

Which function returns the smallest value?

  1. ((a))

    AVERAGE

  2. ((b))

    COUNT()

  3. ((c))

    MAX()

  4. ((d))

    MIN()

Show Answer
Answer: ((a))

AVERAGE

38

A field exposed to excessive pesticide use shows a sharp decline in earthworm population. The resulting effect on soil is:

  1. ((a))

    Reduced soil fertility

  2. ((b))

    Enhanced decomposition

  3. ((c))

    Increased water retention

  4. ((d))

    Improved aeration

Show Answer
Answer: ((a))

Reduced soil fertility

39

Which of the following statements best describes how the power of accommodation enables the human eye to focus on both near and distant objects?

  1. ((a))

    The cornea provides all the focusing power required for clear vision

  2. ((b))

    The eye lens changes its focal length by altering its shape through ciliary muscle action

  3. ((c))

    The iris controls the amount of light entering and helps to focus

  4. ((d))

    The retina moves forward and backward to adjust the focus

Show Answer
Answer: ((a))

The cornea provides all the focusing power required for clear vision

40

On which date is National Handloom Day observed in India?

  1. ((a))

    2 October

  2. ((b))

    18 August

  3. ((c))

    5 September

  4. ((d))

    7 August

Show Answer
Answer: ((a))

2 October

41

What is the general formula of alkenes?

  1. ((a))

    CnHn

  2. ((b))

    CnH2n−2

  3. ((c))

    CnH2n

  4. ((d))

    CnH2n+2

Show Answer
Answer: ((a))

CnHn

42

Which of the following options must be DISABLED before manually setting the date and time in Windows?

  1. ((a))

    Enable multiple clocks

  2. ((b))

    Set time automatically

  3. ((c))

    Night Light

  4. ((d))

    Set time zone globally

Show Answer
Answer: ((a))

Enable multiple clocks

43

The Mappila Uprisings of the 19th century occurred mainly in which region of India?

  1. ((a))

    Malabar region of Kerala

  2. ((b))

    Coromandel Coast of Tamil Nadu

  3. ((c))

    Sunderbans region of West Bengal

  4. ((d))

    Konkan region of Maharashtra

Show Answer
Answer: ((a))

Malabar region of Kerala

44

Biomedical waste handlers in a hospital are at risk of occupational hazards. The most effective way to protect them from exposure to infectious materials is:

  1. ((a))

    Segregation of waste into color-coded bins

  2. ((b))

    Use of protective equipment and safe handling

  3. ((c))

    Vaccination against common infections

  4. ((d))

    Regular medical check-ups

Show Answer
Answer: ((a))

Segregation of waste into color-coded bins

45

Which of the following is a primary mission under India's National Action Plan on Climate Change (NAPCC)?

  1. ((a))

    National Nutrition Mission

  2. ((b))

    National Solar Mission

  3. ((c))

    National Rural Livelihood Mission

  4. ((d))

    National Highway Development Project

Show Answer
Answer: ((a))

National Nutrition Mission

46

The term 'smog' is a combination of ____________.

  1. ((a))

    Fog and clouds

  2. ((b))

    Smoke and haze

  3. ((c))

    Smoke and fog

  4. ((d))

    Smog and mist

Show Answer
Answer: ((a))

Fog and clouds

47

Match the following columns.

Pardoning powerFunction
1. Commutationa. Removes both sentence and the conviction.
2. Reprieveb. Lesser sentence than originally given, in special cases.
3. Respitec. Reducing the period of sentence without changing the character of the sentence.
4. Remissiond. Temporary stay on the execution of a sentence.
5. Pardone. Substitution of one form of punishment to a lighter one.
  1. ((a))

    1-e, 2-d, 3-b, 4-c, 5-a

  2. ((b))

    1-c, 2-e, 3-b, 4-a, 5-d

  3. ((c))

    1-d, 2-b, 3-e, 4-c, 5-a

  4. ((d))

    1-a, 2-c, 3-d, 4-e, 5-b

Show Answer
Answer: ((a))

1-e, 2-d, 3-b, 4-c, 5-a

48

Which of the following indicators is NOT typically used to measure sustainable development?

  1. ((a))

    Human Development Index (HDI)

  2. ((b))

    Gross Domestic Product (GDP) growth rate

  3. ((c))

    Biocapacity

  4. ((d))

    Ecological Footprint

Show Answer
Answer: ((a))

Human Development Index (HDI)

49

A factory plans to install a powerful electromagnet for lifting metal scraps. To maximize the magnetic field strength around the coil, which of the following combinations would be most effective?

  1. ((a))

    Using a copper core, increasing coil turns, and lowering current

  2. ((b))

    Using an air core, decreasing coil turns, and keeping current constant

  3. ((c))

    Using a steel core, decreasing coil turns, and lowering current

  4. ((d))

    Using a soft iron core, increasing coil turns, and increasing current through the coil

Show Answer
Answer: ((a))

Using a copper core, increasing coil turns, and lowering current

50

You want to automatically advance slides with narration and animations during a presentation. Which MS PowerPoint feature should you use to achieve this?

  1. ((a))

    Action Buttons

  2. ((b))

    Slide Sorter

  3. ((c))

    Rehearse Timings

  4. ((d))

    Presenter View

Show Answer
Answer: ((a))

Action Buttons

Technical Abilities (100 questions)

51

You need to read a floating-point value from the user in the C programming language.

Which of the following statements correctly performs this task?

  1. ((a))

    float x; scanf("%f",*x);

  2. ((b))

    float x; scanf("%d" , &x);

  3. ((c))

    float x; scanf("%f" , x);

  4. ((d))

    float x; scanf("%f, &x);

Show Answer
Answer: ((a))

float x; scanf("%f",*x);

52

In a centralized switching system,
what is the Control Unit responsible for?

  1. ((a))

    Physically moving the copper wires

  2. ((b))

    Generating the voice of the caller

  3. ((c))

    Generating the ringing voltage only

  4. ((d))

    Processing dialed digits and managing call setup

Show Answer
Answer: ((a))

Physically moving the copper wires

53

A designer is selecting an LED driver for an outdoor display exposed to dust and rain.
Which specification should be examined first to determine whether the driver can withstand these environmental conditions?

  1. ((a))

    Dimming compatibility

  2. ((b))

    Output current tolerance

  3. ((c))

    Power factor rating

  4. ((d))

    Ingress Protection (IP) rating

Show Answer
Answer: ((a))

Dimming compatibility

54

What are the statements that begin with # symbol called in C programming language?

  1. ((a))

    Comments

  2. ((b))

    Control statements

  3. ((c))

    Function declarations

  4. ((d))

    Preprocessor Directives

Show Answer
Answer: ((a))

Comments

55

In an analog Stored Program Control (SPC) system,
the Program manages:

  1. ((a))

    The electronic connection of the analog matrix

  2. ((b))

    The digital conversion of the voice signal

  3. ((c))

    The internet connection of the subscriber

  4. ((d))

    The brightness of the telephone screen

Show Answer
Answer: ((a))

The electronic connection of the analog matrix

56

The holding current of an SCR is defined as the:

  1. ((a))

    Minimum anode current required to turn on the SCR

  2. ((b))

    Gate current required to turn off the SCR

  3. ((c))

    Minimum anode current required to keep the SCR in conduction state

  4. ((d))

    Maximum anode current the SCR can withstand

Show Answer
Answer: ((a))

Minimum anode current required to turn on the SCR

57

In the 8085 microprocessor,
what happens to the Stack Pointer after execution of PUSH instruction?

  1. ((a))

    Unchanged

  2. ((b))

    Incremented by 1

  3. ((c))

    Decremented by 2

  4. ((d))

    Incremented by 2

Show Answer
Answer: ((a))

Unchanged

58

Which cable transmits data using light signals?

  1. ((a))

    Coaxial cable

  2. ((b))

    Fiber optic cable

  3. ((c))

    USB cable

  4. ((d))

    Twisted pair cable

Show Answer
Answer: ((a))

Coaxial cable

59

A synchronous counter is a counter in which:

  1. ((a))

    All flip-flops are triggered simultaneously

  2. ((b))

    No clock is used

  3. ((c))

    Only one flip-flop is used

  4. ((d))

    Flip-flops are triggered one by one

Show Answer
Answer: ((a))

All flip-flops are triggered simultaneously

60

For Astable Multivibrator using IC 555,
to increase the frequency of an astable 555 circuit without changing the duty cycle ratio, what should a designer do? Assume standard terminologies and resistor names.

  1. ((a))

    Increase the value of Capacitor C

  2. ((b))

    Decrease the supply voltage

  3. ((c))

    Decrease the value of C while keeping resistors RA and RB constant

  4. ((d))

    Increase the value of R_A

Show Answer
Answer: ((a))

Increase the value of Capacitor C

61

In the 8085 microprocessor, what does the instruction PCHL do?

  1. ((a))

    Loads the PC with HL

  2. ((b))

    Pops the PC from the stack

  3. ((c))

    Loads HL with the PC

  4. ((d))

    Pushes PC onto the stack

Show Answer
Answer: ((a))

Loads the PC with HL

62

If a communication system performs effectively in between 200 Hz to 3.4 kHz, what is its bandwidth?

  1. ((a))

    200 Hz

  2. ((b))

    3.2 kHz

  3. ((c))

    3.6 kHz

  4. ((d))

    3.4 kHz

Show Answer
Answer: ((a))

200 Hz

63

What happens to the frequency of an astable multivibrator if the value of ONLY the timing capacitor is doubled?

  1. ((a))

    The frequency remains the same.

  2. ((b))

    The frequency is reduced by half.

  3. ((c))

    The frequency doubles.

  4. ((d))

    The frequency increases fourfold.

Show Answer
Answer: ((a))

The frequency remains the same.

64

In a monostable configuration of IC 555,
why is the Discharge pin (Pin 7) connected directly to the Threshold pin (Pin 6)?

  1. ((a))

    To allow the capacitor to charge very slowly for stable output.

  2. ((b))

    To trigger the next pulse automatically.

  3. ((c))

    To prevent the capacitor from ever reaching 2/3 Vcc

  4. ((d))

    To ensure the capacitor is instantly discharged once the threshold is reached.

Show Answer
Answer: ((a))

To allow the capacitor to charge very slowly for stable output.

65

What would happen if an electrical device is not earthed and a fault occurs?

  1. ((a))

    The supply voltage will decrease

  2. ((b))

    The exposed metal parts may carry dangerous voltage

  3. ((c))

    The resistance of the device will increase

  4. ((d))

    The device will automatically shut down

Show Answer
Answer: ((a))

The supply voltage will decrease

66

What is the BCD code for decimal digit 3?

  1. ((a))

    0110

  2. ((b))

    0101

  3. ((c))

    0011

  4. ((d))

    0001

Show Answer
Answer: ((a))

0110

67

If the same quantity is measured several times and the readings vary slightly each time,
which type of error is most likely present?

  1. ((a))

    Systematic error

  2. ((b))

    Random error

  3. ((c))

    Parallax error

  4. ((d))

    Calibration error

Show Answer
Answer: ((a))

Systematic error

68

When a NOR-based SR flip-flop with active HIGH inputs receives a momentary logic high on its S (set) input while the R (reset) input remains low,
what will be the resulting state of the Q output?

  1. ((a))

    Q becomes HIGH and remains latched HIGH

  2. ((b))

    The Q output will toggle between high and low repeatedly

  3. ((c))

    Both outputs will become high during the pulse

  4. ((d))

    The Q output will become low after S returns to low

Show Answer
Answer: ((a))

Q becomes HIGH and remains latched HIGH

69

What is the function of the INTA' signal in the 8085 microprocessor?

  1. ((a))

    To disable interrupts

  2. ((b))

    To reset the processor

  3. ((c))

    To acknowledge an interrupt request

  4. ((d))

    To enable interrupts

Show Answer
Answer: ((a))

To disable interrupts

70

Signal A passes through a NOT gate and then through an AND gate where the second input is permanently set to logic 1.

What is the final output expression?

  1. ((a))

    Y = Always 0

  2. ((b))

    Y = A

  3. ((c))

    Y=A‾Y = \overline{A}

  4. ((d))

    Y  = Always  1

Show Answer
Answer: ((a))

Y = Always 0

71

In the magnetic trip mechanism of an MCB, which sequence correctly describes the tripping action during a short circuit?

  1. ((a))

    Fault current → contact resistance increases → plunger attracted → latch released

  2. ((b))

    Fault current → plunger released → magnetic field generated → contacts open

  3. ((c))

    Fault current → bimetal strip bends → latch released → contacts open

  4. ((d))

    Fault current → magnetic field generated → plunger attracted → latch released

Show Answer
Answer: ((a))

Fault current → contact resistance increases → plunger attracted → latch released

72

How many PN junctions are present in the structure of a Silicon Controlled Rectifier (SCR)?

  1. ((a))

    Four

  2. ((b))

    Two

  3. ((c))

    One

  4. ((d))

    Three

Show Answer
Answer: ((a))

Four

73

An engineer is designing a feedback control system using a potentiometer transducer to measure angular position.
What is the primary effect if a voltmeter with low resistance is connected to measure the potentiometer output?

  1. ((a))

    It reduces the mechanical lifespan of the potentiometer due to excess current

  2. ((b))

    It causes loading error, resulting in nonlinear output voltage relative to wiper position

  3. ((c))

    It maximizes sensitivity and accuracy of the measuring instrument

  4. ((d))

    It increases output signal noise regardless of wiper position

Show Answer
Answer: ((a))

It reduces the mechanical lifespan of the potentiometer due to excess current

74

Using De Morgan’s law, what is the equivalent of (P.Q.R‾)(\overline{P.Q.R}) ?

  1. ((a))

    P‾+Q‾+R‾\overline{P}+\overline{Q}+\overline{R}

  2. ((b))

    P . Q . R

  3. ((c))

    P‾.Q‾.R‾ \overline{P}.\overline{Q}.\overline{R}

  4. ((d))

    P + Q + R

Show Answer
Answer: ((a))

P‾+Q‾+R‾\overline{P}+\overline{Q}+\overline{R}

75

What allows a Radar system to detect the presence of a target?

  1. ((a))

    Electromagnetic wave reflection

  2. ((b))

    Acoustic resonance

  3. ((c))

    Chemical ionization

  4. ((d))

    Atmospheric refraction

Show Answer
Answer: ((a))

Electromagnetic wave reflection

76

A 1 mA,100 Ω meter movement is converted to a 100 mA ammeter using a parallel shunt resistor. If this shunt resistor suddenly becomes open-circuited while a steady line current of 80 mA is passing through the meter, what is the most likely outcome?

  1. ((a))

    The meter continues to indicate the measured current correctly

  2. ((b))

    The meter indication drops to zero due to loss of shunt current

  3. ((c))

    The meter becomes more sensitive and shows larger deflections

  4. ((d))

    Excessive current may flow through the meter movement and damage it

Show Answer
Answer: ((a))

The meter continues to indicate the measured current correctly

77

Which operator is used for dynamic memory allocation in C++?

  1. ((a))

    alloc

  2. ((b))

    allocate

  3. ((c))

    delete

  4. ((d))

    new

Show Answer
Answer: ((a))

alloc

78

What is the output of the give C language code snippet?

void f(int x)
{
x = x + 5;
}
int main()
{
int a = 10;
f(a);
printf("%d",a);
return 0;
}

  1. ((a))

    15

  2. ((b))

    5

  3. ((c))

    10

  4. ((d))

    Garbage value

Show Answer
Answer: ((a))

15

79

Which of the following best describes packet switching in computer network?

  1. ((a))

    Dedicated physical path between sender and receiver

  2. ((b))

    Entire message transmitted as one continuous signal

  3. ((c))

    Fixed bandwidth allocated permanently to users

  4. ((d))

    Data divided into smaller packets transmitted independently

Show Answer
Answer: ((a))

Dedicated physical path between sender and receiver

80

Why is a high-sensitivity voltmeter preferred for accurate circuit measurements?

  1. ((a))

    It reduces the response time of the instrument

  2. ((b))

    It minimizes loading effect by drawing very small current

  3. ((c))

    It increases the operating frequency of the circuit

  4. ((d))

    It increases the power consumption of the measuring circuit

Show Answer
Answer: ((a))

It reduces the response time of the instrument

81

Which of the following statements is TRUE about data transmission modes?

  1. ((a))

    Parallel transmission can transmit multiple bits simultaneously

  2. ((b))

    Serial transmission always requires more communication lines

  3. ((c))

    Parallel transmission sends one bit at a time

  4. ((d))

    Serial transmission sends multiple bits simultaneously

Show Answer
Answer: ((a))

Parallel transmission can transmit multiple bits simultaneously

82

Assume an SCR is operating in the forward blocking state. Once a sufficient positive current pulse is applied to the gate terminal, the SCR triggers into the conduction state. What happens if the gate signal is completely removed immediately after conduction starts?

  1. ((a))

    The SCR will immediately turn off.

  2. ((b))

    The SCR will begin to oscillate between the ON and OFF states.

  3. ((c))

    The SCR will continue to conduct until the anode current drops below the holding current.

  4. ((d))

    The anode current will drop by exactly 50%.

Show Answer
Answer: ((a))

The SCR will immediately turn off.

83

What is the output of the given C language code snippet?#includevoid f(int n){ if(n==0) return; printf("%d ",n); f(n-1);}int main(){ f(3); return 0;}

  1. ((a))

    1 2 3

  2. ((b))

    3 2 1 0

  3. ((c))

    3 2 1

  4. ((d))

    Infinite loop

Show Answer
Answer: ((a))

1 2 3

84

In the 8085 microprocessor, what will be the value of the Program Counter after execution of the instruction RST 3?

  1. ((a))

    0024H

  2. ((b))

    0003H

  3. ((c))

    0018H

  4. ((d))

    0030H

Show Answer
Answer: ((a))

0024H

85

A constant negative DC voltage is applied to the input of an inverting integrator. Assuming the op-amp starts at zero volts and remains unsaturated, the output will be:

  1. ((a))

    A negative-going linear ramp

  2. ((b))

    A square wave

  3. ((c))

    A constant DC voltage

  4. ((d))

    A positive-going linear ramp

Show Answer
Answer: ((a))

A negative-going linear ramp

86

A user wants to transmit uncompressed digital audio and video between a computer and a display using a single cable. Which connector type is most appropriate?

  1. ((a))

    F connector

  2. ((b))

    BNC connector

  3. ((c))

    RCA connector

  4. ((d))

    HDMI connector

Show Answer
Answer: ((a))

F connector

87

Which shape is used to represent a decision in a flowchart?

  1. ((a))

    Parallelogram

  2. ((b))

    Rectangle

  3. ((c))

    Oval

  4. ((d))

    Diamond

Show Answer
Answer: ((a))

Parallelogram

88

Why should electrical connections be regularly tightened in high-current circuits?

  1. ((a))

    Tight connections ensure lower circuit voltage

  2. ((b))

    It avoids electromagnetic interference

  3. ((c))

    It prevents accidental current reversal

  4. ((d))

    Loose connections cause localized heating and fire risk

Show Answer
Answer: ((a))

Tight connections ensure lower circuit voltage

89

In the 8085 microprocessor, if SP = 3FFFH and memory contains:
3FFEH = 20H
3FFFH = 20H
4000H = 10H
4001H =10H

After executing POP H, what will be the contents of HL?

  1. ((a))

    1020H

  2. ((b))

    2020H

  3. ((c))

    1010H

  4. ((d))

    2010H

Show Answer
Answer: ((a))

1020H

90

In 8051, consider the following instructions:
MOV PSW, #18H
MOV R3, #55H
MOV A, R3

From which register bank is R3 selected in the instruction MOV A, R3?

  1. ((a))

    Bank 1

  2. ((b))

    Bank 3

  3. ((c))

    Bank 2

  4. ((d))

    Bank 0

Show Answer
Answer: ((a))

Bank 1

91

Consider the following code snippet in C programming language.
int n = 5;
int m = n++;
What is the value of m after execution?

  1. ((a))

    6

  2. ((b))

    0

  3. ((c))

    1

  4. ((d))

    5

Show Answer
Answer: ((a))

6

92

In an LCD display, what is the main purpose of the liquid crystal layer positioned between the two glass plates?

  1. ((a))

    To store electrical energy for the display circuit

  2. ((b))

    To control the transmission of light through the display

  3. ((c))

    To increase the operating voltage of the display segment

  4. ((d))

    To act as a light source for displaying characters

Show Answer
Answer: ((a))

To store electrical energy for the display circuit

93

Which arrangement is used in a CRT of Cathode Ray Oscilloscope (CRO) to achieve proper electrostatic focusing of the electron beam?

  1. ((a))

    A cathode at high potential followed by only high potential accelerating anodes

  2. ((b))

    Two accelerating anodes at equal potential without a focusing anode

  3. ((c))

    A fluorescent screen at lower potential placed after the high potential accelerating anodes

  4. ((d))

    A focusing anode at lower potential placed between two high potential accelerating anodes

Show Answer
Answer: ((a))

A cathode at high potential followed by only high potential accelerating anodes

94

Which of the following is a false statement regarding the non-inverting amplifier using OP-AMP?

  1. ((a))

    It provides higher magnitude gain for the same resistor values when compared to the inverting amplifier

  2. ((b))

    It offers high input impedance

  3. ((c))

    It is ideal for use in instrumentation and buffer circuits

  4. ((d))

    It is limited to handling only DC signals

Show Answer
Answer: ((a))

It provides higher magnitude gain for the same resistor values when compared to the inverting amplifier

95

A single-phase AC circuit contains a resistive inductive load. The current lags behind the voltage by an angle greater than 0° and less than 90°. What is the power factor of the circuit called?

  1. ((a))

    Lagging power factor

  2. ((b))

    Leading power factor

  3. ((c))

    Zero power factor

  4. ((d))

    Unity power factor

Show Answer
Answer: ((a))

Lagging power factor

96

What is the main reason high-frequency Carrier signals are used in modulation?

  1. ((a))

    To eliminate the need for a receiver.

  2. ((b))

    To make the signal move at the speed of light.

  3. ((c))

    To reduce the physical size of the required antenna.

  4. ((d))

    To amplify the original message signal.

Show Answer
Answer: ((a))

To eliminate the need for a receiver.

97

Which internal component of the IC 555 is responsible for resetting the flip-flop when the voltage at Pin 6 exceeds two-thirds of Vcc supply?

  1. ((a))

    The Lower Comparator

  2. ((b))

    The Upper Comparator

  3. ((c))

    The Voltage Divider Network

  4. ((d))

    The Discharge Transistor

Show Answer
Answer: ((a))

The Lower Comparator

98

In a 4-to-2 priority encoder, if both D1 and D3 are HIGH, which input determines the output and why?

  1. ((a))

    D3 determines the output because it has higher priority

  2. ((b))

    The output is undefined due to multiple actives

  3. ((c))

    Both D1 and D3 set the output together

  4. ((d))

    D1 determines the output because it is the lower number

Show Answer
Answer: ((a))

D3 determines the output because it has higher priority

99

Which action is the most important for maintaining accurate measurements in an instrument?

  1. ((a))

    Operating the instrument always at maximum frequency range.

  2. ((b))

    Reduce the sensitivity of the instrument

  3. ((c))

    Calibrate the instrument using a standard reference

  4. ((d))

    Setting the amplifier gain of the instrument to zero

Show Answer
Answer: ((a))

Operating the instrument always at maximum frequency range.

100

What is the output the given C language code snippet?#includeint main(){ int x[] = {10,20,30}; int *p = x; p++; printf("%d",*p); return 0;}

  1. ((a))

    10

  2. ((b))

    Garbage value

  3. ((c))

    30

  4. ((d))

    20

Show Answer
Answer: ((a))

10

101

What is the purpose of the Back-off technique in transponder power amplifiers related to Satellite communication?

  1. ((a))

    To save satellite battery life during the night

  2. ((b))

    To increase the maximum output power

  3. ((c))

    To increase the speed of data transmission

  4. ((d))

    To reduce intermodulation distortion when multiple carriers are present

Show Answer
Answer: ((a))

To save satellite battery life during the night

102

Which type of network typically experiences the lowest transmission delay?

  1. ((a))

    WAN

  2. ((b))

    Satellite Network

  3. ((c))

    MAN

  4. ((d))

    LAN

Show Answer
Answer: ((a))

WAN

103

A resistor connected to a DC supply of 20 V produces the same heating effect as an AC supply connected across the same resistor. What is the RMS value of the AC voltage?

  1. ((a))

    14.14 V

  2. ((b))

    28.28 V

  3. ((c))

    10 V

  4. ((d))

    20 V

Show Answer
Answer: ((a))

14.14 V

104

In a pulsed radar system, the __________ power is the maximum instantaneous power delivered during the pulse width, whereas the __________ power is the mean power output calculated over the total transmission cycle.

  1. ((a))

    Peak; Average

  2. ((b))

    Average; Peak

  3. ((c))

    Effective; Gain

  4. ((d))

    Pulsed; Continuous

Show Answer
Answer: ((a))

Peak; Average

105

In a graded-index Optical fiber, how is the refractive index distributed?

  1. ((a))

    Increasing from center to edge

  2. ((b))

    Higher in the cladding than the core

  3. ((c))

    Decreasing continuously from center to edge

  4. ((d))

    Uniformly throughout the core

Show Answer
Answer: ((a))

Increasing from center to edge

106

According to Carson's Rule, the approximate bandwidth of a frequency modulation signal is __________.

  1. ((a))

    Equal to the carrier frequency

  2. ((b))

    Twice the sum of the frequency deviation and the highest modulating frequency

  3. ((c))

    Infinite

  4. ((d))

    Twice the carrier frequency

Show Answer
Answer: ((a))

Equal to the carrier frequency

107

In Boolean algebra, what is the value of C + C'?

  1. ((a))

    0

  2. ((b))

    1

  3. ((c))

    C

  4. ((d))

    C · C'

Show Answer
Answer: ((a))

0

108

Consider the following statements about routing in computer networks.

S1: Routers operate at the network layer
S2: Routing determines packet forwarding paths
S3: Static routing updates automatically
S4: Dynamic routing protocols exchange routing information

Which of the given statements are TRUE?

  1. ((a))

    Only S2 and S3

  2. ((b))

    Only S1 and S2

  3. ((c))

    Only S1, S2 and S4

  4. ((d))

    Only S1 and S4

Show Answer
Answer: ((a))

Only S2 and S3

109

Consider the following statements regarding modems used in computer network:

S1: Modems are required when communication medium carries analog signals
S2: Modulation converts digital data into analog form
S3: Demodulation converts analog data into digital form
S4: Modems assign MAC addresses to computers

Which statements are TRUE?

  1. ((a))

    Only S1 and S2

  2. ((b))

    Only S1, S2 and S3

  3. ((c))

    Only S1 and S4

  4. ((d))

    Only S1, S3 and S4

Show Answer
Answer: ((a))

Only S1 and S2

110

The current flows directly into the input terminals of an ideal op-amp is _____________ due to ____________ input impedance.

  1. ((a))

    1 milliAmpere; zero

  2. ((b))

    1 Ampere; moderate

  3. ((c))

    zero; infinite

  4. ((d))

    dependent on the supply voltage; zero

Show Answer
Answer: ((a))

1 milliAmpere; zero

111

What does PPP stand for in Wide Area Network ( WAN ) communication?

  1. ((a))

    Private Port Protocol

  2. ((b))

    Packet Transfer Protocol

  3. ((c))

    Point-to-Point Protocol

  4. ((d))

    Public Packet Protocol

Show Answer
Answer: ((a))

Private Port Protocol

112

Which of the following statements about the Harvard architecture used in the 8051 microcontroller is correct?

  1. ((a))

    Uses only RAM

  2. ((b))

    Uses separate memory for program and data

  3. ((c))

    Has no external memory support

  4. ((d))

    Uses single memory for program and data

Show Answer
Answer: ((a))

Uses only RAM

113

A magnetic material has a hysteresis loop area of 0.4 J for each cycle. If the material is subjected to a frequency of 40 Hz, what is the total hysteresis loss per second?

  1. ((a))

    10 W

  2. ((b))

    12 W

  3. ((c))

    20 W

  4. ((d))

    16 W

Show Answer
Answer: ((a))

10 W

114

In the 8085 microprocessor, what operation is performed by the instruction SUI 20H?

  1. ((a))

    Compares with 20H with the accumulator

  2. ((b))

    Adds 20H to the accumulator

  3. ((c))

    Subtracts 20H from the accumulator

  4. ((d))

    Subtracts 20H from the accumulator with borrow

Show Answer
Answer: ((a))

Compares with 20H with the accumulator

115

The LPF in a PLL determines which of the following dynamic characteristics?

  1. ((a))

    Settling time and loop stability.

  2. ((b))

    The free-running frequency of the VCO.

  3. ((c))

    The maximum output power of the circuit.

  4. ((d))

    The input impedance of the phase detector.

Show Answer
Answer: ((a))

Settling time and loop stability.

116

A transmission line has a characteristic impedance of 50 ohm and is connected to a load of 100 ohm. The VSWR is _________.

  1. ((a))

    2

  2. ((b))

    4

  3. ((c))

    1

  4. ((d))

    0.5

Show Answer
Answer: ((a))

2

117

In a LAN environment, switches improve network efficiency primarily by:

  1. ((a))

    Broadcasting all frames to every device in the network

  2. ((b))

    Forwarding frames selectively using MAC addresses

  3. ((c))

    Converting digital signal to analog signal

  4. ((d))

    Increasing collision occurrences and retransmitting

Show Answer
Answer: ((a))

Broadcasting all frames to every device in the network

118

If the strength of the current in a straight wire is doubled, how does the magnitude of the magnetic field at a fixed distance from the wire change?

  1. ((a))

    The field strength remains unchanged

  2. ((b))

    The field strength doubles

  3. ((c))

    The field strength is halved

  4. ((d))

    The field strength quadruples

Show Answer
Answer: ((a))

The field strength remains unchanged

119

Consider the following statements about RS-232 ports and connectors.

S1: DB9 connector is associated with RS-232
S2: RS-232 uses RJ45 connector for standard serial communication
S3: RS-232 communication is point-to-point

Which statements are TRUE?

  1. ((a))

    Only S2 and S3

  2. ((b))

    Only S1 and S2

  3. ((c))

    Only S1 and S3

  4. ((d))

    Only S1

Show Answer
Answer: ((a))

Only S2 and S3

120

A 4 KB EPROM is organized with 8 data lines. How many address lines does it have?

  1. ((a))

    14

  2. ((b))

    8

  3. ((c))

    12

  4. ((d))

    10

Show Answer
Answer: ((a))

14

121

Which class of IPv4 addresses supports the largest number of host addresses in a computer network?

  1. ((a))

    Class A

  2. ((b))

    Class B

  3. ((c))

    Class C

  4. ((d))

    Class D

Show Answer
Answer: ((a))

Class A

122

The primary reason for the increase in resistance of metallic conductors with temperature is _____________.

  1. ((a))

    Atomic collisions inside the conductor increase

  2. ((b))

    Conducting path inside the material becomes shorter

  3. ((c))

    Number of free electrons becomes zero

  4. ((d))

    Atomic vibrations inside the conductor decrease

Show Answer
Answer: ((a))

Atomic collisions inside the conductor increase

123

What does the instruction ORA B do in 8085?

  1. ((a))

    Adds B to accumulator

  2. ((b))

    Subtracts B from accumulator

  3. ((c))

    Performs AND between accumulator and B

  4. ((d))

    Performs logical OR between accumulator and B

Show Answer
Answer: ((a))

Adds B to accumulator

124

Which characteristic primarily defines how accurately the vertical deflection system of a CRO displays signals of different amplitudes and frequencies?

  1. ((a))

    Accelerating anode voltage in the electron gun

  2. ((b))

    Phosphor persistence on the CRT screen

  3. ((c))

    The gain and frequency response of the vertical amplifier

  4. ((d))

    Operation of the sweep circuit and retrace interval

Show Answer
Answer: ((a))

Accelerating anode voltage in the electron gun

125

An op amp acting as a comparator typically operates in:

  1. ((a))

    Closed-loop mode with negative feedback

  2. ((b))

    Unity gain mode

  3. ((c))

    Open-loop mode

  4. ((d))

    Linear region only

Show Answer
Answer: ((a))

Closed-loop mode with negative feedback

126

A motor draws a starting current much higher than its running current. What should be considered when selecting a relay?

  1. ((a))

    Relay selection should focus only on minimum coil voltage

  2. ((b))

    Relay contact rating should match only the motor running current

  3. ((c))

    Relay selection depends solely on the coil voltage specification.

  4. ((d))

    Relay contact rating must exceed the motor's peak starting current

Show Answer
Answer: ((a))

Relay selection should focus only on minimum coil voltage

127

In the Hexagonal cell model, where is the Base Transceiver Station (BTS) typically located to provide uniform coverage?

  1. ((a))

    Exactly at the center of the hexagon

  2. ((b))

    Along the longest edge of the cell

  3. ((c))

    Outside the cell boundary to avoid interference

  4. ((d))

    At any one of the six corners

Show Answer
Answer: ((a))

Exactly at the center of the hexagon

128

A 2-input NOR gate has one input permanently connected to logic LOW (0). How does the output behave with respect to the other input?

  1. ((a))

    Output is the complement of the other input

  2. ((b))

    Output follows the other input directly

  3. ((c))

    Output is always LOW

  4. ((d))

    Output is always HIGH

Show Answer
Answer: ((a))

Output is the complement of the other input

129

If the modulating signal is a constant DC voltage, the output of a Phase Modulator will be:

  1. ((a))

    A signal with increasing frequency.

  2. ((b))

    Zero.

  3. ((c))

    A constant frequency signal with a fixed phase shift.

  4. ((d))

    A signal with varying amplitude.

Show Answer
Answer: ((a))

A signal with increasing frequency.

130

Why is earthing necessary for electrical equipment?

  1. ((a))

    To protect people from electric shock

  2. ((b))

    To improve light brightness

  3. ((c))

    To increase wire length

  4. ((d))

    To decrease power consumption

Show Answer
Answer: ((a))

To protect people from electric shock

131

How does the shading coil in an AC relay minimize contact chatter during operation?

  1. ((a))

    It delays the movement of the relay armature during release.

  2. ((b))

    It maintains a holding magnetic force during current zero crossing.

  3. ((c))

    It changes the relay's operating voltage rating.

  4. ((d))

    It maintains the spacing between relay contacts during operation.

Show Answer
Answer: ((a))

It delays the movement of the relay armature during release.

132

The transition of an SCR from the forward blocking state to the conduction state is called:

  1. ((a))

    Commutation

  2. ((b))

    Forward recovery

  3. ((c))

    Avalanche breakdown

  4. ((d))

    Triggering

Show Answer
Answer: ((a))

Commutation

133

What does the remanence (Br) indicate in a magnetic hysteresis loop?

  1. ((a))

    It is the maximum magnetic flux density reached in the loop.

  2. ((b))

    It is the residual magnetic flux density after removing the applied field.

  3. ((c))

    It is the applied field needed to reduce flux to zero.

  4. ((d))

    It is the area enclosed by the hysteresis loop.

Show Answer
Answer: ((a))

It is the maximum magnetic flux density reached in the loop.

134

Why does charging a lead-acid secondary cell increase the specific gravity of the electrolyte?

  1. ((a))

    It increases due to hydrogen gas raising electrolyte density

  2. ((b))

    Active materials reform and increase acid concentration

  3. ((c))

    It stays the same because separators control dilution

  4. ((d))

    It decreases due to formation of water from hydrogen and oxygen

Show Answer
Answer: ((a))

It increases due to hydrogen gas raising electrolyte density

135

Consider an abrupt p-n junction under thermal equilibrium. If the acceptor doping concentration (NA) in the p-region is made significantly larger than the donor doping concentration (ND) in the n-region (i.e., NA ≫ ND), how is the depletion region physically distributed?

  1. ((a))

    It is confined strictly to the metallurgical junction with zero penetration into either region.

  2. ((b))

    It extends primarily into the lightly doped n-type region.

  3. ((c))

    It extends primarily into the heavily doped p-type region.

  4. ((d))

    It extends equally into both the p-type and n-type regions.

Show Answer
Answer: ((a))

It is confined strictly to the metallurgical junction with zero penetration into either region.

136

A DC node has 1.8 A entering it. Two branches carry 0.6 A and 0.9 A away from the node. Assuming the remaining branch current is also leaving the node, what is its value?

  1. ((a))

    0.5 A

  2. ((b))

    0.9 A

  3. ((c))

    1.2 A

  4. ((d))

    0.3 A

Show Answer
Answer: ((a))

0.5 A

137

A technician is troubleshooting a circuit where the fuse does not blow during an overcurrent fault. What is the most likely cause?

  1. ((a))

    The fuse is installed after the protective relay.

  2. ((b))

    The fuse rating is higher than the circuit's safe current.

  3. ((c))

    The fuse wire has low resistance

  4. ((d))

    The fuse is connected in parallel with the load.

Show Answer
Answer: ((a))

The fuse is installed after the protective relay.

138

Which mechanical property allows a conductor to be drawn into thin wires without breaking?

  1. ((a))

    Ductility

  2. ((b))

    Brittleness

  3. ((c))

    Elasticity

  4. ((d))

    Hardness

Show Answer
Answer: ((a))

Ductility

139

What is the output of the following C programming language code?#includeint main(){ int x = 10; int *p = &x; *p = *p + 5; printf("%d %d", x, *p); return 0;}

  1. ((a))

    10 15

  2. ((b))

    15 15

  3. ((c))

    15 10

  4. ((d))

    10 10

Show Answer
Answer: ((a))

10 15

140

What happens to the amount of substance deposited if the time for which current flows through an electrolyte is doubled?

  1. ((a))

    It remains unchanged

  2. ((b))

    It becomes half

  3. ((c))

    It becomes zero

  4. ((d))

    It also doubles

Show Answer
Answer: ((a))

It remains unchanged

141

Which instruction is used to return from a subroutine in 8085?

  1. ((a))

    RET

  2. ((b))

    JMP

  3. ((c))

    RST

  4. ((d))

    CALL

Show Answer
Answer: ((a))

RET

142

During insulation testing of a long underground cable, a technician observes higher leakage current compared to a shorter cable of the same type. What is the most likely reason?

  1. ((a))

    Leakage current is independent of cable length for the same insulation material.

  2. ((b))

    A longer cable always has higher insulation resistance than a shorter cable.

  3. ((c))

    The increased cable length reduces the dielectric strength of the insulation.

  4. ((d))

    The larger insulation surface area provides more leakage paths to ground.

Show Answer
Answer: ((a))

Leakage current is independent of cable length for the same insulation material.

143

Which statement is TRUE about if statement in the C programming language?

  1. ((a))

    if statement cannot be nested

  2. ((b))

    Every if statement must have a matching else

  3. ((c))

    A non-zero value written in the condition means True

  4. ((d))

    A value of 0 written in the condition means True

Show Answer
Answer: ((a))

if statement cannot be nested

144

Which of the following contains only valid octal digits?

  1. ((a))

    3, 5, 7, 9

  2. ((b))

    2, 4, 6, 9

  3. ((c))

    0, 3, 5, 7

  4. ((d))

    1, 5, 7, 8

Show Answer
Answer: ((a))

3, 5, 7, 9

145

At room temperature, the region in a PN junction diode where there are no mobile electrons or holes is called __________________.

  1. ((a))

    Depletion region

  2. ((b))

    P-type region

  3. ((c))

    N-type region

  4. ((d))

    Ohmic terminal interface

Show Answer
Answer: ((a))

Depletion region

146

The output of the phase detector in a phase-locked loop is ____________.

  1. ((a))

    Zero when the phase detector finds the input and oscillator phases are perfectly aligned.

  2. ((b))

    An alternating current signal when the phase detector locks the loop.

  3. ((c))

    A maximum constant voltage when the phase detector is in a free-running state.

  4. ((d))

    A proportional error voltage when the phase detector identifies a phase difference between input and the VCO signal

Show Answer
Answer: ((a))

Zero when the phase detector finds the input and oscillator phases are perfectly aligned.

147

Under forward-bias conditions, what is the primary mechanism that creates forward current across a PN junction?

  1. ((a))

    The millions of protons creation inside the depletion region

  2. ((b))

    The drift of majority carriers due to the enhanced internal barrier electric field.

  3. ((c))

    The freezing of movement for free electrons across the metallurgical junction.

  4. ((d))

    Majority carriers crossing the junction to become injected minority carriers that diffuse through the neutral regions

Show Answer
Answer: ((a))

The millions of protons creation inside the depletion region

148

Which protocol is responsible for delivering web pages over the Internet?

  1. ((a))

    FTP

  2. ((b))

    SMTP

  3. ((c))

    HTTP

  4. ((d))

    ARP

Show Answer
Answer: ((a))

FTP

149

In a CRO time-base circuit, why is constant-current charging preferred for generating the sweep voltage?

  1. ((a))

    It relies on the transistor's collector current to set the linearity

  2. ((b))

    It makes the retrace interval longer than the sweep interval

  3. ((c))

    It causes the capacitor voltage to rise exponentially with time, distorting the sweep

  4. ((d))

    It ensures the capacitor voltage rises uniformly over time, forming a linear sweep

Show Answer
Answer: ((a))

It relies on the transistor's collector current to set the linearity

150

A coil is placed in a uniform magnetic field. If the area of the coil is doubled while the magnetic field strength and orientation remain unchanged, how will the magnetic flux through the coil be affected assuming the initial magnetic flux is a non-zero finite value?

  1. ((a))

    The magnetic flux will double

  2. ((b))

    The magnetic flux will become four times

  3. ((c))

    The magnetic flux will decrease to half

  4. ((d))

    The magnetic flux will remain the same

Show Answer
Answer: ((a))

The magnetic flux will double

Attempt this paper under real exam conditions

Timed interface, section switching, instant scoring, and question-by-question analytics — free.

Start Timed Attempt