Official Paper

RRB JE EE 22 Apr 2025 Shift 2 CBT 2 Official Paper (Previous Year Paper)

150 questions · 120 minutes · with answers · free

Attempt as Timed Mock Test

General Abilities (50 questions)

1

Which of the following CANNOT be considered as a measure to control global warming?

  1. ((a))

    Efficiently using energy

  2. ((b))

    Cutting down use of fossil fuel

  3. ((c))

    Reduction in emission of greenhouse gases

  4. ((d))

    Causing deforestation

Show Answer
Answer: ((a))

Efficiently using energy

2

What is the maximum number of Ministers allowed in the Council of Ministers, including the Prime Minister, as per the 91st Amendment Act?

  1. ((a))

    12% of Lok Sabha strength

  2. ((b))

    10% of Lok Sabha strength

  3. ((c))

    15% of Lok Sabha strength

  4. ((d))

    20% of Lok Sabha strength

Show Answer
Answer: ((a))

12% of Lok Sabha strength

3

What is the net force acting on an object if balanced forces are applied?

  1. ((a))

    Equal to the mass of the object

  2. ((b))

    Zero

  3. ((c))

    Equal to acceleration

  4. ((d))

    Infinite

Show Answer
Answer: ((a))

Equal to the mass of the object

4

Which of the following is NOT a source of release of smokestacks?

  1. ((a))

    Rivers

  2. ((b))

    Smelters

  3. ((c))

    Thermal power plants

  4. ((d))

    Industries

Show Answer
Answer: ((a))

Rivers

5

What is the primary purpose of using a firewall on a Personal Computer?

  1. ((a))

    To increase storage space

  2. ((b))

    To block unauthorised access and protect the computer

  3. ((c))

    To clean up temporary files

  4. ((d))

    To speed up internet connectivity

Show Answer
Answer: ((a))

To increase storage space

6

The energy that is derived from the use of radioactive isotopes is termed as _________.

  1. ((a))

    thermal energy

  2. ((b))

    solar energy

  3. ((c))

    geothermal energy

  4. ((d))

    nuclear energy

Show Answer
Answer: ((a))

thermal energy

7

The fine powder that is obtained from the modified and recycled form of plastic is called

_______.

  1. ((a))

    polyblend

  2. ((b))

    polystyrene

  3. ((c))

    polyethylene

  4. ((d))

    polythene

Show Answer
Answer: ((a))

polyblend

8

Which of the following is NOT toxic to non-target organisms in the soil?

  1. ((a))

    Organic fertilisers

  2. ((b))

    Pesticides

  3. ((c))

    Herbicides

  4. ((d))

    Fungicides

Show Answer
Answer: ((a))

Organic fertilisers

9

What does PCB stand for?

  1. ((a))

    Processing Circuit Board

  2. ((b))

    Peripheral Connection Bus

  3. ((c))

    Primary Control Board

  4. ((d))

    Printed Circuit Board

Show Answer
Answer: ((a))

Processing Circuit Board

10

Which of the following is NOT a component of a CPU?

  1. ((a))

    Arithmetic Logic Unit (ALU)

  2. ((b))

    Hard Disk

  3. ((c))

    Cache Memory

  4. ((d))

    Control Unit (CU)

Show Answer
Answer: ((a))

Arithmetic Logic Unit (ALU)

11

In which of the following regions the Himalayas has the greatest width?

  1. ((a))

    Sikkim

  2. ((b))

    Kashmir

  3. ((c))

    Himachal Pradesh

  4. ((d))

    Arunachal Pradesh

Show Answer
Answer: ((a))

Sikkim

12

Which official in the Gupta administration was responsible for peace and war matters?

  1. ((a))

    Vishayapati

  2. ((b))

    Sandhi-Vigrahika

  3. ((c))

    Mahapratihara

  4. ((d))

    Mahadandanayaka

Show Answer
Answer: ((a))

Vishayapati

13

Which of the following is a characteristic difference between colloids and true solutions?

  1. ((a))

    True solutions have visible solute particles, whereas colloids have invisible dispersed particles.

  2. ((b))

    True solutions have a single-phase system, whereas colloids have a two phase system.

  3. ((c))

    True solutions exhibit Brownian motion, but colloids do not.

  4. ((d))

    True solutions show the Tyndall effect, but colloids do not.

Show Answer
Answer: ((a))

True solutions have visible solute particles, whereas colloids have invisible dispersed particles.

14

Which of the following cities hosted the inaugural Kho Kho World Cup in January 2025?

  1. ((a))

    Chennai

  2. ((b))

    New Delhi

  3. ((c))

    Mumbai

  4. ((d))

    Kolkata

Show Answer
Answer: ((a))

Chennai

15

The primary agent that helps in the decomposition of biodegradable matter in domestic sewage is __________.

  1. ((a))

    chloride

  2. ((b))

    nitrate

  3. ((c))

    bacterium

  4. ((d))

    phosphate

Show Answer
Answer: ((a))

chloride

16

What is the first step to securing ones smartphone or tablet?

  1. ((a))

    Setting a password/PIN-protected lock screen

  2. ((b))

    Turning off mobile data

  3. ((c))

    Using only free Wi-Fi networks

  4. ((d))

    Installing more apps

Show Answer
Answer: ((a))

Setting a password/PIN-protected lock screen

17

What is the approximate pH of a neutral salt solution?

  1. ((a))

    Less than 7

  2. ((b))

    Depends on the temperature

  3. ((c))

    More than 7

  4. ((d))

    Equal to 7

Show Answer
Answer: ((a))

Less than 7

18

Why does a bee sting cause pain and irritation?

  1. ((a))

    The sting releases carbon dioxide gas.

  2. ((b))

    The sting injects a mild sugar solution.

  3. ((c))

    The sting injects methanoic acid.

  4. ((d))

    The sting contains a strong base.

Show Answer
Answer: ((a))

The sting releases carbon dioxide gas.

19

If you want the primary recipient to see that others have received a copy of an email, you should enter their email addresses in the ______ field.

  1. ((a))

    Bcc

  2. ((b))

    Cc

  3. ((c))

    Subject

  4. ((d))

    To

Show Answer
Answer: ((a))

Bcc

20

What is the purpose of the Collation option in the Print settings?

  1. ((a))

    To print all the pages of a document as a set

  2. ((b))

    To select a custom print range

  3. ((c))

    To adjust the page orientation

  4. ((d))

    To change the printer selection

Show Answer
Answer: ((a))

To print all the pages of a document as a set

21

The Rudra Veena is predominantly associated with which genre of Hindustani music?

  1. ((a))

    Thumri

  2. ((b))

    Dhrupad

  3. ((c))

    Khayal

  4. ((d))

    Ghazal

Show Answer
Answer: ((a))

Thumri

22

Which of the following correctly represents the chemical formula of a compound formed by aluminium and sulphate ions?

  1. ((a))

    Al(SO4)3

  2. ((b))

    Al2SO4

  3. ((c))

    Al2(SO4)3

  4. ((d))

    Al3(SO4)2

Show Answer
Answer: ((a))

Al(SO4)3

23

Which of the following states is NOT covered under the Atal Bhujal Yojana?

  1. ((a))

    Maharashtra

  2. ((b))

    Rajasthan

  3. ((c))

    Jharkhand

  4. ((d))

    Uttar Pradesh

Show Answer
Answer: ((a))

Maharashtra

24

The phenomenon of multiple echoes due to repeated reflections is called ___________.

  1. ((a))

    resonance

  2. ((b))

    refraction

  3. ((c))

    diffraction

  4. ((d))

    reverberation

Show Answer
Answer: ((a))

resonance

25

If the absolute refractive index of a medium is less than 1, it means ________.

  1. ((a))

    light travels faster in that medium than in vacuum

  2. ((b))

    the medium is a perfect reflector

  3. ((c))

    the medium absorbs all light

  4. ((d))

    light travels slower in that medium than in vacuum

Show Answer
Answer: ((a))

light travels faster in that medium than in vacuum

26

The Millennium Development Goals (MDGs) aimed to reduce extreme poverty by which year?

  1. ((a))

    2008

  2. ((b))

    2015

  3. ((c))

    2005

  4. ((d))

    2014

Show Answer
Answer: ((a))

2008

27

Which defect of vision occurs due to the weakening of ciliary muscles with age?

  1. ((a))

    Astigmatism

  2. ((b))

    Hypermetropia

  3. ((c))

    Myopia

  4. ((d))

    Presbyopia

Show Answer
Answer: ((a))

Astigmatism

28

Which state of matter shows the highest expansion when temperature is increased?

  1. ((a))

    Solids

  2. ((b))

    Gases

  3. ((c))

    Liquids

  4. ((d))

    Plasma

Show Answer
Answer: ((a))

Solids

29

What is the primary function of the F4 key in MS Excel when editing a cell reference in a formula?

  1. ((a))

    Opens the Find and Replace dialog

  2. ((b))

    Toggles between absolute and relative references

  3. ((c))

    Repeats the last action

  4. ((d))

    Refreshes the worksheet

Show Answer
Answer: ((a))

Opens the Find and Replace dialog

30

The main use of chlorofluorocarbons is in __________.

  1. ((a))

    smog

  2. ((b))

    chimneys

  3. ((c))

    refrigerants

  4. ((d))

    vehicles

Show Answer
Answer: ((a))

smog

31

Which of the following is the correct way to insert a new column in a spreadsheet?

  1. ((a))

    Go to Home > Insert > Insert Sheet Columns.

  2. ((b))

    Go to File > New > Column.

  3. ((c))

    Use Ctrl + Z to insert a column.

  4. ((d))

    Press Ctrl + X and then Insert.

Show Answer
Answer: ((a))

Go to Home > Insert > Insert Sheet Columns.

32

What is the shortcut key to start a slideshow from the beginning?

  1. ((a))

    F5

  2. ((b))

    Alt + Tab

  3. ((c))

    Shift + F5

  4. ((d))

    Ctrl + P

Show Answer
Answer: ((a))

F5

33

Which of the following companies announced plans in February 2025 to construct the world's longest undersea cable, aiming to enhance internet connectivity across five continents, with landing points in India?

  1. ((a))

    Amazon

  2. ((b))

    Meta

  3. ((c))

    Microsoft

  4. ((d))

    Google

Show Answer
Answer: ((a))

Amazon

34

What is India's global military ranking in the 2025 Global Firepower (GFP) index?

  1. ((a))

    5th

  2. ((b))

    2nd

  3. ((c))

    4th

  4. ((d))

    3rd

Show Answer
Answer: ((a))

5th

35

What happens when an acid reacts with a metal oxide?

  1. ((a))

    Only salt is formed.

  2. ((b))

    A salt and hydrogen gas are formed.

  3. ((c))

    A salt and water are formed.

  4. ((d))

    Only water is formed.

Show Answer
Answer: ((a))

Only salt is formed.

36

Dr. BR Ambedkar described which part of the Indian Constitution as its ‘novel features', while Granville Austin referred to it as the ‘Conscience of the Constitution’?

  1. ((a))

    Directive Principles of State Policy

  2. ((b))

    Fundamental Rights

  3. ((c))

    Preamble

  4. ((d))

    Fundamental Duties

Show Answer
Answer: ((a))

Directive Principles of State Policy

37

If an object is dropped from rest, what will be its velocity after 15 seconds? (g = 9.8 m/s2)

  1. ((a))

    143 m/s

  2. ((b))

    149 m/s

  3. ((c))

    145 m/s

  4. ((d))

    147 m/s

Show Answer
Answer: ((a))

143 m/s

38

What happens when a computer is put into Sleep mode?

  1. ((a))

    It shuts down completely.

  2. ((b))

    It stores data on the hard drive and powers off.

  3. ((c))

    It restarts automatically after a few minutes.

  4. ((d))

    It keeps the session active in RAM while using minimal power.

Show Answer
Answer: ((a))

It shuts down completely.

39

The glass panel used in greenhouses is known to retain ________.

  1. ((a))

    humidity

  2. ((b))

    heat

  3. ((c))

    pH

  4. ((d))

    rainfall

Show Answer
Answer: ((a))

humidity

40

Inertia depends on which property of an object?

  1. ((a))

    Shape

  2. ((b))

    Acceleration

  3. ((c))

    Velocity

  4. ((d))

    Mass

Show Answer
Answer: ((a))

Shape

41

The practice of Jhum cultivation is prevalent in the __________.

  1. ((a))

    South west

  2. ((b))

    North west

  3. ((c))

    North east

  4. ((d))

    South east

Show Answer
Answer: ((a))

South west

42

Which of the following correctly explains why clothes dry faster on a windy day?

  1. ((a))

    Wind decreases the temperature of the water molecules.

  2. ((b))

    Wind removes the water vapour from the clothes’ surroundings.

  3. ((c))

    Wind increases the humidity around the clothes.

  4. ((d))

    Wind reduces the surface area of the clothes.

Show Answer
Answer: ((a))

Wind decreases the temperature of the water molecules.

43

The maximum sound is generated _________.

  1. ((a))

    from vehicular emissions

  2. ((b))

    from house chimneys

  3. ((c))

    from industrial smoke

  4. ((d))

    by the take off of a jet plane

Show Answer
Answer: ((a))

from vehicular emissions

44

Identify the correct formula for the compound formed between Mg2+ and PO43− ions.

  1. ((a))

    Mg(PO4)3

  2. ((b))

    Mg3(PO4)2

  3. ((c))

    Mg2(PO4)3

  4. ((d))

    MgPO4

Show Answer
Answer: ((a))

Mg(PO4)3

45

What was the main objective of the Extremists during the Indian National Movement?

  1. ((a))

    To attain complete independence (Swaraj)

  2. ((b))

    To promote British goods in India

  3. ((c))

    To expand the legislative councils

  4. ((d))

    To bring social reforms

Show Answer
Answer: ((a))

To attain complete independence (Swaraj)

46

According to the Tendulkar methodology, what was the estimated percentage of people below the poverty line in rural areas in 2011-12?

  1. ((a))

    27.5%

  2. ((b))

    20%

  3. ((c))

    25.7%

  4. ((d))

    15.5%

Show Answer
Answer: ((a))

27.5%

47

The Industrial Policy Resolution of 1956 categorised industries into how many groups?

  1. ((a))

    Five

  2. ((b))

    Three

  3. ((c))

    Nine

  4. ((d))

    Seven

Show Answer
Answer: ((a))

Five

48

Which Article provides Ministers the right to participate in parliamentary proceedings but without voting rights?

  1. ((a))

    Article 88

  2. ((b))

    Article 78

  3. ((c))

    Article 53

  4. ((d))

    Article 77

Show Answer
Answer: ((a))

Article 88

49

In an electric circuit, what is the correct way to connect an ammeter?

  1. ((a))

    In either series or parallel

  2. ((b))

    In parallel with the component

  3. ((c))

    In series with the component

  4. ((d))

    In parallel with the source

Show Answer
Answer: ((a))

In either series or parallel

50

Who among the following inaugurated the 38th National Games held in Dehradun in January 2025?

  1. ((a))

    Narendra Modi

  2. ((b))

    Pushkar Singh Dhami

  3. ((c))

    Anurag Thakur

  4. ((d))

    Droupadi Murmu

Show Answer
Answer: ((a))

Narendra Modi

Technical Abilities (100 questions)

51

Which transmission voltage level is commonly used for bulk power transmission over medium distances?

  1. ((a))

    Ultra-High Voltage (UHV)

  2. ((b))

    Medium Voltage (MV) 

  3. ((c))

    Low Voltage (LV)

  4. ((d))

    High Voltage (HV)

Show Answer
Answer: ((a))

Ultra-High Voltage (UHV)

52

A 3-phase, 10 kV distribution line delivers power to a load at a 0.8 power factor lagging. If the current is 50 A, and the load resistance and reactance per km are 0.15 Ω and 0.2 Ω, respectively, for a 400 m line, what is the approximate voltage drop per phase (in V/phase)?

  1. ((a))

    0 + j10 

  2. ((b))

    1 + j10

  3. ((c))

    4.8 + j1.4

  4. ((d))

    1 + j5 

Show Answer
Answer: ((a))

0 + j10 

53

Which of the following are the two major elements required for Resistance Welding?

  1. ((a))

    Arc and time

  2. ((b))

    Current and pressure

  3. ((c))

    Current and resistance

  4. ((d))

    Arc and pressure

Show Answer
Answer: ((a))

Arc and time

54

Identify the correct statement related to the P-N junction diode.

  1. ((a))

    The forward current of the diode is equal to reverse saturation current of the diode.

  2. ((b))

    The forward current of the diode is greater than reverse saturation current of the diode.

  3. ((c))

    The reverse saturation current of the diode is always zero

  4. ((d))

    The forward current of the diode is less than the reverse saturation current of the diode.

Show Answer
Answer: ((a))

The forward current of the diode is equal to reverse saturation current of the diode.

55

Arrange the circuits in ascending order as per the number of diodes required to realise the circuit.

a. Full wave bride rectifier circuit

b. Half wave rectifier circuit

c. Centre tapped full wave rectifier circuit

  1. ((a))

    b-c-a

  2. ((b))

    a-c-b

  3. ((c))

    c-a-b

  4. ((d))

    a-b-c

Show Answer
Answer: ((a))

b-c-a

56

Which of the following is NOT correct when high-voltage leads are eliminated in potential transformer (PT) bushings?

  1. ((a))

    Decreases size and weight of the PT

  2. ((b))

    Increases the risk of short circuits

  3. ((c))

    Measures line-to-ground voltages in a three-phase system

  4. ((d))

    Reduces overall cost of the transformer

Show Answer
Answer: ((a))

Decreases size and weight of the PT

57

Which of the following modifications increases the ratio of full load torque to maximum torque in an induction motor?

  1. ((a))

    Decreasing supply voltage

  2. ((b))

    Decreasing rotor resistance

  3. ((c))

    Increasing stator resistance

  4. ((d))

    Increasing rotor resistance

Show Answer
Answer: ((a))

Decreasing supply voltage

58

According to Lenz’s law, what does the secondary current in a transformer produce?

  1. ((a))

     A magnetizing effect

  2. ((b))

    An EMF to oppose the primary voltage

  3. ((c))

    A back EMF that resists the load 

  4. ((d))

    A demagnetizing effect

Show Answer
Answer: ((a))

 A magnetizing effect

59

From the right-hand rule, if we know the direction of magnetic field encircling a conductor or the magnetic polarity of a coil, we can determine the:

  1. ((a))

    direction of MMF

  2. ((b))

    direction of flux

  3. ((c))

    direction of EMF 

  4. ((d))

    direction of current

Show Answer
Answer: ((a))

direction of MMF

60

Energy stored in an inductor is given by: (Given L is inductance, I is current, N is number of turns of coil, A is area of cross section, μ is permeability of flux and Φ is flux) 

  1. ((a))

    μN2AL\rm \frac{\mu N^2A}{L}

  2. ((b))

    Ldidt\rm L\frac{di}{dt}

  3. ((c))

    NΦI\rm \frac{N\Phi}{I}

  4. ((d))

    12LI2\rm \frac{1}{2}LI^2

Show Answer
Answer: ((a))

μN2AL\rm \frac{\mu N^2A}{L}

61

Increasing the resistance R in a parallel RLC circuit will _____. 

  1. ((a))

    increase resonance frequency

  2. ((b))

    increase the bandwidth 

  3. ((c))

    decrease the bandwidth 

  4. ((d))

    have no effect on bandwidth

Show Answer
Answer: ((a))

increase resonance frequency

62

Why do modern steam power plants use a regenerative feedwater heating system? 

  1. ((a))

    It helps improve efficiency by reusing heat, so less fuel is needed. 

  2. ((b))

    It helps keep turbine blades cooler. 

  3. ((c))

    It makes the combustion process more effective.

  4. ((d))

    It is mainly used to produce high-pressure steam. 

Show Answer
Answer: ((a))

It helps improve efficiency by reusing heat, so less fuel is needed. 

63

What is the primary characteristic of a Zener diode that distinguishes it from a regular diode?

  1. ((a))

    Sharp breakdown voltage and ability to regulate voltage 

  2. ((b))

    Low forward voltage drop

  3. ((c))

    High reverse breakdown voltage

  4. ((d))

    High forward current rating

Show Answer
Answer: ((a))

Sharp breakdown voltage and ability to regulate voltage 

64

In a Schering Bridge, if the known capacitor C2 = 500 pF, known resistor R3 = 5 kΩ, and the balancing resistor R4 = 1 MΩ, what is the value of the unknown capacitor Cx?

  1. ((a))

    10 pF

  2. ((b))

    100 nF

  3. ((c))

    50 pF 

  4. ((d))

    1 pF

Show Answer
Answer: ((a))

10 pF

65

What is a key factor in selecting street light pole structures?

  1. ((a))

    Focusing only on the aesthetic design of the pole. 

  2. ((b))

    The height, material, and durability to withstand environmental conditions.

  3. ((c))

    Ignoring wind load calculations to reduce costs.

  4. ((d))

    The colour of the pole.

Show Answer
Answer: ((a))

Focusing only on the aesthetic design of the pole. 

66

By which of the following is the welding current in an AC welding transformer controlled?

  1. ((a))

    Increasing the primary voltage

  2. ((b))

    Varying the magnetic flux

  3. ((c))

    Using an electric motor

  4. ((d))

    Changing the output current

Show Answer
Answer: ((a))

Increasing the primary voltage

67

Which of the following applications makes use of capacitor?

  1. ((a))

    Transformer

  2. ((b))

    Microwave

  3. ((c))

    Electric vehicle

  4. ((d))

    Toaster

Show Answer
Answer: ((a))

Transformer

68

For accurate voltage regulation calculation in a transformer, which of the following must remain constant?

  1. ((a))

    Output (secondary) voltage

  2. ((b))

    Core losses

  3. ((c))

    Load power factor

  4. ((d))

    Applied (primary) voltage 

Show Answer
Answer: ((a))

Output (secondary) voltage

69

In an inductor, if flux is maintained constant, ______________ EMF will be induced.

  1. ((a))

    no

  2. ((b))

    infinite

  3. ((c))

    positive

  4. ((d))

    negative

Show Answer
Answer: ((a))

no

70

How are outdoor streetlight installations typically classified?

  1. ((a))

    Based on the colour of the light fixtures

  2. ((b))

    Based on the cost of the light fixtures only

  3. ((c))

    Based on the aesthetic design of the poles

  4. ((d))

    Based on the type of light source, mounting height, and application (e.g., residential, highway, or industrial areas)

Show Answer
Answer: ((a))

Based on the colour of the light fixtures

71

What is the function of the armature core in relation to the magnetic circuit? 

  1. ((a))

    To cool the armature conductors

  2. ((b))

    To convert electrical energy into mechanical energy

  3. ((c))

    To ensure electrical conductors do not short-circuit 

  4. ((d))

    To complete the magnetic circuit through the yoke and poles 

Show Answer
Answer: ((a))

To cool the armature conductors

72

The Q-factor of a resonant circuit is 100. If the resonant frequency is 1 MHz, what is the bandwidth? 

  1. ((a))

    10 MHz 

  2. ((b))

    100 kHz

  3. ((c))

    1 kHz

  4. ((d))

    10 kHz

Show Answer
Answer: ((a))

10 MHz 

73

Self inductance of a coil is directly proportional to the: 

  1. ((a))

    flux and the current flowing in the coil

  2. ((b))

    current flowing in the coil only

  3. ((c))

    flux and number of turns of the coil

  4. ((d))

    number of turns and the current flowing in the coil 

Show Answer
Answer: ((a))

flux and the current flowing in the coil

74

In a parallel RLC circuit, if the inductive current IL is greater than the capacitive current IC, then ________.

  1. ((a))

    XC > XL

  2. ((b))

    XC = XL

  3. ((c))

    XC < XL

  4. ((d))

    circuit is at resonance

Show Answer
Answer: ((a))

XC > XL

75

In a street lighting ring network, what is the primary reason for considering voltage drop?

  1. ((a))

    To maximise current flow

  2. ((b))

    To decrease conductor resistance

  3. ((c))

    To increase power loss for efficiency 

  4. ((d))

    To ensure all lights receive equal brightness

Show Answer
Answer: ((a))

To maximise current flow

76

If the resistance (R) in a parallel RLC circuit increases, the quality factor (Q) will _______. 

  1. ((a))

    remain the same

  2. ((b))

    become zero

  3. ((c))

    decrease

  4. ((d))

    increase

Show Answer
Answer: ((a))

remain the same

77

Which of the following methods is NOT used for low resistance measurement? 

  1. ((a))

    Potentiometer method 

  2. ((b))

    Loss of Charge method

  3. ((c))

    Ammeter-Voltmeter method

  4. ((d))

    Kelvin Double Bridge method

Show Answer
Answer: ((a))

Potentiometer method 

78

What does the 'Rate of Rise of Restriking Voltage (RRRV)' in circuit breakers refer to?

  1. ((a))

    The rate at which the voltage across the breaker contacts rises after current interruption

  2. ((b))

    The rate at which the fault current increases in the system

  3. ((c))

    The rate at which the breaker contacts close during normal operation

  4. ((d))

    The speed at which the circuit breaker operates during a fault 

Show Answer
Answer: ((a))

The rate at which the voltage across the breaker contacts rises after current interruption

79

How does the spear valve inside the nozzle enhance the operational efficiency of a Pelton turbine? 

  1. ((a))

    By dynamically adjusting the jet velocity to match load demand

  2. ((b))

    By diverting the water jet away from the buckets when needed

  3. ((c))

    By storing excess kinetic energy for later use

  4. ((d))

    By creating turbulence to improve energy dissipation 

Show Answer
Answer: ((a))

By dynamically adjusting the jet velocity to match load demand

80

Which type of electrode is used in Carbon Arc Welding (CAW)? 

  1. ((a))

    Aluminum coated electrode

  2. ((b))

    Copper coated electrode

  3. ((c))

    Tungsten electrode

  4. ((d))

    Graphite electrode

Show Answer
Answer: ((a))

Aluminum coated electrode

81

Which gas is used to aid the starting process in Metal Halide Lamps?

  1. ((a))

    Carbon dioxide

  2. ((b))

    Nitrogen

  3. ((c))

    Argon

  4. ((d))

    Neon

Show Answer
Answer: ((a))

Carbon dioxide

82

Which statements about the maximum power output of a cylindrical rotor synchronous generator are correct?

I. Maximum power output occurs when the load angle (δ) is 90°.

II. Maximum power is proportional to the square of the terminal voltage (V).

III. Over-excitation increases the generator’s maximum power capability.

IV. Maximum power is independent of the synchronous reactance (Xs).

  1. ((a))

    Statements I and III only are correct. 

  2. ((b))

    Statements II and IV only are correct.

  3. ((c))

    Statements II and III only are correct.

  4. ((d))

    Statements I and IV only are correct. 

Show Answer
Answer: ((a))

Statements I and III only are correct. 

83

What is the primary function of 'Percentage Differential Protection' in an alternator?

  1. ((a))

    To detect and protect against internal faults within the alternator windings 

  2. ((b))

    To detect and protect against external faults in the connected power system 

  3. ((c))

    To monitor the voltage regulation of the alternator 

  4. ((d))

    To protect against overloading of the alternator

Show Answer
Answer: ((a))

To detect and protect against internal faults within the alternator windings 

84

Crawling typically causes an induction motor to operate at a speed that is: 

  1. ((a))

    a fraction (e.g. 1/3) of synchronous speed

  2. ((b))

    double the synchronous speed

  3. ((c))

    equal to synchronous speed

  4. ((d))

    slightly below synchronous speed under full load

Show Answer
Answer: ((a))

a fraction (e.g. 1/3) of synchronous speed

85

The use of electronic ballasts in CFLs helps to eliminate: 

  1. ((a))

    slow starting and flickering

  2. ((b))

    overheating

  3. ((c))

    excessive brightness 

  4. ((d))

    high voltage consumption

Show Answer
Answer: ((a))

slow starting and flickering

86

If the number of parallel paths (A) in a DC generator is increased, the generated EMF will:

  1. ((a))

    decrease

  2. ((b))

    remain the same 

  3. ((c))

    increase

  4. ((d))

    become zero

Show Answer
Answer: ((a))

decrease

87

Why is the simple brake test generally used for small motors only?

  1. ((a))

    The simple brake test does not work with large motors.

  2. ((b))

    Large motors have lower efficiency. 

  3. ((c))

    Large motors produce excessive heat that is difficult to dissipate. 

  4. ((d))

    Small motors do not require cooling. 

Show Answer
Answer: ((a))

The simple brake test does not work with large motors.

88

In an alternator, if the load power factor changes from lagging to leading, the armature reaction effect shifts from:

  1. ((a))

    demagnetising to magnetising

  2. ((b))

    magnetising to cross-magnetising

  3. ((c))

    cross-magnetising to demagnetising

  4. ((d))

    demagnetising to cross-magnetising

Show Answer
Answer: ((a))

demagnetising to magnetising

89

What effect does excessive heat in a transformer have on its windings?

  1. ((a))

    It reduces insulation resistance and can cause damage. 

  2. ((b))

    It increases transformer efficiency. 

  3. ((c))

    It improves insulation performance.

  4. ((d))

    It has no significant effect.

Show Answer
Answer: ((a))

It reduces insulation resistance and can cause damage. 

90

The Buchholz relay is connected between which two parts of the transformer?

  1. ((a))

    Magnetic core and armature

  2. ((b))

    Primary terminal and secondary terminal

  3. ((c))

    Transformer oil tank and conservator tank 

  4. ((d))

    Primary winding and secondary winding

Show Answer
Answer: ((a))

Magnetic core and armature

91

In a transistor amplifier, the composition of the current in any branch during operation is:

  1. ((a))

    the sum of AC and DC

  2. ((b))

    DC only

  3. ((c))

    AC only

  4. ((d))

    the multiplication of AC and DC

Show Answer
Answer: ((a))

the sum of AC and DC

92

If the capacitance in a series RLC circuit is increased, the Q-factor will _________.

  1. ((a))

    increase

  2. ((b))

    decrease

  3. ((c))

    remain unchanged

  4. ((d))

    depend on frequency 

Show Answer
Answer: ((a))

increase

93

The material commonly used as resistance wire in heating elements is:

  1. ((a))

    copper

  2. ((b))

    aluminium

  3. ((c))

    nichrome

  4. ((d))

    silver

Show Answer
Answer: ((a))

copper

94

The RMS value of voltage (Vrms) in a purely resistive AC circuit is related to peak voltage (Vm) by ______.

  1. ((a))

    Vrrms=2Vm\rm V_{rrms}=\frac{\sqrt2}{V_m}

  2. ((b))

    Vrms = √2 Vm

  3. ((c))

    Vrrms=Vm2\rm V_{rrms}=\frac{V_m}{\sqrt2}

  4. ((d))

    Vrms = Vm

Show Answer
Answer: ((a))

Vrrms=2Vm\rm V_{rrms}=\frac{\sqrt2}{V_m}

95

Under constant mechanical load, changing the excitation of a synchronous motor affects which of the following?

I. Power factor

II. Armature current magnitude

III. Speed of the motor IV. Real power output

  1. ((a))

    I and IV only

  2. ((b))

    I and II only 

  3. ((c))

    II and III only

  4. ((d))

    III and IV only

Show Answer
Answer: ((a))

I and IV only

96

What is the angle that is formed between the incident ray and the normal line called?

  1. ((a))

    Angle of deviation

  2. ((b))

    Angle of incidence

  3. ((c))

    Angle of refraction

  4. ((d))

    Angle of reflection

Show Answer
Answer: ((a))

Angle of deviation

97

An apartment complex consists of 15 apartments, each with a peak demand of 8 kW. The maximum system demand recorded is 60 kW. What is the diversity factor?

  1. ((a))

    0.5

  2. ((b))

    3

  3. ((c))

    1.5

  4. ((d))

    2

Show Answer
Answer: ((a))

0.5

98

Which type of damping is commonly used in PMMC voltmeters and ammeters?

  1. ((a))

    Spring-controlled damping

  2. ((b))

    Electromagnetic damping

  3. ((c))

    Air friction damping 

  4. ((d))

    Fluid friction damping

Show Answer
Answer: ((a))

Spring-controlled damping

99

A toroidal coil has a magnetic path length of 30 cm and a magnetic field strength of 750 A/m. The coil current is 250 mA. Determine the number of coil turns.

  1. ((a))

    900 turns

  2. ((b))

    800 turns 

  3. ((c))

    750 turns

  4. ((d))

    625 turns 

Show Answer
Answer: ((a))

900 turns

100

A single-phase AC circuit has a voltage of 230 V and a current of 10 A. What is the apparent power (S)?

  1. ((a))

    2.3 kVA

  2. ((b))

    2.3 kW

  3. ((c))

    23 VA

  4. ((d))

    2300 VAR

Show Answer
Answer: ((a))

2.3 kVA

101

In the fabrication of a PNP transistor, what is the primary reason for using a buried layer of heavily doped P+ material beneath the N-type base region?

  1. ((a))

    To increase the emitter injection efficiency

  2. ((b))

    To reduce the base-emitter voltage 

  3. ((c))

    To reduce the collector-emitter saturation voltage 

  4. ((d))

    To prevent latchup and improve transistor stability

Show Answer
Answer: ((a))

To increase the emitter injection efficiency

102

M.M.F in a magnetic circuit is abbreviated as:

  1. ((a))

    Magnetic Force 

  2. ((b))

     Magnetomotive Field

  3. ((c))

    Magnetic Movement Field

  4. ((d))

    Magnetomotive Force

Show Answer
Answer: ((a))

Magnetic Force 

103

Which safety factor is most important when designing transmission lines under ice and wind conditions?

  1. ((a))

    Thermal expansion factor

  2. ((b))

    Electrical safety factor

  3. ((c))

    Mechanical stress factor

  4. ((d))

    Magnetic field factor

Show Answer
Answer: ((a))

Thermal expansion factor

104

If a residential area has an annual energy consumption of 28,908,000 kWh, what is its average demand? 

  1. ((a))

    3300 kWh

  2. ((b))

    2200 kWh

  3. ((c))

    3000 kWh

  4. ((d))

    3 kWh

Show Answer
Answer: ((a))

3300 kWh

105

The work done on a unit N pole in moving once around any single closed path in a magnetic field is equal to ___________. 

  1. ((a))

    EMF in respective path

  2. ((b))

    number of turns in respective path 

  3. ((c))

    Ampere turns linked with the path 

  4. ((d))

    current in respective path

Show Answer
Answer: ((a))

EMF in respective path

106

Why is a radial layout with high voltage drop unsuitable for industrial loads?

  1. ((a))

    It reduces voltage fluctuation.

  2. ((b))

    Voltage drop increases system reliability.

  3. ((c))

    It helps maintain constant power factor.

  4. ((d))

    Industrial loads require stable voltage level

Show Answer
Answer: ((a))

It reduces voltage fluctuation.

107

What is the relationship between back EMF and the supply voltage in a DC motor?

  1. ((a))

    Back EMF is directly proportional to the supply voltage.

  2. ((b))

    Back EMF is equal to the supply voltage.

  3. ((c))

    Back EMF is independent of the supply voltage. 

  4. ((d))

    Back EMF opposes the supply voltage. 

Show Answer
Answer: ((a))

Back EMF is directly proportional to the supply voltage.

108

In a series magnetic circuit, ___________ flux φ flows through each part of the circuit.

  1. ((a))

    the same

  2. ((b))

    different

  3. ((c))

    zero

  4. ((d))

    infinite

Show Answer
Answer: ((a))

the same

109

Which type of transformer is used for stepping down current for measurement purposes?

  1. ((a))

    Current transformer

  2. ((b))

    Power transformer 

  3. ((c))

    Voltage transformer 

  4. ((d))

    Auto transformer

Show Answer
Answer: ((a))

Current transformer

110

What will be the current relationship in time domain for a capacitive circuit?

  1. ((a))

    Cd2vdt2\rm C\frac{d^2v}{dt^2}

  2. ((b))

    i(t)=Cdvdt\rm i(t)=C\frac{dv}{dt}

  3. ((c))

    i(t)=C∫0tv(t)\rm i(t)=C\int_0^tv(t)

  4. ((d))

    i(t)=C∫0tv(t)+i(0)\rm i(t)=C\int_0^tv(t)+i(0)

Show Answer
Answer: ((a))

Cd2vdt2\rm C\frac{d^2v}{dt^2}

111

For the full wave rectifier circuit with sinusoidal ac signal as its input, if the peak value of the output signal increases, its rms value of the ac component __________. 

  1. ((a))

    increases

  2. ((b))

    decreases

  3. ((c))

    remains the same 

  4. ((d))

    becomes zero 

Show Answer
Answer: ((a))

increases

112

What is a key consideration in public lighting installations?

  1. ((a))

    Providing adequate illumination while ensuring energy efficiency and safety

  2. ((b))

    Ignoring maintenance requirements to reduce costs

  3. ((c))

    Focusing only on the aesthetic design of the light fixtures

  4. ((d))

    Ensuring the lighting system operates without any protective devices

Show Answer
Answer: ((a))

Providing adequate illumination while ensuring energy efficiency and safety

113

For a P-N junction diode, the built in barrier potential of the junction is __________ proportional to the doping concentration and _________ proportional to the intrinsic concentration

  1. ((a))

    inversely; directly 

  2. ((b))

    inversely; inversely

  3. ((c))

    directly; inversely

  4. ((d))

    directly; directly

Show Answer
Answer: ((a))

inversely; directly 

114

The same polarity condition is essential in parallel operation because: 

  1. ((a))

    it increases the transformer efficiency

  2. ((b))

    it reduces the transformer losses

  3. ((c))

    it helps with voltage regulation

  4. ((d))

    it ensures that the transformers are not damaged due to reverse currents

Show Answer
Answer: ((a))

it increases the transformer efficiency

115

Which of the following is a major disadvantage of the De Sauty Bridge?

  1. ((a))

    It does not consider the dielectric losses in capacitors. 

  2. ((b))

    It requires both resistors and inductors for balance. 

  3. ((c))

    It cannot be used to measure very small capacitances.

  4. ((d))

    It requires an AC power source

Show Answer
Answer: ((a))

It does not consider the dielectric losses in capacitors. 

116

Which application is a common use of synchronous motors? 

  1. ((a))

    Electric cranes

  2. ((b))

    Power factor correction 

  3. ((c))

    Household fans

  4. ((d))

    Portable drills 

Show Answer
Answer: ((a))

Electric cranes

117

What is the primary purpose of 'Thermal Overheating Protection' in a transformer?

  1. ((a))

    To protect against overvoltage conditions in the power system

  2. ((b))

    To detect and protect against short circuits in the transformer windings

  3. ((c))

    To monitor and prevent excessive temperature rise in the transformer

  4. ((d))

    To detect faults in the transformer cooling system

Show Answer
Answer: ((a))

To protect against overvoltage conditions in the power system

118

Ferrites are ferromagnetic ceramics which have a fairly constant ____________. 

  1. ((a))

    relative permeability

  2. ((b))

    magnetic susceptibility

  3. ((c))

    hysteresis loss 

  4. ((d))

    frequency response

Show Answer
Answer: ((a))

relative permeability

119

Find the voltage Vs in the circuit by using Kirchoff's Voltage Law. 

  1. ((a))

    10 V

  2. ((b))

    20 V

  3. ((c))

    30 V

  4. ((d))

    50 V

Show Answer
Answer: ((a))

10 V

120

Which of the following is a key requirement of a protective relay in terms of reliability?

  1. ((a))

    The relay must operate only when a fault occurs and remain stable during normal conditions

  2. ((b))

    The relay must have a complex design to handle multiple fault types. 

  3. ((c))

    The relay must reset immediately after a fault is cleared.

  4. ((d))

    The relay must operate with a significant time delay to ensure coordination. 

Show Answer
Answer: ((a))

The relay must operate only when a fault occurs and remain stable during normal conditions

121

Which of the following is a fundamental principle for electrical installations, according to safety standards?

  1. ((a))

    Electrical circuits must be designed to operate without any protective devices

  2. ((b))

    Electrical installations must ensure protection against electric shock, overcurrent and fault currents

  3. ((c))

    Electrical systems should prioritise cost over safety considerations

  4. ((d))

    Electrical installations do not require grounding or earthing systems

Show Answer
Answer: ((a))

Electrical circuits must be designed to operate without any protective devices

122

Which of the following best describes the role of a Time-of-Day (ToD) Tariff in energy conservation?

  1. ((a))

     It applies only to industrial consumers and has no impact on residential users.

  2. ((b))

    It eliminates the need for load management by ensuring a constant energy supply. 

  3. ((c))

    It increases electricity costs uniformly throughout the day, regardless of demand variations

  4. ((d))

    It encourages consumers to shift electricity usage to off-peak hours, reducing peak demand and improving grid efficiency. 

Show Answer
Answer: ((a))

 It applies only to industrial consumers and has no impact on residential users.

123

Compared to the MMF method, the EMF method is ___________.

  1. ((a))

    only used for DC generators

  2. ((b))

    less accurate due to assuming constant Zs

  3. ((c))

    more accurate due to accounting for saturation

  4. ((d))

    independent of load power factor

Show Answer
Answer: ((a))

only used for DC generators

124

In the equivalent circuit without core losses, the magnetising branch consists of __________. 

  1. ((a))

    Rc in parallel with Xm

  2. ((b))

    Xm in series with Rc

  3. ((c))

    Xm alone

  4. ((d))

    Rc alone

Show Answer
Answer: ((a))

Rc in parallel with Xm

125

Force on a current-carrying conductor will be _________ when it is placed at right angles to the direction of the magnetic field.

  1. ((a))

    minimum

  2. ((b))

    zero

  3. ((c))

    maximum 

  4. ((d))

    infinite

Show Answer
Answer: ((a))

minimum

126

Why are salient pole rotors NOT used in turbo alternators?

  1. ((a))

    Mechanical instability at high speeds

  2. ((b))

    Inefficient cooling

  3. ((c))

    High copper losses

  4. ((d))

    Low mechanical strength

Show Answer
Answer: ((a))

Mechanical instability at high speeds

127

If the frequency of an AC source connected to a pure capacitor is doubled, the capacitive reactance will ________.

  1. ((a))

    decrease by half

  2. ((b))

    double

  3. ((c))

    increase four times

  4. ((d))

    remain unchanged

Show Answer
Answer: ((a))

decrease by half

128

If the peak voltage of a full-wave rectifier is 20 V, what is the average output voltage?

  1. ((a))

    π20V\frac{\pi}{20}V

  2. ((b))

    π40V\frac{\pi}{40}V

  3. ((c))

    20πV\frac{20}{\pi}V

  4. ((d))

    40πV\frac{40}{\pi}V

Show Answer
Answer: ((a))

π20V\frac{\pi}{20}V

129

Maxwell’s Inductance-Capacitance Bridge uses a standard capacitor to measure which of the following? 

  1. ((a))

    Inductance

  2. ((b))

    High resistance 

  3. ((c))

    Capacitance

  4. ((d))

    Low resistance

Show Answer
Answer: ((a))

Inductance

130

A sinusoidal voltage is given by v(t)=100 sin(ωt+30°). What is the corresponding phasor representation?

  1. ((a))

    100 ∠ -30°

  2. ((b))

    100 ∠ 0°

  3. ((c))

    100 ∠ 90°

  4. ((d))

    100 ∠ 30°

Show Answer
Answer: ((a))

100 ∠ -30°

131

A parallel RLC circuit has an inductance of 1 H and a capacitance of 1 µF. What is the resonant frequency (f0 )?

  1. ((a))

    1π×10−3Hz\rm \frac{1}{\pi \times 10^{-3}}Hz

  2. ((b))

    1πHz\rm \frac{1}{\pi}Hz

  3. ((c))

    12πHz\rm \frac{1}{2\pi}Hz

  4. ((d))

    12π×10−3Hz\rm \frac{1}{2\pi \times 10^{-3}}Hz

Show Answer
Answer: ((a))

1π×10−3Hz\rm \frac{1}{\pi \times 10^{-3}}Hz

132

Which of the following factors determines the selection of voltage levels in primary and secondary transmission?

  1. ((a))

    Type of power generation used

  2. ((b))

    Only the type of transformers used

  3. ((c))

    Only the number of consumers connected

  4. ((d))

    Distance of transmission and power demand

Show Answer
Answer: ((a))

Type of power generation used

133

Current I(s) in RL circuit is given as I(s)=1.5s+4\rm I(s)=\frac{1.5}{s+4} Obtain i(t) for t > 0

  1. ((a))

    1.5 e4t

  2. ((b))

    1.5 e-4t

  3. ((c))

    1.5 t

  4. ((d))

    1.5 et

Show Answer
Answer: ((a))

1.5 e4t

134

In distribution transformers, the explosion vent is designed to:

  1. ((a))

    improve the cooling system

  2. ((b))

    control oil pressure

  3. ((c))

    release pressure in case of excessive buildup

  4. ((d))

    monitor transformer oil quality

Show Answer
Answer: ((a))

improve the cooling system

135

In a ring distribution system, if one section of the ring experiences a fault and is disconnected, how does this affect the voltage drop at the loads connected to the remaining operational sections?

  1. ((a))

    Voltage drop fluctuates randomly due to load redistribution. 

  2. ((b))

    Voltage drops decreases as the fault reduces overall system impedance.

  3. ((c))

    Voltage drop remains unchanged since power is still supplied from two directions.

  4. ((d))

    Voltage drops increases because the system now operates like a radial system in that section. 

Show Answer
Answer: ((a))

Voltage drop fluctuates randomly due to load redistribution. 

136

What does the flux created by the load current in the primary winding, which links only with the primary winding, represent?

  1. ((a))

    Induced flux

  2. ((b))

    Magnetic flux

  3. ((c))

    Leakage flux

  4. ((d))

    Mutual flux

Show Answer
Answer: ((a))

Induced flux

137

Which of the following is a characteristic of a group drive system?

  1. ((a))

    Minimal energy loss

  2. ((b))

    Low capital cost 

  3. ((c))

    High flexibility in operation

  4. ((d))

    High maintenance cost

Show Answer
Answer: ((a))

Minimal energy loss

138

If two AC waveforms have a phase difference of 0°, they are said to be _____. 

  1. ((a))

    lagging

  2. ((b))

    out of phase

  3. ((c))

    in phase

  4. ((d))

    leading

Show Answer
Answer: ((a))

lagging

139

Which statements about voltage drop in an alternator are correct?

I. The voltage drop due to armature resistance (IaRa) is in phase with the armature current (Ia).

II. At unity power factor, the voltage drop IaRa directly subtracts from the generated EMF (E).

III. For a leading power factor load, IaRa contributes to an increase in terminal voltage (V).

IV. Armature resistance has no effect on voltage regulation.

  1. ((a))

    Statements III and IV only are correct. 

  2. ((b))

    Statements I and II only are correct.

  3. ((c))

    Statements II and III only are correct.

  4. ((d))

    Statements I and IV only are correct.

Show Answer
Answer: ((a))

Statements III and IV only are correct. 

140

How are the segments of the commutator insulated from each other?

  1. ((a))

    Using thin layers of mica

  2. ((b))

    Using air gaps

  3. ((c))

    Using thick layers of rubber

  4. ((d))

    Using metal sheets

Show Answer
Answer: ((a))

Using thin layers of mica

141

Which of the following options best describes the role of a gasifier in an agro-chemicalbased power plant?

  1. ((a))

    It directly burns biomass to produce heat. 

  2. ((b))

    It converts solid biomass into a combustible gas through partial oxidation. 

  3. ((c))

    It stores chemical fertilisers for energy production. 

  4. ((d))

    It condenses steam to generate electricity. 

Show Answer
Answer: ((a))

It directly burns biomass to produce heat. 

142

If a 6-pole induction motor operates on a 60 Hz supply, its synchronous speed is _____________.

  1. ((a))

    7200 rpm

  2. ((b))

    1200 rpm

  3. ((c))

    2400 rpm

  4. ((d))

    3600 rpm

Show Answer
Answer: ((a))

7200 rpm

143

A diode rectifier circuit has an AC input voltage of 230 Vrms and a load resistance of 1 kΩ. If the diode is ideal and the circuit is a half-wave rectifier, what is the Peak Inverse Voltage (PIV) across the diode?

  1. ((a))

    230 V

  2. ((b))

    460 V

  3. ((c))

    325 V

  4. ((d))

    650 V

Show Answer
Answer: ((a))

230 V

144

Why does a single large generating unit lead to higher generating costs per unit?

  1. ((a))

    It eliminates the need for maintenance.

  2. ((b))

    It has zero fuel consumption. 

  3. ((c))

    It always operates at maximum efficiency. 

  4. ((d))

    It operates inefficiently during periods of low demand.

Show Answer
Answer: ((a))

It eliminates the need for maintenance.

145

What is the primary scope of the National Electric Code (NEC) 2011?

  1. ((a))

    To focus exclusively on renewable energy systems

  2. ((b))

    To define standards for power generation and transmission only

  3. ((c))

    To provide guidelines for the design and installation of electrical systems to ensure safety and reliability

  4. ((d))

    To regulate the manufacturing of electrical appliances and devices

Show Answer
Answer: ((a))

To focus exclusively on renewable energy systems

146

What is the reflection of light from a smooth and shiny surface like a mirror called?

  1. ((a))

    Spread reflection

  2. ((b))

    Irregular reflection

  3. ((c))

    Specular reflection

  4. ((d))

    Diffuse reflection

Show Answer
Answer: ((a))

Spread reflection

147

Which type of transformer is used for stepping down current for measurement purposes?

  1. ((a))

    Power transformer

  2. ((b))

    Auto transformer

  3. ((c))

    Current transformer

  4. ((d))

    Voltage transformer

Show Answer
Answer: ((a))

Power transformer

148

For a P-N junction diode, with increase in the reverse bias potential, the width of the depletion region ________ and the transition capacitance __________.

  1. ((a))

    increases; increases

  2. ((b))

    decreases; decreases

  3. ((c))

    decreases; increases

  4. ((d))

    increases; decreases

Show Answer
Answer: ((a))

increases; increases

149

Which of the following types of engines is most commonly adapted to run on liquid biomass fuels?

  1. ((a))

    Stirling engine

  2. ((b))

    Jet engine

  3. ((c))

    Fuel cell engine

  4. ((d))

    Internal combustion engine

Show Answer
Answer: ((a))

Stirling engine

150

In a three-phase system, the sum of the three phase voltage phasors in a balanced system is _____. 

  1. ((a))

    maximum at resonance

  2. ((b))

    zero

  3. ((c))

    equal to the line voltage

  4. ((d))

    equal to the phase voltage

Show Answer
Answer: ((a))

maximum at resonance

Attempt this paper under real exam conditions

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

Start Timed Attempt