Official Paper

RRB JE EE 22 Apr 2025 Shift 1 CBT 2 Official Paper (Previous Year Paper)

150 questions · 120 minutes · with answers · free

Attempt as Timed Mock Test

General Abilities (50 questions)

1

The people of ___________ were famously involved in execution of the Chipko movement.

  1. ((a))

    Gujarat

  2. ((b))

    Delhi

  3. ((c))

    Garhwal Himalayas

  4. ((d))

    Assam

Show Answer
Answer: ((a))

Gujarat

2

Why do covalent compounds generally have low melting and boiling points?

  1. ((a))

    They contain metallic bonds. 

  2. ((b))

    They have strong electrostatic forces. 

  3. ((c))

    They have a rigid lattice structure.

  4. ((d))

    They have weak intermolecular forces.

Show Answer
Answer: ((a))

They contain metallic bonds. 

3

Which of the following elements has an atomic number of 8?

  1. ((a))

    Hydrogen

  2. ((b))

    Nitrogen

  3. ((c))

    Carbon

  4. ((d))

    Oxygen

Show Answer
Answer: ((a))

Hydrogen

4

In an aquatic ecosystem, the phenomenon of biomagnification can best be studied in the case of _________.

  1. ((a))

    phosphates

  2. ((b))

    chlorine

  3. ((c))

    organochlorine

  4. ((d))

    DDT

Show Answer
Answer: ((a))

phosphates

5

Which function key is used to move text or graphics in a document? 

  1. ((a))

    F2

  2. ((b))

    F1

  3. ((c))

    F12

  4. ((d))

    F5

Show Answer
Answer: ((a))

F2

6

A ball of mass 50 grams is moving with a velocity of 15 m/s. What is its kinetic energy?

  1. ((a))

    3.750 J

  2. ((b))

    1.875 J

  3. ((c))

    5.625 J

  4. ((d))

    7.500 J

Show Answer
Answer: ((a))

3.750 J

7

In January 2025, India launched the NVS-02 satellite to strengthen which of the following navigation systems?

  1. ((a))

    Galileo

  2. ((b))

    Global Positioning System (GPS) 

  3. ((c))

    Navigation with Indian Constellation (NavIC)

  4. ((d))

    Global Navigation Satellite System (GLONASS)

Show Answer
Answer: ((a))

Galileo

8

Which of the following options is NOT a greenhouse gas?

  1. ((a))

    Methane

  2. ((b))

    Carbon tetrachloride

  3. ((c))

    Nitrous oxide

  4. ((d))

    Carbon dioxide

Show Answer
Answer: ((a))

Methane

9

The main reason for which we are dependent on air is our _____.

  1. ((a))

    osmoregulation

  2. ((b))

    excretion

  3. ((c))

    digestion

  4. ((d))

    respiration 

Show Answer
Answer: ((a))

osmoregulation

10

Which of the following was NOT an artisan guild during the Mauryan period?

మౌర్య కాలంలో ఈ క్రింది వాటిలో ఏది కళాకారుల సంఘం (artisan guild) కాదు?

  1. ((a))

    Astrologer / జ్యోతిష్యుడు

  2. ((b))

    Potters / కుమ్మరులు

  3. ((c))

    Carpenters / వడ్రంగులు

  4. ((d))

    Bankers and Merchants / బ్యాంకర్లు మరియు వ్యాపారులు

Show Answer
Answer: ((a))

Astrologer / జ్యోతిష్యుడు

11

Who among the following referred to the Directive Principles as the 'life-giving provisions' of the Constitution of India?

  1. ((a))

    Ivor Jennings

  2. ((b))

    BR Ambedkar

  3. ((c))

    HM Seervai

  4. ((d))

    LM Singhvi

Show Answer
Answer: ((a))

Ivor Jennings

12

What is the primary function of a firewall tool in a computer network?

  1. ((a))

    To speed up internet connections

  2. ((b))

    To monitor and control incoming and outgoing network traffic

  3. ((c))

    To store data securely

  4. ((d))

    To detect and remove viruses

Show Answer
Answer: ((a))

To speed up internet connections

13

The President has the power to dissolve which house of Parliament? 

  1. ((a))

    Lok Sabha only 

  2. ((b))

    Legislative Assembly

  3. ((c))

    Both Rajya Sabha and Lok Sabha

  4. ((d))

    Rajya Sabha only

Show Answer
Answer: ((a))

Lok Sabha only 

14

Who among the following developed the notation system for Hindustani classical music?

  1. ((a))

    Pandit Ravi Shankar

  2. ((b))

    Pandit Vishnu Narayan Bhatkhande

  3. ((c))

    Ustad Bismillah Khan

  4. ((d))

    Ustad Amjad Ali Khan

Show Answer
Answer: ((a))

Pandit Ravi Shankar

15

Which of the following MS Excel functions is used to convert a numeric value into a text with a specific format?

  1. ((a))

    NUMBERTOTEXT()

  2. ((b))

    VALUE()

  3. ((c))

    FORMAT()

  4. ((d))

    TEXT()

Show Answer
Answer: ((a))

NUMBERTOTEXT()

16

In which of the following events did Deepthi Jeevanji set a world record at the 2024 World Para Athletics Championships? 

  1. ((a))

    400 metres T20

  2. ((b))

    200 metres T20

  3. ((c))

    100 metres T20

  4. ((d))

    600 metres T20

Show Answer
Answer: ((a))

400 metres T20

17

A solution is prepared by dissolving 40 g of NaCl in 200 g of water. What is the mass per cent of NaCl in the solution? 

  1. ((a))

    45%

  2. ((b))

    16.67%

  3. ((c))

    20%

  4. ((d))

    25%

Show Answer
Answer: ((a))

45%

18

For the protection and improvement of the environmental quality, the Environment Protection Act came into force in the year _________.

  1. ((a))

    1984

  2. ((b))

    1992

  3. ((c))

    1986

  4. ((d))

    1972

Show Answer
Answer: ((a))

1984

19

Who among the following Indian female cricketers won the Best International Cricketer Award (Women) at the BCCI Naman Awards 2025?

  1. ((a))

    Smriti Mandhana

  2. ((b))

    Mithali Raj 

  3. ((c))

    Harmanpreet Kaur

  4. ((d))

    Jhulan Goswami 

Show Answer
Answer: ((a))

Smriti Mandhana

20

A concave lens has a focal length of −2 cm. What is its power?

  1. ((a))

    25 D

  2. ((b))

    −50 D

  3. ((c))

    −0.5 D

  4. ((d))

    0.5 D

Show Answer
Answer: ((a))

25 D

21

What does LAN stand for?

  1. ((a))

    Local Area Network

  2. ((b))

    Large Area Network

  3. ((c))

    Limited Access Node

  4. ((d))

    Linked Access Network

Show Answer
Answer: ((a))

Local Area Network

22

Radiations that are emitted from nuclear wastes are known to cause ________ at a high rate.

  1. ((a))

    diseases

  2. ((b))

    emotional defects

  3. ((c))

    mutations

  4. ((d))

    syndromes

Show Answer
Answer: ((a))

diseases

23

Which country proposed the idea of holding a United Nations conference on human interactions with the environment in 1968?

  1. ((a))

    United States

  2. ((b))

    Canada

  3. ((c))

    France

  4. ((d))

    Sweden

Show Answer
Answer: ((a))

United States

24

Which formula should be entered in cell C2 to multiply the values of cells A2 and B2 in Excel?

  1. ((a))

    =A2+B2

  2. ((b))

    =MULTIPLY(A2,B2)

  3. ((c))

    =A2*B2

  4. ((d))

    =A2-B2

Show Answer
Answer: ((a))

=A2+B2

25

An object is placed 15 cm in front of a convex lens of focal length 25 cm. The image distance will be ______. 

  1. ((a))

    −37.5 cm

  2. ((b))

    −10.0 cm

  3. ((c))

    −9.37 cm

  4. ((d))

    17.5 cm

Show Answer
Answer: ((a))

−37.5 cm

26

Due to global warming, the temperature of the earth has increased by ________

  1. ((a))

    0.8°C

  2. ((b))

    0.7°C

  3. ((c))

    0.6°C 

  4. ((d))

    0.5°C

Show Answer
Answer: ((a))

0.8°C

27

An alloy is considered a homogeneous mixture because:

  1. ((a))

    it contains two or more phases

  2. ((b))

    it exhibits uniform composition throughout

  3. ((c))

    its components can be separated by filtration

  4. ((d))

    its components are chemically combined in fixed proportions 

Show Answer
Answer: ((a))

it contains two or more phases

28

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

  1. ((a))

    Organic fertilisers

  2. ((b))

    Fungicides

  3. ((c))

    Herbicides 

  4. ((d))

    Pesticides

Show Answer
Answer: ((a))

Organic fertilisers

29

Which of the following bridges is constructed over the Brahmaputra River in India?

  1. ((a))

    Dhola-Sadiya Bridge

  2. ((b))

    Howrah Bridge

  3. ((c))

    Mahatma Gandhi Setu

  4. ((d))

    Pamban Bridge

Show Answer
Answer: ((a))

Dhola-Sadiya Bridge

30

Which German optical technology firm inaugurated its first Global Capability Centre in Bengaluru in November 2024, with plans to double its workforce within three years? 

  1. ((a))

    Jenoptik 

  2. ((b))

    Leica

  3. ((c))

    Schneider Kreuznach

  4. ((d))

    Carl Zeiss AG

Show Answer
Answer: ((a))

Jenoptik 

31

The kinetic energy of an object is derived using which of the following equations of motion?

  1. ((a))

    a = (v – u) / t

  2. ((b))

    s = ut + ½ at2

  3. ((c))

    v = u + at

  4. ((d))

    v2 – u2 = 2as

Show Answer
Answer: ((a))

a = (v – u) / t

32

What happens to the pH of pure water when a few drops of lemon juice are added?

  1. ((a))

    The pH increases 

  2. ((b))

    The pH remains the same

  3. ((c))

    The pH becomes neutral 

  4. ((d))

    The pH decreases 

Show Answer
Answer: ((a))

The pH increases 

33

Which of the following correctly differentiates mixtures and compounds?

FeatureMixtureCompound
A) SeparationCan be separated by physical methodsRequires chemical methods
B) CompositionFixed ratioVariable ratio
C) PropertiesAlways the same as constituentsDifferent from constituents
D) FormationBy chemical reactionBy simple mixing
  1. ((a))

    Option A (Separation) is correct 

  2. ((b))

    Option D (Formation) is correct

  3. ((c))

    Option B (Composition) is correct

  4. ((d))

    Option C (Properties) is correct 

Show Answer
Answer: ((a))

Option A (Separation) is correct 

34

What is the general orientation of the Himalayan ranges in the northwestern part of India?

  1. ((a))

    East-South

  2. ((b))

    Northeast to Southwest

  3. ((c))

    South-North

  4. ((d))

    Northwest to Southeast 

Show Answer
Answer: ((a))

East-South

35

What is the primary function of a computer firewall?

  1. ((a))

    To speed up internet connectivity

  2. ((b))

    To prevent unauthorised access to a private network

  3. ((c))

    To detect and remove computer viruses

  4. ((d))

    To store user passwords securely

Show Answer
Answer: ((a))

To speed up internet connectivity

36

Which operating system is known for its open-source nature and community-driven development for desktops and laptops?

  1. ((a))

    iOS

  2. ((b))

    macOS

  3. ((c))

    Windows

  4. ((d))

    Linux

Show Answer
Answer: ((a))

iOS

37

Which type of RAM is faster and DOES NOT require refreshing? 

  1. ((a))

    SRAM

  2. ((b))

    Dynamic Random Access Memory

  3. ((c))

    Flash Memory

  4. ((d))

    ROM

Show Answer
Answer: ((a))

SRAM

38

A sound wave with a low frequency will have _______.

  1. ((a))

    a low amplitude

  2. ((b))

    a short wavelength 

  3. ((c))

    a high pitch

  4. ((d))

    a low pitch

Show Answer
Answer: ((a))

a low amplitude

39

The power to issue an ordinance when Parliament is NOT in session is given to the President under which Article?

  1. ((a))

    Article 72

  2. ((b))

    Article 110

  3. ((c))

    Article 123

  4. ((d))

    Article 356

Show Answer
Answer: ((a))

Article 72

40

A metal wire is stretched, but it does not break easily. This property is known as:

  1. ((a))

    hardness

  2. ((b))

    ductility

  3. ((c))

    malleability

  4. ((d))

    brittleness

Show Answer
Answer: ((a))

hardness

41

The atomic mass of sulphur is 32 u, and sulphur exists as S₈ molecules. What is the molecular mass of sulphur? 

  1. ((a))

    256 u

  2. ((b))

    32 u

  3. ((c))

    64 u

  4. ((d))

    128 u

Show Answer
Answer: ((a))

256 u

42

Where can one find the option to change a PowerPoint template?

  1. ((a))

    View → Slide Master

  2. ((b))

    Insert → Themes

  3. ((c))

    Design → Themes

  4. ((d))

    Home → Layout 

Show Answer
Answer: ((a))

View → Slide Master

43

Who is known as the leader of the Green Revolution in India?

  1. ((a))

    C Subramaniam

  2. ((b))

    Prof. MS Swaminathan

  3. ((c))

    Dr. Rajendra Prasad

  4. ((d))

    Tribhuvandas Kishibhai Patel

Show Answer
Answer: ((a))

C Subramaniam

44

Which of the following is NOT a source of collection of municipal solid waste?

  1. ((a))

    Waste from homes

  2. ((b))

    Radioactive waste

  3. ((c))

    Waste from hospitals

  4. ((d))

    Waste from schools

Show Answer
Answer: ((a))

Waste from homes

45

Electricity production is categorised under which of the following economic sectors?

  1. ((a))

    Primary sector

  2. ((b))

    Secondary sector

  3. ((c))

    Tertiary sector

  4. ((d))

    Quaternary sector 

Show Answer
Answer: ((a))

Primary sector

46

Who among the following established the Bengal Chemical Swadeshi Stores?

  1. ((a))

    Dadabhai Naoroji

  2. ((b))

    Surendranath Banerjee

  3. ((c))

    BG Tilak

  4. ((d))

    Acharya PC Ray

Show Answer
Answer: ((a))

Dadabhai Naoroji

47

The wavelength of ultraviolet radiations which is most powerful and causes damage to the DNA is _____. 

  1. ((a))

    UV-C

  2. ((b))

    UV-B

  3. ((c))

    UV-D

  4. ((d))

    UV-A

Show Answer
Answer: ((a))

UV-C

48

What happens when you click on the 'Forward' button in an email?

  1. ((a))

    A blank email opens.

  2. ((b))

    The original message is copied into a new email draft. 

  3. ((c))

    The email is permanently deleted. 

  4. ((d))

    The email is automatically sent to all contacts. 

Show Answer
Answer: ((a))

A blank email opens.

49

Which of the following will increase the heat produced by a heating element?

  1. ((a))

    Using a material with high conductivity

  2. ((b))

    Decreasing the applied voltage

  3. ((c))

    Using a wire of lower resistance

  4. ((d))

    Increasing the current flowing through the wire 

Show Answer
Answer: ((a))

Using a material with high conductivity

50

A car moving at a constant speed of 123 km/hr along a straight road is an example of ________.

  1. ((a))

    uniform motion 

  2. ((b))

    rotational motion

  3. ((c))

    random motion

  4. ((d))

    non-uniform motion

Show Answer
Answer: ((a))

uniform motion 

Technical Abilities (100 questions)

51

In Shunt Zener diode voltage regulator circuit, the purpose of the resistor (R) connected in series with the input voltage is:

  1. ((a))

    to filter out noise and ripples in the output voltage

  2. ((b))

    to amplify the input voltage

  3. ((c))

    to limit the current through the Zener diode

  4. ((d))

    to add the input voltage and voltage drop across the resistor R and provide it to the Zener diode

Show Answer
Answer: ((a))

to filter out noise and ripples in the output voltage

52

In arc heating, the arc is sustained by:

  1. ((a))

    dielectric strength of air

  2. ((b))

    magnetic field

  3. ((c))

    ionisation of air

  4. ((d))

    heat conduction

Show Answer
Answer: ((a))

dielectric strength of air

53

The difference between Capacity Factor and Load Factor represents __________.

  1. ((a))

    the total energy consumed by the plant

  2. ((b))

    the plant's efficiency in converting fuel to electricity

  3. ((c))

    the maximum demand of the plant

  4. ((d))

    the plant’s reserve capacity for future load growth

Show Answer
Answer: ((a))

the total energy consumed by the plant

54

Which of the following is characteristic of soft magnetic materials?

  1. ((a))

    Large hysteresis loss

  2. ((b))

    Low coercivity

  3. ((c))

    Low relative permeability

  4. ((d))

    Low absolute permeability

Show Answer
Answer: ((a))

Large hysteresis loss

55

Find the total current fed at the sending end A, in the given ring distributor ABC_________.

  1. ((a))

    (13.6 + j14.4) A

  2. ((b))

    (12 + j8) 

  3. ((c))

    (14.4 + j13.6) A

  4. ((d))

    (8 + j6) A

Show Answer
Answer: ((a))

(13.6 + j14.4) A

56

Read the given Assertion (A) and Reason (R) carefully and select the correct option.

(A): Weakening of springs in PMMC is due to aging and temperature.

(R): Permanent magnets used in PMMC instruments tend to lose their strength over time.

  1. ((a))

    A is false, but R is true

  2. ((b))

    Both A and R are true, but R is not the correct explanation of A.

  3. ((c))

    A is true, but R is false. 

  4. ((d))

    Both A and R are true, and R is the correct explanation of A.

Show Answer
Answer: ((a))

A is false, but R is true

57

With reference to energy band diagram of the NPN BJT, there exist ________ space charge regions and maximum band bending at _________ junction. 

  1. ((a))

    three; base collector

  2. ((b))

    two; base emitter

  3. ((c))

    three; base emitter

  4. ((d))

    two; base collector

Show Answer
Answer: ((a))

three; base collector

58

The ‘π (Pi) Model’ or the ‘T Model’ is commonly used to represent which type of transmission line?

  1. ((a))

    Medium transmission line (80 km to 160 km)

  2. ((b))

    Long transmission line (more than 160 km) 

  3. ((c))

    Ultra-high voltage transmission line (above 1000 km)

  4. ((d))

    Short transmission line (less than 80 km)

Show Answer
Answer: ((a))

Medium transmission line (80 km to 160 km)

59

Why are short-pitch windings preferred in alternators despite their lower induced EMF per coil?

  1. ((a))

    They eliminate the need for insulation.

  2. ((b))

    They increase the length of end connections.

  3. ((c))

    They allow for higher voltage ratings.

  4. ((d))

    They increase the overall efficiency.

Show Answer
Answer: ((a))

They eliminate the need for insulation.

60

In a Star-Delta Starter used for induction motors, the starting torque is reduced to approximately:

  1. ((a))

    33% of full-load torque

  2. ((b))

    66% of full-load torque

  3. ((c))

    50% of full-load torque

  4. ((d))

    75% of full-load torque

Show Answer
Answer: ((a))

33% of full-load torque

61

Microwave heating is based on the principle of:

  1. ((a))

    conduction heating

  2. ((b))

    dielectric heating

  3. ((c))

    induction heating

  4. ((d))

    arc heating

Show Answer
Answer: ((a))

conduction heating

62

Which of the following is a key characteristic of a slip ring induction motor?

  1. ((a))

    High efficiency at all loads

  2. ((b))

    Low starting torque and high starting current 

  3. ((c))

    Operates only at synchronous speed

  4. ((d))

    High starting torque and low starting current 

Show Answer
Answer: ((a))

High efficiency at all loads

63

What is the primary purpose of estimation and costing in unit earthing for commercial installations?

  1. ((a))

    To eliminate the need for earthing in electrical systems

  2. ((b))

    To determine the materials, labour and costs required for a safe and effective earthing system

  3. ((c))

    To ensure the earthing system is aesthetically pleasing

  4. ((d))

    To focus only on the decorative aspects of the installation

Show Answer
Answer: ((a))

To eliminate the need for earthing in electrical systems

64

Consider a fixed bias circuit using a NPN BJT transistor in CE configuration along with base resistance Rb, collector resistance Rc and supply voltage Vcc. If β is the current gain of the BJT, then the stability factor of the fixed bias circuit is:

  1. ((a))

    inversely proportional to β

  2. ((b))

    independent of β 

  3. ((c))

    directly proportional to β

  4. ((d))

    inversely proportional to square of β

Show Answer
Answer: ((a))

inversely proportional to β

65

What is the primary purpose of 'Inter-Turn Fault Protection' in an alternator?

  1. ((a))

    To detect faults between the rotor and stator windings

  2. ((b))

    To monitor the voltage imbalance in the alternator

  3. ((c))

    To protect against earth faults in the rotor winding

  4. ((d))

    To detect faults between adjacent turns of the stator winding 

Show Answer
Answer: ((a))

To detect faults between the rotor and stator windings

66

The direction of the induced EMF in a coil may be found with the help of:

  1. ((a))

    Fleming's right-hand rule 

  2. ((b))

    Fleming's left-hand rule

  3. ((c))

    Steinmetz's law

  4. ((d))

    Faraday's law

Show Answer
Answer: ((a))

Fleming's right-hand rule 

67

In a synchronous motor, If the load angle exceeds 90°, then the motor will: 

  1. ((a))

    lose synchronism and stall

  2. ((b))

    reduce copper losses

  3. ((c))

    increase efficiency

  4. ((d))

    operate at leading power factor

Show Answer
Answer: ((a))

lose synchronism and stall

68

What is the role of heliostats in a power tower system?

  1. ((a))

    To store solar energy for later use

  2. ((b))

    To convert thermal energy into electrical energy

  3. ((c))

    To track the Sun and direct sunlight to the receiver

  4. ((d))

    To generate electricity directly

Show Answer
Answer: ((a))

To store solar energy for later use

69

What law explains the induction of eddy currents in the armature core?

  1. ((a))

    Lenz's Law

  2. ((b))

    Faraday's Law 

  3. ((c))

    Ohm's Law

  4. ((d))

    Ampere's Law 

Show Answer
Answer: ((a))

Lenz's Law

70

In an auto transformer, if the voltage transformation ratio is 2 : 1, what is the ratio of the primary current to the secondary current?

  1. ((a))

    2 : 1

  2. ((b))

    1 : 2

  3. ((c))

    1 : 1

  4. ((d))

    2 : 3

Show Answer
Answer: ((a))

2 : 1

71

What is the purpose of '100% Stator Earth Fault Protection' in an alternator?

  1. ((a))

    To monitor the voltage regulation of the alternator

  2. ((b))

    To detect and protect against earth faults occurring anywhere in the stator winding

  3. ((c))

    To detect and protect against phase-to-phase faults in the stator winding 

  4. ((d))

    To protect the rotor winding from overheating

Show Answer
Answer: ((a))

To monitor the voltage regulation of the alternator

72

Which of the following statements is NOT correct regarding the errors in a Potential Transformer?

  1. ((a))

    Both Power angle error and Ratio error influence Power measurement.

  2. ((b))

    Both Power angle error and Ratio error are important for measuring Voltage

  3. ((c))

    Power angle error alone affects Voltage measurement in a Potential Transformer.

  4. ((d))

    Voltage measurement in a Potential Transformer depends primarily on Ratio error. 

Show Answer
Answer: ((a))

Both Power angle error and Ratio error influence Power measurement.

73

In the torque-load characteristic curve of a DC series motor, what happens as the load increases?

  1. ((a))

    The torque becomes constant. 

  2. ((b))

    The torque decreases proportionally

  3. ((c))

    The torque increases proportionally to the square of the armature current.

  4. ((d))

    The armature current decreases.

Show Answer
Answer: ((a))

The torque becomes constant. 

74

Fleming's Right-Hand Rule is used to determine the direction of:

  1. ((a))

    magnetic field around a conductor

  2. ((b))

    the induced electromotive force

  3. ((c))

    force on a charged particle

  4. ((d))

    current flowing through a conductor

Show Answer
Answer: ((a))

magnetic field around a conductor

75

In j-notation, used in phasor representation, the imaginary unit j2 represents ____.

  1. ((a))

    -1

  2. ((b))

    √-1

  3. ((c))

    1

  4. ((d))

    0

Show Answer
Answer: ((a))

-1

76

A power system with a high reactive power demand will result in _____.

  1. ((a))

    high power factor

  2. ((b))

    no change in power factor

  3. ((c))

    unity power factor

  4. ((d))

    low power factor

Show Answer
Answer: ((a))

high power factor

77

Which factor does NOT affect the starting torque of an induction start synchronous motor?

  1. ((a))

    Field excitation during startup

  2. ((b))

    Rotor reactance

  3. ((c))

    Rotor resistance

  4. ((d))

    Supply voltage

Show Answer
Answer: ((a))

Field excitation during startup

78

In a power triangle, what is the relationship between active power (P), reactive power (Q) and apparent power (S)?

  1. ((a))

    Q2 = S2 + P2

  2. ((b))

    P2 = S2 + Q2

  3. ((c))

    S = P + Q

  4. ((d))

    S2 = P2 + Q2

Show Answer
Answer: ((a))

Q2 = S2 + P2

79

In a series RLC circuit, the total impedance is minimum when _______.

  1. ((a))

    XL < Xc

  2. ((b))

    XL > Xc

  3. ((c))

    the resistance is zero

  4. ((d))

    XL=XC

Show Answer
Answer: ((a))

XL < Xc

80

What is the main drawback of using an induction generator in a grid-connected wind turbine? 

  1. ((a))

    It is not suitable for wind energy applications.

  2. ((b))

    It cannot generate active power.

  3. ((c))

    It requires external reactive power from the grid.

  4. ((d))

    It cannot operate at high speeds

Show Answer
Answer: ((a))

It is not suitable for wind energy applications.

81

In a three-phase induction motor which component represents mechanical load in the equivalent circuit?

  1. ((a))

    R2 (1 - s)

  2. ((b))

    R2(1−s)s\rm \frac{R_2(1-s)}{s}

  3. ((c))

    sR2(1−s)s\rm \frac{sR_2(1-s)}{s}

  4. ((d))

    R2s\rm \frac{R_2}{s}

Show Answer
Answer: ((a))

R2 (1 - s)

82

In a three-phase star-connected system with a neutral shift, how can the problem be corrected?

  1. ((a))

    By increasing the phase voltage 

  2. ((b))

    By increasing the neutral wire resistance

  3. ((c))

    By disconnecting the neutral wire

  4. ((d))

    By balancing the load among the three phases

Show Answer
Answer: ((a))

By increasing the phase voltage 

83

Read the given Assertion (A) and Reason (R) carefully and select the correct option.

(A): The burden of an instrument transformer is usually expressed in volt-amperes (VA).

(R): Burden is the total impedance of the connected devices, including meters, relays, and wiring

  1. ((a))

    Both A and R are true and R is the not the correct explanation of A. 

  2. ((b))

    A is false, but R is true.

  3. ((c))

    A is true, but R is false.

  4. ((d))

    Both A and R are true and R is the correct explanation of A.

Show Answer
Answer: ((a))

Both A and R are true and R is the not the correct explanation of A. 

84

What is the first step in the design procedure for electrical installations in commercial buildings?

  1. ((a))

    Conducting a load analysis to determine power requirements

  2. ((b))

    Installing protective devices without planning

  3. ((c))

    Selecting decorative lighting fixtures

  4. ((d))

    Ignoring safety standards to reduce costs

Show Answer
Answer: ((a))

Conducting a load analysis to determine power requirements

85

Which connection method is correct when using a CT and PT with a wattmeter?

  1. ((a))

    CT is connected in series with the wattmeter current coil, and PT is connected in parallel with the voltage coil.

  2. ((b))

    CT is connected in parallel with the wattmeter current coil, and PT is connected in series with the voltage coil. 

  3. ((c))

    Both CT and PT are connected in series with the wattmeter.

  4. ((d))

    Both CT and PT are connected in parallel with the wattmeter.

Show Answer
Answer: ((a))

CT is connected in series with the wattmeter current coil, and PT is connected in parallel with the voltage coil.

86

When armature conductors carry a lower load current, the armature's MMF (magnetomotive force) causes:

  1. ((a))

    no effect on the main field flux

  2. ((b))

    the main field flux to strengthen

  3. ((c))

    an increase in the induced emf 

  4. ((d))

    a cross-magnetising effect

Show Answer
Answer: ((a))

no effect on the main field flux

87

Find the current I4 flowing in the circuit shown below. 

  1. ((a))

    13 A

  2. ((b))

    23 A

  3. ((c))

    17 A

  4. ((d))

    27 A

Show Answer
Answer: ((a))

13 A

88

Winding in wire wound resistor is made up of _____________.

  1. ((a))

    Carbon

  2. ((b))

    Chromium cobalt

  3. ((c))

    Nickel 

  4. ((d))

    Nickel-chromium alloy

Show Answer
Answer: ((a))

Carbon

89

The luminous intensity of a source emitting light uniformly in all directions of 10 lumens per steradian is:

  1. ((a))

    1 candela

  2. ((b))

    5 candela

  3. ((c))

    10 candela

  4. ((d))

    20 candela

Show Answer
Answer: ((a))

1 candela

90

Shaded pole motors are ideal for ____________.

  1. ((a))

    low-power, continuous-duty applications

  2. ((b))

    intermittent heavy-load tasks

  3. ((c))

    high-vibration environments

  4. ((d))

    precision speed control

Show Answer
Answer: ((a))

low-power, continuous-duty applications

91

For a P-N junction diode, as the temperature increases the forward knee voltage of the diode ________ and the reverse saturation current __________.

  1. ((a))

    decreases; decreases

  2. ((b))

    increases; decreases

  3. ((c))

    increases; increases

  4. ((d))

    decreases; increases

Show Answer
Answer: ((a))

decreases; decreases

92

If laplace transform of voltage across capacitor of value 0.5 F is Vc(s)=1s2+1\rm V_c(s)=\frac{1}{s^2+1}, the value of current through capacitor at t = 0+ will be:

  1. ((a))

    1 A

  2. ((b))

    0.5 A

  3. ((c))

    zero

  4. ((d))

    2 A

Show Answer
Answer: ((a))

1 A

93

Coefficient of coupling between two coils is given as ______, where M = Mutual Inductance, L1 = Self Inductance of coil 1 and L2 = Self Inductance of coil 2

  1. ((a))

    ML1L2\rm \frac{M}{\sqrt{L_1L_2}}

  2. ((b))

    L1L2M\rm \frac{\sqrt{L_1L_2}}{M}

  3. ((c))

    ML1L2\rm M\sqrt{L_1L_2}

  4. ((d))

    L1L2.M

Show Answer
Answer: ((a))

ML1L2\rm \frac{M}{\sqrt{L_1L_2}}

94

Which of the following components is responsible for atomising the fuel in a diesel engine?

  1. ((a))

    Turbocharger

  2. ((b))

    Carburetor

  3. ((c))

    Fuel pump

  4. ((d))

    Injector

Show Answer
Answer: ((a))

Turbocharger

95

Identify the correct statement related to switching speed of the BJT.

  1. ((a))

    Switching speed of BJT is greater than switching speed on a MOSFET.

  2. ((b))

    Switching speed of BJT is equal to switching speed on a MOSFET.

  3. ((c))

    Switching speed of BJT is less compared to switching speed on a MOSFET.

  4. ((d))

    BJT is an amplifying device and hence cannot work as a switch. Therefore, switching speed parameter does not exist for a BJT. 

Show Answer
Answer: ((a))

Switching speed of BJT is greater than switching speed on a MOSFET.

96

The eddy current loss in a transformer is caused by:

  1. ((a))

    resistance of the primary winding

  2. ((b))

    voltage drop across the windings

  3. ((c))

    saturation of the core material

  4. ((d))

    circulating currents within the core due to changing magnetic flux

Show Answer
Answer: ((a))

resistance of the primary winding

97

A 0.5Ω shunt resistor is used to measure current with a CRO. If the measured voltage drop is 5V, what is the current?

  1. ((a))

    2.5 A

  2. ((b))

    10 A

  3. ((c))

    5 A

  4. ((d))

    20 A

Show Answer
Answer: ((a))

2.5 A

98

Electric Arc Welding is a type of:

  1. ((a))

    resistance welding

  2. ((b))

    fusion welding

  3. ((c))

    solid-state welding

  4. ((d))

    pressure welding

Show Answer
Answer: ((a))

resistance welding

99

Which of the following best describes the role of cogeneration in energy conservation and how the application of a tariff system can help reduce energy bills?

  1. ((a))

    Cogeneration is only applicable in large industrial settings and has no impact on energy conservation, while tariff systems are solely used for revenue generation by utilities. 

  2. ((b))

    Cogeneration and tariff systems are unrelated concepts, and neither contributes to energy conservation or cost reduction.

  3. ((c))

    Cogeneration increases energy consumption by producing excess electricity, and tariff systems are used to penalize high energy users without reducing bills.

  4. ((d))

     Cogeneration reduces energy waste by simultaneously producing electricity and useful thermal energy, while a welldesigned tariff system incentivizes off-peak energy usage, lowering overall costs. 

Show Answer
Answer: ((a))

Cogeneration is only applicable in large industrial settings and has no impact on energy conservation, while tariff systems are solely used for revenue generation by utilities. 

100

Which of the following materials should NOT be placed in a microwave oven?

  1. ((a))

    Paper

  2. ((b))

    Aluminium foil

  3. ((c))

    Glass

  4. ((d))

    Plastic

Show Answer
Answer: ((a))

Paper

101

Two magnetic paths BE and BCDE are in parallel and form a parallel magnetic circuit, as shown in the given figure. The Ampere Turn required for this parallel circuit is equal to: 

  1. ((a))

    inverse of Ampere Turn required for BE

  2. ((b))

    ampere Turn required for any one of the paths

  3. ((c))

    square of Ampere Turn required for any one of the paths 

  4. ((d))

    sum of Ampere Turn required for BE and BCDE

Show Answer
Answer: ((a))

inverse of Ampere Turn required for BE

102

Which of the following is a common internal fault in transformers?

  1. ((a))

    High power factor leading to overheating

  2. ((b))

    Excessive cooling system efficiency

  3. ((c))

    Overvoltage due to lightning strikes

  4. ((d))

    Winding inter-turn short circuits

Show Answer
Answer: ((a))

High power factor leading to overheating

103

Which of the following statements regarding active power in AC circuits is INCORRECT?

  1. ((a))

    Active power increases with an increase in power factor.

  2. ((b))

    Active power is the real power consumed by the circuit.

  3. ((c))

    Active power is given by P=VIsinϕ in an AC circuit. 

  4. ((d))

    The unit of active power is Watt (W).

Show Answer
Answer: ((a))

Active power increases with an increase in power factor.

104

Which type of transformer is best suited for applications that require a low leakage reactance?

  1. ((a))

    Ring type transformer

  2. ((b))

    Core type transformer

  3. ((c))

    Shell type transformer

  4. ((d))

    Laminated type transformer

Show Answer
Answer: ((a))

Ring type transformer

105

For simple fixed bias BJT in common emitter configuration using NPN transistor, base resistance Rb, collector resistance Rc and supply voltage Vcc, the base current __________ with increase in Rb and the emitter current ____________.

  1. ((a))

    decreases; increases

  2. ((b))

    increases; increases

  3. ((c))

    decreases; decreases

  4. ((d))

    increases; decreases

Show Answer
Answer: ((a))

decreases; increases

106

Which of the following is the commonly used generator in a DC welding machine? 

  1. ((a))

    Shunt generator

  2. ((b))

    Permanent magnet generator

  3. ((c))

    Compound generator 

  4. ((d))

    Series generator

Show Answer
Answer: ((a))

Shunt generator

107

The relation between absolute permeability, μ and relative permeability μr of a material is given by:

(Given μo is absolute permeability of air)

  1. ((a))

    μ0=μrμ\rm \mu_0=\frac{\mu_r}{\mu}

  2. ((b))

    μr=μμ0\rm \mu_r=\frac{\mu}{\mu_0}

  3. ((c))

    μ=μ0μr\rm \mu=\frac{\mu_0}{\mu_r}

  4. ((d))

    μ = μr

Show Answer
Answer: ((a))

μ0=μrμ\rm \mu_0=\frac{\mu_r}{\mu}

108

If the quality factor (Q) of a resonant series circuit increases, then what happens to the voltage magnification?

  1. ((a))

    It remains the same because supply voltage is constant.

  2. ((b))

    It increases because energy losses decrease. 

  3. ((c))

    It becomes zero because resonance cancels the reactance

  4. ((d))

    It decreases because resistance increases.

Show Answer
Answer: ((a))

It remains the same because supply voltage is constant.

109

Universal motors exhibit high starting torque due to _______.

  1. ((a))

    series connection of stator and rotor windings

  2. ((b))

    permanent magnet stators

  3. ((c))

    shunt winding configuration

  4. ((d))

    use of squirrel-cage rotors

Show Answer
Answer: ((a))

series connection of stator and rotor windings

110

How does the starting torque of a split-phase motor compare with that of a shaded-pole motor?

  1. ((a))

    Both have similar starting torque.

  2. ((b))

    Split-phase motors have higher starting torque.

  3. ((c))

    Split-phase motors have no starting torque.

  4. ((d))

    Shaded-pole motors have higher starting torque. 

Show Answer
Answer: ((a))

Both have similar starting torque.

111

In a biomass power plant, what is the main purpose of the combustion/gasification chamber?

  1. ((a))

    To cool down the system after power generation

  2. ((b))

    To store biomass for future use

  3. ((c))

    To burn biomass or convert it into syngas for energy generation

  4. ((d))

    To distribute electricity to the grid

Show Answer
Answer: ((a))

To cool down the system after power generation

112

A composite magnetic circuit consisting of three different magnetic material of different permeability are joined in the form of a ring. The total reluctance is:

  1. ((a))

    the sum of individual reluctances.

  2. ((b))

    thrice the reluctance of material 1

  3. ((c))

    the product of individual reluctances

  4. ((d))

    inverse of the sum of individual reluctances 

Show Answer
Answer: ((a))

the sum of individual reluctances.

113

Why is an electrodynamometer-type wattmeter used as a standard instrument in laboratories? 

  1. ((a))

    It works only for low-power circuits

  2. ((b))

    It has high accuracy and precision.

  3. ((c))

    It is cheaper than other wattmeters. 

  4. ((d))

    It requires no external power supply.

Show Answer
Answer: ((a))

It works only for low-power circuits

114

Why does Kelvin’s Law give different conductor sizes for two identical systems?

  1. ((a))

    Because the electrical load is different in both systems

  2. ((b))

    Due to variations in interest rates, depreciation, and energy costs

  3. ((c))

    Because one system uses overhead lines and the other uses underground cables

  4. ((d))

    Because the resistance of conductors is always changing

Show Answer
Answer: ((a))

Because the electrical load is different in both systems

115

Magnetic fringing can be minimised by:

  1. ((a))

    scattering the magnetic flux

  2. ((b))

    decreasing the temperature

  3. ((c))

    using low quality magnetic material

  4. ((d))

    reducing the air gap

Show Answer
Answer: ((a))

scattering the magnetic flux

116

Calculate the potential difference of an energy source that provides 6.8 J for every millicoulomb of charge that it delivers.

  1. ((a))

    6.8 mV 

  2. ((b))

    6.8 kV 

  3. ((c))

    6.8 V

  4. ((d))

    0.68 V

Show Answer
Answer: ((a))

6.8 mV 

117

Which of the following is NOT a condition for the parallel operation of transformers?

  1. ((a))

    Same per unit impedance

  2. ((b))

    Same voltage ratio

  3. ((c))

    Same core material 

  4. ((d))

    Same polarity

Show Answer
Answer: ((a))

Same per unit impedance

118

The total collector current for a BJT operating in the active region is given by the relation _________ and the leakage current component is ___________. 

  1. ((a))

    Ic = Ico(minority); majority carrier component

  2. ((b))

    Ic = Ic(majority) + Ico(minority); majority carrier component

  3. ((c))

    Ic = Ic(majority); minority carrier component

  4. ((d))

    Ic = Ic(majority) + Ico(minority); minority carrier component

Show Answer
Answer: ((a))

Ic = Ico(minority); majority carrier component

119

What is a key factor in the installation and costing of electrical systems for commercial buildings?

  1. ((a))

    Ignoring safety standards to reduce costs

  2. ((b))

    Ensuring compliance with electrical codes and standards while estimating materials and labour costs 

  3. ((c))

    Focusing only on decorative lighting and aesthetics

  4. ((d))

    Eliminating the use of protective devices

Show Answer
Answer: ((a))

Ignoring safety standards to reduce costs

120

Which of the following is a commonly used light source in modern street light installations?

  1. ((a))

    Fluorescent tubes

  2. ((b))

    Candles

  3. ((c))

    Incandescent bulbs 

  4. ((d))

    High-Pressure Sodium (HPS) lamps 

Show Answer
Answer: ((a))

Fluorescent tubes

121

Which of the following is NOT an advantage of a PMMC instrument?

  1. ((a))

    Suitable for AC and DC measurements

  2. ((b))

    Linear scale

  3. ((c))

    High accuracy

  4. ((d))

    Low power consumption

Show Answer
Answer: ((a))

Suitable for AC and DC measurements

122

Stray load losses in synchronous motors are caused by __________. 

  1. ((a))

    poor lubrication in bearings

  2. ((b))

    excessive field excitation

  3. ((c))

    leakage fluxes and harmonic effects

  4. ((d))

    high rotor inertia

Show Answer
Answer: ((a))

poor lubrication in bearings

123

In Lambert’s Cosine Law, the angle θ is measured between:

  1. ((a))

    reflected light and normal

  2. ((b))

    source and observer 

  3. ((c))

    incident light and normal

  4. ((d))

    horizontal and vertical plane

Show Answer
Answer: ((a))

reflected light and normal

124

A single-phase distributor, 2 km long, has a line impedance of (0.2 + 0.3j) Ω/km. It supplies a load at the far end, where the voltage VB is 100 V and the current is 100 A at unity power factor. Additionally, a load of 100 A at 0.8 power factor lagging is connected at its midpoint. Calculate the voltage drop at the midpoint.

  1. ((a))

    120 + j15

  2. ((b))

    110 + j15

  3. ((c))

    210 + j15

  4. ((d))

    120 + j30

Show Answer
Answer: ((a))

120 + j15

125

What is the purpose of a closed feeder ring in an interconnected system?

  1. ((a))

    To reduce voltage stability

  2. ((b))

    To prevent power distribution

  3. ((c))

    To disconnect substations from each other

  4. ((d))

    To create a looped power supply network

Show Answer
Answer: ((a))

To reduce voltage stability

126

The collector to base bias circuit in BJT has better stability than fixed bias circuit as __________.

  1. ((a))

    it can operate on higher supply voltages than that of fixed bias circuit

  2. ((b))

    it can operate on higher power than fixed bias circuit

  3. ((c))

    its stability factor is lower than that of fixed bias

  4. ((d))

    its stability factor is higher than that of fixed bias 

Show Answer
Answer: ((a))

it can operate on higher supply voltages than that of fixed bias circuit

127

Which underground cable laying method requires re-excavation for load expansion, making modifications costly?

  1. ((a))

    Draw-in System

  2. ((b))

    Overhead System

  3. ((c))

    Trough Laying

  4. ((d))

    Direct Laying

Show Answer
Answer: ((a))

Draw-in System

128

Power of an electrical system is measured in _____. 

  1. ((a))

    watt-sec

  2. ((b))

    newton-metre

  3. ((c))

    joule

  4. ((d))

    watt

Show Answer
Answer: ((a))

watt-sec

129

If the frequency of a series R-C circuit is increased, what happens to the capacitive reactance XC?

  1. ((a))

    It decreases

  2. ((b))

    It remains constant

  3. ((c))

    It increases 

  4. ((d))

    It becomes infinite

Show Answer
Answer: ((a))

It decreases

130

Which of the following statements is NOT correct regarding the vector method in AC circuit analysis?

  1. ((a))

    The vector method is used to represent sinusoidal AC quantities.

  2. ((b))

    The vector method helps in determining the phase difference between voltage and current.

  3. ((c))

    Phasors in the vector method rotate in a clockwise direction in the complex plane.

  4. ((d))

    Phasor diagrams are used to solve AC circuit problems involving impedance.

Show Answer
Answer: ((a))

The vector method is used to represent sinusoidal AC quantities.

131

A nuclear reactor produces 3.2×1010 J of energy per second. How many fissions occur per second if each fission releases 200 MeV?

  1. ((a))

    1010

  2. ((b))

    1021

  3. ((c))

    1011

  4. ((d))

    1019

Show Answer
Answer: ((a))

1010

132

In relay terminology, what does the term 'pickup value' refer to?

  1. ((a))

    The time delay before the relay operates after detecting a fault

  2. ((b))

    The minimum value of the operating quantity (current, voltage, etc.) required to activate the relay 

  3. ((c))

    The voltage level at which the relay resets after a fault is cleared

  4. ((d))

    The maximum current a relay can withstand without damage

Show Answer
Answer: ((a))

The time delay before the relay operates after detecting a fault

133

The luminous intensity of a light source is defined as the luminous flux per unit:

  1. ((a))

    volume

  2. ((b))

    length

  3. ((c))

    area

  4. ((d))

    solid angle

Show Answer
Answer: ((a))

volume

134

Which control method enables four-quadrant operation of induction motors?

  1. ((a))

    Variable Frequency Drive (VFD)

  2. ((b))

    Rotor resistance control 

  3. ((c))

    Stator voltage control 

  4. ((d))

    Direct On-Line (DOL) starting

Show Answer
Answer: ((a))

Variable Frequency Drive (VFD)

135

The EMF equation of a transformer is given by:

  1. ((a))

    E = 4.44fNϕ

  2. ((b))

    E = 4.44fNAϕ 

  3. ((c))

    E = 4.44NAϕ

  4. ((d))

    E = 4.44f2ϕN

Show Answer
Answer: ((a))

E = 4.44fNϕ

136

Which of the following is an example of a constant load application for a DC shunt motor?

  1. ((a))

    Centrifugal pump

  2. ((b))

    DC arc welding

  3. ((c))

    Induction heating

  4. ((d))

    Electric motor

Show Answer
Answer: ((a))

Centrifugal pump

137

In large-scale solar PV plants, why is string inverter technology preferred over central inverters in some cases? 

  1. ((a))

    It requires fewer connections and is easier to maintain.

  2. ((b))

    It generates higher voltage DC output. 

  3. ((c))

    It reduces power losses due to shading and mismatch. 

  4. ((d))

    It eliminates the need for AC cabling.

Show Answer
Answer: ((a))

It requires fewer connections and is easier to maintain.

138

How many types of heating elements are commonly used in electric irons?

  1. ((a))

    Four

  2. ((b))

    Two

  3. ((c))

    One

  4. ((d))

    Three

Show Answer
Answer: ((a))

Four

139

What is the bias stability factor (S) for a fixed bias circuit?

  1. ((a))

    S = (1 + β) / (1 + β + β^2)

  2. ((b))

    S = (1 + β)

  3. ((c))

    S = β / (1 + β)

  4. ((d))

    S = 1 / (1 + β)

Show Answer
Answer: ((a))

S = (1 + β) / (1 + β + β^2)

140

During the no-load test of a transformer, the secondary winding is: 

  1. ((a))

    connected to a load

  2. ((b))

    connected in parallel with the primary winding

  3. ((c))

    short-circuited

  4. ((d))

    open-circuited

Show Answer
Answer: ((a))

connected to a load

141

The capacitance of a parallel plate capacitor depends upon:

  1. ((a))

    potential difference between plates

  2. ((b))

    thickness of plates

  3. ((c))

    separation between plates 

  4. ((d))

    type of metal used

Show Answer
Answer: ((a))

potential difference between plates

142

In Norton’s Theorem, the equivalent circuit consists of _____.

  1. ((a))

    a voltage source in parallel with a resistor

  2. ((b))

    a current source in series with a resistor

  3. ((c))

    a current source in parallel with a resistor

  4. ((d))

    a voltage source in series with a resistor

Show Answer
Answer: ((a))

a voltage source in parallel with a resistor

143

Which of the following is a critical factor in the installation and estimation of agricultural pumps and flourmills?

  1. ((a))

    Ignoring the load characteristics to simplify the design

  2. ((b))

    Focusing only on the mechanical components of the system 

  3. ((c))

    Ensuring the system operates without any protective devices

  4. ((d))

    Calculating the power requirements and selecting appropriate protective devices

Show Answer
Answer: ((a))

Ignoring the load characteristics to simplify the design

144

If the impedance of a parallel circuit is given by Z = 5 − j4, then the admittance is given by________.

  1. ((a))

    5 + j4 

  2. ((b))

    5 − j4

  3. ((c))

    9

  4. ((d))

    5+j441\frac{5+j4}{41}

Show Answer
Answer: ((a))

5 + j4 

145

Why is voltage drop analysis important in an AC distribution system?

  1. ((a))

    To increase power losses

  2. ((b))

    To reduce the system frequency

  3. ((c))

    To increase resistance in the conductors

  4. ((d))

    To ensure voltage levels remain within acceptable limits

Show Answer
Answer: ((a))

To increase power losses

146

In a transformer, if the frequency of the supply voltage is increased, what happens to the induced voltage?

  1. ((a))

    It becomes zero

  2. ((b))

    It remains the same

  3. ((c))

    It decreases

  4. ((d))

    It increases

Show Answer
Answer: ((a))

It becomes zero

147

In a transformer, the efficiency can be calculated with reasonable accuracy by knowing:

  1. ((a))

    the losses (core and copper losses)

  2. ((b))

    the input and output voltage

  3. ((c))

    the short-circuit current

  4. ((d))

    the rated power

Show Answer
Answer: ((a))

the losses (core and copper losses)

148

If the power factor of a three-phase system is 0.8, and the apparent power is 10 kVA, then what is the active power?

  1. ((a))

    8 kW

  2. ((b))

    10 kW

  3. ((c))

    12 kW

  4. ((d))

    6 kW

Show Answer
Answer: ((a))

8 kW

149

How can polarity in transformers be verified?

  1. ((a))

    By conducting a short circuit test 

  2. ((b))

    By measuring the input current

  3. ((c))

    By checking the voltage across the secondary winding

  4. ((d))

    By using a voltmeter to measure the voltage difference

Show Answer
Answer: ((a))

By conducting a short circuit test 

150

What will be the voltage relationship of frequency domain relation for inductor having time domain v(t) = Ldi/dt?

  1. ((a))

    V(s) = LsI(s) − Li(0)

  2. ((b))

    V(s) = LI(s)

  3. ((c))

    V(s) = LsI(s)

  4. ((d))

    V(s) = LI(s) − Li(0)

Show Answer
Answer: ((a))

V(s) = LsI(s) − Li(0)

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