Official Paper

SSC JE Electrical 6 Nov 2024 Official Paper - II (Previous Year Paper)

100 questions · 120 minutes · with answers · free

Attempt as Timed Mock Test

General Engineering (100 questions)

1

Which of the following pairs correctly defines the term in definition?

  1. ((a))

     Resultant Vector: The angular separation between two sinusoidal waveforms with the same frequency.

  2. ((b))

     Phasor Subtraction: The process of finding the vector difference between two phasors in a phasor diagram.

  3. ((c))

     Vector Subtraction: A single vector that represents the sum or difference of two or more vectors

  4. ((d))

    Phase Difference: The representation of the complex amplitude and phase angle of a sinusoidal waveform or time-varying quantity.

Show Answer
Answer: ((a))

 Resultant Vector: The angular separation between two sinusoidal waveforms with the same frequency.

2

What type of electrical signal is shown in the given figure?

  1. ((a))

    Digital Signal

  2. ((b))

    Sinusoidal Signal

  3. ((c))

    Analog Signal

  4. ((d))

    Pulse Signal

Show Answer
Answer: ((a))

Digital Signal

3

A 12-pole alternator running at a speed of 600 rpm will produce a frequency of

  1. ((a))

     40 Hz

  2. ((b))

     30 Hz

  3. ((c))

     60 Hz

  4. ((d))

    50 Hz

Show Answer
Answer: ((a))

 40 Hz

4

The no-load primary input current lags the primary voltage by an angle

  1. ((a))

     ϕ < 90°

  2. ((b))

     ϕ = 90°

  3. ((c))

     ϕ = 175°

  4. ((d))

    ϕ = 135°

Show Answer
Answer: ((a))

 ϕ < 90°

5

Which of the given options best describes the truthfulness of the following statements with reference to the properties of the magnetic circuits? P: Permeance is the opposition offered to the magnetic flux by the magnetic path. Q: Magnetic lines of force cannot pass through air.

  1. ((a))

    Both P and Q are true

  2. ((b))

     P is true, but Q is false

  3. ((c))

     P is false, but Q is true

  4. ((d))

     Both P and Q are false

Show Answer
Answer: ((a))

Both P and Q are true

6

For a series RLC circuit, at resonance the

  1. ((a))

     current is maximum

  2. ((b))

    impedance is maximum

  3. ((c))

    power factor is zero

  4. ((d))

     current is minimum

Show Answer
Answer: ((a))

 current is maximum

7

Find the voltage 'v₁' in the following circuit.

  1. ((a))

    6 V

  2. ((b))

     -12 V

  3. ((c))

     12 V

  4. ((d))

     -6 V

Show Answer
Answer: ((a))

6 V

8

In an indirect arc furnace, the heat is transmitted from the arc to the top layer of the charge by and it operates at a power factor of

  1. ((a))

     radiation; 0.85 lagging

  2. ((b))

    . conduction; 0.8 leading

  3. ((c))

     radiation; 0.7 leading

  4. ((d))

     convection; 0.85 lagging

Show Answer
Answer: ((a))

 radiation; 0.85 lagging

9

Select the option that is true regarding the following two statements labelled Assertion (A) and Reason (R).

(A): Open tenders are invited by public advertisement.

(R): Any contractor who is willing to undertake the work and who has the requisite finance and equipment to complete the work satisfactorily is allowed to submit the offer.

  1. ((a))

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

  2. ((b))

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

  3. ((c))

     Statements A and R both are false.

  4. ((d))

     Statement A is true and statement B is false.

Show Answer
Answer: ((a))

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

10

A single-stack, eight-phase, multipole stepper motor has six rotor teeth. The phases are excited one at a time. Determine the number of steps per revolution.

  1. ((a))

    40

  2. ((b))

    48

  3. ((c))

    24

  4. ((d))

    32

Show Answer
Answer: ((a))

40

11

Choose the correct pair of bridge with its application:

  1. ((a))

     Kelvin double bridge: high resistance

  2. ((b))

    Loss of charge method: High Q-coil

  3. ((c))

     Wheatstone bridge: Very low resistance

  4. ((d))

     Corey Foster's bridge: Medium resistance

Show Answer
Answer: ((a))

 Kelvin double bridge: high resistance

12

If an electrical device consumes 50 watts of power for 10 minutes, what is the total electrical energy consumed by the device?

  1. ((a))

    10,000 J

  2. ((b))

     2500 J

  3. ((c))

     3,60,000 J

  4. ((d))

    30,000 J

Show Answer
Answer: ((a))

10,000 J

13

Match the different types of lamps with their relative luminous efficiencies.

Lamp TypeRelative Luminous Efficiency
(i) Sodium vapour lamp(b) very high
(ii) Fluorescent lamp(d) high
(iii) Tungsten filament lamp(a) medium
(iv) Carbon filament lamp(c) low
  1. ((a))

     (i)-(d), (ii)-(c), (iii)-(b), (iv)-(a)

  2. ((b))

     (i)-(b), (ii)-(a), (iii)-(d), (iv)-(c)

  3. ((c))

     (i)-(b), (ii)-(d), (iii)-(a), (iv)-(c)

  4. ((d))

     (i)-(b), (ii)-(c), (iii)-(d), (iv)-(a)

Show Answer
Answer: ((a))

 (i)-(d), (ii)-(c), (iii)-(b), (iv)-(a)

14

The turbine is a reaction turbine in which the runner receives water axially.

  1. ((a))

     Francis

  2. ((b))

     Kaplan

  3. ((c))

     Propeller

  4. ((d))

    Pelton

Show Answer
Answer: ((a))

 Francis

15

Which of the following is NOT a valid advantage of capacitor-start capacitor-run motor?

  1. ((a))
    1. High efficiency
  2. ((b))
    1. High power factor
  3. ((c))
    1. High starting torque
  4. ((d))
    1. Low cost
Show Answer
Answer: ((a))
  1. High efficiency
16

When applying Thevenin's Theorem to a circuit, if the Thevenin voltage is 40 V and the Thevenin equivalent resistance is 5Ω, what is the current through a load resistor of 15Ω connected across the terminals?

  1. ((a))

     0.5 A

  2. ((b))

     2 A

  3. ((c))

     1A

  4. ((d))

    2.5 A

Show Answer
Answer: ((a))

 0.5 A

17

A 15 -V source is applied to a capacitive circuit that has an impedance of (6-j8)Ω. Find the angle by which the current leads the voltage.

  1. ((a))
    1. tan⁻¹(12/0.9)
  2. ((b))
    1. tan⁻¹(1.2/9)
  3. ((c))
    1. tan⁻¹(0.9/1.2)
  4. ((d))
    1. tan⁻¹(12/9)
Show Answer
Answer: ((a))
  1. tan⁻¹(12/0.9)
18

Which of the following pair of typical diodes and their corresponding threshold voltages is INCORRECT?

  1. ((a))

     Silicon diode: 0.7 V

  2. ((b))

     Schottky diode: 0.2 V

  3. ((c))

     Light emitting diode: 0.1 V

  4. ((d))

     Germanium diode: 0.3 V

Show Answer
Answer: ((a))

 Silicon diode: 0.7 V

19

Which of the following is called the mechanical characteristic of a DC motor?

  1. ((a))

    Armature voltage vs. Armature current characteristic

  2. ((b))

    Torque vs. Armature current characteristic

  3. ((c))

     Speed vs. Torque characteristic

  4. ((d))

     Speed vs. Armature current characteristic

Show Answer
Answer: ((a))

Armature voltage vs. Armature current characteristic

20

Select the option that is true regarding the following two statements labelled Assertion (A) and Reason (R).

(A): In a synchronous generator phasor diagram, the armature current (Ia) is in phase with the excitation voltage (Ef), and the excitation voltage leads to the terminal voltage (Vt).

(R): When a synchronous generator operates in generating mode, the armature current is in phase with the excitation voltage, and the excitation voltage leads to the terminal voltage.

  1. ((a))

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

  2. ((b))

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

  3. ((c))

     A is true, but R is false.

  4. ((d))

     A is false, but R is true.

Show Answer
Answer: ((a))

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

21

In a resistance start motor, the pull-out torque is about 2.5 times the full load torque at about ( ) of synchronous speed.

  1. ((a))

    100%

  2. ((b))

    75%

  3. ((c))

    50%

  4. ((d))

    25%

Show Answer
Answer: ((a))

100%

22

In a network with multiple resistors, if the delta-star transformation is applied, what is the equivalent delta resistance for a star-connected set of resistors R1=6 Ω, R2=10Ω, and R3=15Ω ?

  1. ((a))

    R12=50Ω, R13=30Ω, R23=40Ω

  2. ((b))

    R12=30Ω, R13=20Ω, R23=40Ω

  3. ((c))

    R12=20Ω, R13=30Ω, R23=50Ω

  4. ((d))

    R12=40Ω, R13=20Ω, R23=50Ω

Show Answer
Answer: ((a))

R12=50Ω, R13=30Ω, R23=40Ω

23

Find the equivalent capacitance 'Ceq' in the following circuit.

  1. ((a))

    20μF

  2. ((b))

    35μF

  3. ((c))

    30μF

  4. ((d))

    25μF

Show Answer
Answer: ((a))

20μF

24

Calculate the power dissipated in the Zener diode in the following circuit.

  1. ((a))

    0.66 W

  2. ((b))

    0.88 W

  3. ((c))

    0.22 W

  4. ((d))

    0.04 W

Show Answer
Answer: ((a))

0.66 W

25

In an AC current-carrying conductor, the skin effect ( ) with the increase in diameter of the conductor and ( ) with the increase in frequency.

  1. ((a))

    increases, increases

  2. ((b))

    decreases, decreases

  3. ((c))

    decreases, increases

  4. ((d))

    increases, decreases

Show Answer
Answer: ((a))

increases, increases

26

Which of the following is the correct sequence of layers from the outermost to the innermost in underground cables?

  1. ((a))

    Serving → Armouring → Bedding → Metallic sheath → Conductor

  2. ((b))

    Bedding → Metallic sheath → Conductor → Serving → Armouring

  3. ((c))

    Conductor → Metallic sheath → Bedding → Armouring → Serving

  4. ((d))

    Metallic sheath → Bedding → Armouring → Serving → Conductor

Show Answer
Answer: ((a))

Serving → Armouring → Bedding → Metallic sheath → Conductor

27

Which of the following is a correct pair of LC oscillators?

  1. ((a))

    Crystal oscillator and Phase-shift oscillator

  2. ((b))

    Wien bridge oscillator and Phase-shift oscillator

  3. ((c))

    Colpitts oscillator and Hartley oscillator

  4. ((d))

    Wien bridge oscillator and Colpitts oscillator

Show Answer
Answer: ((a))

Crystal oscillator and Phase-shift oscillator

28

Assertion (A): Fixed charges in power generation remain constant regardless of the plant's capacity or operation.

Reason (R): Semi-fixed charges are dependent on the installed capacity of the plant and include costs like interest, depreciation, taxes, and insurance premiums.

  1. ((a))

    Both Assertion and Reason are true, but Reason is not the correct explanation of the Assertion

  2. ((b))

    Both Assertion and Reason are true, and Reason is the correct explanation of the Assertion.

  3. ((c))

    Assertion is false, but Reason is true.

  4. ((d))

    Assertion is true, but Reason is false.

Show Answer
Answer: ((a))

Both Assertion and Reason are true, but Reason is not the correct explanation of the Assertion

29

Find the voltage 'vo' in the following circuit.

  1. ((a))

    16 V

  2. ((b))

    20 V

  3. ((c))

    12 V

  4. ((d))

    24 V

Show Answer
Answer: ((a))

16 V

30

Which of the following statements is correct regarding the classification of transmission and distribution lines?

  1. ((a))

    Transmission lines carry electricity over long distances at high voltages, while distribution lines deliver electricity to end-users at lower voltages

  2. ((b))

    Both transmission and distribution lines operate at identical voltages, differing only in the type of conductor material used.

  3. ((c))

    Transmission lines are designed for short-distance electricity transfer, while distribution lines are specialized for long-distance power transmission.

  4. ((d))

    Transmission lines and distribution lines serve the same purpose and are interchangeable in the electrical grid.

Show Answer
Answer: ((a))

Transmission lines carry electricity over long distances at high voltages, while distribution lines deliver electricity to end-users at lower voltages

31

Match the Following

TermDefinition
1. PhaseA. The divisional part of a cycle through which the quantity moves forward from a selected origin.
2. Phase DifferenceB. The angular phase difference between the maximum possible value of two alternating quantities having the same frequency.
3. CycleC. When the alternating quantity goes through a complete set of positive or negative values or goes through 360∘ electrical degrees.
  1. ((a))

    1-B, 2-A, 3-C

  2. ((b))

    1-A, 2-B, 3-C

  3. ((c))

    1-C, 2-B, 3-A

  4. ((d))

    1-A, 2-C, 3-B

Show Answer
Answer: ((a))

1-B, 2-A, 3-C

32

A generating station has installed capacity of 50,000 kW and delivers (250×106) units per annum. If the annual fixed charges are ₹160 per kW installed capacity and running charges are 4 paise per kWh, determine the cost per unit generated.

  1. ((a))

    7.2 paise

  2. ((b))

    7.6 paise

  3. ((c))

    7.0 paise

  4. ((d))

    7.4 paise

Show Answer
Answer: ((a))

7.2 paise

33

A synchronous motor is said to be over-excited when:

  1. ((a))

    back EMF is zero

  2. ((b))

    back EMF is equal to the applied voltage

  3. ((c))

    back EMF is greater than the applied voltage

  4. ((d))

    back EMF is less than the applied voltage

Show Answer
Answer: ((a))

back EMF is zero

34

Match the Following:

TermDefinition
1. Norton's Theorema) Simplifies a network to an equivalent circuit consisting of a current source and a parallel resistance.
2. Thevenin's Theoremb) Simplifies a network to an equivalent circuit consisting of a voltage source and a series resistance.
3. Delta-Star Transformationc) Converts a delta-connected set of resistors to an equivalent star-connected configuration.
4. Maximum Power Transfer Theoremd) Determines the condition for maximum power transfer to a load resistor in a circuit.
  1. ((a))

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

  2. ((b))

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

  3. ((c))

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

  4. ((d))

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

Show Answer
Answer: ((a))

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

35

If the maximum demand on the plant is equal to the plant capacity, then the reserve capacity of the plant will be ( ).

  1. ((a))

    zero

  2. ((b))

    same as the maximum demand

  3. ((c))

    half of the maximum demand

  4. ((d))

    twice the maximum demand

Show Answer
Answer: ((a))

zero

36

Find the Norton's equivalent of the following circuit.

  1. ((a))

    IN=3 A, RN=12Ω

  2. ((b))

    IN=6 A, RN=12Ω

  3. ((c))

    IN=6 A, RN=3Ω

  4. ((d))

    IN=3 A, RN=3Ω

Show Answer
Answer: ((a))

IN=3 A, RN=12Ω

37

How do electrical connections differ in wiring diagrams compared to schematic diagrams?

  1. ((a))

    Wiring diagrams emphasise the flow of the system and power output, while schematic diagrams show the connections between devices.

  2. ((b))

    Wiring diagrams use lines to represent the wiring, while schematic diagrams use simplified shapes for connections.

  3. ((c))

    Wiring diagrams use abstract symbols for connections, while schematic diagrams represent the physical wiring.

  4. ((d))

    Wiring diagrams represent the logical working of a circuit, while schematic diagrams focus on the actual wiring connections.

Show Answer
Answer: ((a))

Wiring diagrams emphasise the flow of the system and power output, while schematic diagrams show the connections between devices.

38

The frequency of the sinusoidal voltage expressed as v(t)=50sin⁡80πt is ( ).

  1. ((a))

    60 Hz

  2. ((b))

    80 Hz

  3. ((c))

    20 Hz

  4. ((d))

    40 Hz

Show Answer
Answer: ((a))

60 Hz

39

In a series RL circuit, the phase difference between the voltage and current will ( ).

  1. ((a))

    always be 90°

  2. ((b))

    be between 0° and 90°

  3. ((c))

    always be 0°

  4. ((d))

    be between 90° and 180°

Show Answer
Answer: ((a))

always be 90°

40

In ring main distribution system, each distribution transformer is fed with ( ) feeder / feeders.

  1. ((a))

    four

  2. ((b))

    two

  3. ((c))

    only one

  4. ((d))

    three

Show Answer
Answer: ((a))

four

41

Which statement is incorrect for Tender?

  1. ((a))

    Price and quality are the components in Tender.

  2. ((b))

    Find out the best price.

  3. ((c))

    Large scope.

  4. ((d))

    Doesn't Response for request for tender.

Show Answer
Answer: ((a))

Price and quality are the components in Tender.

42

Which statement accurately describes the working principle of single-phase motors?

  1. ((a))

    The magnetic field produced by a single-phase motor "pulsates" between 2 motor poles, requiring an initial force for rotor movement.

  2. ((b))

    The stationary rotor in a single-phase motor experiences a continuous and smooth rotating magnetic field.

  3. ((c))

    Single-phase motors do not require any auxiliary influence for initial movement of the rotor

  4. ((d))

    Single-phase motors produce a true rotating magnetic field with 120 degrees of phase separation.

Show Answer
Answer: ((a))

The magnetic field produced by a single-phase motor "pulsates" between 2 motor poles, requiring an initial force for rotor movement.

43

Determine the energy stored by a 2 H inductor, when the current flowing through it is 4 A.

  1. ((a))

    16 J

  2. ((b))

    8 J

  3. ((c))

    32 J

  4. ((d))

    4 J

Show Answer
Answer: ((a))

16 J

44

Choose the correct pair of transformer type with correct application?

  1. ((a))

    Distribution Transformer: Component protection.

  2. ((b))

    Instrument Transformer: Measuring voltage, current

  3. ((c))

    Power transformer: Lanes for domestic purposes

  4. ((d))

    Protection Transformer: Generation stations

Show Answer
Answer: ((a))

Distribution Transformer: Component protection.

45

The magnetic force per unit length between two parallel current carrying conductors is ( ).

  1. ((a))

    inversely proportional to the distance between the conductors

  2. ((b))

    directly proportional to the distance between the conductors

  3. ((c))

    inversely proportional to the current flowing through the conductors

  4. ((d))

    directly proportional to the square of the distance between the conductors

Show Answer
Answer: ((a))

inversely proportional to the distance between the conductors

46

Select the correct pair of type of industrial heating and the way in which the heating is obtained.

  1. ((a))

    Resistance heating: Heating through dielectric losses

  2. ((b))

    Dielectric heating: Heating through electromagnetic radiation

  3. ((c))

    Induction heating: Heating through eddy currents

  4. ((d))

    Infrared heating: Heating through heavy current in a highly resistive element

Show Answer
Answer: ((a))

Resistance heating: Heating through dielectric losses

47

With reference to the shaded pole induction motor, state true/false for the following statements:

P : The shaded pole motor rotates in only one direction.

Q: In the shaded pole motor, the copper ring acts as a secondary winding for the motor.

  1. ((a))

    Statement P is true and statement Q is false.

  2. ((b))

    Statements P and Q both are false.

  3. ((c))

    Statement P is false and statement Q is true.

  4. ((d))

    Statements P and Q both are true.

Show Answer
Answer: ((a))

Statement P is true and statement Q is false.

48

In the questions given below, there are two statements marked as Assertion (A) and Reason (R). Mark your answer as per the codes provided below:

Assertion (A): Stepper motors are suitable for positioning applications where holding a position is essential, and they are generally less expensive.

Reason (R): Servomotors are true feedback positioners with encoders, providing precise control over motion and speed.

  1. ((a))

    Both Assertion and Reason are true, and Reason is the correct explanation of the Assertion

  2. ((b))

    Assertion is false, but Reason is true.

  3. ((c))

    Both Assertion and Reason are true, but Reason is not the correct explanation of the Assertion.

  4. ((d))

    Assertion is true, but Reason is false.

Show Answer
Answer: ((a))

Both Assertion and Reason are true, and Reason is the correct explanation of the Assertion

49

In a parallel RL circuit, the inductive susceptance is given by ( ).

  1. ((a))

    B=2ωL

  2. ((b))

    B=ωL

  3. ((c))

    B=1/ωL

  4. ((d))

    B=L/ω

Show Answer
Answer: ((a))

B=2ωL

50

The coils of a DC motor starter are wound with wire of Manganin because of the ( ) temperature coefficient of resistance and ( ) thermoelectric EMF, respectively.

  1. ((a))

    low, low

  2. ((b))

    high, high

  3. ((c))

    low, high

  4. ((d))

    high, low

Show Answer
Answer: ((a))

low, low

51

Which of the following motors divides the full rotation into equal number of steps?

  1. ((a))

    Universal motor

  2. ((b))

    Hysteresis motor

  3. ((c))

    Synchronous motor

  4. ((d))

    Stepper motor

Show Answer
Answer: ((a))

Universal motor

52

An overhead transmission line is supported by supports at equal levels. Assuming the weight per unit length and tension in the conductor constant, if the length of the conductor span is ( ) then the sag will decrease by 25%.

  1. ((a))

    increased by 25%

  2. ((b))

    increased by 50%

  3. ((c))

    reduced by 25%

  4. ((d))

    reduced by 50%

Show Answer
Answer: ((a))

increased by 25%

53

Which of the following application of CRO is incorrect?

  1. ((a))

    Generate the different type of electrical signals

  2. ((b))

    Measure the voltage, current, frequency, inductance, admittance, resistance and power factor.

  3. ((c))

    Monitor the signal properties as well as characteristics

  4. ((d))

    Control the analog signals

Show Answer
Answer: ((a))

Generate the different type of electrical signals

54

Which of the following is the most important factor governing the selection of an electric motor in electives among the following options?

  1. ((a))

    Ambient temperature of the place where the motor is mounted

  2. ((b))

    Maintenance cost of the motor

  3. ((c))

    Appearance of the motor

  4. ((d))

    Torque-speed characteristics of the motor

Show Answer
Answer: ((a))

Ambient temperature of the place where the motor is mounted

55

Explore the characteristics of outdoor cables and their suitability for different conditions. Assess the following statements and determine their correctness.

Statements:I. Outdoor cables are designed to be buried underground and can withstand exposure to harsh elements.

II. Underground Burial Cables, with water-blocking fillers or polymer gel, ensure long-term resistance to water infiltration into the core.

  1. ((a))

    Statements II alone is correct

  2. ((b))

    Statement I alone is correct

  3. ((c))

    Both Statements I and II together are incorrect

  4. ((d))

    Both Statements I and II together are correct

Show Answer
Answer: ((a))

Statements II alone is correct

56

Which of the given options best describes the truthfulness of the following statements?

P: Within the solenoid, the field lines are in the form of parallel straight lines.

Q : The field within the solenoid is uniform.

R : Both ends of the solenoid act as magnetic north poles.

  1. ((a))

    Only statements P and Q are correct

  2. ((b))

    Statements P, Q and R - all are correct

  3. ((c))

    Only statements Q and R are correct

  4. ((d))

    Only statements P and R are correct

Show Answer
Answer: ((a))

Only statements P and Q are correct

57

Select the option that is true regarding the following two statements labelled Assertion (A) and Reason (R).

(A): Synchronous motors can be used to improve the voltage regulation of the transmission lines.

(R): Synchronous motors are well suited where constant speed is required.

  1. ((a))

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

  2. ((b))

    Both statements A and R are false.

  3. ((c))

    Statement A is true, but statement R is false.

  4. ((d))

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

Show Answer
Answer: ((a))

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

58

Match the Following

FunctionDevice
1. Producing Electron beamC. Electron gun
2. Deflected beam appearB. Fluorescent screen
3. Synchronising the deflection of electron beamA. Trigger circuit
4. Generate different type of waveD. Function generator
  1. ((a))

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

  2. ((b))

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

  3. ((c))

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

  4. ((d))

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

Show Answer
Answer: ((a))

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

59

Find the voltage 'Vab' between terminals 'a' and 'b' in the following figure.

  1. ((a))

    7 V

  2. ((b))

    9 V

  3. ((c))

    3 V

  4. ((d))

    1 V

Show Answer
Answer: ((a))

7 V

60

What is the power consumption, in watts, of a 1/4HP motor, according to the provided information?

  1. ((a))

    X1.373 watts

  2. ((b))

    186 watts

  3. ((c))

    745.7 watts

  4. ((d))

    932.85 watts

Show Answer
Answer: ((a))

X1.373 watts

61

Which of the following statements are correct?

P: Biomass energy or fuel cannot be stored and distributed.

Q: The emissions from biomass energy generation can potentially pollute the environment.

R: Biomass power plants that use pyrolysis are more efficient than direct combustion power plants.

  1. ((a))

    Only statements P and Q are correct

  2. ((b))

    Statements P,Q and R- all are correct

  3. ((c))

    Only statements P and R are correct

  4. ((d))

    Only statements Q and R are correct

Show Answer
Answer: ((a))

Only statements P and Q are correct

62

Which of the following equations is correct according to the given parallel circuit?

  1. ((a))

    E=ER/EL

  2. ((b))

    1=IR/IL

  3. ((c))

    I=IR+IL

  4. ((d))

    E=ER+EL

Show Answer
Answer: ((a))

E=ER/EL

63

With reference to DC arc welding, which of the following statements is INCORRECT?

  1. ((a))

    It is costlier than AC arc welding.

  2. ((b))

    It cannot be used for nonferrous metals

  3. ((c))

    The operation is noisy

  4. ((d))

    The arc is stable

Show Answer
Answer: ((a))

It is costlier than AC arc welding.

64

What type of component in an electrical circuit has to be used to deliver power or process electrical signals?

  1. ((a))

    Linear component

  2. ((b))

    Passive component

  3. ((c))

    Unilateral component

  4. ((d))

    Active component

Show Answer
Answer: ((a))

Linear component

65

Which of the following pairs of typical diodes and their corresponding threshold voltages is correct?

  1. ((a))

    Schottky diode: 2 V

  2. ((b))

    Light-emitting diode : 0.1 V

  3. ((c))

    Germanium diode : 0.9 V

  4. ((d))

    Silicon diode : 0.7 V

Show Answer
Answer: ((a))

Schottky diode: 2 V

66

Explore the components and systems related to the thermal power plant. Assess the following statements and determine their correctness.\nStatements:\nI. Ash handling plants (AHPs) remove ash from furnace ash hoppers, convey it through mechanical, hydraulic, or pneumatic transport, and dispose of the stored ash.\nII. The electrical thermal plant involves supplying medium voltage, low voltage, and direct current power to all loads in the power plant, covering aspects from power evacuation to switchyard control.

  1. ((a))

    Both Statements I and II together are incorrect

  2. ((b))

    Both Statements I and II together are correct

  3. ((c))

    Statements II is correct

  4. ((d))

    Statement I alone is correct

Show Answer
Answer: ((a))

Both Statements I and II together are incorrect

67

A 240-V DC shunt motor has an armature resistance of 0.25Ω and runs at 1000 RPM, taking an armature current of 40 A. It is desired to reduce the speed to 800 RPM. If the armature current remains the same, find the additional resistance to be connected in series with the armature circuit.

  1. ((a))

    1.75Ω

  2. ((b))

    1.25Ω

  3. ((c))

    1.65Ω

  4. ((d))

    1.15Ω

Show Answer
Answer: ((a))

1.75Ω

68

Which of the following is a VALID disadvantage of single bus bar system?

  1. ((a))

    High fault current

  2. ((b))

    High cost

  3. ((c))

    Complex operation

  4. ((d))

    High maintenance

Show Answer
Answer: ((a))

High fault current

69

Under no-load conditions, if the frequency of the AC supply is decreased while maintaining a constant magnetic flux in a single-phase transformer, what is the anticipated impact on the induced voltage in the secondary winding?

  1. ((a))

    The induced voltage undergoes a linear increase

  2. ((b))

    The induced voltage demonstrates a sinusoidal variation

  3. ((c))

    The induced voltage experiences a linear decrease

  4. ((d))

    The induced voltage remains constant

Show Answer
Answer: ((a))

The induced voltage undergoes a linear increase

70

Which of the following is NOT a valid disadvantage of shaded-pole type single-phase induction motor?

  1. ((a))

    Low starting torque

  2. ((b))

    Low power factor

  3. ((c))

    High cost

  4. ((d))

    High losses

Show Answer
Answer: ((a))

Low starting torque

71

A 36-pole alternator running at a speed of □( ) RPM will produce a frequency of 60 Hz.

  1. ((a))

    400

  2. ((b))

    200

  3. ((c))

    600

  4. ((d))

    300

Show Answer
Answer: ((a))

400

72

Which of the following distribution systems is considered common?

  1. ((a))

    Overhead and underground systems

  2. ((b))

    Radial, ring mains and interconnected systems

  3. ((c))

    AC and DC distribution systems

  4. ((d))

    Open and insulated conductor systems

Show Answer
Answer: ((a))

Overhead and underground systems

73

Which of the following oscillators is generally considered a fixed frequency oscillator?

  1. ((a))

    Phase-shift oscillator

  2. ((b))

    Hartley oscillator

  3. ((c))

    Wien-bridge oscillator

  4. ((d))

    Crystal oscillator

Show Answer
Answer: ((a))

Phase-shift oscillator

74

With reference to the methods of determination of voltage regulation of smooth cylindrical rotor type alternators, which of the following methods is known as zero-power factor method?

  1. ((a))

    Synchronous impedance method

  2. ((b))

    Direct loading method

  3. ((c))

    Potier method

  4. ((d))

    Ampere-turn method

Show Answer
Answer: ((a))

Synchronous impedance method

75

Determine the total charge transferred over the time interval of 0≤t≤10 s, when the current is given as i(t)=0.5t A.

  1. ((a))

    50C

  2. ((b))

    10 C

  3. ((c))

    25 C

  4. ((d))

    5 C

Show Answer
Answer: ((a))

50C

76

What is the mathematical representation of solid angle (ω) in terms of area (A) and radius (r)?

  1. ((a))

    ω=r/A^2

  2. ((b))

    ω=A/r^2

  3. ((c))

    ω=A/r

  4. ((d))

    ω=Ar^2/2

Show Answer
Answer: ((a))

ω=r/A^2

77

What will be the main consideration in quotation of any electrical installation?

  1. ((a))

    Designing of component

  2. ((b))

    Quality of component

  3. ((c))

    Pricing of component

  4. ((d))

    Type of bid

Show Answer
Answer: ((a))

Designing of component

78

In a transformer, the core loss is found to be 52 W at 40 Hz and 90 W at 60 Hz, measured at same peak flux density. Compute the eddy current loss at 50 Hz.

  1. ((a))

    25 W

  2. ((b))

    55 W

  3. ((c))

    35 W

  4. ((d))

    45 W

Show Answer
Answer: ((a))

25 W

79

Which of the following is a passive electronic component?

  1. ((a))

    Photo diode

  2. ((b))

    Operational amplifier

  3. ((c))

    Capacitor

  4. ((d))

    Transistor

Show Answer
Answer: ((a))

Photo diode

80

Explore the components and systems related to the thermal power plant. Assess the following statements and determine their correctness. Statements:

I. Water economizers in boiler installations increase efficiency by utilizing the heat of exhaust gases.

II. The electrical thermal plant involves supplying medium voltage, low voltage, and direct current power to all loads in the power plant, covering aspects from power evacuation to switchyard control.

  1. ((a))

    Statement I alone is correct

  2. ((b))

    Statements II is correct

  3. ((c))

    Both Statements I and II together are incorrect

  4. ((d))

    Both Statements I and II together are correct

Show Answer
Answer: ((a))

Statement I alone is correct

81

Two long parallel conductors, each one carrying current 100 A, flowing in the same direction, are separated by 1 cm in air. Find the force per metre length of the conductor.

  1. ((a))

    2.0 N/m attractive force

  2. ((b))

    2.0 N/m repulsive force

  3. ((c))

    0.2 N/m repulsive force

  4. ((d))

    0.2 N/m attractive force

Show Answer
Answer: ((a))

2.0 N/m attractive force

82

What is the significance of Rule 29 in the Indian Electricity Rules, 2005, regarding electrical installations?

  1. ((a))

    It defines the safety measures for the installation, protection, and maintenance of electrical systems.

  2. ((b))

    It details the guidelines for the Bureau of Indian Standards related to electrical engineering.

  3. ((c))

    It outlines the regulations for estimating and costing in electrical projects.

  4. ((d))

    It specifies the requirements for planning electrical circuits

Show Answer
Answer: ((a))

It defines the safety measures for the installation, protection, and maintenance of electrical systems.

83

In a cathode-ray tube, the focusing anode is positioned between the □( ).

  1. ((a))

    pre-accelerating anode and accelerating anode

  2. ((b))

    horizontal and vertical deflection plates

  3. ((c))

    control grid and pre-accelerating anode

  4. ((d))

    accelerating anode and vertical deflection plates

Show Answer
Answer: ((a))

pre-accelerating anode and accelerating anode

84

Which of the given options best describes the truthfulness of the following statements with reference to mechanical draught and natural draught in a thermal power plant?

P: Mechanical draught is independent of atmospheric temperature.

Q: In case of natural draught, the chimney height is more.

  1. ((a))

    P: False, Q: True

  2. ((b))

    P: True, Q: False

  3. ((c))

    P: True, Q: True

  4. ((d))

    P: False, Q: False

Show Answer
Answer: ((a))

P: False, Q: True

85

Match the following terms with their correct formula in the context of work (W), power(P), and energy(E):

TermFormula/Units
1. Electrical Energy Formulaa) V*I watts
2. Electrical Power formulab) I^2 R*t
3. Basic Units of Electrical Energyc) Joule
4. Basic units of Electrical Powerd) Joule/Sec
  1. ((a))

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

  2. ((b))

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

  3. ((c))

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

  4. ((d))

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

Show Answer
Answer: ((a))

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

86

What component, integral to electrostatics, is designed to accumulate and discharge electrical energy by utilizing the electric field between two conductive plates?

  1. ((a))

    Capacitors

  2. ((b))

    Transformers

  3. ((c))

    Inductors

  4. ((d))

    Resistors

Show Answer
Answer: ((a))

Capacitors

87

A potential barrier of 0.7 V exists across a PN-junction. Calculate the intensity of the electric field in the depletion region, if the width of the depletion region is (3.5×10-7 m.

  1. ((a))

    (0.2×106 )V/m

  2. ((b))

    (0.2×104 )V/m

  3. ((c))

    (2×106 )V/m

  4. ((d))

    (2×104 )V/m

Show Answer
Answer: ((a))

(0.2×106 )V/m

88

Under what conditions does an alternator exhibit a zero-voltage regulation?

  1. ((a))

    At unity power factor

  2. ((b))

    At a certain leading power factor

  3. ((c))

    At lower leading power factors

  4. ((d))

    At lagging power factor

Show Answer
Answer: ((a))

At unity power factor

89

Which of the following statements is INCORRECT?

  1. ((a))

    Commercial electrical systems operate at higher voltage levels.

  2. ((b))

    Commercial properties typically require a three-phase electrical supply to meet higher power demands.

  3. ((c))

    Commercial setups often utilise conduit-based wiring methods for easier maintenance.

  4. ((d))

    Commercial installations are cheaper and easier to maintain.

Show Answer
Answer: ((a))

Commercial electrical systems operate at higher voltage levels.

90

In a complex electrical network, applying Norton's Theorem involves finding the Norton current and Norton equivalent resistance. What is the Norton equivalent resistance for a network with resistances R1=8Ω and R2=12Ω in parallel?

  1. ((a))

    2.4Ω

  2. ((b))

    4.8Ω

  3. ((c))

    20Ω

  4. ((d))

    12.6Ω

Show Answer
Answer: ((a))

2.4Ω

91

Find the voltage ' v1 ' in the following circuit.

  1. ((a))

    -8 V

  2. ((b))

    8 V

  3. ((c))

    -12 V

  4. ((d))

    12 V

Show Answer
Answer: ((a))

-8 V

92

Which of the following statements about the torque vs. armature current (Ta-la) characteristic of DC series motors is correct?

  1. ((a))

    The shaft torque (Tsh) is greater than armature torque (Ta) due to stray losses.

  2. ((b))

    After magnetic saturation, the Ta-la curve becomes a parabola.

  3. ((c))

    The Ta-la curve is a parabola for smaller values of armature current before magnetic saturation.

  4. ((d))

    In DC series motors, torque varies inversely with armature current after magnetic saturation.

Show Answer
Answer: ((a))

The shaft torque (Tsh) is greater than armature torque (Ta) due to stray losses.

93

What is the primary difference between Avalanche breakdown and Zener breakdown in a p-n junction diode?

  1. ((a))

    Both breakdowns occur due to the rapid collision of electrons

  2. ((b))

    Zener breakdown is irreversible, while Avalanche breakdown is reversible

  3. ((c))

    Avalanche breakdown is a controlled version of Zener breakdown.

  4. ((d))

    Avalanche breakdown is irreversible, while Zener breakdown is reversible.

Show Answer
Answer: ((a))

Both breakdowns occur due to the rapid collision of electrons

94

Match the transistor configuration with the corresponding output resistance of the configuration.

Transistor ConfigurationCorresponding Output Resistance
(i) Common emitter(c) High
(ii) Common collector(a) Low
(iii) Common base(b) Very High
  1. ((a))

    (i)-(a), (ii)-(b), (iii)-(c)

  2. ((b))

    (i)-(b), (ii)-(c), (iii)-(a)

  3. ((c))

    (i)-(c), (ii)-(a), (iii)-(b)

  4. ((d))

    (i)-(c), (ii)-(b), (iii)-(a)

Show Answer
Answer: ((a))

(i)-(a), (ii)-(b), (iii)-(c)

95

Which of the following statements is INCORRECT for the superposition theorem?

  1. ((a))

    It is used to find voltages and currents.

  2. ((b))

    It is applicable to linear circuits.

  3. ((c))

    It is applicable to bilateral circuits.

  4. ((d))

    It is applicable if the circuit involves nonlinear elements such as diodes

Show Answer
Answer: ((a))

It is used to find voltages and currents.

96

The impedance of a series RL circuit is 130Ω. If the inductive reactance (X_L ) in the circuit is 50Ω, find the value of the resistance.

  1. ((a))

    80Ω

  2. ((b))

    120Ω

  3. ((c))

    180Ω

  4. ((d))

    90Ω

Show Answer
Answer: ((a))

80Ω

97

In a 3-wire DC system, in order to maintain voltages on the two sides of the neutral equal to each other, a/an □( ) is used.

  1. ((a))

    amplifier

  2. ((b))

    booster

  3. ((c))

    diverter

  4. ((d))

    balancer set

Show Answer
Answer: ((a))

amplifier

98

Which of the following is NOT a diamagnetic material?

  1. ((a))

    Iron

  2. ((b))

    Bismuth

  3. ((c))

    Silicon

  4. ((d))

    Lead

Show Answer
Answer: ((a))

Iron

99

What is the term used to describe the combination of a transmission line's resistance, inductance, and capacitance, influencing the voltage drop along the line and its ability to transfer power efficiently?

  1. ((a))

    Voltage Level

  2. ((b))

    Line Configuration

  3. ((c))

    Line Losses

  4. ((d))

    Line Impedance

Show Answer
Answer: ((a))

Voltage Level

100

In a Cathode Ray Tube (CRT) used for frequency comparison, how are the electrons deflected to compare frequencies?

  1. ((a))

    Both on the horizontal and vertical axes.

  2. ((b))

     Along the vertical axis, but not on the horizontal axis.

  3. ((c))

    Along the horizontal axis, but not on the vertical axis.

  4. ((d))

     Alternating between the horizontal and the vertical axes.

Show Answer
Answer: ((a))

Both on the horizontal and vertical axes.

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