Official Paper

SSC JE Electrical 4 Dec 2023 Official Paper II (Previous Year Paper)

100 questions · 120 minutes · with answers · free

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General Engineering (100 questions)

1

Non-reactive loads of 10 kW, 8 kW and 5 kW are connected between the neutral and the red, yellow, and blue phases, respectively, of a 3- phase, 4-wire system. The line voltage is 400 V. Calculate the current IR.  

  1. ((a))

    34.6 A

  2. ((b))

    43.3 A

  3. ((c))

    18.9 A

  4. ((d))

    21.6 A

Show Answer
Answer: ((a))

34.6 A

2

Which method of electrical heating involves passing electrical energy through a heating element to generate heat, which is then transferred to the substance to be heated? 

  1. ((a))

    Induction heating 

  2. ((b))

    Direct arc heating 

  3. ((c))

    Power frequency heating 

  4. ((d))

    Resistance heating 

Show Answer
Answer: ((a))

Induction heating 

3

Find the value of Load resistance(RL) for maximum power transfer in the following circuit. 

  1. ((a))

    11 Ω

  2. ((b))

    22 Ω

  3. ((c))

    33 Ω

  4. ((d))

    9 Ω

Show Answer
Answer: ((a))

11 Ω

4

In a parallel RC circuit, the phase difference between the applied voltage and the voltage across R and C in parallel will be _____.

  1. ((a))

    45°

  2. ((b))

    30°

  3. ((c))

    0°

  4. ((d))

    90°

Show Answer
Answer: ((a))

45°

5

For a certain D-MOSFET, IDSS = 10 mA and VGS(off) = -8 V. Calculate ID at VGS = -4 V.

  1. ((a))

    20 mA

  2. ((b))

    2.5 mA

  3. ((c))

    50 mA

  4. ((d))

    5 mA

Show Answer
Answer: ((a))

20 mA

6

What type of transmission line is characterised by a length ranging from 80 km to 240 km and includes both inductance and capacitance effects? 

  1. ((a))

    Short transmission line 

  2. ((b))

    Long transmission line 

  3. ((c))

    DC transmission line 

  4. ((d))

    Medium transmission line  

Show Answer
Answer: ((a))

Short transmission line 

7

What is one of the functions of circuit breakers in a substation? 

  1. ((a))

    Switching equipment control 

  2. ((b))

    Interrupting short-circuits and overload currents 

  3. ((c))

    Voltage regulation 

  4. ((d))

    Power generation 

Show Answer
Answer: ((a))

Switching equipment control 

8

Which component of the total cost of electrical energy is proportional to the energy generated (kWh)? 

  1. ((a))

    Fixed cost 

  2. ((b))

    Running cost 

  3. ((c))

    Depreciation cost 

  4. ((d))

    Semi-fixed cost 

Show Answer
Answer: ((a))

Fixed cost 

9

Which types of losses in a transformer are equal to each other, resulting in maximum efficiency of the transformer? 

  1. ((a))

    Core loss and hysteresis loss 

  2. ((b))

    Eddy current loss and mechanical loss 

  3. ((c))

    Iron loss and copper loss 

  4. ((d))

    Copper loss and winding loss 

Show Answer
Answer: ((a))

Core loss and hysteresis loss 

10

Identify whether the following statements with reference to magnetic circuits are true or false.

  1. Magnetic flux lines never intersect.
  2. Each line of a magnetic flux is a closed loop by itself.
  1. ((a))

    Both the statements are true  

  2. ((b))

    Both the statements are false 

  3. ((c))

    Statement 1 is true and statement 2 is false 

  4. ((d))

    Statement 1 is false and statement 2 is true 

Show Answer
Answer: ((a))

Both the statements are true  

11

In a balanced star connection, the ratio of the magnitude of the line voltage to the magnitude of the phase voltage is 

  1. ((a))

    √2

  2. ((b))

    13\frac{1}{\sqrt3}

  3. ((c))

    √3

  4. ((d))

    12\frac{1}{\sqrt2}

Show Answer
Answer: ((a))

√2

12

Which part of a DC motor is responsible for creating the mechanical revolutions of the unit? 

  1. ((a))

    Rotor 

  2. ((b))

    Brushes 

  3. ((c))

    Commutator 

  4. ((d))

    Stator 

Show Answer
Answer: ((a))

Rotor 

13

Identify whether the following statements related to starters in DC motors are true or false.

  1. In a three-point starter, electromagnets are used as overload release coil.
  2. Two-point starters are used with DC series motors.
  1. ((a))

    Both the statements are false 

  2. ((b))

    Statement 1 is true and statement 2 is false 

  3. ((c))

    Both the statements are true 

  4. ((d))

    Statement 1 is false and statement 2 is true 

Show Answer
Answer: ((a))

Both the statements are false 

14

If a current of 2 A flowing through one coil produces flux linkage of 5 Wb-turn in the other coil, then what will be the mutual inductance between the two coils?  

  1. ((a))

    7.5 H

  2. ((b))

    10 H

  3. ((c))

    2.5 H

  4. ((d))

    5 H

Show Answer
Answer: ((a))

7.5 H

15

The voltage gain in common collector configuration of a BJT is _______.

  1. ((a))

    less than one 

  2. ((b))

    zero

  3. ((c))

    between 50 and 100 

  4. ((d))

    above 100 

Show Answer
Answer: ((a))

less than one 

16

Two coils having self-inductance of 6 H and 24 H, respectively, are magnetically coupled. Find the maximum possible value of mutual inductance. 

  1. ((a))

    24 H

  2. ((b))

    18 H

  3. ((c))

    6 H

  4. ((d))

    12 H

Show Answer
Answer: ((a))

24 H

17

With reference to PMMC instruments, which of the following statements are correct?

I. For PMMC instruments, the scale is not uniform.

Il. PMMC instruments can be used for AC as well as DC quantities.

III. In PMMC instruments, power consumption is low.

IV. PMMC instruments offer a high torque/weight ratio.

  1. ((a))

    I and II

  2. ((b))

    II and IV

  3. ((c))

    III and IV

  4. ((d))

    I and III

Show Answer
Answer: ((a))

I and II

18

Which type of motor requires a DC supply to the rotor to generate the rotor’s magnetic field and uses damper windings for starting? 

  1. ((a))

    Reluctance Motor 

  2. ((b))

    Permanent Magnet Synchronous Motor 

  3. ((c))

    Direct Current Excited Motor 

  4. ((d))

    Three-Phase Induction Motor 

Show Answer
Answer: ((a))

Reluctance Motor 

19

What is the function of the ‘control system’ component in a load drive system? 

  1. ((a))

    To provide electrical power to the load 

  2. ((b))

    To convert electrical energy into mechanical energy 

  3. ((c))

    To measure the temperature of the load 

  4. ((d))

    To regulate the operation of the load drive 

Show Answer
Answer: ((a))

To provide electrical power to the load 

20

Which of the following theorems is the dual of Norton’s theorem? 

  1. ((a))

    Thevenin’s theorem 

  2. ((b))

    Reciprocity theorem 

  3. ((c))

    Maximum power transfer theorem 

  4. ((d))

    Superposition theorem  

Show Answer
Answer: ((a))

Thevenin’s theorem 

21

Identify the type of single-phase motor shown in the following figure. 

  1. ((a))

    Permanent-split capacitor 

  2. ((b))

    Capacitor-start motor 

  3. ((c))

    Split-phase induction motor 

  4. ((d))

    Shaded pole motor 

Show Answer
Answer: ((a))

Permanent-split capacitor 

22

Match the oscillator circuits in column A with their respective characteristics in column B. 

Column AColumn B
A.Hartley oscillatorI.Two stage RC coupled amplifier
B.Crystal oscillatorII.LC tuned circuit
C.Wien bridge oscillatorIII.Greater stability
  1. ((a))

    A - I, B - III, C - II

  2. ((b))

    A - II, B - I, C - III

  3. ((c))

    A - III, B - I, C - II

  4. ((d))

    A - II, B - III, C - I

Show Answer
Answer: ((a))

A - I, B - III, C - II

23

Which type of work is done by an autotransformer? 

  1. ((a))

    Phase shifting primary to secondary 

  2. ((b))

    Isolation between primary to secondary 

  3. ((c))

    Multiple windings 

  4. ((d))

    Adjustment of voltage in output side 

Show Answer
Answer: ((a))

Phase shifting primary to secondary 

24

Which type of transformer uses a ring or doughnut-shaped core material, offering low leakage inductance and high inductance and Q factors? 

  1. ((a))

    Air core transformer 

  2. ((b))

    Toroidal core transformer 

  3. ((c))

    Ferrite core transformer 

  4. ((d))

    Iron core transformer 

Show Answer
Answer: ((a))

Air core transformer 

25

Which component of a commercial electrical installation is responsible for protection against electrical overloads and short circuits?  

  1. ((a))

    Power sockets 

  2. ((b))

    Lighting systems 

  3. ((c))

    HVAC systems 

  4. ((d))

    Electrical panels or switchgear 

Show Answer
Answer: ((a))

Power sockets 

26

Find the current ‘i3’ in the following diagram. 

  1. ((a))

    7 A

  2. ((b))

    5 A

  3. ((c))

    11 A

  4. ((d))

    3 A

Show Answer
Answer: ((a))

7 A

27

In a DC series motor, what is the relationship between speed and armature current? 

  1. ((a))

    Speed is independent of armature current. 

  2. ((b))

    Speed is directly proportional to armature current. 

  3. ((c))

    Speed is directly proportional to the square of armature current. 

  4. ((d))

    Speed is inversely proportional to armature current. 

Show Answer
Answer: ((a))

Speed is independent of armature current. 

28

What is the application of overexcited synchronous motors? 

  1. ((a))

    Operating centrifugal pumps 

  2. ((b))

    Controlling voltage at the end of long transmission lines 

  3. ((c))

    Power factor correction for lagging loads 

  4. ((d))

    Generating different frequencies 

Show Answer
Answer: ((a))

Operating centrifugal pumps 

29

What type of substation is responsible for transferring power from the transmission system to the distribution system of an area? 

  1. ((a))

    Relay substation 

  2. ((b))

    Collector substation 

  3. ((c))

    Distribution substation 

  4. ((d))

    Converter substation 

Show Answer
Answer: ((a))

Relay substation 

30

In a single-phase series RL circuit, XL = 15 Ω and R = 20 Ω. Find the impedance of the circuit.

  1. ((a))

    15 Ω

  2. ((b))

    20 Ω

  3. ((c))

    25 Ω

  4. ((d))

    35 Ω

Show Answer
Answer: ((a))

15 Ω

31

What are the two types of breakdowns that can occur in p-n junctions? 

  1. ((a))

    Avalanche and tunnelling breakdowns 

  2. ((b))

    Forward and reverse breakdowns 

  3. ((c))

    Zener and capacitive breakdowns 

  4. ((d))

    Voltage and current breakdowns 

Show Answer
Answer: ((a))

Avalanche and tunnelling breakdowns 

32

Find the voltage across R3 in the following circuit. 

  1. ((a))

    4.5 V

  2. ((b))

    1.5 V

  3. ((c))

    7.5 V

  4. ((d))

    2.5 V

Show Answer
Answer: ((a))

4.5 V

33

Usually, the expenditure on supervision charges is ________ of the total cost. 

  1. ((a))

    5% to 7%

  2. ((b))

    2% to 4%

  3. ((c))

    8% to 10%

  4. ((d))

    1% to 1.5%

Show Answer
Answer: ((a))

5% to 7%

34

Which type of water turbine is generally suitable for high-head, low-flow applications? 

  1. ((a))

    Cross-flow turbine 

  2. ((b))

    Kaplan turbine 

  3. ((c))

    Pelton turbine 

  4. ((d))

    Francis turbine 

Show Answer
Answer: ((a))

Cross-flow turbine 

35

Given a 250 : 5 current transformer used with an ammeter reading of 2.7 A, what is the line current (primary current) in the circuit? 

  1. ((a))

    250 A

  2. ((b))

    135 A

  3. ((c))

    84 A

  4. ((d))

    36 A

Show Answer
Answer: ((a))

250 A

36

With reference to tenders, which of the following statements is INCORRECT? 

  1. ((a))

    Tenders are invited on a tender form prescribed by the purchase department. 

  2. ((b))

    The earnest money is never returned to the unsuccessful contractors after disposal of the tender. 

  3. ((c))

    The sealed tenders are invited publicly through news-papers. 

  4. ((d))

    Normally, the tender offering the lowest rates is accepted. 

Show Answer
Answer: ((a))

Tenders are invited on a tender form prescribed by the purchase department. 

37

Which of the following statements is INCORRECT for a reluctance motor? 

  1. ((a))

    A reluctance motor is cheaper than any other kind of synchronous motor. 

  2. ((b))

    A reluctance motor has poor efficiency. 

  3. ((c))

    A reluctance motor can operate on AC as well as DC supply. 

  4. ((d))

    The rotor of a reluctance motor rotates with constant speed. 

Show Answer
Answer: ((a))

A reluctance motor is cheaper than any other kind of synchronous motor. 

38

What is the primary purpose of control rods in a nuclear reactor? 

  1. ((a))

    To generate electricity 

  2. ((b))

    To absorb excess neutrons 

  3. ((c))

    To transfer heat to the secondary circuit 

  4. ((d))

    To cool the reactor core 

Show Answer
Answer: ((a))

To generate electricity 

39

The direction of rotation of a conductor in a _______ is obtained by Fleming’s left-hand rule.  

  1. ((a))

    alternator 

  2. ((b))

    DC motor 

  3. ((c))

    DC generator 

  4. ((d))

    transformer 

Show Answer
Answer: ((a))

alternator 

40

If the voltage across a 5 μF capacitor is 24 V at t = 6 ms, what is the energy stored in the capacitor at that time? 

  1. ((a))

    720 mJ

  2. ((b))

    1440 μJ

  3. ((c))

    120 mJ

  4. ((d))

    360 μJ

Show Answer
Answer: ((a))

720 mJ

41

Which part of a transistor is heavily doped and emits majority carriers, either electrons or holes? 

  1. ((a))

    Collector

  2. ((b))

    Emitter 

  3. ((c))

    Base and emitter 

  4. ((d))

    Base 

Show Answer
Answer: ((a))

Collector

42

Identify whether the following statements are true or false.

I. There is no skin effect in the DC transmission system.

Il. In DC transmission, corona losses are very large.

  1. ((a))

    Statement 1 is true and statement 2 is false 

  2. ((b))

    Both the statements are false 

  3. ((c))

    Both the statements are true 

  4. ((d))

    Statement 1 is false and statement 2 is true 

Show Answer
Answer: ((a))

Statement 1 is true and statement 2 is false 

43

What is the quality factor for the given series resonance circuit? 

  1. ((a))

    160

  2. ((b))

    80

  3. ((c))

    320

  4. ((d))

    40

Show Answer
Answer: ((a))

160

44

Calculate the speed of the 8-pole alternator if the supply frequency is 50 Hz. 

  1. ((a))

    1500 rpm

  2. ((b))

    1000 rpm

  3. ((c))

    500 rpm

  4. ((d))

    750 rpm

Show Answer
Answer: ((a))

1500 rpm

45

In a multi-plate capacitor, there are a total of nine plates in parallel. This arrangement is equivalent to _______ capacitors in parallel. 

  1. ((a))

    nine

  2. ((b))

    eight

  3. ((c))

    four

  4. ((d))

    ten

Show Answer
Answer: ((a))

nine

46

Which of the following is a limitation of Millman’s theorem? 

  1. ((a))

    Applicable if the circuit has no independent sources 

  2. ((b))

    Applicable if the circuit has only one independent source 

  3. ((c))

    Applicable if the circuit has no dependent sources 

  4. ((d))

    Applicable if the circuit has no resistance between the independent sources 

Show Answer
Answer: ((a))

Applicable if the circuit has no independent sources 

47

What will be the self-inductance of the coil if an EMF of 10 V is induced in it when the current flowing through it changes at the rate of 5 A/sec?  

  1. ((a))

    5 H

  2. ((b))

    10 H

  3. ((c))

    1 H

  4. ((d))

    2 H

Show Answer
Answer: ((a))

5 H

48

What is a common technique used to reduce core losses and the magnetising component in a current transformer? 

  1. ((a))

    Utilising laminated cores made of insulated sheets  

  2. ((b))

    Decreasing the number of windings in the secondary coil 

  3. ((c))

    Increasing the turns ratio of the current transformer 

  4. ((d))

    Using thicker core materials for better conductivity 

Show Answer
Answer: ((a))

Utilising laminated cores made of insulated sheets  

49

Identify whether the following statements are true or false.

  1. Capacitor start motors are more costly than split-phase induction motors. 
  2. In two-value capacitor motors, the two capacitors are connected in parallel at the starting.
  1. ((a))

    Statement 1 is false and statement 2 is true 

  2. ((b))

    Statement 1 is true and statement 2 is false 

  3. ((c))

    Both the statements are false  

  4. ((d))

    Both the statements are true 

Show Answer
Answer: ((a))

Statement 1 is false and statement 2 is true 

50

Which field control method for a DC series motor involves shunting a portion of motor current around the series field to reduce the field flux and increase the speed of the motor? 

  1. ((a))

    Tapped field control 

  2. ((b))

    Armature control method 

  3. ((c))

    Field diverter method 

  4. ((d))

    Rheostatic control method 

Show Answer
Answer: ((a))

Tapped field control 

51

What is the advantage of overhead cables compared to underground cables in terms of construction?  

  1. ((a))

    Overhead cables are more protected against moisture and corrosion. 

  2. ((b))

    Overhead cables are more environmentally friendly.  

  3. ((c))

    Overhead cables are less expensive to construct. 

  4. ((d))

    Overhead cables are better insulated.

Show Answer
Answer: ((a))

Overhead cables are more protected against moisture and corrosion. 

52

Which type of electromagnetic radiation is primarily used in infrared heating to heat surfaces? 

  1. ((a))

    Infrared radiation 

  2. ((b))

    X-rays 

  3. ((c))

    Microwave radiation  

  4. ((d))

    Ultraviolet radiation 

Show Answer
Answer: ((a))

Infrared radiation 

53

How does armature reaction affect the main field flux in an alternator when the load has a power factor of zero leading?  

  1. ((a))

    Armature reaction distorts the main field flux and does not affect its strength. 

  2. ((b))

    Armature reaction distorts the main field flux and weakens it. 

  3. ((c))

    Armature reaction strengthens the main field flux and does not distort it. 

  4. ((d))

    Armature reaction weakens the main field flux and reduces the generated EMF. 

Show Answer
Answer: ((a))

Armature reaction distorts the main field flux and does not affect its strength. 

54

Which type of single-phase motor is known as a ‘resistance-start' motor? 

  1. ((a))

    Shaded-pole motor 

  2. ((b))

    Universal motor 

  3. ((c))

    Split-phase motor 

  4. ((d))

    Permanent-split capacitor motor  

Show Answer
Answer: ((a))

Shaded-pole motor 

55

Which of the following statements is correct regarding the doping levels of the emitter, base and collector regions in a bipolar junction transistor (BJT)? 

  1. ((a))

    The doping levels of the emitter, base and collector are all the same. 

  2. ((b))

    The emitter is lightly doped, the base is heavily doped and the collector is moderately doped. 

  3. ((c))

    The emitter is moderately doped, the base is heavily doped and the collector is lightly doped. 

  4. ((d))

    The emitter is heavily doped, the base is lightly doped and the collector is moderately doped. 

Show Answer
Answer: ((a))

The doping levels of the emitter, base and collector are all the same. 

56

Which of the following terms is NOT related to nuclear power plants? 

  1. ((a))

    Control rod 

  2. ((b))

    Electrostatic precipitator 

  3. ((c))

    Nuclear reactor 

  4. ((d))

    Moderator 

Show Answer
Answer: ((a))

Control rod 

57

For C = 101.5 nF, determine L for the series resonant circuit if the resonant frequency is 2800 Hz. 

  1. ((a))

    31.83 mH

  2. ((b))

    16.32 mH

  3. ((c))

    46.45 mH

  4. ((d))

    26.56 mH

Show Answer
Answer: ((a))

31.83 mH

58

What are the zero power factor characteristics (ZPFC) used for in the context of alternators?  

  1. ((a))

    To calculate the short-circuit voltage of the alternator 

  2. ((b))

    To determine the synchronous speed of the alternator 

  3. ((c))

    To plot the armature terminal voltage per phase against field current 

  4. ((d))

    To assess the power factor when the alternator is loaded by reactors 

Show Answer
Answer: ((a))

To calculate the short-circuit voltage of the alternator 

59

In a single-phase RL series circuit, if the current lags the supply voltage by an angle of 60°, then the voltage across the inductor leads the supply voltage by an angle of __________.

  1. ((a))

    90°

  2. ((b))

    60°

  3. ((c))

    0°

  4. ((d))

    30°

Show Answer
Answer: ((a))

90°

60

What is the main design criterion for distributors in an electrical power transmission system? 

  1. ((a))

    Length 

  2. ((b))

    Frequency 

  3. ((c))

    Current-carrying capacity 

  4. ((d))

    Voltage drop 

Show Answer
Answer: ((a))

Length 

61

Which type of electric meter is typically used for measuring energy consumption in large commercial and industrial properties with high energy needs? 

  1. ((a))

    Single-phase meters 

  2. ((b))

    Prepayment meters 

  3. ((c))

    Smart meters 

  4. ((d))

    Three-phase meters 

Show Answer
Answer: ((a))

Single-phase meters 

62

What is the purpose of outcoming feeders in a distribution substation? 

  1. ((a))

    To carry power from the substation to distribution transformers  

  2. ((b))

    To protect the substation from faults 

  3. ((c))

    To generate electrical power 

  4. ((d))

    To control the voltage of the substation 

Show Answer
Answer: ((a))

To carry power from the substation to distribution transformers  

63

Which of the following materials is rarely used as dielectric material in power cables? 

  1. ((a))

    Liquid 

  2. ((b))

    Solid 

  3. ((c))

    Compound 

  4. ((d))

    Gases 

Show Answer
Answer: ((a))

Liquid 

64

What is the primary function of the Wind Turbine Generator (WTG) in a wind power system? 

  1. ((a))

    To regulate the voltage in the electrical grid  

  2. ((b))

    To store mechanical rotational power 

  3. ((c))

    To generate usable electricity from wind energy 

  4. ((d))

    To control the speed of the wind turbine 

Show Answer
Answer: ((a))

To regulate the voltage in the electrical grid  

65

The property related to hard magnetic materials is: 

  1. ((a))

    low coercive force  

  2. ((b))

    high retentivity  

  3. ((c))

    high permeability 

  4. ((d))

    low hysteresis loss  

Show Answer
Answer: ((a))

low coercive force  

66

What is the function of the moderator in a nuclear reactor during the process of nuclear fission? 

  1. ((a))

    Cooling down the reactor core 

  2. ((b))

    Slowing down the neutrons produced by fission 

  3. ((c))

    Increasing the reaction rate 

  4. ((d))

    Spinning the turbine 

Show Answer
Answer: ((a))

Cooling down the reactor core 

67

Why is grounding important in the design of a substation? 

  1. ((a))

    To ensure room for expansion due to load growth  

  2. ((b))

    To protect passers-by during a short circuit in the transmission system 

  3. ((c))

    To protect against environmental effects 

  4. ((d))

    To facilitate access for maintenance 

Show Answer
Answer: ((a))

To ensure room for expansion due to load growth  

68

What is the difference between transmission lines and distribution lines in an electrical power system? 

  1. ((a))

    Transmission lines use single-phase systems, while distribution lines use three-phase systems. 

  2. ((b))

    Transmission lines operate at lower voltages than distribution lines. 

  3. ((c))

    Transmission lines carry electricity from generating stations to substations, while distribution lines transport power to end consumers. 

  4. ((d))

    Transmission lines have lower current carrying capacity compared to distribution lines. 

Show Answer
Answer: ((a))

Transmission lines use single-phase systems, while distribution lines use three-phase systems. 

69

What is the electrical power consumed by a circuit if a current of 4 A flows through a resistance of 5 kΩ? 

  1. ((a))

    800 W

  2. ((b))

    800 kW

  3. ((c))

    80 kW

  4. ((d))

    8000 W

Show Answer
Answer: ((a))

800 W

70

What is the result of the diffusion of electrons and holes when p-type and n-type semiconductor materials are joined to form a diode junction? 

  1. ((a))

    Formation of positive ions in the p-type material and negative ions in the n-type material 

  2. ((b))

    Creation of a layer of holes near the junction in the p-type material 

  3. ((c))

    Depletion of majority charge carriers in the region near the junction 

  4. ((d))

    Generation of an electric field that inhibits electron movement 

Show Answer
Answer: ((a))

Formation of positive ions in the p-type material and negative ions in the n-type material 

71

Which type of turbine has adjustable blades and wicket gates, allowing for a wider range of operation? 

  1. ((a))

    Straflo turbine 

  2. ((b))

    Kaplan turbine 

  3. ((c))

    Bulb turbine 

  4. ((d))

    Tube turbine

Show Answer
Answer: ((a))

Straflo turbine 

72

What type of substation is used for power factor correction, metering and control of the wind farm?

  1. ((a))

    Relay substation 

  2. ((b))

    Converter substation 

  3. ((c))

    Collector substation  

  4. ((d))

    Distribution substation 

Show Answer
Answer: ((a))

Relay substation 

73

What is the Thevenin’s voltage across the a-b terminal in the given circuit? 

  1. ((a))

    9 V

  2. ((b))

    3 V

  3. ((c))

    6 V

  4. ((d))

    15 V

Show Answer
Answer: ((a))

9 V

74

With reference to I-phase transformers, match the transformer tests in column A with the purpose of the tests in column B.

Column AColumn B
A.Short circuit testI.Wattmeter reads the core losses
B.Sumpner’s test III.Wattmeter reads the full load copper losses
C.Open circuit testIII.Determines maximum temperature rise
  1. ((a))

    A - II, B - III, C - I

  2. ((b))

    A - II, B - I, C - III

  3. ((c))

    A - I, B - II, C - III

  4. ((d))

    A - III, B - I, C - II

Show Answer
Answer: ((a))

A - II, B - III, C - I

75

What is a brownout in the context of electrical power supply? 

  1. ((a))

    A drop in the electrical power supply causing a drop in voltage 

  2. ((b))

    Protection from power surges using surge protectors and circuit breakers 

  3. ((c))

    A complete loss of power to a geographic area 

  4. ((d))

    A phenomenon that affects high power installations, leading to partial electric discharges 

Show Answer
Answer: ((a))

A drop in the electrical power supply causing a drop in voltage 

76

Find the current I2 in the following circuit. 

  1. ((a))

    1 A

  2. ((b))

    4 A

  3. ((c))

    2 A

  4. ((d))

    3 A

Show Answer
Answer: ((a))

1 A

77

What is the primary property of a dielectric material that makes it suitable for dielectric heating? 

  1. ((a))

    Ability to be polarised by an applied electric field 

  2. ((b))

    Inefficient heat dissipation 

  3. ((c))

    High electrical conductivity 

  4. ((d))

    Low electrostatic field support 

Show Answer
Answer: ((a))

Ability to be polarised by an applied electric field 

78

Which of the following is NOT an application of a synchronous motor? 

  1. ((a))

    Servo drives 

  2. ((b))

    High speed compressor  

  3. ((c))

    Main line traction 

  4. ((d))

    Dot matrix printer 

Show Answer
Answer: ((a))

Servo drives 

79

In circuit analysis, what is the term used to describe the closed path in a circuit where you start at a point and continue in the same direction, noting the direction of all voltage drops, and return to the same starting point?  

  1. ((a))

    Node

  2. ((b))

    Loop

  3. ((c))

    Path

  4. ((d))

    Branch

Show Answer
Answer: ((a))

Node

80

What is the purpose of damper winding in a synchronous motor? 

  1. ((a))

    To assist in the motor’s starting as an induction motor 

  2. ((b))

    To control the speed of the synchronous motor 

  3. ((c))

    To generate additional torque for higher efficiency 

  4. ((d))

    To provide a backup power source in case of a power outage 

Show Answer
Answer: ((a))

To assist in the motor’s starting as an induction motor 

81

Which component is responsible for generating the time scale or time reference in a Cathode Ray Oscilloscope (CRO)?

  1. ((a))

    Time-base generator 

  2. ((b))

    Delay line 

  3. ((c))

    Vertical amplifier 

  4. ((d))

    CRT 

Show Answer
Answer: ((a))

Time-base generator 

82

What is the purpose of the trigger circuit in a Cathode Ray Oscilloscope (CRO)? 

  1. ((a))

    To generate the electron beam 

  2. ((b))

    To synchronise the horizontal and vertical deflections 

  3. ((c))

    To control the power supply circuit 

  4. ((d))

    To amplify the input signal 

Show Answer
Answer: ((a))

To generate the electron beam 

83

Th the phasor diagram of an alternator, what does the angle Φ represent? 

  1. ((a))

    Synchronous reactance 

  2. ((b))

    Power factor 

  3. ((c))

    Leakage flux 

  4. ((d))

    Phase angle between voltage and current 

Show Answer
Answer: ((a))

Synchronous reactance 

84

Why are energy-efficient solutions such as LED lighting and programmable thermostats incorporated into commercial electrical installations?

  1. ((a))

    To raise operating costs 

  2. ((b))

    To increase electricity consumption 

  3. ((c))

    To reduce electricity consumption and lower operating costs 

  4. ((d))

    To improve safety measures 

Show Answer
Answer: ((a))

To raise operating costs 

85

Find the number of tums of the coil shown in the following figure, if the inductance of the coil is 1.58 μH. 

  1. ((a))

    100

  2. ((b))

    50

  3. ((c))

    78

  4. ((d))

    25

Show Answer
Answer: ((a))

100

86

Which of the following is NOT a characteristic of a radial distribution system? 

  1. ((a))

    Power flows in only one direction 

  2. ((b))

    Highly reliable 

  3. ((c))

    Low cost 

  4. ((d))

    Simple construction 

Show Answer
Answer: ((a))

Power flows in only one direction 

87

What is the unsaturated synchronous reactance (Xm) in an alternator if the armature resistance is neglected according to the following graph? 

  1. ((a))

    Xsu = Ead / Iab

  2. ((b))

    Xsu = Ead Iab

  3. ((c))

    Xsu = Ra + jZsu

  4. ((d))

    Xsu = I / (Ra + jXsu)

Show Answer
Answer: ((a))

Xsu = Ead / Iab

88

The susceptibility of the paramagnetic material is:  

  1. ((a))

    negative and small  

  2. ((b))

    positive and large 

  3. ((c))

    positive and small 

  4. ((d))

    negative and large 

Show Answer
Answer: ((a))

negative and small  

89

In the provided circuit, which of the following represents the correct Kirchhoff’s Current Law (KCL) equation for node D?

  1. ((a))

    i4 + i5 = i7

  2. ((b))

    i2 = i3 + i4

  3. ((c))

    i4 + i5 = -i7

  4. ((d))

    i3 = i5 + i6

Show Answer
Answer: ((a))

i4 + i5 = i7

90

An RLC series circuit has R =2 Ω, C = 20 μF and the inductance is adjusted such that the voltage across the resistance is maximum. If the applied voltage is 10 V at a frequency of 1000 rad/sec, then find the value of inductance L. 

  1. ((a))

    0.25 H

  2. ((b))

    0.025 H

  3. ((c))

    0.05 H

  4. ((d))

    0.005 H

Show Answer
Answer: ((a))

0.25 H

91

Find the current through 20 Ω resistance in the circuit shown in the following figure.

  1. ((a))

    4 A

  2. ((b))

    3 A

  3. ((c))

    2 A

  4. ((d))

    4.5 A

Show Answer
Answer: ((a))

4 A

92

What is the resonant frequency of an RLC circuit with the given values of resistance (R = 30 Ω), inductance (L = 1.3 mH), and capacitance (C = 30 μF)? 

  1. ((a))

    625.23 Hz

  2. ((b))

    306.63 Hz

  3. ((c))

    805.91 Hz

  4. ((d))

    100.53 Hz

Show Answer
Answer: ((a))

625.23 Hz

93

With reference to wind turbines, which of the following statements are correct?

I. In a propeller-type turbine, the number of blades is three to six.

Il. The Darrieus type of turbine is an example of vertical axis turbines.

III. Propeller type turbines are rarely used.

IV. A multi-blade type turbine is an example of horizontal axis turbines.

  1. ((a))

    II, III and IV

  2. ((b))

    I, III and IV

  3. ((c))

    I, II and IV

  4. ((d))

    I, II and III

Show Answer
Answer: ((a))

II, III and IV

94

What is the purpose of a neutral conductor in a star-connected three-phase system, and how does it help in maintaining balance? 

  1. ((a))

    The neutral conductor is used to increase the voltage between two phases, and it assists in load balancing. 

  2. ((b))

    The neutral conductor is used for grounding the system, and it helps in equalising phase voltages. 

  3. ((c))

    The neutral conductor is used for phase shifting, and it helps in generating higher voltage. 

  4. ((d))

    The neutral conductor is used for overcurrent protection, and it helps in phase separation. 

Show Answer
Answer: ((a))

The neutral conductor is used to increase the voltage between two phases, and it assists in load balancing. 

95

Which materials are classified as ferromagnetic based on their permeabilities compared to free space? 

  1. ((a))

    Materials with permeabilities the same as that of free space 

  2. ((b))

    Materials with permeabilities slightly greater than that of free space 

  3. ((c))

    Materials with permeabilities slightly less than that of free space 

  4. ((d))

    Materials with permeabilities hundreds and thousands of times greater than that of free space 

Show Answer
Answer: ((a))

Materials with permeabilities the same as that of free space 

96

The maximum load torque that can be applied to the shaft of an unexcited stepper motor, without causing continuous rotation, is called _______.

  1. ((a))

    running torque 

  2. ((b))

    pull-out torque 

  3. ((c))

    pull-in torque 

  4. ((d))

    detent torque 

Show Answer
Answer: ((a))

running torque 

97

Candela per square metre is the unit of ________.

  1. ((a))

    luminous intensity 

  2. ((b))

    luminous flux 

  3. ((c))

    illumination 

  4. ((d))

    luminance 

Show Answer
Answer: ((a))

luminous intensity 

98

How is the magnetomotive force per unit length denoted, and what is its symbol in equation form?  

  1. ((a))

    Magnetising force (H) 

  2. ((b))

    Magnetic permeability (μ) 

  3. ((c))

    Magnetic flux (Φ) 

  4. ((d))

    Magnetic density (B) 

Show Answer
Answer: ((a))

Magnetising force (H) 

99

Which of the following statements is INCORRECT for parallel resonance? 

  1. ((a))

    At resonance, the power factor will be zero. 

  2. ((b))

    At resonance, the impedance will be maximum. 

  3. ((c))

    At resonance, the line current will be in phase with the applied voltage. 

  4. ((d))

    At resonance, the current will be minimum. 

Show Answer
Answer: ((a))

At resonance, the power factor will be zero. 

100

The starting torque of a resistance-start induction motor is _____ times the full load torque.  

  1. ((a))

    4.5

  2. ((b))

    1.5

  3. ((c))

    9.5

  4. ((d))

    7.5

Show Answer
Answer: ((a))

4.5

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