practice set

SSC JE ELECTRICAL PRACTICE SET - 2

1.

Which of the following material does not allow the current to flow in it

Answer/ Hint      

Answer : B

Explanation :

2.

How much power (in W)  will be dissipated by a  5 Ohm resistor in which the value of current is  2 A

Answer/ Hint      

Answer : C

Explanation :

3.

Which property of an electrical conductor opposes a change in the current

Answer/ Hint      

Answer : D

Explanation :

4.

What is the resistivity (in Ohms-m) of a  2 ohm cylindrical wire when the length and the diameter of the wire are 10 m and 0.4 m respectively

Answer/ Hint      

Answer : A

Explanation :

5.

Farad is the  S.I. unit of  ________ .

Answer/ Hint      

Answer : C

Explanation :

6.

What is the equivalent capacitance  (in μF)  for the circuit given below 

Answer/ Hint      

Answer : B

Explanation :

7.

What will be the resistance (in Ohms)  of  a lamp rated at  220 V,  200 W

Answer/ Hint      

Answer : B

Explanation :

8.

What is the equivalent resistance  (in Ohm)  for the circuit given below 

Answer/ Hint      

Answer : A

Explanation :

9.

Two  wires of same resistivity have equal length. The cross sectional area of first wire is two times to the area of the other. What will be the resistance  (in Ohms)  of the wire that has a large cross sectional area, if the resistance of the other wire is  20 ohms 

Answer/ Hint      

Answer : D

Explanation :

10.

What will be the resistance  (in Ohms) of bulb A for the circuit given below 

Answer/ Hint      

Answer : D

Explanation :

11.

Which of the following statement is  CORRECT 

Answer/ Hint      

Answer : D

Explanation :

12.

The algebraic sum of the electric currents meeting at a common point is  __________

Answer/ Hint      

Answer : A

Explanation :

13.

Which of the following law is based on the conservation of energy 

Answer/ Hint      

Answer : B

Explanation :

14.

What is the value of current  I4  (in A)  for the given junction

Answer/ Hint      

Answer : C

Explanation :

15.

What is the value of Norton resistance (in Ohm) between the terminal  A  and  B  for the given Norton’s equivalent circuit 

Answer/ Hint      

Answer : C

Explanation :

16.

Determine the value of current  (in A)  through both the resistors of the given circuit

Answer/ Hint      

Answer : B

Explanation :

17.

The SI  unit of magnetic flux  is  __________

Answer/ Hint      

Answer : D

Explanation :

18.

The relative permeability of diamagnetic materials is  _________ .

Answer/ Hint      

Answer : C

Explanation :

19.

Which of the following is the reciprocal of reluctance

Answer/ Hint      

Answer : C

Explanation :

20.

Which of the following is the CORRECT  formula for permeance

Answer/ Hint      

Answer : C

Explanation :

21.

Determine the intensity of magnetization (in A/m)  of a magnet when it has a pole strength of  60 A-m  and  a pole area of  20 sq. m

Answer/ Hint      

Answer : D

Explanation :

22.

What will be the magnitude of induced  EMF  (in V)  in a coil that has  200 square loops, each of side  5 cm  and  placed normal to a magnetic field ? The magnetic field increases at the rate of  4  Weber per  sq. meter.

Answer/ Hint      

Answer : B

Explanation :

23.

What will be the value of current (in A)  in a  40 cm  long solenoid in free space, if it has  400 turns,  2 cm of diameter and produces a magnetic field of 4 mT at its centre 

Answer/ Hint      

Answer : C

Explanation :

24.

What will be the self-inductance (in H)  of a 2 m long air-core solenoid, if the diameter of the solenoid is 25 cm and has  600 turns

Answer/ Hint      

Answer : A

Explanation :

25.

What will be the mutual inductance (in mH) between the two coils. If a current of 2 sin (100 t) passes through one of the coil, which induces a maximum  EMF  of 10V  in the second coil 

Answer/ Hint      

Answer : C

Explanation :

26.

Determines the magnitude of the  EMF  (in V)  induced between the axis of rotation and the rim of the disc, when the disc of diameter  40 cm  rotates with an angular velocity of  40  revolutions per second and placed in a magnetic field of  1 T  acting parallel to the rotation of the disc

Answer/ Hint      

Answer : C

Explanation :

27.

What is the peak value of the alternating voltage (in V)  having an average value of  180 V 

Answer/ Hint      

Answer : B

Explanation :

28.

The capacitive reactance of a circuit is  60 Ohms, when it is supplied with a  50 Hz supply. What will be the value of capacitive reactance (in Ohms) of the same circuit, if it is supplied with a 60 Hz supply

Answer/ Hint      

Answer : A

Explanation :

29.

A parallel  RLC  circuit is being supplied by a  DC  source as shown in the figure below. What is the value of current flowing through the capacitor (in A) 

Answer/ Hint      

Answer : A

Explanation :

30.

Calculate the value of phase angle (in Degrees) in a series  RC  circuit having a resistance of  50 Ohms  and a capacitive reactance of  86.6 Ohms,  when supplied with a frequency of  50 Hz

Answer/ Hint      

Answer : D

Explanation :

31.

What is the value of the total impedance (in Ohms) of a tank circuit working at resonant frequency having a capacitance of  0.01 mF and an inductance of  0.01 mH

Answer/ Hint      

Answer : D

Explanation :

32.

Calculate the time (in seconds) taken by a series  RL  circuit having inductance of  0.6 H  and resistance of  30 Ohms  to each a steady state value

Answer/ Hint      

Answer : C

Explanation :

33.

Which of the following is  NOT  correct about a star connected balanced  3-phase  circuit 

Answer/ Hint      

Answer : C

Explanation :

34.

A 3-phase delta connected system is supplied by a line voltage of  400 V. the value of phase current is  70 A. what is the power (in kW) consumed by the system, if the current lags the voltage by  60 degrees

Answer/ Hint      

Answer : B

Explanation :

35.

What is the apparent power of a  3-phase star connected system having a line voltage of  250 V  and a line current of  40 A  and the phase difference between the voltage and current is  36.87 degrees 

Answer/ Hint      

Answer : D

Explanation :

36.

Which of the following is the dimension of resistance

Answer/ Hint      

Answer : A

Explanation :

37.

A factory runs in  3  shifts of  8 hours each, in which it consumes  30 kW,  15 kW  and 25 kW  in each shift respectively. calculate the energy (in kWh) consumed by the factory per day

Answer/ Hint      

Answer : C

Explanation :

38.

In  2  wattmeter method of power Calculation of a 3-phase balanced star connected system, what is the power factor of the system if one of the wattmeter shows zero reading and the other shows a positive reading

Answer/ Hint      

Answer : C

Explanation :

39.

Which of the following is  NOT  an advantage of  PMMC  type instruments

Answer/ Hint      

Answer : D

Explanation :

40.

Which of the following quantities cannot be measured using a multi-meter

Answer/ Hint      

Answer : C

Explanation :

41.

Which of the following can measure the resistance having value below  1 Ohms  most precisely 

Answer/ Hint      

Answer : A

Explanation :

42.

Which of the following materials when used as the viewing surface of a  CRO  given a bluish glow

Answer/ Hint      

Answer : A

Explanation :

43.

What is the percentage voltage error of a potential transformer with system voltage of  11,000 V  and having turns ratio of  100, if the measured secondary side voltage is  105 V

Answer/ Hint      

Answer : C

Explanation :

44.

Which of the following is the cause of a speed error in induction type energy meter 

Answer/ Hint      

Answer : A

Explanation :

45.

A circuit having power factor of  0.8 consumes 20 W. what is the value of reactive power (in VAR) of the circuit 

Answer/ Hint      

Answer : B

Explanation :

46.

During plugging, external resistance is also introduced into a circuit to limit the flowing  _________ .

Answer/ Hint      

Answer : A

Explanation :

47.

A Transformer

Answer/ Hint      

Answer : D

Explanation :

48.

The overall power factor of an On-load transformer  ________ .

Answer/ Hint      

Answer : A

Explanation :

49.

Dynamic braking can be used for which of the following

Answer/ Hint      

Answer : D

Explanation :

50.

The parts of the armature electric circuit which take active part in emf generation are  ________

Answer/ Hint      

Answer : A

Explanation :

51.

The inter-poles in dc machines have a tapering shape in order to

Answer/ Hint      

Answer : B

Explanation :

52.

Maximum efficiency will occur, when copper loss and iron loss are

Answer/ Hint      

Answer : D

Explanation :

53.

The higher the voltage in the transmission line, the current which flow through the transmission line for a given power to be transmitted will be

Answer/ Hint      

Answer : C

Explanation :

54.

No-load test on induction motor is conducted to find which of the following losses

Answer/ Hint      

Answer : D

Explanation :

55.

If the torque of the induction motor decreases, the  _________

Answer/ Hint      

Answer : A

Explanation :

56.

Reduction in the capacitance of a capacitor-start motor results in reduced  ________.

Answer/ Hint      

Answer : C

Explanation :

57.

A single-phase induction motor with only the main winding excited would exhibit the following response at synchronous speed

Answer/ Hint      

Answer : D

Explanation :

58.

The electric motor used in portable drills is  ________ .

Answer/ Hint      

Answer : C

Explanation :

59.

In which single-phase motor, the rotor has no teeth or winding

Answer/ Hint      

Answer : C

Explanation :

60.

The range of efficiency for shaded pole motors is

Answer/ Hint      

Answer : D

Explanation :

61.

The direction of rotation of universal motor can be reversed by reversing the flow of current through  __________

Answer/ Hint      

Answer : C

Explanation :

62.

Which of the following statement is  incorrect 

Answer/ Hint      

Answer : B

Explanation :

63.

Series capacitors in transmission lines are of little use when

Answer/ Hint      

Answer : A

Explanation :

64.

Stability of a system is not affected by  ________ .

Answer/ Hint      

Answer : B

Explanation :

65.

Which of the following is not a constituent for making porcelain insulators

Answer/ Hint      

Answer : A

Explanation :

66.

Name the generating station where electrical energy is generated through steam

Answer/ Hint      

Answer : A

Explanation :

67.

In a 3-phase 4-wire cable, the cross-sectional area of neutral conductor is

Answer/ Hint      

Answer : C

Explanation :

68.

Fuse is always made up of alloys and metals having

Answer/ Hint      

Answer : C

Explanation :

69.

In case of stair case wiring which type of switch is used

Answer/ Hint      

Answer : C

Explanation :

70.

Two incandescent lamps of wattage 40W, 60W are connected in series with voltage of  230 V. which out of the two lamps will glow brighter 

Answer/ Hint      

Answer : A

Explanation :

71.

Rating of fuse wire is expressed in terms of  ________ .

Answer/ Hint      

Answer : C

Explanation :

72.

A 3-phase, 4-wire system is commonly used on  ________

Answer/ Hint      

Answer : D

Explanation :

73.

Insulator that is used in low voltage distribution lines is known as  ________

Answer/ Hint      

Answer : A

Explanation :

74.

Which of the following type of lamp gives more illumination from low wattage 

Answer/ Hint      

Answer : D

Explanation :

75.

The fuse is installed in which of the following wire

Answer/ Hint      

Answer : B

Explanation :

76.

The wave form of the armature m.m.f. in  DC  machine is  ________ .

Answer/ Hint      

Answer : C

Explanation :

77.

Light waves travel  with a velocity of  _________

Answer/ Hint      

Answer : A

Explanation :

78.

Light is produced in electric discharge lamps by  _________

Answer/ Hint      

Answer : C

Explanation :

79.

A  DC  generator can be termed as  _________

Answer/ Hint      

Answer : A

Explanation :

80.

Which of the following has the highest value of thermal conductivity

Answer/ Hint      

Answer : C

Explanation :

81.

During resistance welding heat produced at the joint is proportional to  _________

Answer/ Hint      

Answer : C

Explanation :

82.

Which of the following is tetravalent

Answer/ Hint      

Answer : C

Explanation :

83.

The acceptor type of impurity is  _________ .

Answer/ Hint      

Answer : C

Explanation :

84.

The reverse bias characteristics of a semiconductor diode is shown in

  1. Figure
  2. Figure
  3. Figure
  4. Figure

Answer/ Hint      

Answer : B

Explanation :

85.

The peak inverse voltage, in case of a bridge rectifier, for each, diode is  :  (where,  Em  =  peak value of input voltage)

Answer/ Hint      

Answer : A

Explanation :

86.

In an electronic circuit transistor is used for switching  ON  and  OFF  a relay, when the transistor switches  OFF  the relay, a higher voltage appears across the transistor. How can a transistor be protected from this voltage 

Answer/ Hint      

Answer : D

Explanation :

87.

The efficiency of the class  B  amplifier is approximately 

Answer/ Hint      

Answer : D

Explanation :

88.

The oscillations in a synchronous motor can be damped out by

Answer/ Hint      

Answer : B

Explanation :

89.

An over excited synchronous motor is used for  _________ .

Answer/ Hint      

Answer : C

Explanation :

90.

Synchronous motors are  ________ .

Answer/ Hint      

Answer : B

Explanation :

91.

The  under-excited synchronous motor takes  ________ .

Answer/ Hint      

Answer : B

Explanation :

SSC JE ELECTRICAL PRACTICE SET - 2
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