practice set

SSC JE ELECTRICAL PRACTICE SET - 5

1.

Potential difference is measured in  __________

Answer/ Hint      

Answer : C

Explanation :

2.

Which of the following statement is  TRUE  about the resistance of a conductor 

Answer/ Hint      

Answer : D

Explanation :

3.

In series combination of resistance, the current through each resistance is  __________

Answer/ Hint      

Answer : C

Explanation :

4.

Siemens is the  S.I. unit of  __________

Answer/ Hint      

Answer : B

Explanation :

5.

Determine the conductance (in Mho) of a conductor, when the value of current that flows through the conductor is  2 A  and the potential difference between the ends of the conductor is  40 V

Answer/ Hint      

Answer : B

Explanation :

6.

What will be the value of equivalent capacitance, if three capacitors having capacitance  C  are connected in series

Answer/ Hint      

Answer : B

Explanation :

7.

Determine the resistance(in ohms) of a  14 m  long circuit wire when the diameter and the conductivity of the wire are  0.6 m and 12 mho/metre respectively

Answer/ Hint      

Answer : D

Explanation :

8.

What will be the color-coding of a resistor when the resistance of the resistor is  50 + 2% ohms 

Answer/ Hint      

Answer : B

Explanation :

9.

What will be the value of current (in A) drawn from a 4 V battery when a wire of 20 ohms resistance is stretched to double its original length and then cut into two equal parts and these equal parts are connected in parallel with the battery 

Answer/ Hint      

Answer : C

Explanation :

10.

Determine the heat dissipated (in Joule) through a conductor of 10 ohms resistance, when  1 A  of current is flowing through the conductor for  5 seconds

Answer/ Hint      

Answer : A

Explanation :

11.

Which one of the following statement is  TRUE  about Kirchhoff’s current law

Answer/ Hint      

Answer : C

Explanation :

12.

Tellegen’s theorem is based on the principle of law of  _________

Answer/ Hint      

Answer : D

Explanation :

13.

What will be the potential difference (in V) between the terminals of the resistor of  8 ohms, when the current through the resistor is  3 A

Answer/ Hint      

Answer : A

Explanation :

14.

Which one of the following expression is the expression of maximum power theorem

Answer/ Hint      

Answer : D

Explanation :

15.

Determine the value of source impedance  (in Ohms) for transmitting maximum power to the load in the circuit given below

Answer/ Hint      

Answer : B

Explanation :

16.

Determine the voltage (in V) between point A and B for the given electrical circuit 

Figure

Answer/ Hint      

Answer : B

Explanation :

17.

What will be Norton’s resistance (in ohms) between terminals A and B for the given electrical circuit 

Figure

Answer/ Hint      

Answer : C

Explanation :

18.

What will the maximum power (in W) transferred from the source to the load to the circuit given below

Figure

Answer/ Hint      

Answer : A

Explanation :

19.

Determine the total power delivered (in W) by the voltage source in the circuit given below

Figure

Answer/ Hint      

Answer : D

Explanation :

20.

What will be the value of current (in A)  through R3 resistor, if a source of 3 V  with internal resistance  3Ω is connected at  P-Q terminals with positive terminal at  P 

Figure

Answer/ Hint      

Answer : B

Explanation :

21.

Which one of the following is the  CORRECT  expression for Biot-Savart law 

Answer/ Hint      

Answer : B

Explanation :

22.

Which of the following statement is  TRUE  about the magnetic lines of force 

Answer/ Hint      

Answer : D

Explanation :

23.

Which of the following material is considered as a non-magnetic material 

Answer/ Hint      

Answer : A

Explanation :

24.

Determine the current through a coil (in A), if the coil has  140 turns and produces mmf of  14 Amp-turns

Answer/ Hint      

Answer : D

Explanation :

25.

On which of the following parameters the eddy current loss occurring in a material does not depend

Answer/ Hint      

Answer : C

Explanation :

26.

Determine the flux (in Wb) through a coil when the reluctance of the coil is  4 Amp-turns/Wb and the produced mmf is  48 Amp-turns

Answer/ Hint      

Answer : B

Explanation :

27.

Determine the magnetic field strength (in A/m) of a material when the intensity of magnetization of the material is  0.084 Amp/m and the magnetic susceptibility of the material is  0.0012

Answer/ Hint      

Answer : A

Explanation :

28.

Determine the coupling factor between two coils each having self-inductance of  40 mH and the mutual inductance between them is  40 mH

Answer/ Hint      

Answer : C

Explanation :

29.

Determine the eddy current loss (in W)  in a material having eddy current coefficient of  1, thickness of  0.03 m  and volume of  2 cubic metre which is kept in a magnetic field of maximum flux density of  3 T  and supplied by a frequency of  50 Hz

Answer/ Hint      

Answer : D

Explanation :

30.

Determine the magnitude of magnetic field  (in mT)  at the centre of a  50  cm  long solenoid, if the solenoid has  300 turns  and  carrying a current of  5 A

Answer/ Hint      

Answer : D

Explanation :

31.

What is the total impedance (in Ohms) of the series  RLC  circuit containing resistance of 8 Ohms,  capacitive reactance of  2 Ohms and inductive reactance of  8 Ohms connected in series  across a  100 V,  50 Hz  supply 

Answer/ Hint      

Answer : A

Explanation :

32.

What is the rms value of the alternating voltage (in V)  having a peak value of  1000 V 

Answer/ Hint      

Answer : D

Explanation :

33.

Calculate the quality factor of the resonant series  RLC circuit, if its bandwidth is  30 Hz

Answer/ Hint      

Answer : A

Explanation :

34.

The line current for a balanced delta connected system is 10 A. calculate the value of phase current (in A)

Answer/ Hint      

Answer : C

Explanation :

35.

For the circuit shown below, the voltage (in V) across  4mF capacitor is  _________ 

Figure

Answer/ Hint      

Answer : B

Explanation :

36.

The maximum voltage induced in the coil is 200 V and the rotation angle of the coil is  45 degrees with respect to the coil. Find the instantaneous value of the sinusoidal waveform produced

Answer/ Hint      

Answer : A

Explanation :

37.

For a pure sinusoidal waveform the form factor and crest factor are  _________  and  _________  respectively

Answer/ Hint      

Answer : B

Explanation :

38.

A sinusoidal voltage applied across a series  R-C  circuit is given by  40 sinV. The current flowing in the circuit is  20 sin()A. determine the value of average power (in W)

Answer/ Hint      

Answer : A

Explanation :

39.

A constant voltage of  60 V  is applied at  t = 0  across a series  R-L circuit as shown in the figure. Determine the current (in A) in the circuit at  t = 0 +

Figure

Answer/ Hint      

Answer : C

Explanation :

40.

Determine the value of inductor (in mH) connected in parallel with a capacitance of 5 F having a quality factor 6.  Assume the resonant frequency of  5 rad/s

Answer/ Hint      

Answer : A

Explanation :

41.

Wien’s bridge is used to measure  _________

Answer/ Hint      

Answer : D

Explanation :

42.

Ammeter and voltmeter are connected across the load in  _________  and  _________  respectively

Answer/ Hint      

Answer : A

Explanation :

43.

The deflection sensitivity of the  CRO  is  10 m/V. what is the value of deflection factor  (in V/m) 

Answer/ Hint      

Answer : B

Explanation :

44.

The current required for full scale deflection of a voltmeter is  10 mA. Find the sensitivity (in ohms/V) of the voltmeter

Answer/ Hint      

Answer : A

Explanation :

45.

Calculate the fastest rise time (in ms) a sine wave can have to be reproduced by a  CRO, if the bandwidth ranges from  0 Hz to 10 Hz

Answer/ Hint      

Answer : C

Explanation :

46.

Which of the following is  NOT  the correct representation of the balanced condition of  AC  bridges

Answer/ Hint      

Answer : B

Explanation :

47.

A 10 mA meter having an internal resistance of  100 ohms  is to be converted to 0-200 mA ammeter. What value of shunt resistance (in ohms) is required 

Answer/ Hint      

Answer : A

Explanation :

48.

A  3-phase – 110 V motor has a power  factor of  0.5.  The two watt-meters connected measure the total input of 50 kW. Calculate the reading (in kW)  of each watt-meter

Answer/ Hint      

Answer : C

Explanation :

49.

The inductance of a moving iron instrument is  (10 +6θ) μH, where  θ  is the deflection in radian from zero position. Assuming spring constant  k  =  10 × 10- 6 Nm/rad,  the deflection (in rad) for a current of  6 A is  _________

Answer/ Hint      

Answer : A

Explanation :

50.

What will happen to the operating torque of moving iron instrument, if current through the operating coil is halved

Answer/ Hint      

Answer : D

Explanation :

51.

Which of the following generators are used in arc welding

Answer/ Hint      

Answer : D

Explanation :

52.

Calculate the force experienced by the conductor, with  L = 0.5 m  and  B  =  4 Wb/m2,  when the armature current  is  5 Amp

Answer/ Hint      

Answer : B

Explanation :

53.

Maximum power will be developed when back emf is

Answer/ Hint      

Answer : B

Explanation :

54.

No load saturation characteristics are plotted between

Answer/ Hint      

Answer : A

Explanation :

55.

Transformer oil is used as

Answer/ Hint      

Answer : C

Explanation :

56.

Which is to be short circuited on performing short circuit test on a transformer

Answer/ Hint      

Answer : A

Explanation :

57.

A single phase  50 Hz transformer has high voltage and low voltage windings of  2200/220  V.  What is the Transformation ratio 

Answer/ Hint      

Answer : B

Explanation :

58.

If the air gap in an induction motor is increased   __________

Answer/ Hint      

Answer : B

Explanation :

59.

In three phase induction motor reversing the supply in two of the phases is called as  _________

Answer/ Hint      

Answer : B

Explanation :

60.

The drive motor used in a mixer-grinder is a

Answer/ Hint      

Answer : D

Explanation :

61.

The capacitors used in single-phase capacitor motors have no

Answer/ Hint      

Answer : C

Explanation :

62.

How will the total capacitance change, when two capacitors are connected in parallel 

Answer/ Hint      

Answer : A

Explanation :

63.

A universal motor can run on

Answer/ Hint      

Answer : C

Explanation :

64.

In high voltage transmission lines, the topmost conductor is

Answer/ Hint      

Answer : D

Explanation :

65.

Different types of line supports used for transmission lines include

Answer/ Hint      

Answer : D

Explanation :

66.

Two condensers of capacity  2F  and  3F  are connected in series, a third condenser of  1F  is connected in parallel to them, the resultant capacity in  Farad (F)  will be  _________

Answer/ Hint      

Answer : D

Explanation :

67.

The conductivity of aluminium as compared to copper is

Answer/ Hint      

Answer : C

Explanation :

68.

What is the type of insulator used for holding the  HT overhead conductor on straight running of poles 

Answer/ Hint      

Answer : A

Explanation :

69.

The type of lamps having highest illumination efficiency is

Answer/ Hint      

Answer : C

Explanation :

70.

At what level of current flow during electric shock death is possible

Answer/ Hint      

Answer : B

Explanation :

71.

Material used for making small rating fuses is

Answer/ Hint      

Answer : D

Explanation :

72.

In the circuit breaker, the arcing contacts are made of

Answer/ Hint      

Answer : B

Explanation :

73.

The main consideration in designing Distributor is

Answer/ Hint      

Answer : C

Explanation :

74.

When in dry condition human body resistance is around

Answer/ Hint      

Answer : A

Explanation :

75.

The electric flux and field intensity inside a conducting sphere is  _________

Answer/ Hint      

Answer : A

Explanation :

76.

Enclosure of motor is made from

Answer/ Hint      

Answer : C

Explanation :

77.

The unit of plain angle is

Answer/ Hint      

Answer : A

Explanation :

78.

The air delivery of fan is indicated by

Answer/ Hint      

Answer : D

Explanation :

79.

Which of the following will need the highest level of illumination 

Answer/ Hint      

Answer : A

Explanation :

80.

The source of illumination for a cinema projector is  __________ .

Answer/ Hint      

Answer : D

Explanation :

81.

Which of the following motor is suitable for driving cranes, hoists, centrifugal pumps, conveyor belt etc

Answer/ Hint      

Answer : A

Explanation :

82.

The main application of indirect arc furnace is to melt

Answer/ Hint      

Answer : C

Explanation :

83.

The germanium crystal behaves as an insulator at

Answer/ Hint      

Answer : A

Explanation :

84.

In p-n junction with no external voltage, the electric field between the acceptor and the donor ions is called a 

Answer/ Hint      

Answer : A

Explanation :

85.

The common emitter transistor circuit has

Answer/ Hint      

Answer : A

Explanation :

86.

The circuit that provides the best stabilisation of operating point is

Answer/ Hint      

Answer : B

Explanation :

87.

In an amplifier the maximum power transfer to the load resistance should be

Answer/ Hint      

Answer : C

Explanation :

88.

In a synchronous motor the rotor copper losses, are met by

Answer/ Hint      

Answer : B

Explanation :

89.

The change of  D.C. excitation of a synchronous motor changes

Answer/ Hint      

Answer : C

Explanation :

90.

The advantage of stationary armature of a synchronous machine is

Answer/ Hint      

Answer : D

Explanation :

91.

In which of the following motors the stator and rotor fields rotate simultaneously

Answer/ Hint      

Answer : D

Explanation :

92.

In a 3-phase synchronous motor, , if the direction of its field current is reversed

Answer/ Hint      

Answer : D

Explanation :

93.

The back e.m.f. of a synchronous motor depends on

Answer/ Hint      

Answer : C

Explanation :

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