practice set

SSC JE ELECTRICAL PRACTICE SET - 6

1.

Generally an electrolytic capacitor is made to provide  _________ .

Answer/ Hint      

Answer : D

Explanation :

2.

Voltage applied across a ceramic dielectric produces an electrostatic field  100 times greater than in air. The dielectric constant of the ceramic equals  _________

Answer/ Hint      

Answer : C

Explanation :

3.

Which of the following capacitors of identical rating will have the smallest dimensions

Answer/ Hint      

Answer : A

Explanation :

4.

Internal heating of capacitor is usually attributed to  _________ .

Answer/ Hint      

Answer : D

Explanation :

5.

During discharge of a battery

Answer/ Hint      

Answer : A

Explanation :

6.

Which efficiency of the battery is more 

Answer/ Hint      

Answer : B

Explanation :

7.

If three  30μF  capacitors are connected in series, the net capacitance is  _________

Answer/ Hint      

Answer : A

Explanation :

8.

For making capacitors, it is better to select a dielectric having  _________

Answer/ Hint      

Answer : A

Explanation :

9.

The materials having low retentivity are suitable for making

Answer/ Hint      

Answer : A

Explanation :

10.

In a parallel circuit operating with a source of  30 V  AC, designed to carry a total current of  6A, what happens to the protection device (fuse) when the resistance suddenly change to  2 Ω

Answer/ Hint      

Answer : D

Explanation :

11.

Which of the following determines total power in a series circuit

Answer/ Hint      

Answer : A

Explanation :

12.

What should be observed when connecting a voltmeter into a DC circuit

Answer/ Hint      

Answer : C

Explanation :

13.

A potential divider is normally connected  _________

Answer/ Hint      

Answer : A

Explanation :

14.

In a pure inductive circuit  __________

Answer/ Hint      

Answer : C

Explanation :

15.

The average power in a pure inductive circuit is  _________

Answer/ Hint      

Answer : A

Explanation :

16.

In a R-L series circuit the power factor  P.F.  is  _________

Answer/ Hint      

Answer : B

Explanation :

17.

The angle of a series  R-L-C  circuit is leading if  __________ 

Answer/ Hint      

Answer : C

Explanation :

18.

In an R-L-C  series circuit, during resonance,  the impedance will be

Answer/ Hint      

Answer : B

Explanation :

19.

Kirchhoff’s current law (KCL) is applicable only to  _________

Answer/ Hint      

Answer : C

Explanation :

20.

Flow of electrons in the circuit constitutes  __________

Answer/ Hint      

Answer : C

Explanation :

21.

The material used for the magnetic circuit where high value of flux density required is  __________

Answer/ Hint      

Answer : B

Explanation :

22.

If two resistance of  10Ω  are connected in parallel the equivalent is  ___________

Answer/ Hint      

Answer : C

Explanation :

23.

Unit of magnetic flux is

Answer/ Hint      

Answer : A

Explanation :

24.

Fleming’s hand rule is used to find  __________

Answer/ Hint      

Answer : D

Explanation :

25.

In which of the following voltage source is the movement of conductors in a magnetic field used to produce voltage

Answer/ Hint      

Answer : C

Explanation :

26.

The relative permeability of a material is  0.95. the material is  __________

Answer/ Hint      

Answer : A

Explanation :

27.

The series magnet of a single phase Energy mater consists of coil of  ___________ 

Answer/ Hint      

Answer : B

Explanation :

28.

The relative paramagnetic of paramagnetic material is  __________  ?

Answer/ Hint      

Answer : C

Explanation :

29.

Reluctance offered by the magnetic circuit depends upon  __________ 

Answer/ Hint      

Answer : D

Explanation :

30.

Magnetic recording tape is most commonly made from  ___________ 

Answer/ Hint      

Answer : C

Explanation :

31.

Moving iron meters can be used to measure  __________ 

Answer/ Hint      

Answer : A

Explanation :

32.

A network has  10 nodes and 17 branches. The number of different node pair voltage would be

Answer/ Hint      

Answer : C

Explanation :

33.

Which  one of the following is applicable to  any network linear or non-linear, active or passive, time varying or invariant as long as Kirchhoff’s laws are not violated

Answer/ Hint      

Answer : A

Explanation :

34.

In Which  one of the following, it is not desired to attain the condition of maximum power transfer 

Answer/ Hint      

Answer : D

Explanation :

35.

A current mirror can be used as an active load because

Answer/ Hint      

Answer : B

Explanation :

36.

If the capacitor of a single phase motor is short circuited, the motor will  ___________

Answer/ Hint      

Answer : B

Explanation :

37.

The speed of the rotating magnetic field in an induction motor is known as the

Answer/ Hint      

Answer : D

Explanation :

38.

Which  one of the following is essential for the reciprocity theorem to be applicable 

Answer/ Hint      

Answer : D

Explanation :

39.

When the frequency of the rotor of an induction motor is small, it can be measured by  ____________

Answer/ Hint      

Answer : B

Explanation :

40.

The value of the capacitor in a capacitor start motor controls the

Answer/ Hint      

Answer : A

Explanation :

41.

Which  one of the following is most economical method for starting single-phase motor

Answer/ Hint      

Answer : A

Explanation :

42.

Which  one of the following motors is represented by the characteristics curve shown below 

Figure

Answer/ Hint      

Answer : D

Explanation :

43.

For a 100% efficient transformer, the primary winding has 1000 turns and the secondary 100 turns. If the power input to the above transformer is  1000 watts, the power output is  __________

Answer/ Hint      

Answer : A

Explanation :

44.

What is the efficiency of transformer compared with that of electrical motors of the same power 

Answer/ Hint      

Answer : D

Explanation :

45.

In a common emitter amplifier, the un bypassed emitter provides  __________

Answer/ Hint      

Answer : C

Explanation :

46.

Which input yields natural response 

Answer/ Hint      

Answer : C

Explanation :

47.

The voltage of a circuit is measured by a voltmeter having input impedance comparable with the output impedance of the circuit thereby causing error in voltage measurement. This error may be called as  ________

Answer/ Hint      

Answer : D

Explanation :

48.

Which  one of the following options is an Active transducer

Answer/ Hint      

Answer : B

Explanation :

49.

Un-bonded strain gauges are  ________

Answer/ Hint      

Answer : A

Explanation :

50.

Dynamometer type moving coil instrument are provided with  _______

Answer/ Hint      

Answer : B

Explanation :

51.

Voltmeter is a galvanometer with  _________

Answer/ Hint      

Answer : A

Explanation :

52.

Strain gauge rosettes are used when  __________

Answer/ Hint      

Answer : B

Explanation :

53.

The dead time of an instrument refers to  ________

Answer/ Hint      

Answer : C

Explanation :

54.

One input terminal of high gain comparator circuit is grounded and a sinusoidal voltage is applied to the other input. The output comparator will be  _________

Answer/ Hint      

Answer : D

Explanation :

55.

A minimum phase system with no zeros has angle of  –2700  at gain crossover frequency. The system is

Answer/ Hint      

Answer : B

Explanation :

56.

Transfer function of a system is  G(s)  =  K/[s2 (1 + sT)]. This open loop system is  __________

Answer/ Hint      

Answer : B

Explanation :

57.

In a closed-loop system in which the output is the speed of a motor, the output rate control can be used to

Answer/ Hint      

Answer : C

Explanation :

58.

In an input signal with non-zero direct current (dc)  components is applied to a low pass  RC  network, then  DC  component in the output signal will be  ______

Answer/ Hint      

Answer : A

Explanation :

59.

A freshly painted layer may be dried electronically by  _________

Answer/ Hint      

Answer : C

Explanation :

60.

Two heaters rated at  1000W, 250 each are connected in series across a 250 V, 50 Hz ac mains. The total power drawn from the supply would be  __________  watt

Answer/ Hint      

Answer : B

Explanation :

61.

What is the maximum length of the flexible conduit in motor installation 

Answer/ Hint      

Answer : A

Explanation :

62.

Which among these fuse is very fast in operation

Answer/ Hint      

Answer : A

Explanation :

63.

What is the factor of safety used for current ratings in a power installation 

Answer/ Hint      

Answer : D

Explanation :

64.

Which among these is a method of wiring 

  1. Joint box
  2. Tee system
  3. Loop in system

Answer/ Hint      

Answer : D

Explanation :

65.

Which among these is a part distribution system 

  1. Feeders
  2. Distributors
  3. Service mains

Answer/ Hint      

Answer : D

Explanation :

66.

What is the maximum span up to which the wooden poles can be used

Answer/ Hint      

Answer : C

Explanation :

67.

For what voltage is the H-type of poles used 

Answer/ Hint      

Answer : B

Explanation :

68.

To prevent the decaying owing to snow an rain the wooden poles are protected by _________

  1. Aluminium
  2. Zinc
  3. Cement

Answer/ Hint      

Answer : D

Explanation :

69.

Steel rail poles of height 13 meters are used transmission purpose of  __________  voltage.

Answer/ Hint      

Answer : A

Explanation :

70.

The squirrel-cage winding of a single-phase motor is placed in the  __________

Answer/ Hint      

Answer : C

Explanation :

71.

NEMA standards rate motors according to  ________

Answer/ Hint      

Answer : A

Explanation :

72.

Which of the following motors is most suitable for signalling devices and timer 

Answer/ Hint      

Answer : D

Explanation :

73.

The purpose of skewing of rotor slots in induction motor is  _________

Answer/ Hint      

Answer : C

Explanation :

74.

In an induction motor if the rotor resistance is equal to stand-still reactance then the maximum torque is 

Answer/ Hint      

Answer : B

Explanation :

75.

The mmf produced by a single phase winding is  _________

Answer/ Hint      

Answer : A

Explanation :

76.

Usually wide and very sensitive speed control is require in case of

Answer/ Hint      

Answer : B

Explanation :

77.

Inter-poles are used in  ________

Answer/ Hint      

Answer : C

Explanation :

78.

For the production of induced  emf  field system of an electric machine  _________

Answer/ Hint      

Answer : B

Explanation :

79.

The number of conductors of the compensating winding in a DC machine

Answer/ Hint      

Answer : B

Explanation :

80.

Two DC machines  500 kW  each are tested by Hopkinson testing method. The power input would be

Answer/ Hint      

Answer : B

Explanation :

81.

In a DC machine, how are the commutating pole winding connected

Answer/ Hint      

Answer : C

Explanation :

82.

In motor circuit static frequency changers are used for  _________

Answer/ Hint      

Answer : D

Explanation :

83.

In case of traveling cranes, the motor preferred for boom hoist is  _________

Answer/ Hint      

Answer : A

Explanation :

84.

Light duty cranes are generally used in  __________

Answer/ Hint      

Answer : D

Explanation :

85.

15 minutes rated motors are suitable for  ________

Answer/ Hint      

Answer : A

Explanation :

86.

Free running and coasting periods are generally long in case of  __________

Answer/ Hint      

Answer : C

Explanation :

87.

Arc blow is a welding defect which is encountered in   _________

Answer/ Hint      

Answer : A

Explanation :

88.

Portion of the installed reserve kept in operable condition but not placed in service to supply the peak load is known as  _________

Answer/ Hint      

Answer : C

Explanation :

89.

The transmission lines which feed different sub-stations represent  __________

Answer/ Hint      

Answer : C

Explanation :

90.

Transmitting power at high voltage requires more  __________

Answer/ Hint      

Answer : D

Explanation :

91.

Copper conductors are generally used for transmission lines because it  ___________

Answer/ Hint      

Answer : A

Explanation :

92.

The conductors used for transmitting power must have following characteristics

Answer/ Hint      

Answer : D

Explanation :

93.

Steel poles are generally used for transmission lines because

  1. It has more mechanical strength and more life
  2. It occupies less space and give better appearance
  3. It has high cost

Which of the above provided reason/s is are correct

Answer/ Hint      

Answer : D

Explanation :

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