practice set

SSC JE ELECTRICAL PRACTICE SET - 9

1.

If an atom loses one or more electrons, it becomes  __________

Answer/ Hint      

Answer : B

Explanation :

2.

Absorbed moisture contents affect the dielectric strength  __________

Answer/ Hint      

Answer : B

Explanation :

3.

What will be the capacity of four capacitors of equal capacity  ‘C’ when connected in series

Answer/ Hint      

Answer : B

Explanation :

4.

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 :

5.

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

Answer/ Hint      

Answer : A

Explanation :

6.

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

Answer/ Hint      

Answer : A

Explanation :

7.

Efficiency is  ____________

Answer/ Hint      

Answer : C

Explanation :

8.

The internal voltage drop of a voltage source  ___________

Answer/ Hint      

Answer : C

Explanation :

9.

If a capacitor is charged by a square wave current source, the voltage across the capacitor is  __________

Answer/ Hint      

Answer : B

Explanation :

10.

Kirchhoff is voltage law applied to circuit with  __________

Answer/ Hint      

Answer : D

Explanation :

11.

Which of the following is an active element of circuit

Answer/ Hint      

Answer : D

Explanation :

12.

Static electricity is produced by  ________

Answer/ Hint      

Answer : B

Explanation :

13.

The transient currents are due to  ___________

Answer/ Hint      

Answer : D

Explanation :

14.

A coil with large distributed capacitance has  ____________

Answer/ Hint      

Answer : D

Explanation :

15.

To a highly inductive circuit a small capacitance is added in series the angle between voltage and current and current will  __________

Answer/ Hint      

Answer : B

Explanation :

16.

For a prototype low pass filter, the series and shunt elements are respectively

Answer/ Hint      

Answer : B

Explanation :

17.

For a prototype hight pass filter, the series element is  _________

Answer/ Hint      

Answer : C

Explanation :

18.

The shunt element of prototype high pass filter is  ____________

Answer/ Hint      

Answer : B

Explanation :

19.

If voltage standing wave radio, (VSWR) of a wave is 2, its reflection coefficient will be  _________

Answer/ Hint      

Answer : C

Explanation :

20.

A dominant wave is characterized by  ___________

Answer/ Hint      

Answer : C

Explanation :

21.

The standing wave ratio of a 75 Ω transmission line used to feed a 300 Ω resistive load will be  ___________

Answer/ Hint      

Answer : D

Explanation :

22.

Gauge factor of strain gauge is defined as the ratio of per unit change in the  ________

Answer/ Hint      

Answer : B

Explanation :

23.

Which one of the following is the best method of measurement of temperature of hot bodies radiating energy in visible spectrum

Answer/ Hint      

Answer : C

Explanation :

24.

The use of thermocouple meters for AC measurement leads to a meter-scale which is  __________

Answer/ Hint      

Answer : B

Explanation :

25.

Dummy strain gauge is used in conjunction with the main gain strain gauge to  _________

Answer/ Hint      

Answer : B

Explanation :

26.

Match List – 1 (transducer) with  List – 2 (characteristics)  and select the correct answer using codes given below the lists  :

     List – 1                              List – 2

P. Thermocouple     1.   Modulated output

Q. Thermistor            2. Resistance change with pressure

R.  Strain gauge           3.   Negative temperature coefficients

 S.   LVDT                           4.   Constant temperature one end

Answer/ Hint      

Answer : B

Explanation :

27.

In a flux meter, the controlling torque is  __________

Answer/ Hint      

Answer : C

Explanation :

28.

In an energy-meter which coil carries the current proportional to supply voltage  ____________

Answer/ Hint      

Answer : B

Explanation :

29.

The function of measurement system  is/are  ____________

Answer/ Hint      

Answer : D

Explanation :

30.

Moire fringes are used to measure rotary displacement along with  ___________

Answer/ Hint      

Answer : B

Explanation :

31.

In the range of an analog transducer is  0 to 10V, then for a resolution of 5mV. The bits of  ADC will be  ____________

Answer/ Hint      

Answer : D

Explanation :

32.

Which type of earthing is also called as ‘fire earthing’ 

I. Plate earthing

II. Rod earthing

III. Strip earthing

Answer/ Hint      

Answer : B

Explanation :

33.

What is the dimension of the copper strips used for the strip earthing

Answer/ Hint      

Answer : A

Explanation :

34.

What type of earthing is used by transmission lines

Answer/ Hint      

Answer : C

Explanation :

35.

What should be the value of earthing resistance for large power stations 

Answer/ Hint      

Answer : B

Explanation :

36.

What is the diameter of the  GI pipe through which the earth wire needs to be taken out

Answer/ Hint      

Answer : A

Explanation :

37.

Which set of rules are to be verified on completion of wiring on any new installation 

Answer/ Hint      

Answer : B

Explanation :

38.

Branch circuit must not feed more than  ___________  points

Answer/ Hint      

Answer : C

Explanation :

39.

The leakage current must not be more than  _________  of maximum supply current

Answer/ Hint      

Answer : C

Explanation :

40.

Which among these is a type of internal wiring

I. Cleat wiring

II.Conduit wiring

III. CTS wiring

Answer/ Hint      

Answer : D

Explanation :

41.

Which law states that induced  emf  and current always opposes producing them 

Answer/ Hint      

Answer : A

Explanation :

42.

The main purpose of using core in a transformer is to  _________

Answer/ Hint      

Answer : D

Explanation :

43.

During charging, the specific gravity of the electrolyte of a lead acid battery  __________

Answer/ Hint      

Answer : C

Explanation :

44.

The best indication about the state of charge on a lead acid battery is given by  ___________

Answer/ Hint      

Answer : A

Explanation :

45.

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

Answer/ Hint      

Answer : C

Explanation :

46.

The current transformer that is used to measure a 100 A current by 5 A ammeter is a  ___________

Answer/ Hint      

Answer : A

Explanation :

47.

In dynamometer type of wattmeter, which of the coil is spilt up into two parts 

Answer/ Hint      

Answer : B

Explanation :

48.

The series magnet of a single phase energy meter consists, coil of  ___________

Answer/ Hint      

Answer : B

Explanation :

49.

The frequency and domain are related through  _________

Answer/ Hint      

Answer : D

Explanation :

50.

The open loop control system is one in which

Answer/ Hint      

Answer : B

Explanation :

51.

As compared to a cplit phase motor, a capacitor start motor has  _____________

Answer/ Hint      

Answer : A

Explanation :

52.

What is called the electro-motive force (emf) of a voltage source 

Answer/ Hint      

Answer : B

Explanation :

53.

Which of the following theorems enables a number of voltage (or current) source to be combined directly into a single voltage (or current) source 

Answer/ Hint      

Answer : D

Explanation :

54.

To  neglect a voltage source, the terminals across the source are  ___________

Answer/ Hint      

Answer : B

Explanation :

55.

In a standard multi-meter for measuring  AC  voltage parameter of  ___________  voltage is measured 

Answer/ Hint      

Answer : D

Explanation :

56.

What  happens to current flow in a capacitive circuit when the DC voltage across the capacitor is approximately equal to the source voltage

Answer/ Hint      

Answer : B

Explanation :

57.

Which of the following devices can be used to test the windings of an induction for continuity

Answer/ Hint      

Answer : D

Explanation :

58.

Which of the following circuit condition does a metal oxide varistor (MOV) protect against 

Answer/ Hint      

Answer : A

Explanation :

59.

How should a fuse be installed in a circuit to insure proper operation

Answer/ Hint      

Answer : B

Explanation :

60.

Fermi energy level for n-type extrinsic semiconductors lies  __________

Answer/ Hint      

Answer : B

Explanation :

61.

Centrifugal Methods of reconditioning transformer oil is effective for removel of  ___________

Answer/ Hint      

Answer : A

Explanation :

62.

A generating voltmeter uses  _____________

Answer/ Hint      

Answer : A

Explanation :

63.

A servo system must have  ____________

Answer/ Hint      

Answer : D

Explanation :

64.

The major disadvantage of a feedback system many be  ___________

Answer/ Hint      

Answer : D

Explanation :

65.

What is the effect produced by the electric current in an electric motor 

Answer/ Hint      

Answer : B

Explanation :

66.

The rotating part of a  DC  motors is known as  __________

Answer/ Hint      

Answer : C

Explanation :

67.

Why is the air gap between the yoke and armature of an electric motor kept smaller

Answer/ Hint      

Answer : A

Explanation :

68.

The function of the commutator in a DC machine is  ____________

Answer/ Hint      

Answer : A

Explanation :

69.

DC shunt generator has  ___________

Answer/ Hint      

Answer : A

Explanation :

70.

Which of the following generators is used for charging batteries  

Answer/ Hint      

Answer : B

Explanation :

71.

The speed of a DC motor is  _____________

Answer/ Hint      

Answer : A

Explanation :

72.

The emf of a DC generator depends on  ___________

Answer/ Hint      

Answer : B

Explanation :

73.

In DC motor, where does iron loss occur 

Answer/ Hint      

Answer : A

Explanation :

74.

The dummy coil in DC machines is used to  _____________

Answer/ Hint      

Answer : C

Explanation :

75.

A simple method of increasing the voltage of a DC generator is __________

Answer/ Hint      

Answer : B

Explanation :

76.

The speed of a  DC  shunt motor is required to be more than  F.L (Full Load) speed. This is possible by  ___________

Answer/ Hint      

Answer : D

Explanation :

77.

An emf is induced in the windings of an armature of a DC generator when the armature rotates in  ____________

Answer/ Hint      

Answer : B

Explanation :

78.

The function of a commutator in a DC generator is  ____________

Answer/ Hint      

Answer : D

Explanation :

79.

The current flowing in the conductors of a DC motor is  __________

Answer/ Hint      

Answer : A

Explanation :

80.

As the load is increased, the speed of a dc shunt motor will  _________

Answer/ Hint      

Answer : D

Explanation :

81.

If the current in the armature of DC series motor is reduced to 5% the torque of the motor will become  _____________

Answer/ Hint      

Answer : B

Explanation :

82.

The direction of rotation of a DC shunt motor is reversed by  __________

Answer/ Hint      

Answer : A

Explanation :

83.

Which of the following is a correct statement about a series motor

Answer/ Hint      

Answer : A

Explanation :

84.

The motor that is used for intermittent, high torque load is  __________

Answer/ Hint      

Answer : D

Explanation :

85.

For which of the following DC motor, the typical field of application mentioned 

Answer/ Hint      

Answer : D

Explanation :

86.

The generator of power station produces an electric pressure by  ____________

Answer/ Hint      

Answer : D

Explanation :

87.

A DC generator can be termed as  ____________

Answer/ Hint      

Answer : A

Explanation :

88.

The parts of the armature electric circuit which take active part in  emf  generator are  ___________

Answer/ Hint      

Answer : A

Explanation :

89.

The wave form of the armature  mmf  in DC machine is  ____________

Answer/ Hint      

Answer : C

Explanation :

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