practice set

SSC JE ELECTRICAL PRACTICE SET - 10

1.

The S.I unit of electrical energy is  _

Answer/ Hint      

Answer : B

Explanation :

2.

Which of the following statements about the zinc-carbon cell is true 

Answer/ Hint      

Answer : D

Explanation :

3.

The capacitor, commonly used for ceiling fan motors has  a value of 2.3 μF .  The type of capacitor used is generally  _________

Answer/ Hint      

Answer : A

Explanation :

4.

Coulomb’s law for the force between electric charges closely resembles with  __________

Answer/ Hint      

Answer : D

Explanation :

5.

The potential inside a charged hollow sphere is  ___________

Answer/ Hint      

Answer : B

Explanation :

6.

A capacitor of  40 μF is charged to a potential difference of 500 volts. The charge acquired by the capacitor, in Coulomb’s, is  ___________

Answer/ Hint      

Answer : D

Explanation :

7.

Which of the following capacitors will have least energy stored in it 

Answer/ Hint      

Answer : A

Explanation :

8.

The lines of force due to charged particles are  ____________

Answer/ Hint      

Answer : B

Explanation :

9.

A capacitor can be represented by a capacitance and a resistance in parallel. For a good capacitor, this parallel resistance is  _____________

Answer/ Hint      

Answer : A

Explanation :

10.

An electric charge moves with a constant velocity(v)  parallel to the lines of force of a uniform magnetic field  B. The force experienced by the charge is  ___________

Answer/ Hint      

Answer : A

Explanation :

11.

In which of the following appliances is the heating effect used

Answer/ Hint      

Answer : C

Explanation :

12.

A voltage of 100 V is applied to a circuit of resistance of 10 Ω, the power dissipated (in watts) by the resistance will be  _____________

Answer/ Hint      

Answer : C

Explanation :

13.

Energy consumed by an electric iron of rating 1000 W as compared to  750 W will be  ______________

Answer/ Hint      

Answer : A

Explanation :

14.

The value of temperature coefficient of resistance of a given conductor  __________

Answer/ Hint      

Answer : A

Explanation :

15.

The condition in Ohm’s law is that  ____________

Answer/ Hint      

Answer : A

Explanation :

16.

Which of the following wires has the highest resistance

Answer/ Hint      

Answer : C

Explanation :

17.

A magnet is able to attract  ____________

Answer/ Hint      

Answer : D

Explanation :

18.

What is meant by magnetic saturation of iron

Answer/ Hint      

Answer : B

Explanation :

19.

A-cut off frequency of a bipolar junction transistor increases  _________

Answer/ Hint      

Answer : A

Explanation :

20.

A class-A transformer coupled, transistor power amplifier is required to deliver a power output of 10 watts. The maximum power rating of the transistor should not be less than  ____________

Answer/ Hint      

Answer : C

Explanation :

21.

A switched mode power supply operating at 20 kHz  to  100 kHz  range uses as the main switching element is  _____________

Answer/ Hint      

Answer : B

Explanation :

22.

The diffusion potential across a  p-n  junction  __________

Answer/ Hint      

Answer : D

Explanation :

23.

As compared to a full-wave rectifier using two diodes, the four diode bridge rectifier has the dominant advantage of  ____________

Answer/ Hint      

Answer : B

Explanation :

24.

In DC shunt motor, if the terminal voltage is reduced to half and torque remains the same then

Answer/ Hint      

Answer : C

Explanation :

25.

The exciting coils of any DC machine are wound  ___________

Answer/ Hint      

Answer : C

Explanation :

26.

Which of the following DC motors has the least drop in speed between no load to nominal load

Answer/ Hint      

Answer : A

Explanation :

27.

Which of the following motors is used to derive the constant speed line shafting lathes, blowers and fans 

Answer/ Hint      

Answer : A

Explanation :

28.

If the field of a DC shunt motor is opened  ____________

Answer/ Hint      

Answer : B

Explanation :

29.

When the electric train is moving down a hill the DC motor acts as  __________

Answer/ Hint      

Answer : C

Explanation :

30.

Resistivity measurements are often used determine  ___________

Answer/ Hint      

Answer : B

Explanation :

31.

In Ge, when atoms are held together by the sharing of valence electrons

Answer/ Hint      

Answer : D

Explanation :

32.

In a pure semiconductor, electric is due to  _________

Answer/ Hint      

Answer : C

Explanation :

33.

Temperature coefficient of resistance in a pure semiconductor is

Answer/ Hint      

Answer : C

Explanation :

34.

Acceptor impurity atoms in a semiconductor result in new  ____________

Answer/ Hint      

Answer : D

Explanation :

35.

An n-type semiconductor is  ____________

Answer/ Hint      

Answer : C

Explanation :

36.

When a free electron is recaptured by a hole, the process is called

Answer/ Hint      

Answer : A

Explanation :

37.

Imperfections in the crystal structure result in

Answer/ Hint      

Answer : D

Explanation :

38.

At room temperature intrinsic carrier concentration is higher in germanium than in silicon because  ______________

Answer/ Hint      

Answer : B

Explanation :

39.

Epitaxial growth is best suited for growing  _____________

Answer/ Hint      

Answer : B

Explanation :

40.

Two parallel wires separated by a distance  ‘d’ are carrying a DC current I in the same direction. The magnetic field along a line running parallel to these wires and midway between them  _________

Answer/ Hint      

Answer : B

Explanation :

41.

A water boiler of home is switched on to the ac mains supplying power at 230 V/50 Hz. The frequency of instantaneous power consumed by the boiler is 

Answer/ Hint      

Answer : C

Explanation :

42.

The energy stored in the magnetic field at a solenoid 30 cm long and 3 cm diameter wound with 1000 turns of wire carrying a current at 10 A, is  ____________

Answer/ Hint      

Answer : B

Explanation :

43.

The impulse response of an R-L circuit is a  __________

Answer/ Hint      

Answer : B

Explanation :

44.

A passive 2-port network is in a steady-state. Compared to its input, the steady state output can never offer  ________

Answer/ Hint      

Answer : C

Explanation :

45.

Which among these is a type of batten wiring

Answer/ Hint      

Answer : C

Explanation :

46.

The value of current at resonance in a series RLC circuit is affected by the value of  ___________

Answer/ Hint      

Answer : D

Explanation :

47.

A single-phase motor is made self-starting by the addition of a/an  __________

Answer/ Hint      

Answer : B

Explanation :

48.

If all the stator coils of a motor  are connected for the same magnetic polarity, there will be formed an equal number of  ____________

Answer/ Hint      

Answer : A

Explanation :

49.

Before a capacitor-start motor can reverse its direction of rotation, the

Answer/ Hint      

Answer : C

Explanation :

50.

A repulsion start induction-run motor runs as an induction motor when the

Answer/ Hint      

Answer : A

Explanation :

51.

The repulsion motor starts and runs as a _________

Answer/ Hint      

Answer : C

Explanation :

52.

Changing the electrical connections to reverse the direction of rotation of a motor running at full speed is called  ____________

Answer/ Hint      

Answer : B

Explanation :

53.

Multiplication features are incorporated in an ohmmeter to enable the meter to  ____________

Answer/ Hint      

Answer : B

Explanation :

54.

More power is required to operate a moving-iron meter than a PM-MC meter because of the magnetic circuit’s high  ___________

Answer/ Hint      

Answer : B

Explanation :

55.

A rectifier is used in an instrument for the purpose of  ___________

Answer/ Hint      

Answer : C

Explanation :

56.

What does the reading of the first dial on the right of a 4-dial watt hour meter indicate

Answer/ Hint      

Answer : A

Explanation :

57.

A demand meter is a means of indicating which of the following

Answer/ Hint      

Answer : D

Explanation :

58.

An industrial analyser is  NOT  suitable for measuring which of the following 

Answer/ Hint      

Answer : B

Explanation :

59.

A multi-meter is often called a VOM, which is an abbreviation of volt-ohm

Answer/ Hint      

Answer : C

Explanation :

60.

Which of the following is measured with a wheat stone bridge 

Answer/ Hint      

Answer : B

Explanation :

61.

What is the most simple electrical indicating instrument used on a control panel 

Answer/ Hint      

Answer : D

Explanation :

62.

Under full load running condition, the slip of a synchronous motor is

Answer/ Hint      

Answer : A

Explanation :

63.

Synchronous  motors generally have

Answer/ Hint      

Answer : B

Explanation :

64.

The  power output of a synchronous motor is  __________

Answer/ Hint      

Answer : B

Explanation :

65.

The short-circuit characteristic of an alternator is  ___________

Answer/ Hint      

Answer : A

Explanation :

66.

The ratio of armature leakage reactance to synchronous reactance of a large size modern alternator is about  ___________

Answer/ Hint      

Answer : B

Explanation :

67.

High speed alternators usually have  ____________

Answer/ Hint      

Answer : B

Explanation :

68.

Compared to the secondary of a loaded step-up transformer, the primary has

Answer/ Hint      

Answer : A

Explanation :

69.

Under operating conditions the secondary of a current transformer is always short circuited because  _____________

Answer/ Hint      

Answer : C

Explanation :

70.

During short-circuit test, the iron loss of a transformer is negligible because  ____________

Answer/ Hint      

Answer : B

Explanation :

71.

When a 400-Hz transformer is operated at 50 Hz, its kVA rating is  ____________

Answer/ Hint      

Answer : A

Explanation :

72.

The ordinary efficiency of a given transformer is maximum when

Answer/ Hint      

Answer : C

Explanation :

73.

While conducting short-circuit test on a transformer the following side is short-circuited  ___________

Answer/ Hint      

Answer : B

Explanation :

74.

In transmission lines the cross-arms are made of  ____________

Answer/ Hint      

Answer : B

Explanation :

75.

For a particular kW rating of an induction motor, the kVAR rating of these shunt capacitor required is  __________

Answer/ Hint      

Answer : B

Explanation :

76.

The main criterion for the design of a distributor is  __________

Answer/ Hint      

Answer : A

Explanation :

77.

What is the value of the magnetic vector potential due to an infinitesimally small current element, evaluated at infinite distance from it

Answer/ Hint      

Answer : C

Explanation :

78.

The minimum permissible size of the aluminium cable for lighting circuits, is

Answer/ Hint      

Answer : B

Explanation :

79.

Which of the following distribution system is used for combined power and lightning load 

Answer/ Hint      

Answer : C

Explanation :

80.

The law that induces emf and current always oppose the cause which produces it, is discovered by  ___________

Answer/ Hint      

Answer : B

Explanation :

81.

In which of the following appliance does the heating effect of current appear as an undesirable side effect 

Answer/ Hint      

Answer : C

Explanation :

 

 

82.

Upon which of the factors does the voltage drop depend 

Answer/ Hint      

Answer : D

Explanation :

83.

In a parallel circuit the potential difference across the resistance  _____________

Answer/ Hint      

Answer : D

Explanation :

84.

Two electric presses are connected in parallel. The resistance of the first press is  100Ω and that of the second is 300Ω. The total of currents taken by first : second will be equal to  ____________

Answer/ Hint      

Answer : D

Explanation :

85.

In addition to the actual running time between stops, the speed of the train that is estimated taking into account the time of stop at a station, is known as  ___________

Answer/ Hint      

Answer : B

Explanation :

86.

Which of the following statements is true

Answer/ Hint      

Answer : C

Explanation :

87.

In case of DC series motor it is possible to have finite no load speed  _________

Answer/ Hint      

Answer : B

Explanation :

88.

Why is electric braking preferred 

Answer/ Hint      

Answer : D

Explanation :

89.

If the designation of Indian Railways locomotive is known as WAM1, then in this the letter W indicates which of the following 

Answer/ Hint      

Answer : A

Explanation :

90.

What should be the minimum depth of trench from the ground level for cables carrying a voltage between 3.3 kV and 11 kV 

Answer/ Hint      

Answer : A

Explanation :

91.

The induction motors develop which of the following at low frequency of the order ½ Hz  to  10 Hz

Answer/ Hint      

Answer : B

Explanation :

92.

A rectifier for welding has voltage/current characteristic  as  __________

Answer/ Hint      

Answer : A

Explanation :

93.

What is the purpose of using Argon in Argon arc welding

Answer/ Hint      

Answer : D

Explanation :

94.

The power factor of load using welding transformer least depends on

Answer/ Hint      

Answer : D

Explanation :

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