practice set

SSC JE ELECTRICAL PRACTICE SET - 8

1.

Which effect of the electric currents is utilized in a filament lamp

Answer/ Hint      

Answer : A

Explanation :

2.

Which of the following statements about electric voltage is true

Answer/ Hint      

Answer : B

Explanation :

3.

A material which is slightly repelled by a magnetic field is known as  ___________

Answer/ Hint      

Answer : A

Explanation :

4.

Internal resistance per cell of Lead Acid cell is always  __________

Answer/ Hint      

Answer : A

Explanation :

5.

Mica capacitors are characterised by all of the following except  ___________

Answer/ Hint      

Answer : C

Explanation :

6.

In a capacitor, the electric charge is stored in  ___________

Answer/ Hint      

Answer : A

Explanation :

7.

When a dielectric placed in an electric field, the field strength  __________

Answer/ Hint      

Answer : B

Explanation :

8.

The maximum value potential gradient in a cable occurs in  ___________

Answer/ Hint      

Answer : A

Explanation :

9.

A six dot mica capacitor colour coded, white, red, green, brown, red and yellow has the capacitance value of  ____________

Answer/ Hint      

Answer : D

Explanation :

10.

A charge exists on a conductor. The best way to remove this charge is to  _________

Answer/ Hint      

Answer : B

Explanation :

11.

A current of  5A  flows through a conductor against a potential difference of  200V. the power dissipated will be  _________

Answer/ Hint      

Answer : D

Explanation :

12.

Energy (in units) consumed by a heater of rating  1000 W  by operating it for a period of  2 hours  will be  __________

Answer/ Hint      

Answer : B

Explanation :

13.

Copper has less resistance than aluminium and has greater tensile strength than aluminium. To work, copper proves an excellent material as compared to aluminium. In spite of this, nowadays aluminium is extensively used in transmission and distribution of power supply because 

Answer/ Hint      

Answer : A

Explanation :

14.

The resistance  R1  and R2  are connected in parallel. The ratio of values of resistance  R1 : R2  ia  4 : 1.  The current in  R1 : R2  will be equal to  ________

Answer/ Hint      

Answer : B

Explanation :

15.

Kirchhoff’s law states that in a closed loop of a circuit  ________

Answer/ Hint      

Answer : B

Explanation :

16.

Does the electric current always produce a magnetic field

Answer/ Hint      

Answer : D

Explanation :

17.

Comparing a magnetic circuit with an electric circuit the equivalent for the magnetic flux is ___________

Answer/ Hint      

Answer : C

Explanation :

18.

In an  RC-coupled common Emitter amplifier

Answer/ Hint      

Answer : B

Explanation :

19.

The threshold voltage of an  n-channel  MOSFET  can be increased by  ___________

Answer/ Hint      

Answer : B

Explanation :

20.

The transit time of the current carriers through the channel of an  FET  decides its  __________  characteristics

Answer/ Hint      

Answer : A

Explanation :

21.

The drift velocity of elements, in silicon  ____________

Answer/ Hint      

Answer : A

Explanation :

22.

Thermal runaway in a transistor biased in the active range is due to  __________

Answer/ Hint      

Answer : D

Explanation :

23.

An external resistance added in the field of a  dc  shunt generator will  __________

Answer/ Hint      

Answer : C

Explanation :

24.

Torque of a motor is  ___________

Answer/ Hint      

Answer : B

Explanation :

25.

The terminal board of a motor is as shown in the diagram. Which type of motor is this

Answer/ Hint      

Answer : D

Explanation :

26.

The speed of a series motor at no load is  ____________

Answer/ Hint      

Answer : D

Explanation :

27.

The field flux of a dc motor cab be controlled to achieve  _____________

Answer/ Hint      

Answer : B

Explanation :

28.

What will happen if the supply terminals of dc shunt motor are interchanged

Answer/ Hint      

Answer : B

Explanation :

29.

Resistivity of a semiconductor depends on  ____________

Answer/ Hint      

Answer : A

Explanation :

30.

A germanium atom contains   __________

Answer/ Hint      

Answer : A

Explanation :

31.

A hole is the vacancy created when  ___________

Answer/ Hint      

Answer : B

Explanation :

32.

Forbidden energy gap between valence band and conduction band is least in the case of  ___________

Answer/ Hint      

Answer : D

Explanation :

33.

Donor impurity atom in a semiconductor  result in new  _____________

Answer/ Hint      

Answer : C

Explanation :

34.

A p-type semiconductor   is  ____________

Answer/ Hint      

Answer : C

Explanation :

35.

Change of carrier concentration along the length of semiconductor   is called  ___________

Answer/ Hint      

Answer : C

Explanation :

36.

In a semiconductor, movement of charge carriers under influence of an electric field is called  ____________

Answer/ Hint      

Answer : B

Explanation :

37.

In pure silicon, major part of the drift current in due to free electrons because  ___________

Answer/ Hint      

Answer : C

Explanation :

38.

Semiconductor may be made  n-type by adding donor impurity  __________

Answer/ Hint      

Answer : C

Explanation :

39.

When the plate area of a parallel plate capacitor is increased keeping the capacitor voltage constant, the force between places

Answer/ Hint      

Answer : A

Explanation :

40.

Energy stored in a capacitor over a cycle when excited by an ac source is  _________

Answer/ Hint      

Answer : C

Explanation :

41.

Inside a hollow conducting spere, electric field  ___________

Answer/ Hint      

Answer : A

Explanation :

42.

The resistance of a strip of copper of rectangular cross-section is 2 Ω A metal of resistivity twice that of copper is coated on its upper surface to a thickness equal to that of copper strip. The resistance of composite strip will be  __________

Answer/ Hint      

Answer : B

Explanation :

43.

Two coupled coils of  L = 0.8H and  L = 0.2H have a coupling coefficient k = 0.9.  The mutual inductance  M is  ___________

Answer/ Hint      

Answer : C

Explanation :

44.

A coil with large distributed capacitance has a  ___________

Answer/ Hint      

Answer : D

Explanation :

45.

A megaohm-meter reading of zero or low ohms is indicated between the stator winding and motor frame. The winding is  __________

Answer/ Hint      

Answer : C

Explanation :

46.

A capacitor motor has difficulty of starting. What is the probable cause

Answer/ Hint      

Answer : C

Explanation :

47.

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

Answer/ Hint      

Answer : B

Explanation :

48.

After the starting winding is disconnected from the circuit, the motor continues to run only on the  _______

Answer/ Hint      

Answer : B

Explanation :

49.

If the rotor of a 3-phase induction motor is assumed purely resistive, then electromagnetic torque is  _________

Answer/ Hint      

Answer : D

Explanation :

50.

The commutator in a repulsion motor provides  _____

Answer/ Hint      

Answer : A

Explanation :

51.

Which of the following motor has a squirrel-cage winding embedded in the armature under the regular winding

Answer/ Hint      

Answer : D

Explanation :

52.

A moving-iron meter will operate on  ___________

Answer/ Hint      

Answer : C

Explanation :

53.

Electro dynamometers are used extensively for the measurement of  ___________

Answer/ Hint      

Answer : D

Explanation :

54.

If a wattmeter is used in a circuit it is safe voltage or current rating is exceeded, the meter will  ___________

Answer/ Hint      

Answer : D

Explanation :

55.

A varmeter is used to indicate the  ___________

Answer/ Hint      

Answer : C

Explanation :

56.

Which of the following does a power factor meter indicate 

Answer/ Hint      

Answer : C

Explanation :

57.

What three electrical quantities can be measured by a multi-meter 

Answer/ Hint      

Answer : B

Explanation :

58.

A multi-meter uses different multipliers to increase the  __________

Answer/ Hint      

Answer : B

Explanation :

59.

When a wheat-stone bridge is balanced, the galvanometer reads

Answer/ Hint      

Answer : A

Explanation :

60.

What type of a bridge circuit is used to measure inductance and capacitance 

Answer/ Hint      

Answer : C

Explanation :

61.

A build-type voltage tester is recommended only for circuits at or number how many volts

Answer/ Hint      

Answer : A

Explanation :

62.

The amortisseur winding in a synchronous motor _____

Answer/ Hint      

Answer : B

Explanation :

63.

When a synchronous motor is started, the field winding is initially  ____________

Answer/ Hint      

Answer : A

Explanation :

64.

If the excitation and terminal voltage of synchronous motor are kept constant and the load is increased then  _____________

Answer/ Hint      

Answer : C

Explanation :

65.

In a synchronous motor  __________

Answer/ Hint      

Answer : A

Explanation :

66.

Under short circuit conditions, the power factor of an alternator is  ___________

Answer/ Hint      

Answer : A

Explanation :

67.

The rated voltage of alternators used in power stations is usually  __________

Answer/ Hint      

Answer : A

Explanation :

68.

A transformer has a core loss of 64 W and copper loss of 144 W, when it is carrying  20%  overload current. The load at which this transformer will operate at the maximum efficiency  ___________

Answer/ Hint      

Answer : A

Explanation :

69.

Two transformers operating in parallel will share the load depeanding upon their  ___________

Answer/ Hint      

Answer : B

Explanation :

70.

Which of the following transformers is smallest 

Answer/ Hint      

Answer : D

Explanation :

71.

The short-circuit test in a transformer is used to determine  ___________

Answer/ Hint      

Answer : B

Explanation :

72.

Under heavy loads, transformer efficiency is comparatively low because  ___________

Answer/ Hint      

Answer : C

Explanation :

73.

In relation to a transformer the ratio  20 : 1 indicates that  _________

Answer/ Hint      

Answer : D

Explanation :

74.

Overhead lines generally use  ___________

Answer/ Hint      

Answer : C

Explanation :

75.

High voltage transmission lines use  ____________

Answer/ Hint      

Answer : B

Explanation :

76.

The criterion for selection of size of conductor for a feeder is  ________

Answer/ Hint      

Answer : C

Explanation :

77.

The weight of a locomotive is  120  tonnes. If the axle load is not to exceed 20 tonnes, the number of axles required is  _________

Answer/ Hint      

Answer : D

Explanation :

78.

A lighting sub-circuit has 100 W lamps. If the rated current of the fused in this circuit is 5A, the maximum number of light points on this circuit without violating regulations and safety should be  _______

Answer/ Hint      

Answer : B

Explanation :

79.

What is the minimum permissible size of the earth continuity conductor

Answer/ Hint      

Answer : A

Explanation :

80.

The function of the depolarizer in a carbon zinc cell is that  __________

Answer/ Hint      

Answer : A

Explanation :

81.

Midway between two equal and similar charges, a third equal and similar charge is placed. Then this third charge will  ___________

Answer/ Hint      

Answer : A

Explanation :

82.

Two parallel conductors are carrying currents in the same direction. Which of the following statements is correct

Answer/ Hint      

Answer : C

Explanation :

83.

Is it possible to prevent by very fast operation of the switch the switching spark produce during switching off of an inductance

Answer/ Hint      

Answer : A

Explanation :

84.

A contactor coil is designed for 220V, DC. What happens if it is connected to 220V AC

Answer/ Hint      

Answer : B

Explanation :

85.

Which of the following is true about coefficient of adhesion

Answer/ Hint      

Answer : D

Explanation :

86.

Which of the following indicates the usual specific energy consumption for suburban train service

Answer/ Hint      

Answer : B

Explanation :

87.

Which of the following is the reason for the sound produced by horn in automobiles

Answer/ Hint      

Answer : B

Explanation :

88.

How is the miniature lamps on automobiles used

Answer/ Hint      

Answer : D

Explanation :

89.

For low and medium power  derives, where speed control is not required, the motor that is recommended is  _____________

Answer/ Hint      

Answer : B

Explanation :

90.

Why is the energy consumption in propelling the train required for ?

  1. Acceleration
  2. Work against gravity while moving up the gradient
  3. Work against the resistance to motion

Answer/ Hint      

Answer : C

Explanation :

91.

Which of the following is true about low frequency operation of AC series motor 

Answer/ Hint      

Answer : B

Explanation :

92.

Two locomotives having identical tractive-effort-slip characteristic haul a heavy train. The locomotive with larger diameter shares  __________

Answer/ Hint      

Answer : B

Explanation :

93.

Which of the following is the range of the efficiency of a welding motor generator 

Answer/ Hint      

Answer : B

Explanation :

94.

The  12 mm  steel plates are to be welded using arc welding. Electrode of No. 8 is to be used. What will be the current requirement

Answer/ Hint      

Answer : D

Explanation :

SSC JE ELECTRICAL PRACTICE SET - 8