practice set

SSC JE ELECTRICAL PRACTICE SET - 4

1.

The colour band at the extreme left of the colour coded resistor represents.

Answer/ Hint      

Answer : A

Explanation :

Colour coding of resistor shows the value of resistor.

                              First band – for the first digit

                              Second band – for the second digit

                              Third band – gives the no. of zeros that follow the first two digits.

                              Fourth band – gives the manufacturing tolerance.

2.

Which property of an electrical conductor opposes the flow of current through it

Answer/ Hint      

Answer : B

Explanation :

3.

Ohm is the SI unit of  _________.

Answer/ Hint      

Answer : C

Explanation :

4.

What will be the resistance (in ohms) of a resistor, when the dissipated power and the current flowing through the resistor is  12 W  and 2 A respectively 

Answer/ Hint      

Answer : D

Explanation :

5.

What will be the resistance (in ohms) of a cylindrical wire, if the length, diameter and the resistivity of the wire is  4 m, 0.2 m and 0.4 Ohms-m respectively 

Answer/ Hint      

Answer : D

Explanation :

6.

Which of the following material has the highest resistivity

Answer/ Hint      

Answer : A

Explanation :

7.

Determine the power (in W) of a lamp of  220 V, when the resistance of the lamp is  100 Ohms

Answer/ Hint      

Answer : C

Explanation :

8.

What will be the voltage (inV) of a battery connected to a parallel plate capacitor with air as dielectric, having plate area of  6 sq.  cm  and separation between the plates is  2  mm,  which stores a charge of  8.0 pC   on the plates

Answer/ Hint      

Answer : A

Explanation :

9.

What will be the value of current  ‘I’  (in A)  for the given circuit  diagram  Figure

Answer/ Hint      

Answer : B

Explanation :

10.

Find the power delivered in (in W)  by the current source in the circuit diagram given below Figure 

Answer/ Hint      

Answer : B

Explanation :

11.

The algebraic sum of all the voltage around any closed path is  _______

Answer/ Hint      

Answer : B

Explanation :

12.

Which one of the following law is based on the principle of conservation of electric charge

Answer/ Hint      

Answer : A

Explanation :

13.

The source resistance of an ideal voltage source should be  _________

Answer/ Hint      

Answer : C

Explanation :

14.

What will be the voltage (in V)  across resistor R2 in the circuit given below  Figure

Answer/ Hint      

Answer : B

Explanation :

15.

What will be the value of current (in MA)  for the given electrical circuit  Figure

Answer/ Hint      

Answer : D

Explanation :

16.

Which one of the following statement is  NOT  true about the magnetic lines of force 

Answer/ Hint      

Answer : C

Explanation :

17.

The relative permeability of paramagnetic material is  ________ .

Answer/ Hint      

Answer : D

Explanation :

18.

The  SI  unit of magnetic flux density is  _________

Answer/ Hint      

Answer : B

Explanation :

19.

Which one of the following is the formula of Intensity of magnetization 

Answer/ Hint      

Answer : B

Explanation :

20.

What will be the coefficient of self-induction (in H)  of the coil, if the current changes from  +4 A to – 4 A in 0.10-seconds and the induced  EMF is  16 V

Answer/ Hint      

Answer : C

Explanation :

21.

Calculate the intensity of magnetization (in A-m-1) in a material, if the magnetic field strength of the material is  1800 Amp-m-1 and the magnetic susceptibility is 0.4 × 10-5

Answer/ Hint      

Answer : B

Explanation :

22.

What will be the produced mmf  (in Amp-turns) in a magnetic circuit, if it has 100 number of turns and carrying a current of  0.2 A 

Answer/ Hint      

Answer : A

Explanation :

23.

What will be the flux density (in T) of a material in free space, if the field strength of the material is  2 × 105  Am- 1 and the magnetic susceptibility of the material is  0.44 × 10- 3

Answer/ Hint      

Answer : A

Explanation :

24.

Determine the value of time  (in Se)  when an average  EMF  of 100 V  is induced in a coil of area  200 cm2  with  100 turns, when  it is completely removed form a magnetic field of  30 T acting at right angles to the coil

Answer/ Hint      

Answer : C

Explanation :

25.

What is the average value of a  DC  voltage having a peak value of  25 V

Answer/ Hint      

Answer : D

Explanation :

26.

The wave from given in the figure below is an example of  ________  waveform Figure

Answer/ Hint      

Answer : D

Explanation :

27.

The inductive reactance of a circuit is  60 ohms when it is supplied with a  50 Hz supply. What will be the value of inductive reactance  (in ohms)  of the circuit, if it is supplied with  60 Hz supply

Answer/ Hint      

Answer : A

Explanation :

28.

Calculate the impedance  (in ohms)  of the series  RLC  circuit given in the figure below  Figure 

Answer/ Hint      

Answer : A

Explanation :

29.

Calculate the value of the quality factor of a series  RLC  circuit having resistance, inductance and capacitance of 30 ohms, 27 mH and 0.03 mF respectively

Answer/ Hint      

Answer : B

Explanation :

30.

What is the bandwidth (in kHz)  of a series  RLC  circuit having resistance, inductance and capacitance of 80 ohms, 2 mH and 0.01 mF respectively

Answer/ Hint      

Answer : C

Explanation :

31.

Calculate the time taken (in seconds) by the capacitor to get fully charged in a series RC  circuit having resistance and capacitance of 40 kilo-Ohms and 0.01 mF respectively

Answer/ Hint      

Answer : B

Explanation :

32.

What is the value of line voltage (in kV)  of a 3-phase star connected system having a phase voltage of  3.3 kV

Answer/ Hint      

Answer : C

Explanation :

33.

A 3-phase star connected system is supplied by a line voltage of  440 V. The value of phase current is  50 A. What is the power (in kW)  consumed by the system, if the current lags the voltage by  45 degrees

Answer/ Hint      

Answer : C

Explanation :

34.

What is the magnitude of reactive power (in kVAR)  of a balanced 3-phase delta connected system having a line voltage of  400 V  and a line current of 50 A and the phase difference between the voltage and current is  53.13 degrees 

Answer/ Hint      

Answer : C

Explanation :

35.

Which of the following is the dimension of inductance 

Answer/ Hint      

Answer : A

Explanation :

36.

Which of the following is a type of recording instrument 

Answer/ Hint      

Answer : D

Explanation :

37.

In  ‘two-wattmeter method’  of power calculation of a 3-phase balanced star connected system, what is the power factor of the system if both the watt-meters show a positive reading 

Answer/ Hint      

Answer : D

Explanation :

38.

A resistance of  75 Ohms is connected in shunt of a galvanometer, having an internal resistance of  25 ohms, to convert it into an  ammeter. What is the value of current (in A) flowing through the galvanometer, if the total current in the circuit is  5 A

Answer/ Hint      

Answer : C

Explanation :

39.

Which of the following is  TRUE  about Analog multi-meter

Answer/ Hint      

Answer : B

Explanation :

40.

The circuit given below is a circuit of  _________  bridge. Figure

Answer/ Hint      

Answer : C

Explanation :

41.

Which of the following materials when used as the viewing surface of a  CRO  gives a reddish glow

Answer/ Hint      

Answer : C

Explanation :

42.

Which of the following is  TRUE  about current transformers

Answer/ Hint      

Answer : C

Explanation :

43.

Which of the follow produces breaking torque in induction type energy meter 

Answer/ Hint      

Answer : B

Explanation :

44.

Which of the following can be used to measure frequency 

Answer/ Hint      

Answer : D

Explanation :

45.

The loss associated with the mechanical friction of a machine are called  ________

Answer/ Hint      

Answer : B

Explanation :

46.

For a 3-phase load balanced condition, each phase has the same value of  ________

Answer/ Hint      

Answer : D

Explanation :

47.

A short circuit test on a transformer gives  _________

Answer/ Hint      

Answer : B

Explanation :

48.

Armature reaction effect causes flux to reduce with  ________

Answer/ Hint      

Answer : C

Explanation :

49.

The armature of a  DC  machine is made of  ________

Answer/ Hint      

Answer : B

Explanation :

50.

DC  generators are designed to develop armature voltages not exceeding  650 V  because of the limitations of  ________

Answer/ Hint      

Answer : C

Explanation :

51.

A step up transformer increases  ________

Answer/ Hint      

Answer : B

Explanation :

52.

It is economical to transmit electricity at a  ________

Answer/ Hint      

Answer : A

Explanation :

53.

Rotating magnetic fields are also used in 3-phase induction motors rotor developing  ________

Answer/ Hint      

Answer : A

Explanation :

54.

One of the speed control methods of a 3-phase induction motors is  ________

Answer/ Hint      

Answer : A

Explanation :

55.

A centrifugal switch is provided for disconnecting the auxiliary winding in a  _________

Answer/ Hint      

Answer : A

Explanation :

56.

In a split phase motor, the running winding should have  ________

Answer/ Hint      

Answer : B

Explanation :

57.

A reluctance motor

Answer/ Hint      

Answer : D

Explanation :

58.

The speed control of a universal motor used for sewing machines is done by  ________

Answer/ Hint      

Answer : B

Explanation :

59.

The power factor of a single-phase induction motor is usually  ________

Answer/ Hint      

Answer : A

Explanation :

60.

Hysteresis motors are suitable for  ________

Answer/ Hint      

Answer : C

Explanation :

61.

A relay used on short transmission lines is  ________

Answer/ Hint      

Answer : A

Explanation :

62.

The highest voltage transmission line starting from generating point is called  ________

Answer/ Hint      

Answer : C

Explanation :

63.

A  30 km  transmission line carrying power at  33 kV is known as  ________

Answer/ Hint      

Answer : A

Explanation :

64.

The insulating material for cables should be  ________

Answer/ Hint      

Answer : D

Explanation :

65.

Name the equipment which runs an alternator.

Answer/ Hint      

Answer : C

Explanation :

66.

Electric strength in a cable is more on  ________

Answer/ Hint      

Answer : A

Explanation :

67.

In places where acids and Alkalies are present, the type of wiring used is  ________

Answer/ Hint      

Answer : B

Explanation :

68.

Replacement of wiring is not easy in which type of wiring  ________

Answer/ Hint      

Answer : C

Explanation :

69.

ACSR conductor means

Answer/ Hint      

Answer : B

Explanation :

70.

The value of supply voltage for  500 W,  5 ohm  load is  ______

Answer/ Hint      

Answer : C

Explanation :

71.

The most important factor with respect to lighting quality is

Answer/ Hint      

Answer : B

Explanation :

72.

In ACSR conductors, the insulation between aluminium and steel conductors is  ________

Answer/ Hint      

Answer : D

Explanation :

73.

Which one of the given fuse is bigger  ________

Answer/ Hint      

Answer : A

Explanation :

74.

What is the function of choke in a fluorescent lamp

Answer/ Hint      

Answer : B

Explanation :

75.

In an electric heater, the metal case is connected to  ________

Answer/ Hint      

Answer : B

Explanation :

76.

Which of the following is not an indoor lighting 

Answer/ Hint      

Answer : B

Explanation :

77.

Carbon arc lamps are commonly used in  ________

Answer/ Hint      

Answer : C

Explanation :

78.

Lumen/watt is the unit of  _______

Answer/ Hint      

Answer : D

Explanation :

79.

Arc can be produced by

Answer/ Hint      

Answer : C

Explanation :

80.

A rectifier for welding has voltage/current  characteristics as  _________

Answer/ Hint      

Answer : A

Explanation :

81.

The insulating material suitable for low temperature applications is  ________

Answer/ Hint      

Answer : A

Explanation :

82.

The method suitable for heating of conducting medium is  _________

Answer/ Hint      

Answer : A

Explanation :

83.

The number of valence electron in boron is  ________

Answer/ Hint      

Answer : C

Explanation :

84.

The potential barrier acts as a barrier against the flow of  ________

Answer/ Hint      

Answer : C

Explanation :

85.

The plate current in a triode can be controlled by controlling  ________

Answer/ Hint      

Answer : B

Explanation :

86.

A transistor consists of  ________

Answer/ Hint      

Answer : B

Explanation :

87.

The  CE  amplifier is most commonly used because of   _________

Answer/ Hint      

Answer : B

Explanation :

88.

Synchronous motor shaft is made of   ________

Answer/ Hint      

Answer : C

Explanation :

89.

A Synchronous motor has better power factor than an induction motor. This is due to  _________

Answer/ Hint      

Answer : A

Explanation :

90.

When the field circuit of an unloaded salient pole Synchronous motor gets suddenly open circuited, then  __________

Answer/ Hint      

Answer : C

Explanation :

91.

The resultant armature voltage of a Synchronous motor is equal is equal to the  __________

Answer/ Hint      

Answer : B

Explanation :

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