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Electrician Set-1
Polyphase Induction Motors
51

Polyphase Induction Motors MCQ - Electrician (Set-1) with Answers

51) The torque developed by a 3-phase induction motor depends on the following three factors.

speeds, frequency, number of poles

voltage, current and stator impedance

synchronous speed, rotor speed and frequency

rotor e.m.f., rotor current and rotor power factor

Answer is:

rotor e.m.f., rotor current and rotor power factor

Polyphase Induction Motors MCQ - Electrician (Set-1) with Answers

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Related Polyphase Induction Motors MCQ - Electrician (Set-1) with Answers

52) The efficiency and power factor of a SCIM increases in proportion to its

speed

mechanical load

voltage

rotor torque

Answer is:

mechanical load

53) If the stator voltage and frequency of an induction motor are reduced proportionality, its

locked rotor current is reduced

torque developed is increased

magnetising current is decreased

both 1) locked rotor current is reduced and 2) torque developed is increased

Answer is:

both 1) locked rotor current is reduced and 2) torque developed is increased

54) An induction motor has a shaft circuit current 7 times the full load current and a full load slip of 4 percent. Its line starting is _____ times the full load torque.

7

1.96

4

49

Answer is:

1.96

55) If stator voltage of a SCIM is reduced to 50 percent of its rated value, torque developed is reduced by _____ percent of its full load value.

50

25

75

57.7

Answer is:

75

Polyphase Induction Motors MCQ - Electrician (Set-1) with Answers

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