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

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.

Answer is:

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

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

Answer is:

mechanical load

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

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.

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.

Answer is:

75

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