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

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

46) The power factor of a squirrel cage induction motor is

Answer is:

low at light loads only

47) A 6-pole, 50 Hz, 3 phase induction motor is running at 950 R.P.M. and has rotor copper loss of 5 K.W. Its rotor input is _____ KW

Answer is:

100

48) A 6 pole, 50 Hz, 3 phase induction motor has a full load speed of 950 R.P.M. At half load, its speed would be ....... R.P.M.

Answer is:

975

49) If rotor input of a SCIM running with a slip of 10% is 100 KW, gross power developed by its rotor is _____ KW.

Answer is:

90

50) The fractional slip of an induction motor is the ratio of

Answer is:

rotor copper loss to rotor input

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