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Electrician
Electrician Set-2
AC Three Phase Motor
59

AC Three Phase Motor MCQ with Answers

59) What is the reason for frequent blowing of fuse after motor running some time?

Improper earthing

Over loading of motor

Heavy voltage fluctuation

Poor insulation in winding

Answer is:

Poor insulation in winding

AC Three Phase Motor MCQ with Answers

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Related AC Three Phase Motor MCQ with Answers

60) What happens to a 3 phase induction motor, if one phase fails during starting?

Motor runs and stop immediately

Motor runs in slow speed continuously

Motor runs and draws more current

Motor continues to run with irregular speed

Answer is:

Motor runs and stop immediately

61) Which is the cause for the 3 phase motor starter with single phase preventer trips frequently?

Incorrect fuse ratings

Unbalanced line voltage

Incorrect settings of OLR

Improper phase sequence

Answer is:

Incorrect settings of OLR

62) What indication denotes the shorted coil defect in 3 phase motor stator winding while testing with internal growler by keeping hacksaw blade?

Hacksaw blade gets over heated

Rapid vibration of hacksaw blade

Hacksaw blade repels against the slots

Attracted by the winding turns on the slot

Answer is:

Rapid vibration of hacksaw blade

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