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Electrician Set-1
Single Phase Motors
53

Single Phase Motors MCQ - Electrician (Set-1) with Answers

53) If a single phase motor fails to start, but gives humming noise, this may be due to

low voltage

high voltage

shorted stator winding

blown fuses

Answer is:

shorted stator winding

Single Phase Motors MCQ - Electrician (Set-1) with Answers

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Related Single Phase Motors MCQ - Electrician (Set-1) with Answers

54) If a single phase motor fails to start, it may be due to

blown fuses

open circuit in auxiliary winding

open circuit in main winding

any of the above causes

Answer is:

any of the above causes

55) If a single phase induction motor runs at a speed lower than the rated one, the most likely defect is

improper size fuses

worn out bearings or low voltage or over load

open circuit in the winding

short circuit in the winding

Answer is:

worn out bearings or low voltage or over load

56) When a ceiling fan using a capacitor run motor is switched on, it hums but does not run when it is driven by some external means, it runs in the direction in which it was made to run. The possible cause is

open circuited capacitor

blown fuses

short circuited capacitor

any of the above

Answer is:

open circuited capacitor

57) Single phase motor whose direction of rotation can not be changed by changing the connection is a

Capacitor start and run motor

Double capacitor motor

Repulsion induction motor

Universal motor

Answer is:

Repulsion induction motor

Single Phase Motors MCQ - Electrician (Set-1) with Answers

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