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Electrician Set-1
Single Phase Motors
52

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

52) An electric motor gets overheated. This may be due to

over loading

shorted stator winding

worn out bearings

low or high voltage

Answer is:

worn out bearings

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

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Related 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

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

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

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