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Electrician
Electrician Set-1
Single Phase Motors
55

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

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

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

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

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

58) The rating of fuse for the protection of single phase motors should be equal to three times the

running current

starting current

no load current

full load current

Answer is:

full load current

59) As per BIS 1709:1984 recommendation, what is the ohmic value of insulation test conducted between the shorted capacitor terminal and the metal can, when measured by a 500 V megger ?

100 ohms

less than 50 kilo ohms

not less than 100 mega ohms

more than 10 mega ohms

Answer is:

not less than 100 mega ohms

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

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