Single phase induction motors Archives - MCQ and Quiz for Exams

1. The motor used for the compressors is

d.c. series motor

shaded pole motor

capacitor-start capacitor-run motor

reluctance motor

Detailed SolutionThe motor used for the compressors is

2. The speed control of universal motor used for sewing machines is by

friction

varying the resistance

tapping the field

centrifugal mechanism

Detailed SolutionThe speed control of universal motor used for sewing machines is by

3. The running winding of a single phase motor on testing with Meggar is found to be ground. Most probable location of the ground will be

At the end connections

At the end terminals

Anywhere on the winding inside a slot

At the slot edge where coil enters or comes out of the slot

Detailed SolutionThe running winding of a single phase motor on testing with Meggar is found to be ground. Most probable location of the ground will be

4. In split-phase motor auxiliary winding is of

thick wire placed at the bottom of the slots

thick wire placed at the top of the slots

thin wire placed at the top of the slots

thin wire placed at the bottom of the slots

Detailed SolutionIn split-phase motor auxiliary winding is of

5. In a single phase motor the centrifugal switch

disconnects auxiliary winding of the motor

disconnects main winding of the motor

reconnects the main winding the motor

reconnects the auxiliary winding of the motor

Detailed SolutionIn a single phase motor the centrifugal switch

6. A repulsion motor is equipped with

slip rings

commutator

both (A) and (B)

none of the above

Detailed SolutionA repulsion motor is equipped with

7. A schrage motor can run on

zero slip

negative slip

positive slip

all of the above

Detailed SolutionA schrage motor can run on

8. The speed of a universal motor is usually reduced by using

gearing

belts

brakes

chains

Detailed SolutionThe speed of a universal motor is usually reduced by using

9. If a D.C. series motor is operated on

spark excessively

have poor efficiency

series motor is operated on A.C. supply, it will A. spark excessively B. have poor efficiency C. have poor power factor

all of the above

Detailed SolutionIf a D.C. series motor is operated on

10. Single phase induction motor usually operates on

0.6 power factor lagging

0.8 power factor lagging

0.8 power factor leading

unity power factor

Detailed SolutionSingle phase induction motor usually operates on

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