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Electrician
Electrician Set-1
DC Motors
23

DC Motors MCQ - Electrician (Set-1) with Answers

23) Which of the following methods is most economical for finding the no-load losses of a long shunt d.c. motor ?

Hopkinson's test

Swinburne's test

Retardation test

None of these

Answer is:

Swinburne's test

DC Motors MCQ - Electrician (Set-1) with Answers

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Related DC Motors MCQ - Electrician (Set-1) with Answers

24) The rated speed of a given shunt motor is 1050 r.p.m. To run this motor at 1200 r.p.m., which of the following speed control scheme will be suitable ?

Armature current resistance control

Field resistance control

Ward-Leonard control

None of these

Answer is:

Field resistance control

25) Which of the following statement is more appropriate ?

Shunt motor is suitable for electric trains

Series motor is suitable for machine tools

Series motor is suitable for belt driven machines

Compound motor is suitable for fly-wheel drive

Answer is:

Compound motor is suitable for fly-wheel drive

26) Which of the following motors is used to drive the constant speed line-shafting lathes, blowers and fans ?

D.C. shunt motor

D.C. series motor

Cumulative compound motor

Differential compound motor

Answer is:

D.C. shunt motor

27) You notice that a d.c. motor starts with jerk when starting the motor. What may be the fault for this effect ?

Line voltage too high

Short-circuit in the field winding

Pitted starter contact terminals

Wrong grade of carbon brushes

Answer is:

Pitted starter contact terminals

DC Motors MCQ - Electrician (Set-1) with Answers

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