D.C. Motors MCQ Questions & Answers | Electrical Engineering

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Each section contains 100 MCQs on D.C. Motors .

Which of the following application requires high starting torque?

A) Lathe machine B) Centrifugal pump C) Locomotive D) Air blower

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

If the field of a D.C. shunt motor gets opened while motor is running

A) The speed of motor will be reduced % B) The armature current will reduce C) The motor will attain dangerously high speed 1 D) The motor will continue to run at constant speed

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

Which of the following steps is likely to result in reduction of hysteresis loss in a D.C. generator?

A) Providing laminations in armature core B) Providing laminations in stator C) Using nonmagnetic material for frame D) Using material of low hysteresis coefficient for armature core material

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Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

Which of the following loss in a D.C. generator is dissipated in the form of heat?

A) Mechanical loss B) Core loss C) Copper loss D) All of the above

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Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

The hysteresis loss in a D.C. machine least depends on

A) Frequency of magnetic reversals B) Maximum value of flux density C) Volume and grade of iron D) Rate of flow of ventilating air

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Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

Hopkinson's test on D.C. machines is conducted at

A) No load B) Part load C) Full load D) Overload

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Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

Regenerative method of braking is based on that

A) Back e.m.f. is less than the applied voltage B) Back e.m.f. is equal to the applied voltage C) Back e.m.f. of rotor is more than the applied voltage D) None of the above

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

In the D.C. motor the iron losses occur in

A) The field B) The armature C) The brushes D) The commutator

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

In which of the following applications D.C. series motor is invariably tried?

A) Starter for a car B) Drive for a water pump C) Fan motor D) Motor operation in A.C. or D.C.

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Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

In D.C. machines fractional pitch winding is used

A) To improve cooling B) To reduce copper losses C) To increase the generated e.m.f. D) To reduce the sparking

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

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