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

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

If the speed of a D.C. shunt motor is increased, the back e.m.f. of the motor will

A) Increase B) Decrease C) Remain same D) Become zero

Discuss

Answer & Solution

Answer: Option A

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

In a differentially compounded D.C. motor, if shunt field suddenly opens

A) The motor will first stop and then run in opposite direction as series motor B) The motor will work as series motor and run at slow speed in the same direction C) The motor will work as series motor and run at high speed in the same direction D) The motor will not work and come to stop

Discuss

Answer & Solution

Answer: Option A

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

Speed control by Ward Leonard method gives uniform speed variation

A) In one direction B) In both directions C) Below normal speed only D) Above normal speed only

Discuss

Answer & Solution

Answer: Option B

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

For which types of D.C. motor, dynamic braking is generally used?

A) Shunt motors B) Series motors C) Compound motors D) All of the above

Discuss

Answer & Solution

Answer: Option D

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

Which D.C. motor will be suitable along with flywheel for intermittent light and heavy loads?

A) Series motor B) Shunt motor C) Cumulatively compounded motor D) Differentially compounded motor

Discuss

Answer & Solution

Answer: Option C

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

The type of D.C. motor used for shears and punches is

A) Shunt motor B) Series motor C) Differential computed D.C. motor D) Cumulative compound D.C. motor

Discuss

Answer & Solution

Answer: Option D

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

Buses, trains, trolleys, hoists, cranes require high starting torque and therefore make use of

A) D.C. series motor B) D.C. shunt motor C) Induction motor D) All of above motors

Discuss

Answer & Solution

Answer: Option A

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

The purpose of retardation test on D.C. shunt machines is to find out

A) Stray losses B) Eddy current losses C) Field copper losses D) Windage losses

Discuss

Answer & Solution

Answer: Option A

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

In a D.C. shunt motor, speed is

A) Independent of armature current B) Directly proportional to the armature current C) Proportional to the square of the current D) Inversely proportional to the armature current

Discuss

Answer & Solution

Answer: Option A

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

To get the speed of D.C, motor below the normal without wastage of electrical energy is used.

A) Ward Leonard control B) Rheostat control C) Any of the above method D) None of the above method

Discuss

Answer & Solution

Answer: Option A

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

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