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

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

In case of conductively compensated D.C. series motors, the compensating winding is provided

A) As separately wound unit B) In parallel with armature winding C) In series with armature winding D) In parallel with field winding

Discuss

Answer & Solution

Answer: Option C

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

If a D.C. motor is to be selected for conveyors, which rioter would be preferred?

A) Series motor B) Shunt motor C) Differentially compound motor D) Cumulative compound motor

Discuss

Answer & Solution

Answer: Option A

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

Torque developed by a D.C. motor depends upon

A) Magnetic field B) Active length of the conductor C) Current flow through the conductors D) All above factors

Discuss

Answer & Solution

Answer: Option D

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

The starting resistance of a D.C. motor is generally

A) Low B) Around 500 ohms C) 1000 ohms D) Infinitely large

Discuss

Answer & Solution

Answer: Option A

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

D.C. motor is to drive a load which has certain minimum value for most of the time and some peak value for short duration. We will select the

A) Series motor B) Shunt motor C) Compound motor D) Any of the above

Discuss

Answer & Solution

Answer: Option A

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

As the load is increased the speed of D.C. shunt motor will

A) Reduce slightly B) Increase slightly C) Increase proportionately D) Remains unchanged

Discuss

Answer & Solution

Answer: Option A

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

The total losses in a well designed D.C. generator of 10 kW will be nearly

A) 100 W B) 500 W C) 1000 W D) 1500 W

Discuss

Answer & Solution

Answer: Option B

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

Sparking, is discouraged in a D.C. motor because

A) It increases the input power consumption B) Commutator gets damaged C) Both (A) and (B) D) None of the above

Discuss

Answer & Solution

Answer: Option B

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

Why are the D.C. motors preferred for traction applications?

A) Torque and speed are inversely proportional to armature current B) Torque is proportional to armature current C) Torque is proportional to square root of armature current D) The speed is inversely proportional to the torque and the torque is proportional to square of armature current

Discuss

Answer & Solution

Answer: Option D

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

D.C. generators are installed near the load centers to reduce

A) Iron losses B) Line losses C) Sparking D) Corona losses

Discuss

Answer & Solution

Answer: Option B

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

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