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

A. Lathe machine

B. Centrifugal pump

C. Locomotive

D. Air blower

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

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

A. Mechanical loss

B. Core loss

C. Copper loss

D. All of the above

A. Frequency of magnetic reversals

B. Maximum value of flux density

C. Volume and grade of iron

D. Rate of flow of ventilating air

A. No load

B. Part load

C. Full load

D. Overload

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

A. The field

B. The armature

C. The brushes

D. The commutator

A. Starter for a car

B. Drive for a water pump

C. Fan motor

D. Motor operation in A.C. or D.C.

A. To improve cooling

B. To reduce copper losses

C. To increase the generated e.m.f.

D. To reduce the sparking