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

A. field flux only

B. armature current only

C. both (A) and (B)

D. none of the above

A. The motor will stop

B. The motor will continue to run

C. The armature may burn

D. The motor will run noisy

A. This will make armature to take heavy current, possibly burning it

B. This will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses

C. Nothing will happen to motor

D. Motor will come to stop

A. Nothing will happen to the motor

B. This will make armature to take heavy current, possibly burning it

C. This will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses

D. Motor will run at very slow speed

A. High initial cost

B. High maintenance cost

C. Low efficiency at high loads

D. All of the above

A. Where load is constant

B. Where load changes frequently

C. Where constant operating speed is needed

D. In none of the above situations

A. Low cost

B. Wide speed range

C. Stability

D. High starting torque

A. Series motor only

B. Shunt motor only

C. Compound motor only

D. Both shunt and compound motor

A. Pumping sets

B. Air compressors

C. Electric traction

D. Machine shops

A. The speed will increase abruptly

B. The speed will increase in proportion to reduction in load

C. The speed will remain almost/constant

D. The speed will reduce