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

1.
The condition for maximum efficiency for a D.C. generator is

A. Eddy current losses = stray losses

B. Hysteresis losses = eddy current losses

C. Copper losses = 0

D. Variable losses = constant losses

A. Run at normal speed

B. Not run

C. Run at lower speed

D. Burn due to heat produced in the field winding by eddy currents

A. Increasing the resistance in armature circuit

B. Increasing the resistance in field circuit

C. Reducing the resistance in the field circuit

D. Reducing the resistance in the armature circuit

A. Constant torque drive

B. Constant voltage drive

C. Constant current drive

D. None of the above

A. These motors have high starting torque

B. These motors are not self-starting

C. Back e.m.f. of these motors is zero initially

D. To restrict armature current as there is no back e.m.f. while starting

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