Which D.C. motor will be preferred for machine tools ?

Regenerative method of braking is based on that___________?

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

Which motor has the poorest speed control?

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

Flywheel is used with D.C. compound motor to reduce the peak demand by the motor, compound motor will have to be_____________?

A. level compounded
B. under compounded
C. cumulatively compounded
D. differentially compounded

Starters are used with D.C. motors because______________?

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

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

In a DC motor the inter-pole winding is connected in________________?

A. series with field winding
B. series speed armature winding
C. parallel big field winding
D. parallel with armature winding