Which D.C. motor is preferred for elevators ?

Related Mcqs:

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

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

In a D.C. series motor, if the armature current is reduced by 50%, the torque of the motor will be equal to

A. 100% of the previous value B. 50% of the previous value C. 25% of the previous value D. 10% of the previous value E. none of the above...

Three point starter can be used for______________?

A. series motor only B. shunt motor only C. compound motor only D. both shunt and compound motor...

For constant torque drive which speed control method is preferred ?

A. Field control B. Armature voltage control C. Shunt armature control D. Mechanical loading system...

During rheostat braking of D.C. series motors_____________?

A. motor is run as a generator B. motor is reversed in direction C. motor is run at reduced speed...