Buses, trains, trolleys, hoists, cranes require high starting torque and therefore make use of_____________?

Which D.C. motor has got maximum self loading property?

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

Hopkinson’s test on D.C. machines is conducted at_______________?

A. no-load
B. part load
C. full-load
D. overload

For a D.C. shunt motor if the excitation is changed_______________?

A. torque will remain constant
B. torque will change but power will remain constant
C. torque and power both will change
D. torque, power and speed, all will change

A three point starter is considered suitable for______________?

A. shunt motors
B. shunt as well as compound motors
C. shunt, compound and series motors
D. all D.C. motors

Which motor has the poorest speed control?

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

The current drawn by the armature of D.C. motor is directly proportional to__________?

A. the torque required
B. the speed of the motor
C. the voltage across the terminals
D. none of the above