The speed of a cumulative compound dc motor can be controlled by varying
Any of the above
The speed of a cumulative compound dc motor can be controlled by varying Armature voltage, Armature resistance and Shunt field resistance.
A dc shunt motor is driving a constant torque load with normal excitation. If the filed current is halved then the motor will run at
A dc shunt motor is driving a mechanical load at rated voltage with normal excitation. If the load torque is increased to double of the normal one, the speed of the motor will