The efficiency of a dc motor when developing maximum power will be about
Less than 50%
The efficiency of a dc motor when developing maximum power will be about Less than 50%
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