In a differentially compounded D.C. motor, if shunt field suddenly opens
A)the motor will first stop and then run in opposite direction as series motor
B)the motor will work as series motor and run at slow speed in the same direction
C)the motor will work as series motor and run at high speed in the same direction
D)the motor will not work and come to stop

Question

Quizplus · Accepted Answer

When the shunt field suddenly opens, the motor will lose its excitation and the magnetic field will collapse. This will cause the motor to stop. However, the residual magnetism in the motor will still be present, and this will cause the motor to start running in the opposite direction as a series motor.

In a Differentially Compounded D