Q. 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
Answer: the motor will first stop and then run in opposite direction as series motor