The back emf of a dc motor is 108 V when it is connected to a 120 V line and reaches full speed against its normal load. What will be its back emf if a change in load causes the motor to run at half speed ?
A. 66 V
B. 12 V
C. 60 V
D. 54 V
Answer:D
The back emf of a dc motor is 108 V when it is connected to a 120 V line and reaches full speed against its normal load. What will be its back emf if a change in load causes the motor to run at half speed ?
A. 66 V B. 12 V C. 60 V D. 54 V