Which of the following statements about DC motors is correct________
A. The rotor has no electromagnetic torque when the generator is running, but only when the motor is running
B. The armature has no electromotive force when the motor is running, but only when the generator is running
C. Both the generator and the motor have the same electromotive force during operation
D. Whether a generator or an electric motor, there is electromagnetic torque during operation, but the nature is different
Answer:D
Which of the following statements about DC motors is correct________
A. The rotor has no electromagnetic torque when the generator is running, but only when the motor is running B. The armature has no electromotive force when the motor is running, but only when the generator is running C. Both the generator and the motor have the same electromotive force during operation D. Whether a generator or an electric motor, there is electromagnetic torque during operation, but the nature is different