A. d.c. shunt motor
B. d.c. series motor
C. d.c. compound motor
D. induction motor
E. synchronous motor
Related Mcqs:
- An over-excited synchronous motor takes__________?
A. leading current
B. lagging current
C. both A. and (b)
D. none of the above - If in a synchronous motor, driving mechanical load and drawing current at lagging power factor from constant voltage supply, its field excitation is increased, then its power factor__________?
A. become more
B. become less
C. remain constant
D. none of the above - The armature current of the synchronous motor
A. has large values for low excitation i niy
B. has large values for high excitation only
C. has large values for low and high excitation
D. any of the above - The effect of increasing the load on a synchronous motor running with normal excitation is to___________?
A. decrease both armature current and power factor
B. decrease armature current but increase power factor
C. increase armature current but decrease power factor
D. increase both its armature current and power factor - The operating speed of a synchronous motor can be changed to new fixed value by___________?
A. changing the load
B. changing the supply voltage
C. changing frequency
D. using brakes - Under which of the following conditions hunting of synchronous motor is likely to occur?
A. Periodic variation of load
B. Over-excitation
C. Over-loading for long periods
D. Small and constant load - The percentage slip in case of a synchronous motor is____________?
A. 1%
B. 100%
C. 0.5%
D. zero - Power factor of a synchronous motor is unity when_____________?
A. the armature current is maximum
B. the armature current is minimum
C. the armature current is zero
D. none of the above - By which of the following methods the constant speed of a synchronous motor can be changed to new fixed value ?
A. By changing the supply frequency
B. By interchanging any two phases
C. By changing the applied voltage
D. By changing the load - A synchronous machine with low value of short-circuit ratio has___________?
A. lower stability limit
B. high stability limit
C. good speed regulation
D. good voltage regulation
E. none of the above
