When the field of a synchronous motor is under-excited, the power factor will be____________?
A. leading
B. lagging
C. unity
D. zero
A. leading
B. lagging
C. unity
D. zero
A. the motor will stop
B. the motor continue to run in the same direction
C. the winding of the motor will burn
D. the motor will run in the reverse direction
E. none of the above
A. the direction of rotation is not fixed
B. the direction of instantaneous torque reverses after half cycle
C. startes cannot be used on these machines
D. starting winding is not provided on the machines
A. stop
B. run as induction motor
C. function as static condenser
D. burn with dense smoke
A. zero degree
B. two degrees
C. five degrees
D. ten degrees
A. d.c. shunt motor
B. d.c. series motor
C. d.c. compound motor
D. induction motor
E. synchronous motor
A. alternator type machines
B. induction type machines
C. salient pole type machines
D. smooth cylindrical type machines