As the load is applied to a synchronous motor, the motor takes more armature current because
A. The increased load has to take more current
B. The rotor by shifting its phase backward causes motor to take more current
C. The back e.m.f. decreases causing an increase in motor current
D. The rotor strengthens the rotating field causing more motor current
Answer: Option B
The maximum power developed in a synchronous motor occurs at a coupling angle of
A. 30°
B. 60°
C. 90°
D. 180°
A. remains same as the original value
B. decreases to half the original value
C. tends to becomes zero
D. increases to two times the original value
The speed of a synchronous motor
A. increases as the load increases
B. decreases as the load decreases
C. always remains constant
D. none of the above
In which of the following motors the stator and rotor magnetic field rotate at the same speed ?
A. Universal motor
B. Synchronous motor
C. Induction motor
D. Reluctance motor
Join The Discussion