Category: Synchronous Motors

A. decreases with increase in its excitation
B. increases with increase in its excitation
C. remains unaffected with increase in excitation
D. any of the above

A. 1%
B. 0.5%
C. positive
D. zero

A. rotor and stator teeth
B. rotor and the stator poles of opposite polarity
C. rotor and the stator poles of the same polarity
D. none of the above

A. Phase to phase winding resistance
B. Stator winding to earthed frame
C. Rotor winding to earthed shaft
D. All of the above

A. stator frame
B. rotor shaft
C. pole faces
D. none of the above

A. stator supply is relieved of responsibility of producing magnetic field
B. mechanical load on the motor can be adjusted
C. synchronous motor runs at synchronous speed
D. synchronous motor has large air gap

A. a higher value of stability limit
B. a small value of inherent regulation
C. a higher synchronizing power which makes the machine less sensitive to load variations
D. all of the above

A. will refuse to start
B. will overheat in spots
C. will not come upto speed
D. will fail to pull into step

A. one-third
B. twice
C. thrice
D. six times
E. nine times

A. supplied with unbalanced voltage
B. under-loaded
C. over-loaded
D. none of the above