Category: Synchronous Motors

A. connected to D.C. supply
B. short-circuited by low resistance
C. kept open-circuited
D. none of the above

A. under-loaded
B. over-loaded
C. under-excited
D. over-excited

A. 1%
B. 100%
C. 0.5%
D. zero

A. Damper winding
B. Star-delta starter
C. Damper winding in conjunction with star-delta starter
D. Resistance starter in the armature circuit

A. armature current and field current
B. power factor and speed
C. field current and speed
D. field current and power factor

A. gear train arrangement
B. transmission of mechanical power by shaft
C. distribution transformer
D. turbine
E. none of the above

A. the armature current is maximum
B. the armature current is minimum
C. the armature current is zero
D. none of the above

A. will become more
B. will become less
C. will remain unchanged
D. none of the above.

A. increase in both armature current and power factor angle
B. increase in back e.m.f. but decrease in armature current
C. increase in both armature current and power factor which is lagging
D. increase in torque angle but decrease in back e.m.f.

A. more than the supply voltage
B. less than the supply voltage
C. equal to the supply voltage
D. None of these