Synchronous Motors

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

A. more
B. less
C. equal
D. twice

A. when supply voltage fluctuates
B. when load varies
C. when power factor is unity
D. motor is under loaded

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

A. leading
B. lagging
C. unity
D. zero

A. maintaining constant excitation
B. running the motor on leading power factors
C. providing damper bars in the rotor pole faces
D. oscillations cannot be damped

A. lagging power factor only
B. leading power factor only
C. unity power factor only
D. lagging, leading and unity power factors

A. 2
B. 3
C. 4
D. 6

A. zero power factor leading
B. unity power factor
C. 0.707 power factor lagging
D. 0.707 power factor leading

A. the synchronous speed
B. less than synchronous speed
C. more than synchronous speed
D. none of the above