Synchronous Motors Objective Questions and Answers

22. Which of the following motors is most suited for driving a clock?

23. In synchronous machines, when the rotor speed becomes more than the synchronous speed during hunting, the damping bars develop

A. synchronous motor torque

B. dc motor torque

C. induction motor torque

D. induction generator torque

Discussion

24. When a synchronous motor delivering rated load is adjusted so that counter emf equals terminal voltage at torque angle 300, then the impedance voltage drop in armature winding as a percentage of terminal voltage is

25. The breakdown torque of a synchronous motor varies as

26. In a syncronous motor, which of the following losses do not vary with load?

27. The construction of synchronous motor is similar to

A. dc compound motor

B. slip ring induction motor

C. alternator

D. dc series motor

Discussion

28. A synchronous motor is said to be "floating" when it operates

A. on no load and without losses

B. on constantly varying load

C. on pulsating load

D. on high load and variable supply voltage

Discussion

Synchronous Motors MCQs