By which of the following methods the constant speed of a synchronous motor can be changed to new fixed value ?

Related Mcqs:

The rotor copper losses, in a synchronous motor, are met by____________?

A. d.c. source B. armature input C. motor input D. supply lines...

The back e.m.f. of a synchronous motor depends on______________?

A. speed B. load C. load angle D. all of the above...

If load (or torque) angle of a 4-pole synchronous motor is 6° electrical, its value in mechanical degrees is__________?

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

If in a synchronous motor, driving a given mechanical load and drawing current at a leading power factor from constant voltage supply its field excitation is increased, its power factor

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

Which of the following losses is not dissipated by the stator core surface in a synchronous motor?

A. Eddy current losses in the conductors B. Iron losses in the stator C. Copper losses in the slot portion of the conductors D. Windage losses E. None of the above...