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Synchronous Motors

Which of the following resistances can be measured by conducting insulation resistance test on a synchronous motor ?

Synchronous Motors /
Which of the following resistances can be measured by conducting insulation resistance test on a synchronous motor ?

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

Which of the following resistances can be measured by conducting insulation resistance test on a synchronous motor ? Read More »

Synchronous Motors

When a 3-phase synchronous generator is supplying a zero power factor lagging load, the armature field affects the main field in the following way

Synchronous Motors /
When a 3-phase synchronous generator is supplying a zero power factor lagging load, the armature field affects the main field in the following way

A. augments it directly
B. directly opposes it
C. cross-magnetises it
D. none of the above

When a 3-phase synchronous generator is supplying a zero power factor lagging load, the armature field affects the main field in the following way Read More »

Synchronous Motors

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

Synchronous Motors /
If in a synchronous motor, driving mechanical load and drawing current at lagging power factor from constant voltage supply, its field excitation is increased, then its power factor__________?

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

If in a synchronous motor, driving mechanical load and drawing current at lagging power factor from constant voltage supply, its field excitation is increased, then its power factor__________? Read More »

Synchronous Motors

The mechanical displacement of the rotor with respect to the stator, in polyphase multipolar synchronous motors running at full load, is of the order of_____________?

Synchronous Motors /
The mechanical displacement of the rotor with respect to the stator, in polyphase multipolar synchronous motors running at full load, is of the order of_____________?

A. zero degree
B. two degrees
C. five degrees
D. ten degrees

The mechanical displacement of the rotor with respect to the stator, in polyphase multipolar synchronous motors running at full load, is of the order of_____________? Read More »

Synchronous Motors