Which of the following methods is used for air cooling of turbo-alternators ?

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The change in flux linkages can be caused in which of the following ways ?

A. The flux is constant with respect to time and is stationary and the coil moves through it B. The coil is stationary with respect to flux and the flux varies in magnitude with respect to time C. Both the changes mentioned above occur together, i.e., the coil moves through a time varying field D. … The change in flux linkages can be caused in which of the following ways ?Read More...

In self cooled motors the cooling time constant is about ___________ than the heating time constant because cooling conditions are worse at standstill?

A. 2 to 3 times greater B. 3 to 4 times greater C. 4 to 5 times greater D. none of the above...

____________are always double layer type?

A. Closed windings B. Open windings C. Either of the above D. None of the above...

The stator of a D.C. machine comprises of_____________?

A. main poles B. interpoles C. frame D. all of the above...

The flash point of transformer oil should be higher than_______________?

A. 40°C B. 60°C C. 80°C D. 104°C...