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

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The length cf air gap to be provided in __________ is primarily determined by power factor consideration?

A. d.c. series motor . B. d.c. shunt motor C. induction motor D. synchronous motor...

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

A. One sided axial ventilation B. Two sided axial ventilation C. Multiple inlet system D. All of the above...

On which of the following variables heat convected depends ?

A. Power density B. Temperature difference between heated surface and coolant C. Thermal resistivity, density, specific heat D. Gravitational constant E. All of the above...

In D.C. machines the width of the duct is usually_____________?

A. 4 mm B. 6 mm C. 8 mm D. 10 mm...

Helical windings are used in________________?

A. distribution transformers B. power transformers C. shell type transformers D. none of the above...