The function of pole shoes in the case of D.C. machine is______________?

Related Mcqs:

Copper brushes in D.C. machine are used_____________?

A. where low voltage and high currents are involved B. where high voltage and small cur-rents are involved C. in both of the above cases D. in none of the above cases...

The insulating material used between the commutator segments is normally_____________?

A. graphite B. paper C. mica D. insulating varnish...

Flashing the field of D.C. generator means:______________?

A. neutralising residual magnetism B. creating residual magnetism by a D.C. source C. making the magnetic losses of forces parallel D. increasing flux density by adding extra turns of windings on poles...

In D.C. generators, lap winding is used for______________?

A. high voltage, high current B. low voltage, high current C. high voltage, low current D. low voltage, low current...

The purpose of providing dummy coils in a generator is____________?

A. to reduce eddy current losses B. to enhance flux density C. to amplify voltage D. to provide mechanical balance for the rotor...