The purpose of providing dummy coils in a generator is____________?

Related Mcqs:

1. 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...

2. Two generators A and B have 6-poles each. Generator A has wave wound armature while generator B has lap wound armature. The ratio of the induced e.m.f. is generator A and B will be_______________?

   A. 2 : 3 B. 3 : 1 C. 3 : 2 D. 1 : 3...

3. Which of the following components of a D.C, generator plays vital role for providing direct current of a D.C. generator ?

   A. Dummy coils B. Commutator C. Eye bolt D. Equilizer rings...

4. The field coils of D.C. generator are usually made of_____________?

   A. mica B. copper C. cast iron D. carbon...

5. In case of a 4-pole D.C. generator provided with a two layer lap winding with sixteen coils, the pole pitch will be__________________?

   A. 4 B. 8 C. 16 D. 32...

6. The e.m.f. generated by a shunt wound D.C. generator isE. Now while pole flux remains constant, if the speed of the generator is doubled, the e.m.f. generated will be_______________?

   A. E/2 B. 2E C. slightly less than E D. E...

7. A separately excited generator as compared to a self-excited generator_____________?

   A. is amenable to better voltage control B. is more stable C. has exciting current independent of load current D. has all above features...

8. A sinusoidal voltage of 5 Hz is applied to the field of a shunt generator. The armature voltage wave will_____________?

   A. will be zero B. will be of 5 Hz C. will be of 5 xiVHz D. will be of v Hz 5...

9. The critical resistance of the D.C. generator is the resistance of_____________?

   A. field B. brushes C. armature D. load...

10. As a result of armature reaction, the reduction in the total mutual air gap flux in a D.C. generator is approximately______________?

    A. 40 percent B. 25 percent C. 10 percent D. 5 percent...