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

Related Mcqs:

1. 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...

2. 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...

3. 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...

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

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

5. Magnetic field in a D.C. generator is produced by_______________?

   A. electromagnets B. permanent magnets C. both A. and B. D. none of the above...

6. In a D.C. generator in case the resistance of the field winding is increased, then output voltage will____________?

   A. increase B. decrease C. remain unaffected D. fluctuate heavily...

7. 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...

8. The series field of a short-shunt D.C. generator is excited by_______________?

   A. external current B. armature current C. shunt current D. load current...

9. A series generator can self-excite:______________?

   A. only if the load current is zero B. only if the load current is not zero C. irrespective of the value of load current D. none of the above...

10. In a D.C. generator the number of mechanical degrees and electrical degrees will be the same when____________?

    A. r.p.m. is more than 300 B. r.p.m. is less than 300 C. number of poles is 4 D. number of poles is 2...