D.C. series generator is used_________________?

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

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

5. 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...

6. The terminal voltage of a series generator is 150 V when the load current is 5 A. If the load current is increased to 10 A, the terminal voltage will be____________?

   A. 150 V B. less than 150 V C. greater than 150 V D. none of the above...

7. In a D.C. generator the ripples in the direct e.m.f. generated are reduced by_____________?

   A. using conductor of annealed copper B. using commutator with large number of segments C. using carbon brushes of superior quality D. using equiliser rings...

8. The armature core of a D.C. generator is usually made of__________________?

   A. silicon steel B. copper C. non-ferrous material D. cast-iron...

9. 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...

10. 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...