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

Related Mcqs:

1. 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...

2. 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...

3. 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...

4. 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...

5. In a separately excited generator supplying rated load the armature reaction.

   A. is always present B. is always absent C. may be sometimes present D. none of the above...

6. If a self excited D.C. generator after being installed, fails to build up on its first trial run, the first thing to do is to______________?

   A. reverse the field connections B. increase the field resistance C. increase the speed of primemover D. check armature insulation resistance...

7. 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...

8. The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm. If the armature current is 200 A, the terminal voltage will be_____________?

   A. 640 V B. 620 V C. 600 V D. 580 V...

9. A cumulatively compounded long shunt generator when operating as a motor would be____________?

   A. cumulatively compounded long shunt B. deferentially compounded long shunt C. cumulatively compounded short shunt D. differentially compounded short shunt...

10. The terminal voltage of a D.C. shunt generator drops on load because of all of the following reasons except:_____________?

    A. armature reaction B. armature resistance drop C. field weakening due to armature reaction and armature D. commutation...