Armature reaction in a generator results in_____________?

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. 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

3. 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

4. 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

5. For a D.C. generator when the number of poles and the number of armature conductors is fixed, then which winding will give the higher e.m.f___________ ?

   A. Lap winding
   B. Wave winding
   C. Either of A. and B. above
   D. Depends on other features of design

6. The armature of D.C. generator is laminated to_______________?

   A. reduce the bulk
   B. provide the bulk
   C. insulate the core
   D. reduce eddy current loss

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

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

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 number of armature parallel paths in a two-pole D.C. generator having duplex lap winding is______________?

   A. 2
   B. 4
   C. 6
   D. 8

10. 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