If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be____________?

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. Following D.C. generator will be in a position to build up without any residual magnetism in the poles______________?

   A. series generator
   B. shunt generator
   C. compound generator
   D. self-excited generator

3. Which of the following D.C. generators will be in a position to build up without any residual magnetism in the poles?

   A. Series generator
   B. Shunt generator
   C. Compound generator
   D. None of the above

4. 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

5. 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

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. 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

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. In a D.C. generator in order to reduce sparking at brushes, the self-induced e.m.f. in the coil is neutralised by all of the following except______________?

   A. interpoles
   B. dummy coils
   C. compensating winding
   D. shifting of axis of brushes

10. According to Fleming’s right-hand rule for finding the direction of induced e.m.f., when middle finger points in the direction of induced e.m.f., forefinger will point in the direction of____________?

    A. motion of conductor
    B. lines of force
    C. either of the above
    D. none of the above