Which of the following components of a D.C, generator plays vital role for providing direct current of a D.C. generator ?

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. 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. 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

4. 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

5. 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

6. 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

7. 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

8. Which of the following generator will have negligible terminal voltage while running on no-load?

   A. Series generator
   B. Shunt generator
   C. Compound generator
   D. Separately excited generator

9. 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

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