In a D.C. generator in case the resistance of the field winding is increased, then output voltage will____________?

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. 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

3. 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

4. Two D.C. shunt generators, each with armature resistance of 0.02 ohm and field resistance of 50 ohm run in parallel and supply a total current of 1000 amperes to the load circuit. If their e.m.fs. are 270 V and 265 V, their bus bar voltage will be_____________________?

   A. 270 V
   B. 267.5 V
   C. 265 V
   D. 257.4 V

5. In case of a 4-pole D.C. generator provided with a two layer lap winding with sixteen coils, the pole pitch will be__________________?

   A. 4
   B. 8
   C. 16
   D. 32

6. 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

7. In a D.C. generator the critical resistance refers to the resistance of_____________?

   A. brushes
   B. field
   C. armature
   D. load

8. The critical resistance of the D.C. generator is the resistance of_____________?

   A. field
   B. brushes
   C. armature
   D. load

9. In a D.C. generator the critical resistance can be increased by_____________?

   A. increasing its field resistance
   B. decreasing its field resistance
   C. increasing its speed
   D. decreasing its speed

10. 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