A 220 V D.C. generator is run at full speed without any excitation. The open circuit voltage will be_____________?

Related Mcqs:

1. The open circuit voltage of a compound generator is 250 V. At full load the terminal voltage____________?

   A. will be less than 250 V
   B. will always be 250 V
   C. may be greater or less than 250 V
   D. none of the above

2. 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

3. 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

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. In over compounded generator, full load terminal voltage is______________?

   A. almost zero
   B. less than no load terminal voltage
   C. more than no load terminal voltage
   D. equal to no-load terminal voltage

6. In a level compounded D.C. generator, full load terminal voltage is______________?

   A. negligibly low
   B. equal to no-load terminal voltage
   C. more than no-load terminal voltage
   D. less than no-load terminal voltage

7. 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

8. 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

9. If a D.C. generator fails to build up the probable cause could not be_____________?

   A. imperfect brush contact
   B. field resistance less than the critical resistance
   C. no residual magnetism in the generator
   D. faulty shunt connections tending to reduce the residual magnetism

10. 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