A. only if the load current is zero
B. only if the load current is not zero
C. irrespective of the value of load current
D. none of the above
Related Mcqs:
- A shunt generator can self-excite:_________________?
A. only if the resistance of the field circuit is less than critical value
B. only if the resistance of the field circuit is greater than critical value
C. irrespective of the value of the resistance in the field circuit
D. none - 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 - 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 - 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 - A separately excited generator as compared to a self-excited generator_____________?
A. is amenable to better voltage control
B. is more stable
C. has exciting current independent of load current
D. has all above features - 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 - If a self excited D.C. generator after being installed, fails to build up on its first trial run, the first thing to do is to______________?
A. reverse the field connections
B. increase the field resistance
C. increase the speed of primemover
D. check armature insulation resistance - D.C. series generator is used_________________?
A. to supply traction load
B. to supply industrial load at constant voltage
C. voltage at the toad end of the feeder
D. for none of the above purpose - The series field of a short-shunt D.C. generator is excited by_______________?
A. external current
B. armature current
C. shunt current
D. load current - 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
