A. r.p.m. is more than 300
B. r.p.m. is less than 300
C. number of poles is 4
D. number of poles is 2
A. Series field
B. Compensating field
C. Inter pole field
D. Shunt field
A. interpoles
B. dummy coils
C. compensating winding
D. shifting of axis of brushes
A. Insulation failure between two commutator bars
B. Insulation failure between two turns of a coil
C. Two of more turns of the same coil getting grounded
D. All of the above
A. neutralising residual magnetism
B. creating residual magnetism by a D.C. source
C. making the magnetic losses of forces parallel
D. increasing flux density by adding extra turns of windings on poles
A. there is no load on|he generator
B. the generator runs on full load
C. the generator runs on overload
D. the generator runs on designed speed
A. speed of armature
B. type of winding
C. voltage
D. amount of current to be collected