For both lap and wave windings, there are as many commutator bars as the number of_____________?

A. Slots
B. Armature conductors
C. Winding elements
D. Poles

The number of armature parallel paths in a two-pole D.C. generator having duplex lap winding is______________?

A. 2
B. 4
C. 6
D. 8

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

Which generator would you prefer for feeding long D.C. transmission lines ?

A. Series generator
B. Shunt generator
C. Over compound generator
D. Flat compound generator

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

A shunt generator running at 1000 r.p.m. has generated e.m.f. as 200 V. If the speed increases to 1200 r.p.m., the generated e.m.f. will be nearly_______________?

A. 150 v
B. 175 v
C. 240 v
D. 290 v

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

In D.C. generators on no-load, the air gap flux distribution in space is______________?

A. Sinusoidal
B. Triangular
C. Pulsating
D. Flat topped

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

In a D.C. generator the magnetic neutral axis coincides with the geometrical neutral axis, when_______________?

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