Category: D.C. Generators

A. oscillating magnetic field
B. pulsating magnetic flux
C. relative rotation between field and armature
D. all above

A. Series generator
B. Shunt generator
C. Compound generator
D. Separately excited generator

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

A. armature reaction
B. armature resistance drop
C. field weakening due to armature reaction and armature
D. commutation

A. to avoid sudden loading of the primemover
B. to avoid mechanicaljerk to the shaft
C. to avoid burning of switch contacts
D. all above

A. total copper loss and mechanical loss
B. armature copper loss and iron loss
C. shunt field copper loss and mechanical loss
D. iron loss and mechanical loss

A. double the number of poles
B. same as the number of poles
C. half the number of poles
D. two

A. is amenable to better voltage control
B. is more stable
C. has exciting current independent of load current
D. has all above features

A. current
B. voltage
C. speed
D. none of above

A. all the four poles are north poles
B. alternate poles are north and south
C. all the four poles are south poles
D. two north poles follow two south poles