A. copper is harder than mica
B. mica and copper are equally hard
C. mica is harder than copper
D. none of the above
A. external resistance = internal char-acteristic – armature reaction
B. internal characteristic = magnetisation characteristic – ohmic drop
C. external characteristic = magnetisation characteristic – ohmic drop – armature reaction
D. magnetisation characteristic = external characteristic
A. 100% regulation
B. infinite regulation
C. 50% regulation
D. 1% regulation
A. slots
B. armature conductors
C. winding elements
D. poles
A. is the same as that of the main pole ahead
B. is the same as that of the immediately preceding pole
C. is opposite to that of the main pole ahead
D. is neutral as these poles do not play part in generating e.m.f.
A. 4
B. 8
C. 16
D. 32
A. Self-excited generator
B. Separately excited generator
C. Level compounded generator
D. All of the above