A. crossmagnetising
B. demagnetising
C. magnetising
D. none of above
A. severe sparking
B. rough commutator surface
C. imperfect contact
D. any of the above
A. silicon steel
B. copper
C. non-ferrous material
D. cast-iron
A. The direction of that generator is reversed
B. The speed of that generator is increased
C. The field of that generator is weakened
D. That generator takes large of loads
A. to reduce eddy current losses
B. to enhance flux density
C. to amplify voltage
D. to provide mechanical balance for the rotor
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. lap winding
B. wave winding
C. delta winding
D. duplex wave winding