to avoid unequal distribution of current at the brushes
to help in reducing sparking
both the above
none of the above
1/2 of the original length
1/3 of the original length
3/4 of the original length
2/3 of the original length
2 amps
4 amps
10 amps
20 amps
same kilowatt output ratings
drooping voltage characteristics
same percentage regulation
same no load and full load speed
burning of switch contact
sudden loading of the prime mover
mechanical jerk to the shaft
all of the above