low voltage, low current

high voltage, high current

low voltage, high current

high voltage, low current

shunt generator

series generator

long shunt compound generator

short shunt compound generator

60-80%

75-85%

80-90%

85-95%

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