A cumulatively compounded long shunt generator when operating as a motor would be____________?

A. reverse the field connections
B. increase the field resistance
C. increase the speed of primemover
D. check armature insulation resistance

A. abrasion from dust
B. excessive spring pressure
C. rough commutator bars
D. high mica insulation between com-mutation bars
E. all of the above factors

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. Insulation failure between two commutator bars
B. Insulation failure between two turns of a coil
C. Two of more turns of the same coil getting grounded
D. All of the above

A. where low voltage and high currents are involved
B. where high voltage and small cur-rents are involved
C. in both of the above cases
D. in none of the above cases

A. will be less than 250 V
B. will always be 250 V
C. may be greater or less than 250 V
D. none of the above