Electric Machines Mega Quiz 16

(a) along neutral axis

(b) along field axis

(c) in any of the above positions

(d) in none of the above positions

(a) cumulatively compounded long shunt

(b) differentially compounded long shunt

(c) cumulatively compounded short shunt

(d) differentially compounded short shunt

(a) the brushes of opposite polarity should track each other

(b) the brushes of same polarity should track each other

(c) brush position has no effect on the commutator grooving

none

(a) Insulation failure between two com-mutator 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) 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