Electric Machines Mega Quiz 9

(a) reduces generator e.m.f.

(b) increases armature speed

(c) reduces interpoles flux density

(d) results in sparking trouble

(a) electromagnets

(b) permanent magnets

(c) both (a) and (b)

(d) none of the above

(a) speed of armature

(b) type of winding

(c) voltage

(d) amount of current to be collected

(a) mainly to reduce the eddy currents by providing local short-circuits

(b) to provide path for the circulation of cooling air

(c) to neutralise the cross-magnetising effect of the armature reaction

(d) none of the above

(a) Dummy coils

(b) Commutator

(c) Eye bolt

(d) Equilizer rings