Electric Machines Mega Quiz 14

In a D.C. generator in order to reduce sparking at brushes, the self-induced e.m.f. in the coil is neutralised by all of the following except

In D.C. generators on no-load, the air gap flux distribution in space is

A shunt generator running at 1000 r.p.m. has generated e.m.f. as 200 V. If the speed increases to 1200 r.p.m., the generated e.m.f. will be nearly

The purpose of providing dummy coils in a generator is

In a shunt generator the voltage build up is generally restricted by