DC Generators The essential condition for parallel operation of two D.C. generators is that they have Same kW rating The same drooping voltage characteristics Same percentage regulation The same operation r.p.m. Same kW rating The same drooping voltage characteristics Same percentage regulation The same operation r.p.m. ANSWER DOWNLOAD EXAMIANS APP
DC Generators If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be Small The same as rated voltage High Zero Small The same as rated voltage High Zero ANSWER DOWNLOAD EXAMIANS APP
DC Generators The field winding of a dc shunt machine usually caries _______ of the rated current of the machine. Less than 0.5 % More than 20% 15 to 25% 2% to 5% Less than 0.5 % More than 20% 15 to 25% 2% to 5% ANSWER DOWNLOAD EXAMIANS APP
DC Generators The armature winding of a dc machine is place on the rotor to ______ Reduce armature reaction Save iron Reduce losses Facilitate commutation Reduce armature reaction Save iron Reduce losses Facilitate commutation ANSWER DOWNLOAD EXAMIANS APP
DC Generators To avoid formation of grooves in the commutator of a D.C. machine The brushes of opposite polarity should track each other All of these The brushes of same polarity should track each other Brush position has no effect on the commutator grooving The brushes of opposite polarity should track each other All of these The brushes of same polarity should track each other Brush position has no effect on the commutator grooving ANSWER DOWNLOAD EXAMIANS APP
DC Generators Inter-pole flux should be sufficient to Neutralize both the armature reaction flux as well as commutating e.m.f. induced in the coil None of these Neutralize the commutating self induced e.m.f. Neutralize the armature reaction flux Neutralize both the armature reaction flux as well as commutating e.m.f. induced in the coil None of these Neutralize the commutating self induced e.m.f. Neutralize the armature reaction flux ANSWER DOWNLOAD EXAMIANS APP
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