Electrical Machines 1 KVA, 230 V, 50 Hz, single phase transformer has an eddy current loss of 30 watts. The eddy current loss when the transformer is excited by a dc source of same voltage will be zero watt 30 W more than 30 W less than 30 W zero watt 30 W more than 30 W less than 30 W ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Wave winding is prefered for which of the following rating? low current and high voltage high current and high voltage low current and low voltage high current and low voltage low current and high voltage high current and high voltage low current and low voltage high current and low voltage ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In DC machines, the interpoles are provided to make commutation spark less. to counteract demagnetizing effect of armature mmf in commutating zone. both (B) and (C). to counteract the reactance voltage and the cross-magnetizi to make commutation spark less. to counteract demagnetizing effect of armature mmf in commutating zone. both (B) and (C). to counteract the reactance voltage and the cross-magnetizi ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________. increased. kept constant to certain value. decreased. remains same. increased. kept constant to certain value. decreased. remains same. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If two 8-pole dc machines of identical armature sare wound, one with lap winding and the other with wave winding, then lap-wound machine will have more rated voltage and less current wave-wound machine will have more rated current and more voltage lap-wound machine will have more rated voltage and more current wave-wound machine will have more rated voltage and less current lap-wound machine will have more rated voltage and less current wave-wound machine will have more rated current and more voltage lap-wound machine will have more rated voltage and more current wave-wound machine will have more rated voltage and less current ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines DC series motor is best suited for electric traction as It develops high starting torque. It is cheaper in cost. It consume less power. It runs at very high speed at light load. It develops high starting torque. It is cheaper in cost. It consume less power. It runs at very high speed at light load. ANSWER DOWNLOAD EXAMIANS APP
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