Electrical Machines A DC generator beyond critical resistance will generate maximum voltage. maximum power. maximum current. no voltage. maximum voltage. maximum power. maximum current. no voltage. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When excitation is increased (over excitation), the synchronous generator operates at any of the above. unity power factor. leading power factor. lagging power factor. any of the above. unity power factor. leading power factor. lagging power factor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines DC generators are usually designed to develop armature voltages not exceeding 650 V because of the limitations imposed by commutator armature winding starters field winding commutator armature winding starters field winding ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines During hunting of a synchronous motor damper bar develops torque. field excitation increases. harmonic are developed in the armature circuit. negative phase sequence currents are generated. damper bar develops torque. field excitation increases. harmonic are developed in the armature circuit. negative phase sequence currents are generated. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If Pi and Pc represent core and full load copper loss respectively, the maximum KVA delivered to load corresponding to maximum efficiency is equal to rated KVA is √(Pi/Pc) (Pi/Pc)2 Pi/Pc Pc/Pi √(Pi/Pc) (Pi/Pc)2 Pi/Pc Pc/Pi ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A transformer core is made up of a silicon steel laminations which has maximum flux density 1 Tesla. If it was cold rolled grain oriented its flux density increases to 1.6 Tesla. What is the saving in core size or area due to cold rolled grain oriented process? 68% 38% 60% 40% 68% 38% 60% 40% ANSWER DOWNLOAD EXAMIANS APP
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