Electrical Machines If the field current is reduced to zero the maximum power developed by alternator is 1.644 KW. 2.73 KW. 5.46 KW. 0.9103 KW. 1.644 KW. 2.73 KW. 5.46 KW. 0.9103 KW. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In 3 - Φ induction motor some times copper bars are placed deep in the rotor to improve starting torque. reduce copper loss. improve power factor. improve efficiency. improve starting torque. reduce copper loss. improve power factor. improve efficiency. 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? 40% 38% 68% 60% 40% 38% 68% 60% ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm. Find the rotor efficiency? 95% 94% 92% 96% 95% 94% 92% 96% ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In synchronous motor, the damper winding is generally used to reduce the eddy currents. reduce noise level only. prevent hunting and provide the starting torque. provide starting torque only. reduce the eddy currents. reduce noise level only. prevent hunting and provide the starting torque. provide starting torque only. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A dc shunt motor has external resistance Ra and Rf in the armature and field circuits respectively. Armature current at starting can be reduced by keeping Ra maximum and Rf maximum Ra maximum and Rf minimum Rf maximum and Ra minimum Ra minimum and Rf minimum Ra maximum and Rf maximum Ra maximum and Rf minimum Rf maximum and Ra minimum Ra minimum and Rf minimum ANSWER DOWNLOAD EXAMIANS APP
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