Electrical Machines In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be Around 90 % Around 100 %. Less than 50 % Any where between 75 % and 90 %. Around 90 % Around 100 %. Less than 50 % Any where between 75 % and 90 %. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The power developed by salient pole synchronous machine is/are power due to saliency or reluctance only both 1 and 2 None of these excitation power only power due to saliency or reluctance only both 1 and 2 None of these excitation power only ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Fifth harmonic component of the induced voltage in three phase AC generator can be eliminated by using a winding pitch of 2 / 3. 5 / 6. 4 / 5. 6 / 7. 2 / 3. 5 / 6. 4 / 5. 6 / 7. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following methods of speed control is not affected through stator side? Change of rotor resistance. Change of supply frequency. Change of number of pole. Change of supply voltage. Change of rotor resistance. Change of supply frequency. Change of number of pole. Change of supply voltage. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The DC generator runs at a speed of 1000 rpm and flux per pole is 0.2 Wb, number of poles are 2 the winding is wave wound and having 480 conductors. The critical speed is 1200 rpm. Then the generated emf ( Eg ) 2000 Volt. 1600 Volt. 1500 Volt. 0 Volt. 2000 Volt. 1600 Volt. 1500 Volt. 0 Volt. ANSWER DOWNLOAD EXAMIANS APP
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 less than 30 W more than 30 W zero watt 30 W less than 30 W more than 30 W zero watt 30 W ANSWER DOWNLOAD EXAMIANS APP
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