Electrical Machines If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is 115 V 200 V 460 V 230 V 115 V 200 V 460 V 230 V ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Maximum allowable moisture content of power transformer insulating oil is generally taken as 20 ppm. 45 ppm. 35 ppm. 25 ppm. 20 ppm. 45 ppm. 35 ppm. 25 ppm. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Use of fractional pitch winding All of these results in reduced axial length of the machine. make it stiffer. results in reduced leakage reactance. All of these results in reduced axial length of the machine. make it stiffer. results in reduced leakage reactance. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following statement is correct, if short circuit ratio is high? High voltage regulation None of these Low short circuit current Good voltage regulation High voltage regulation None of these Low short circuit current Good voltage regulation ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Synchronising power of a synchronous motor varies inversely as 1/Xs directly as Xs2 All of these directly as synchronous reactances Xs inversely as 1/Xs directly as Xs2 All of these directly as synchronous reactances Xs ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be reduced by 20% increased by 20% increased by 10% reduced by 10% reduced by 20% increased by 20% increased by 10% reduced by 10% ANSWER DOWNLOAD EXAMIANS APP
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