Electrical Machines which of the following losses are negligible in blocked rotor test? copper loss mechanical loss iron loss both A and B copper loss mechanical loss iron loss both A and B ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following is/are effects of armature reaction? increase the iron loss increases the design cost All of these increase the maintenance and repair increase the iron loss increases the design cost All of these increase the maintenance and repair ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines DC machine windings are None of these short pitched either of these full pitched None of these short pitched either of these full pitched ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For a 3-phase, 4 pole, 50 Hz synchronous motor the frequency, pole number and the frequency are halved. The motor speed will be 75 rpm 1500 rpm 375 rpm 3000 rpm 75 rpm 1500 rpm 375 rpm 3000 rpm ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is 36.36% decrease 18.18% increase 36.36% increase 36.36% increase 36.36% decrease 18.18% increase 36.36% increase 36.36% increase ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following voltage regulation method is accurate ? MMf method Synchronous impedance method American standard association method ZPF method MMf method Synchronous impedance method American standard association method ZPF method ANSWER DOWNLOAD EXAMIANS APP
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