Electrical Machines In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________. kept constant to certain value. decreased. increased. remains same. kept constant to certain value. decreased. increased. remains same. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A part an alternator winding consist of eight coils in series, each having an emf of 20 V rms induced in it. Coils are placed in successive slots and between each slot and the next, there is an electrical phase displacement of 30°. Find the emf of eight coils in series 86.91 V. 56.91 V. 76.91 V. 66.91 V. 86.91 V. 56.91 V. 76.91 V. 66.91 V. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Secondary winding of an auto transformer is also called damping winding. tertiary winding. compensating winding. common winding. damping winding. tertiary winding. compensating winding. common winding. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to 480 V. 400 V. 420 V. 350 V. 480 V. 400 V. 420 V. 350 V. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Current in a coil undergoing commutation is not able to get reversed completely by the end of commutation period. It is due to armature emf. coil resistance. None of these reactance voltage induced in the coil. armature emf. coil resistance. None of these reactance voltage induced in the coil. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following represents the rotating losses of machine? Hysteresis losses Friction and windage losses All of the them Eddy current losses Hysteresis losses Friction and windage losses All of the them Eddy current losses ANSWER DOWNLOAD EXAMIANS APP
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