Electrical Machines A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be 30 W. 36 W. 28 W. 25 W. 30 W. 36 W. 28 W. 25 W. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm. Find the rotor efficiency? 94% 92% 95% 96% 94% 92% 95% 96% ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a transformer maximum flux density is not constant, the eddy current loss varies as V² f² f V V² f² f V ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a three phase star - delta transformer, what is the angle difference between primary and secondary phase voltages? Delta side leads by 30°. Star side leads by 30°. Delta side lags by -30°. Star side lags by -30°. Delta side leads by 30°. Star side leads by 30°. Delta side lags by -30°. Star side lags by -30°. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The armature shaft must be able to withstand All of these bending moment due to weight of the armature. twisting strains due to transmission of torque. any unbalanced magnetic pull on the armature core. All of these bending moment due to weight of the armature. twisting strains due to transmission of torque. any unbalanced magnetic pull on the armature core. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines On switching a DC motor to DC supply mains, it is found to rotate in the direction opposite to that for which it is designed. The DC motor is have an equal number of electrons and protons. Differentical compound. Cummulative compound. Series shunt. have an equal number of electrons and protons. Differentical compound. Cummulative compound. Series shunt. ANSWER DOWNLOAD EXAMIANS APP
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