Electrical Machines Autotransformer makes effective saving on copper and copper losses, when its transformation ratio is equal to very low less than one. approx to one. greater than one. very low less than one. approx to one. greater than one. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A short circuit test on a transformer gives copper loss at over load. copper loss at half load. copper loss at any load. copper loss at full load. copper loss at over load. copper loss at half load. copper loss at any load. copper loss at full load. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The slight curvature at the lower end of the OCC of a self excited DC generator is due to high speed. magnetic inertia. high field resistance. residual flux. high speed. magnetic inertia. high field resistance. residual flux. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of following DC motors will have percentage increase of input current for the same percentage increase in torque? Shunt. Series. Cummulative compound. Differntical compound. Shunt. Series. Cummulative compound. Differntical compound. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Unbalanced supply voltage given to a 3 - φ, delta connected induction motor will cause less heating of the rotor. less heating of the rotor. all of these. negative sequence current. less heating of the rotor. less heating of the rotor. all of these. negative sequence current. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The synchronous speed of an induction motor will be increased by increasing number of poles. increasing of frequency. decreasing of frequency. speed can not be increased. increasing number of poles. increasing of frequency. decreasing of frequency. speed can not be increased. ANSWER DOWNLOAD EXAMIANS APP
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