Electrical Machines What is the necessity of copper brushes in a dc motors? To convert alternating supply current to direct current. To absorb the mechanical shocks produced during running condition. To increase the flux cutting by the rotor. None of these. To convert alternating supply current to direct current. To absorb the mechanical shocks produced during running condition. To increase the flux cutting by the rotor. None of these. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Open circuit in a transformer is prefered with rated transformer current rated transformer voltage direct current high frequency supply rated transformer current rated transformer voltage direct current high frequency supply ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Open circuit test on transformer gives eddy current loss both 1and 2 hysteresis loss copper loss eddy current loss both 1and 2 hysteresis loss copper loss ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Armature flux is.............with respect to main field flux or main field poles? None of these stationary rotates same direction rotates opposite direction None of these stationary rotates same direction rotates opposite direction ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When a short circuit test on a transformer is performed at 25 V, 50 Hz, the drawn current is I1. If the test is performed by 25 V and 25 Hz and power drawn current is I2, then I1 = I2 I1 > I2 I1 < I2 None of these I1 = I2 I1 > I2 I1 < I2 None of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In escalator which motor is used? DC shunt motor. 1 - φ IM. 3 - φ IM. Universal motor. DC shunt motor. 1 - φ IM. 3 - φ IM. Universal motor. ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS