Electrical Machines If the back emf in DC motor vanishes suddenly the motor will run at very low speed. run at very high speed. burn. start haunting. run at very low speed. run at very high speed. burn. start haunting. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a DC Motor 3 point starter is used to all of above. provide protection against Low-Voltage. provide overload protection. limit the starting current to a safer value. all of above. provide protection against Low-Voltage. provide overload protection. limit the starting current to a safer value. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If Ke is eddy current constant, Kf is form factor, f is supply frequency, Bm maximum flux density in core of transformer, the expression of eddy current loss in transformer, is given by Kef2Kf2Bm2. Kef2KfBm2. Kef2Kf2Bm. KefKf2Bm2. Kef2Kf2Bm2. Kef2KfBm2. Kef2Kf2Bm. KefKf2Bm2. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Armature reaction of an unsaturated DC machine is none of above. demagnetising. crossmagnetising. magnetising. none of above. demagnetising. crossmagnetising. magnetising. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be 72° 36° 18° 30° 72° 36° 18° 30° ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 4 pole DC shunt generator having a wave winding supplies 50 lamps, each of 60 W at 120 V. The armature and field resistance are 0.2 Ω and 60 Ω respectively. The current in each armature conductor is 23 A. 13.5 A. 11.5 A. 27 A. 23 A. 13.5 A. 11.5 A. 27 A. ANSWER DOWNLOAD EXAMIANS APP
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