Electrical Machines When flux density is constant in a transformer, hysteresis loss varies as V f² V² f V f² V² f ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is 0.87 0.95 1.06 0.96 0.87 0.95 1.06 0.96 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Flux density under trailing pole tips in case of generator will either increase or decrease increase None of these decrease either increase or decrease increase None of these decrease ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The teeth in the armature of a DC machines are sometimes skewed. This is done to reduce copper loss. hysteresis loss. eddy electric current loss. vibrations. copper loss. hysteresis loss. eddy electric current loss. vibrations. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be 18° 72° 36° 30° 18° 72° 36° 30° ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The principle of operation of a 3 - Φ induction motor is almost similar to that of repulsion start induction motor. capacitor start induction motor. synchronous motor. transformer with secondary short circuited. repulsion start induction motor. capacitor start induction motor. synchronous motor. transformer with secondary short circuited. ANSWER DOWNLOAD EXAMIANS APP
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