Electrical Machines What will happen if the the supply terminals are reversed in case of a DC shunt motor? The motor will run at its normal speed in the same direction as before. The motor will run in reverse direction. The motor will run much faster in the same direction. The motor will stop. The motor will run at its normal speed in the same direction as before. The motor will run in reverse direction. The motor will run much faster in the same direction. The motor will stop. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The counter (or back) emf in a dc machine is 1. the same as generated emf in a dc motor 2. proportional to field flux and armature speed 3. not the same as generated emf in a dc motor 4.inversely proportional to field flux 5. proportional to number of armature conductors 6. constant from no load to full load From these, the correct answer is 3, 4, 5 1, 2, 5 2, 4, 5, 6 2, 3, 6 3, 4, 5 1, 2, 5 2, 4, 5, 6 2, 3, 6 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The use of higher flux density in the transformer design increases the weigh per KVA has no relation with the weight of transformer None of these reduces the weigh per KVA increases the weigh per KVA has no relation with the weight of transformer None of these reduces the weigh per KVA ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip? 2.5Hz 2HZ 1 Hz 50Hz 2.5Hz 2HZ 1 Hz 50Hz ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The no load current in a transformer lags the applied voltage by 90°. 0°. about 115°. about 75°. 90°. 0°. about 115°. about 75°. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The DC compound motors are generally Level Compound. Cummulative compound. Differentical compound. None of these. Level Compound. Cummulative compound. Differentical compound. None of these. ANSWER DOWNLOAD EXAMIANS APP
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