Electrical Machines A 3 - Φ, 4 pole IM is supplied from a 50 Hz source. Calculate rotor frequency when rotor runs 600 rpm? 30 Hz. Can be determined. 20 Hz. 35 Hz. 30 Hz. Can be determined. 20 Hz. 35 Hz. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Breather is provided in a transformer to provide cold air in transformer. absorb moisture from air entering in transformer. absorb moisture of air during breathing. filter the transformer oil. provide cold air in transformer. absorb moisture from air entering in transformer. absorb moisture of air during breathing. filter the transformer oil. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The armature mmf in a dc machine is 1. stationary with respect to field poles 2. stationary with respect to armature 3. rotating with respect to field poles 4. rotating with respect to armature From these, the correct answer is 2, 4 1, 3 2, 3 1, 4 2, 4 1, 3 2, 3 1, 4 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For the same power output rating and full load speed, the motor will have poorest starting torque, is Series. Cummulative compound. Differential compound. Shunt. Series. Cummulative compound. Differential compound. Shunt. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For a given torque, reducing diverter resistance of a DC series motor causes increase in speed but armature currnet remains the same. increase in speed demanding more armature current. decrease in speed but armature current remains the same. decrease in speed demanding less armature current. increase in speed but armature currnet remains the same. increase in speed demanding more armature current. decrease in speed but armature current remains the same. decrease in speed demanding less armature current. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Conservator tank is used None of these to act as an oil storage. to take up the expansion of oil due to temperature rise. for better cooling of transformer. None of these to act as an oil storage. to take up the expansion of oil due to temperature rise. for better cooling of transformer. ANSWER DOWNLOAD EXAMIANS APP
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