Electrical Machines A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value? 0.04 0.02 0.4 0.2 0.04 0.02 0.4 0.2 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Why are capacitors used with large AC induction motor? Improve current level. Improve power factor. Improve power level. Improve voltage level. Improve current level. Improve power factor. Improve power level. Improve voltage level. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For satisfactory parallel operation of two transformers which of the following conditions is most essential, MVA rating of all transformer inversely proportional to impedance. voltage ratio of all transformers must be same. percentage impedance of all transformers must be same. polarities of all transformers must be same. MVA rating of all transformer inversely proportional to impedance. voltage ratio of all transformers must be same. percentage impedance of all transformers must be same. polarities of all transformers must be same. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following DC motors has almost constant speed over their full load range? Shunt. Series. Compound (cummolative). none of these. Shunt. Series. Compound (cummolative). none of these. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines φA DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the speed when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%. 960 RPM 940 RPM 920 RPM 970 RPM 960 RPM 940 RPM 920 RPM 970 RPM ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following pairs is/are correct? semi closed slot-----leakage flux is moderate open slot----- leakage flux is less closed slot----- leakage flux is high All of these semi closed slot-----leakage flux is moderate open slot----- leakage flux is less closed slot----- leakage flux is high All of these ANSWER DOWNLOAD EXAMIANS APP
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