Electrical Machines A frog leg winding is used in a DC machine to eliminate reactance voltage produced due to communication. the use equalizer in lap winding. the use of compensating winding. the use drum winding. reactance voltage produced due to communication. the use equalizer in lap winding. the use of compensating winding. the use drum winding. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What will be the e.m.f. generated by a 4 pole lap connected DC Generator rotating at 1500 r.p.m.? Its flux per pole is 0.4 mWb and total no of armature conductors is 1000. 20 volts. 10 volts. 30 volts. 40 volts. 20 volts. 10 volts. 30 volts. 40 volts. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Considering a galvanometer is connected to the rotor of a 3 - Φ, 4 pole, 50 Hz IM and is making 130 oscillations in a minute, then calculate the rotor speed? 1435. 1450. 1500. 1440. 1435. 1450. 1500. 1440. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm? +3% -3% -3.33% +3.33% +3% -3% -3.33% +3.33% ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Two transformers with identical rating, are designed with flux densities of 1.2 and 1.4 Wb / m2 respectively. The weight of first transformer per kVA is equal to that of second transformer. none of these. less than that of second transformer. more than that of second transformer. equal to that of second transformer. none of these. less than that of second transformer. more than that of second transformer. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When operating, two or more transformers in parallel, % impedance of these transformers should be such that actual impedance of all transformers would be same. same. inversely proportional to MVA rating of transformers. proportionate to MVA rating of transformers. such that actual impedance of all transformers would be same. same. inversely proportional to MVA rating of transformers. proportionate to MVA rating of transformers. ANSWER DOWNLOAD EXAMIANS APP
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