Power Systems The corona loss on a particular system at 60 Hz is 1 kW/km per phase. What is the corona loss at 50 Hz in kW/km per phase? 0.882 1 0.93 1.13 0.882 1 0.93 1.13 ANSWER DOWNLOAD EXAMIANS APP
Power Systems Find the number of insulator discs required in string insulator, if operating voltage is 220 kV and maximum voltage of each disc is 11 kV? 20 13 21 10 20 13 21 10 ANSWER DOWNLOAD EXAMIANS APP
Power Systems If the diameter of the conductor is increased no change in inductance and resistance the inductance is decreased the inductance is increased the resistance is increased no change in inductance and resistance the inductance is decreased the inductance is increased the resistance is increased ANSWER DOWNLOAD EXAMIANS APP
Power Systems Maximum efficiency of modern coal fired steam raising thermal power plants is restricted to about 035 (a low value), mainly because of low steam turbine mechanical efficiency. low alternative efficiency. high energy loss from turbine exhaust to condenser. high energy loss in boiler. low steam turbine mechanical efficiency. low alternative efficiency. high energy loss from turbine exhaust to condenser. high energy loss in boiler. ANSWER DOWNLOAD EXAMIANS APP
Power Systems The per unit impedance Z(pu) is given by ZΩ* (MVA)b*100/(KV)²b ZΩ* (MVA)b/((KV)²b *100) ZΩ* (MVA)b/(KV)²b ZΩ* (kVA)b/(KV)²b ZΩ* (MVA)b*100/(KV)²b ZΩ* (MVA)b/((KV)²b *100) ZΩ* (MVA)b/(KV)²b ZΩ* (kVA)b/(KV)²b ANSWER DOWNLOAD EXAMIANS APP
Power Systems The positive, negative and zero sequence per unit impedance of two generators connected in parallel are X1 = 0.12 pu, X2 = 0.096 pu and X0 = 0.036 pu. For LG fault at generator terminals (with 1 pu voltage) the positive sequence current will be 9.936 pu 7.936 pu 8.936 pu 10.936 pu 9.936 pu 7.936 pu 8.936 pu 10.936 pu ANSWER DOWNLOAD EXAMIANS APP
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