Power Systems A Pelton wheel turbine having a rated speed of 300 rpm is connected to an alternator to produce power at 50 Hz. The number of poles required in the alternator is 20 4 8 10 20 4 8 10 ANSWER DOWNLOAD EXAMIANS APP
Power Systems For accurate load flow calculations on large power systems, the best method is G-S method N-R method Decoupled method All of these G-S method N-R method Decoupled method All of these ANSWER DOWNLOAD EXAMIANS APP
Power Systems Resistance switching in normally employed in bulk oil breakers. air blast circuit breaker. minimum oil breakers. all breakers. bulk oil breakers. air blast circuit breaker. minimum oil breakers. all breakers. 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 high energy loss from turbine exhaust to condenser. low steam turbine mechanical efficiency. low alternative efficiency. high energy loss in boiler. high energy loss from turbine exhaust to condenser. low steam turbine mechanical efficiency. low alternative efficiency. high energy loss in boiler. ANSWER DOWNLOAD EXAMIANS APP
Power Systems Advantages of per unit system is/are Need of transformation ratio No units for any quantity It has units for all quantities All of these Need of transformation ratio No units for any quantity It has units for all quantities All of these ANSWER DOWNLOAD EXAMIANS APP
Power Systems A transmission line has a surge impedance of 400 Ω for a length of the line of 200 km. If the length of line is increased to 400 km, then its surge impedance is 0 Ω 800 Ω 400 Ω 200 Ω 0 Ω 800 Ω 400 Ω 200 Ω ANSWER DOWNLOAD EXAMIANS APP
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