Power Systems What is the approximate efficiency of a normal thermal power station? 20-25% 60-70% 30-40% 45-55% 20-25% 60-70% 30-40% 45-55% ANSWER DOWNLOAD EXAMIANS APP
Power Systems Three generators rated 100 MVA, 11 kV have an impedance of 0.15 pu each. If in the same plant, these generators are being replaced by a single equivalent generator, the effective impedance of equivalent generator will be 0.15 pu 0.25 pu 0.45 pu 0.05 pu 0.15 pu 0.25 pu 0.45 pu 0.05 pu 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 800 Ω 0 Ω 200 Ω 400 Ω 800 Ω 0 Ω 200 Ω 400 Ω ANSWER DOWNLOAD EXAMIANS APP
Power Systems IF the time of operation of a relay for unity TMS is 10 sec then the time of operation for 0.5 TMS is 10 sec. 20 sec. none of these. 5 sec. 10 sec. 20 sec. none of these. 5 sec. ANSWER DOWNLOAD EXAMIANS APP
Power Systems The insulation of the modern EHV lines is designed based on corona. R × I. the lighting voltage. the switch voltage. corona. R × I. the lighting voltage. the switch voltage. ANSWER DOWNLOAD EXAMIANS APP
Power Systems On a power system network the load is increasing represents the value of impedance decrease. none of above. remains constant. increase. decrease. none of above. remains constant. increase. ANSWER DOWNLOAD EXAMIANS APP
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