Power Systems Which of the following is/are the desirable properties of a insulator material? Low ratio of puncture strength to flash over. High ratio of puncture strength to flash over. Both 1 and 2 High relative permittivity Low ratio of puncture strength to flash over. High ratio of puncture strength to flash over. Both 1 and 2 High relative permittivity ANSWER DOWNLOAD EXAMIANS APP
Power Systems The inertia constant of 100 MVA, 50 Hz, 4 pole generator is 10 MJ/MVA. If the mechanical input to the machine is suddenly raised from 50 MW to 75 MW, the rotor acceleration will be equal to 225 electrical degrees/s² 12.5 electrical degrees/s² 22.5 electrical degrees/s² 125 electrical degrees/s² 225 electrical degrees/s² 12.5 electrical degrees/s² 22.5 electrical degrees/s² 125 electrical degrees/s² ANSWER DOWNLOAD EXAMIANS APP
Power Systems In a short circuit test circuit breaker, time to reach the peak re-striking voltage 60 microsecond & the peak re-striking voltage 120 kV. Determine average RRRV (Rate of rise re-striking voltage)? 2 × 106 kV / sec. 3 × 106 kV / sec. 3.5 × 106 kV / sec. 1 × 106 kV / sec. 2 × 106 kV / sec. 3 × 106 kV / sec. 3.5 × 106 kV / sec. 1 × 106 kV / sec. ANSWER DOWNLOAD EXAMIANS APP
Power Systems The rating of CB is in terms of current. volt - ampere. VAR. voltage. current. volt - ampere. VAR. voltage. ANSWER DOWNLOAD EXAMIANS APP
Power Systems An alternator having an induced emf of 1.6 pu is connected to an infinite bus of 1 pu. If the bus bar has reactance of 0.6 pu and alternator has reactance of 0.2 pu, what is the maximum power that can be transferred? 2 pu 6 pu 5 pu 2.67 pu 2 pu 6 pu 5 pu 2.67 pu ANSWER DOWNLOAD EXAMIANS APP
Power Systems Which of following materials can be used as coolant Heavy water. Helium. CO2. Any of above. Heavy water. Helium. CO2. Any of above. ANSWER DOWNLOAD EXAMIANS APP
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