Power Systems In a 3-phase transmission line, each phase is supported by 3 insulated discs, maximum voltage of each disc is 20 kV. Find the operating voltage of the transmission line per phase if efficiency of string is 80.6%. 48.36 kV 20 kV 52.84 kV 83.76 kV 48.36 kV 20 kV 52.84 kV 83.76 kV ANSWER DOWNLOAD EXAMIANS APP
Power Systems Which of the following power planets is the least reliable Tidal. Wind. Solar. Geothermal. Tidal. Wind. Solar. Geothermal. 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? 13 21 10 20 13 21 10 20 ANSWER DOWNLOAD EXAMIANS APP
Power Systems The time taken by the turbine to fall to 0 rpm speed from 3000 rpm is called settling time. damping time. coasting time. stopping time. settling time. damping time. coasting time. stopping time. ANSWER DOWNLOAD EXAMIANS APP
Power Systems The positive, negative and zero sequence impedances of a transmission line are 0.5,0.5 and 1.1 pu respectively. The self (Zs) and mutual (Zm) impedances of the line will be given by Zs = 0.7 pu, Zm =0.2 pu Zs = 0.2 pu, Zm =0.7 pu Zs = 0.5 pu, Zm =0.6 pu Zs = 0.6 pu, Zm =0.5 pu Zs = 0.7 pu, Zm =0.2 pu Zs = 0.2 pu, Zm =0.7 pu Zs = 0.5 pu, Zm =0.6 pu Zs = 0.6 pu, Zm =0.5 pu ANSWER DOWNLOAD EXAMIANS APP
Power Systems In a 220 kV system, the inductance and capacitance up to the circuit breaker location are 25 mH and 0.025 µF respectively. The value of resistor required to be connected across the breaker contacts which will give no transient oscillations, is 1000 Ω 25 Ω 500 Ω 250 Ω 1000 Ω 25 Ω 500 Ω 250 Ω ANSWER DOWNLOAD EXAMIANS APP
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