Power Systems On a power system network the load is increasing represents the value of impedance remains constant. none of above. increase. decrease. remains constant. none of above. increase. decrease. ANSWER DOWNLOAD EXAMIANS APP
Power Systems In coal fired thermal power stations, what are the electrostatic precipitators used for? To keep the air heaters clean All of these To remove dust particles setting on the bus bar conductors in the station switch yard To collect the dust particles from the flue gases To keep the air heaters clean All of these To remove dust particles setting on the bus bar conductors in the station switch yard To collect the dust particles from the flue gases ANSWER DOWNLOAD EXAMIANS APP
Power Systems The neutral of 10 MVA, 11 kV alternator is earthed through a resistance of 5 ohms. The fault ready is set to operate at 0.75 A. The current transformers have a ratio of 1000/5. What is the percentage of the alternator winding is protected? 85% 15% 11.8% 88.2% 85% 15% 11.8% 88.2% ANSWER DOWNLOAD EXAMIANS APP
Power Systems Gross head of an hydroelectric power station is the difference of water level between the level in storage and tail race. the height of water level in the river where the storage is provided. all of above. the height of water level in the river where the tail race is provided. the difference of water level between the level in storage and tail race. the height of water level in the river where the storage is provided. all of above. the height of water level in the river where the tail race is provided. ANSWER DOWNLOAD EXAMIANS APP
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%. 52.84 kV 48.36 kV 20 kV 83.76 kV 52.84 kV 48.36 kV 20 kV 83.76 kV ANSWER DOWNLOAD EXAMIANS APP
Power Systems One million cubic meters of water is stored in a reservoir feeding a water turbine. The density of water is 993 kg/m³. If the centre of mass of water is 50 meters above the turbine and losses are negligible, the energy produced by that volume of water is 130.2 MWhr 140 MWhr 120 MWhr 135.3 MWhr 130.2 MWhr 140 MWhr 120 MWhr 135.3 MWhr ANSWER DOWNLOAD EXAMIANS APP
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