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 400 Ω 0 Ω 200 Ω 800 Ω 400 Ω 0 Ω 200 Ω 800 Ω ANSWER DOWNLOAD EXAMIANS APP
Power Systems The modern trend in electric power generation to have large size thermal plant located near coal fields. none of above. to have large number of small size thermal plants located at different places. to have large size thermal plants near load centre. to have large size thermal plant located near coal fields. none of above. to have large number of small size thermal plants located at different places. to have large size thermal plants near load centre. ANSWER DOWNLOAD EXAMIANS APP
Power Systems The presence of earth in case of overhead lines decrease inducatance decrease capacitance increase capacitance increase inductance decrease inducatance decrease capacitance increase capacitance increase inductance ANSWER DOWNLOAD EXAMIANS APP
Power Systems An unloaded generator with a pre-fault voltage 1 pu has the following sequence impedance: Z0 = j 0.15 pu, Z1 = Z2 = j 0.25 pu The neutral is grounded with a reactance of 0.05 pu. The fault current in pu for single line to ground fault is 3.75 pu 4.28 pu 2.5 pu 7.25 pu 3.75 pu 4.28 pu 2.5 pu 7.25 pu ANSWER DOWNLOAD EXAMIANS APP
Power Systems A power station has a maximum demand of 15000 kW. The annual load factor is 50% and plant capacity factor is 40%. What is the reserve capacity of the plant? 3750 kW 7500 kW 6000 kW 3000 kW 3750 kW 7500 kW 6000 kW 3000 kW ANSWER DOWNLOAD EXAMIANS APP
Power Systems At slack bus, which one of the following combinations of variables is not specified? P and Q Q and V P and V V and δ P and Q Q and V P and V V and δ ANSWER DOWNLOAD EXAMIANS APP
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