Power Systems For 66 kV lines the number of insulator discs of each 11 kV used are 3 5 6 12 3 5 6 12 ANSWER DOWNLOAD EXAMIANS APP
Power Systems Two identical synchronous machines having same inertia constant are connected in parallel and swinging together. The effective inertia constant is 4 MJ/MVA. Then each machine has inertia constant of 8 MJ/MVA 4 MJ/MVA 2 MJ/MVA 16 MJ/MVA 8 MJ/MVA 4 MJ/MVA 2 MJ/MVA 16 MJ/MVA ANSWER DOWNLOAD EXAMIANS APP
Power Systems Power system network has a total power of 5000 MW at 50 Hz supplying to the different consumers. Frequency is varying at 1.5% per change of 2% load. Assume R =0.004 Hz/MW. Find the steady state frequency deviation if a sudden loss of 200 MW occur due to tripping of one of the transmission line? -0.52 Hz 0.52 Hz 50 Hz 0.48 Hz -0.52 Hz 0.52 Hz 50 Hz 0.48 Hz ANSWER DOWNLOAD EXAMIANS APP
Power Systems On what factor does the performance of a circuit breaker depend? Breaking speed. Critical length of breaking. None of these. Both A and C. Breaking speed. Critical length of breaking. None of these. Both A and C. ANSWER DOWNLOAD EXAMIANS APP
Power Systems Consider a long, two wire line composed of solid round conductors. The radius of both conductors is 0.25 cm and distance between their centers is 100 cm. If this distance is doubled, then the inductance per unit length. Halves. Doubled. Increase but does not doubled. Decrease but does not halves. Halves. Doubled. Increase but does not doubled. Decrease but does not halves. ANSWER DOWNLOAD EXAMIANS APP
Power Systems The main objectives of power system is/are Cost of electrical energy per KWh is to be minimum Reliable power has to be available All of these Flexible power has to be available. Cost of electrical energy per KWh is to be minimum Reliable power has to be available All of these Flexible power has to be available. ANSWER DOWNLOAD EXAMIANS APP
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