Power Systems A three phase, 33 kV oil circuit breaker is rated 1200 A, 2000 MVA, 3 secs. The symmetrical breaking current is 55 kA. 50 kA. 35 kA. 45 kA. 55 kA. 50 kA. 35 kA. 45 kA. ANSWER DOWNLOAD EXAMIANS APP
Power Systems A fuse wire of circular cross-section has a radius of 0.8 mm. The wire blows off at an current of 8 Amp. Calculate the radius of wire that will blow off at an current of 1 amp? 2 mm. 0.4 mm. 4 mm. 0.2 mm. 2 mm. 0.4 mm. 4 mm. 0.2 mm. ANSWER DOWNLOAD EXAMIANS APP
Power Systems A pin type insulator has 100 kV puncture voltage. If 10 kV flash over voltage occurred in a transmission line, then find the safety factor of insulator? 1000 0.1 10 0.001 1000 0.1 10 0.001 ANSWER DOWNLOAD EXAMIANS APP
Power Systems A 1- phase transmission line operating at 30 kV has radius of 1 cm and distance between conductors is 0.5 m. Assume m = δ =1, g = 21 kV/cm and frequency f = 50 Hz. Find the critical disruptive voltage? 17.32 kV/phase 34.64 kV/phase 41.075 kV/phase 82.15 kV/phase 17.32 kV/phase 34.64 kV/phase 41.075 kV/phase 82.15 kV/phase ANSWER DOWNLOAD EXAMIANS APP
Power Systems On what factor does the performance of a circuit breaker depend? None of these. Breaking speed. Both A and C. Critical length of breaking. None of these. Breaking speed. Both A and C. Critical length of breaking. ANSWER DOWNLOAD EXAMIANS APP
Power Systems Two generating stations delivering a powers of P1 = 150 MW, P2 =100 MW and the B coefficients are B11 = 0.005, B22 = 0.002, B12=B21= -0.001. Find the transmission line losses? 95.5 105.2 102.5 85.5 95.5 105.2 102.5 85.5 ANSWER DOWNLOAD EXAMIANS APP
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