Power Systems A transmission line has self and mutual impedances of 0.8 pu and 0.2 pu. Find the positive, negative and zero sequence impedances respectively? 0.8, 0.6 and 1.2 pu 0.6, 0.8 and 1.2 pu 0.8, 0.8 and 1.2 pu 0.6, 0.6 and 1.2 pu 0.8, 0.6 and 1.2 pu 0.6, 0.8 and 1.2 pu 0.8, 0.8 and 1.2 pu 0.6, 0.6 and 1.2 pu ANSWER DOWNLOAD EXAMIANS APP
Power Systems Which of the following decides the insulation level of 400 kV, EHV line? switching over voltage skin effect lighting voltage radio interference switching over voltage skin effect lighting voltage radio interference ANSWER DOWNLOAD EXAMIANS APP
Power Systems To protect the power transformer ( Y-Y with neutral grounded) against fault, which type of connection do the current transformers have? Y-Δ connection Δ-Δ connection Y-Y connection Δ-Y connection Y-Δ connection Δ-Δ connection Y-Y connection Δ-Y connection ANSWER DOWNLOAD EXAMIANS APP
Power Systems Water hamming process in pen-stocks results in noise increases. noise increases, pressure increases, velocity decreases. pressure increases. None of these noise increases. noise increases, pressure increases, velocity decreases. pressure increases. None of these ANSWER DOWNLOAD EXAMIANS APP
Power Systems The arc voltage produced in an AC circuit breaker is always leading the arc current by 90°. in phase with the arc current. in phase opposition with the arc current. lagging the arc current by 90°. leading the arc current by 90°. in phase with the arc current. in phase opposition with the arc current. lagging the arc current by 90°. ANSWER DOWNLOAD EXAMIANS APP
Power Systems Zero voltage regulation is possible only for unity power factor lagging power factor leading power factor All of these unity power factor lagging power factor leading power factor All of these ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS