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Power Systems

Power Systems
Operating time of pumped storage plant is

 very high
 can't say
 low
 high

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Power Systems
Corona is accompanied by

All of these
 hissing sound
 power loss and interference
 violet visible light

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Power Systems
The ground capacitance existing between transmission line and ground is 4µF. Find the inductive reactance of the peterson coil for compensation of arcing grounds?

 265.25 Ω
 0.844 Ω
 625.35 Ω
 855.26 Ω

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Power Systems
In load flow studies PV bus is treated as PQ bus when

 any of the above
 voltage at the bus become high
 phase angle become high
 reactive power goes beyond limit

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Power Systems
A transmission line has self and mutual impedances are 0.8 and 0 pu respectively. Find the positive, negative and zero sequence impedances respectively?

 0.6, 0.8 and 1.2 pu
 0.6, 0.6 and 0.6 pu
 0.6, 0.6 and 1.2 pu
 0.8, 0.8 and 0.8 pu

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Power Systems
Aluminium is now most commonly employed conductor material in transmission lines than copper because

 it is cheaper and lighter
 costlier
 its tensile strength is more
 it is more conductive

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