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Power Systems

Power Systems
Find the surge impedance of a line when inductance is 160 mH and capacitance is 1µF?

 800 Ω
 200 Ω
 160 Ω
 400 Ω

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Power Systems
Which of the following grounding is not practically preferred for protection of equipments?

 resistance grounding
 reactance grounding
All of these
 isolated grounding

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Power Systems
Frequencies must be same in which of the following line to exchange the power from one place to other place ?

 No need of same frequency for exchange of power
 Asynchronous line
 Synchronous line
 both 1 and 2

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Power Systems
For load flow studies, What are the quantities specified at load bus are

 V and δ
 P and V
 δ and Q
 P and Q

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Power Systems
A transmission line has a surge impedance of 400 Ω is connected with the cable having surge impedance of 40 Ω, a surge magnitude of 100 kV is travelling from the transmission line towards the cable. Find the incident current?

 2500 A
 100 A
 200 A
 250 A

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Power Systems
What should be the minimum depth (in metre)of cable trench to dug for laying of 1.1 kV?

 0.90.
 1.20.
 1.05.
  0.75.

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