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Power Systems

Power Systems
A string type insulator has three units with self capacitance C and ground capacitance of 0.2 C having a string efficiency of

 76%
 80%
 78%
 82%

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Power Systems
Which of the following transmission line is most practically used in load flow analysis?

 nether 1 nor 2
 Nominal ∏
 Nominal T
 either 1 or 2

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Power Systems
When reactance grounding is used in network, the voltage between neutral and ground is

 IR0 × Xn
 both 1 and 3
 3×IR0 × Xn
 IN × Xn

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Power Systems
A thermal protection relay provides protection against what?

 Over load
 any of the above
 Temperature
 Short circuit

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Power Systems
In Francis turbine runner, the number blades is usually of the order of

  16 - 24.
 3 - 6.
 12 - 14.
 6 - 8.

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Power Systems
A 3-phase transmission line operating at Vs = 400 kV and has ABCD parameters A= D = 0.8∠0°, B = 100∠90° Ω, C = 0.5*10^-6∠90° â„§. Find the shunt reactor required for compensating ferranti effect?

 1500 Ω
 500 Ω
 2000 Ω
 3000 Ω

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