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Power Systems

Power Systems
Condition for maximum voltage regulation

 tanφ = X/R
 tanφ = R/X
 cosφ = X/R
 cosφ = R/X

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Power Systems
Mercury is choice with steam in binary vapor cycle because

 relative low vaporization pressure.
 higher critical temperature and pressure.
 higher saturation temperature than other fluids.
  all of above.

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Power Systems
In which of the following transmission lines capacitance effect is negligible?

 long transmission lines
 medium transmission lines
 shoart transmission lines
 both 1 and 3

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Power Systems
A loss less transmission line has a length of 600 km, find the phase shift of voltage signal?

 45°
 36°
 42°
 90°

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Power Systems
The per unit impedance Z(pu) is given by

 ZΩ* (kVA)b/(KV)²b
 ZΩ* (MVA)b/((KV)²b *100)
 ZΩ* (MVA)b*100/(KV)²b
 ZΩ* (MVA)b/(KV)²b

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Power Systems
The generating station suitable to operate as peak load plant is

 Nuclear power station.
 Thermal power station.
 Power station.
  Pumped storage.

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