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Power Systems

Power Systems
A 20 MVA generator has inertia constant of 0.5 pu. Find new value for 50 MVA base?

 0.2 pu
 0.5 pu
 0.4 pu
 0.1 pu

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Power Systems
For symmetrical network, the neutral current is

 maximum
 any of the above
 infinity
 zero

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Power Systems
A penstock is used as a condition between

  the dam and the turbine in a hydro station.
 none of above.
 the turbine and discharge drain.
 the heat ex-changer and the turbine in nuclear power plant.

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

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

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Power Systems
Most commonly used material for insulator is

 mica
 glass
 porcelain
All of these

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Power Systems
The pu parameters for a 500 MVA machine on its own base are: Inertia, H = 20 pu; reactance X = 2 pu. The pu values of inertia and reactance on 100 MVA common base, respectively, are

 100, 10
 100, 0.4
 4, 10
 4, 0.4

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