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Power Systems

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

 400 Ω
 200 Ω
 160 Ω
 800 Ω

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Power Systems
The most suitable circuit breaker for short line fault without switching resistor is

 air blast circuit breaker.
 none of these.
  SF6 breaker.
 oil circuit breaker.

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Power Systems
If the inertia constant H = 8 MJ/MVA for a 50 MVA generator, the stored energy is

 50 MJ
 200 MJ
 400 MJ
 8 MJ

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Power Systems
The SWR on a lossless transmission line of the characteristic impedance 100 ohm is 3. The line is the terminated by

 A resistance of 100 ohm.
 A resistance of j300 ohm.
 A resistance of 100/3 ohm.
 A resistance of j100/3 ohm.

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Power Systems
In a thermal power plants, pressure in the working fluid cycle is developed by

 turbine.
  feed water pump.
 superheater.
 condenser.

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Power Systems
A thermal protection switch is used to provide protection against

 short circuit.
 temperature.
 over voltage.
  overload.

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