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Power Systems

Power Systems
Making current is a------------ value?

 peak value
 average
 RMS
 any of the above

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Power Systems
What is the approximate efficiency of a normal thermal power station?

 20-25%
 45-55%
 30-40%
 60-70%

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Power Systems
Bundled conductors in EHV transmission lines

 increase inductance
 increase capacitance
 decrease capacitance
 decrease inducatance

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Power Systems
A hydro electric generating station is supplied from a reservoir of capacity 5 × 10 − 6 cubic meters at a head of 200 meters. Find the total energy available in KWh if the overall efficiency is 75 %

 4.06 × 106 kWh.
  2.044 × 106 kWh.
 3 × 106 kWh.
 5 × 106 kWh.

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Power Systems
What are the methods of laying underground cables?

 Direct laying.
  Both A and B.
 None of these.
 Draw - in - system / duct - pipe laying.

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Power Systems
At slack bus, which one of the following combinations of variables is not specified?

 P and V
 P and Q
 V and δ
 Q and V

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