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Power Systems

Power Systems
Which of following materials can be used as coolant

 CO2.
  Any of above.
 Helium.
 Heavy water.

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Power Systems
In which of the following frequency control method tie line may be overloaded?

All of these
 flat frequency control
 flat tie line control
 parallel frequency

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Power Systems
Buchholz relay is used for protection of

  bus bar.
  transformer.
  none of these.
  alternator.

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Power Systems
A steam power generation has an overall efficiency of 20 %. 0.6 Kg of coal is burnt per kWh of electrical energy generated. Calculated the calorific value of fuel

 7562 KCal / Kg.
  7166.67 KCal / Kg.
 7000 KCal / Kg.
 7268.45 KCal / Kg.

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Power Systems
A 3 layer and diameter of each strand is d, then find the total diameter of ACSR conductor?

 5d
 d
 3d
 2d

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

 0.1 pu
 0.2 pu
 0.5 pu
 0.4 pu

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