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Power Systems

Power Systems
In a 4*4 Y bus matrix the number of non zero elements are 12. Find the sparsity of the system?

 1
 0.25
 0.75
 0.5

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

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Power Systems
Which of the following is/are the stator faults?

 over current
 Inter phase faults
All of these
 failure of excitation

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Power Systems
What is the function of economiser in steam boilers

 cooling
 improving thermal efficiency
 collect ash particals
All of these

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Power Systems
In a regenerative cycle, feed water is heated by

  drained steam from turbine.
 heaters.
 all of above.
 exhaust gas.

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Power Systems
If the fault current is 2000 A, the relay setting is 50% and CT ratio is 400 : 5, then plug setting multiplier will be

 10.
 50.
 15.
 25.

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