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Power Systems

Power Systems
Which material is used in controlling chain reaction in a nuclear reactor

  Boron.
 Beryllium.
 Heavy water.
 Thorium.

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Power Systems
A cable has inductance of 0.22 mH per km and capacitance of 0.202 µF per km. The surge impedance of the cable is

 40 Ω
 28 Ω
 52 Ω
 33 Ω

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Power Systems
A power system consists of 300 buses out of which 20 buses are generator buses, 25 buses are the ones with reactive power support buses and 15 buses are ones with fixed shunt capacitors. All the other buses are load buses. It is proposed to perform a load flow analysis for the system using Newton-Raphson Jacobian matrix is

 555×555
 554×554
 540×540
 553×553

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Power Systems
What is the function of economiser in steam boilers

 collect ash particals
 cooling
 improving thermal efficiency
All of these

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Power Systems
Keeping in view the cost and overall effectiveness, the following circuit breaker is suited for capacitor bank switching

  oil.
  air blast.
  vacuum.
  SF6.

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Power Systems
What will be the ratio of the C.T. on the H.V side of a 3 - φ star / delta 33 / 11 kV transformer if the protecting CT on the LV side has a ratio of 300 : 5 ?

 150 : 4 / √3.
  100 : 5 / √3.
 120 : 6 / √3.
  200 : 5 / √3.

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