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Power Systems

Power Systems
Which of following materials can be used as coolant

 Helium.
  Any of above.
 CO2.
 Heavy water.

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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

 540×540
 553×553
 555×555
 554×554

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Power Systems
The function of reflector is to

 none of above.
 reduce the speed of the neutrons.
  bounce back most of the neutrons that escape from the fuel core.
 stop the chain reaction.

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Power Systems
An over current relay, having a current setting of 125% connected to a supply circuit through a current transformer of ratio 500/5. The plug setting multiplier for a fault current of 5 kA is

 5
 8
 6
 2

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Power Systems
The ABCD constants of a 3-phase transmission line are A = D = 0.8∠1°, B = 170∠85° Ω , C = 0.002∠90.4° â„§. The sending end voltage is 400 kV. The receiving end voltage under no load condition is

 600 kV
 350 kV
 500 kV
 400 kV

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Power Systems
In a short circuit test circuit breaker, time to reach the peak re-striking voltage 60 microsecond & the peak re-striking voltage 120 kV. Determine average RRRV (Rate of rise re-striking voltage)?

 1 × 106 kV / sec.
 3.5 × 106 kV / sec.
  3 × 106 kV / sec.
  2 × 106 kV / sec.

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