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Power Systems

Power Systems
Which of following materials can be used as coolant

 CO2.
 Heavy water.
  Any of above.
 Helium.

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Power Systems
A three phase, 33 kV oil circuit breaker is rated 1200 A, the symmetrical breaking capacity is 2000 MVA, 3 secs. Then the making capacity is

 5500 MVA.
  5100 MVA.
  5000 MVA.
 5200 MVA.

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Power Systems
The line current IR flowing into balanced delta connected load is - j5 - 3 A. If the phase sequence is RYB the phase current IYB is

  5.
 10.
 20.
 55.1.

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Power Systems
Phase shift occurs due to which of the following components?

 inductance
 conductance
 both 1 and 2
 capacitance

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Power Systems
The power output of a nuclear power station is proportional to

 square of the rate at which fission reaction occurs.
 square root of the rate at which fission reaction occurs.
  the rate at which fission reaction occurs.
 none of above.

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Power Systems
The power generated by two plants are; P1 = 50 MW, P2 = 40 MW. If the loss coefficients are B11 = 0.001, B22 = 0.0025 and B12 = -0.0005, then power loss will be

 4.5 MW
 8.5 MW
 6.5 MW
 5.5 MW

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