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Power Systems

Power Systems
Which of the following materials is/are used as moderators?

 heavy water
 beryllium
All of these
 graphite

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Power Systems
In which power plant, the thermal efficiency is quite low

  Hydro power plant.
  Diesel power plant.
  Steam power plant.
  Nuclear power plant.

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Power Systems
Rankine cycle efficiency of a steam power plant is of

  45 - 80 %.
  20 - 30 %.
  30 - 45 %.
  60 - 80 %.

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Power Systems
The sequence components of the fault current are as follows: IR1 = j1.5 pu, IR2 = -j0.5 pu, IR0 = -j1. The type of fault is

 LL
 LLL
 LG
 LLG

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Power Systems
To protect the power transformer ( Y-Y with neutral grounded) against fault, which type of connection do the current transformers have?

 Δ-Y connection
 Y-Y connection
 Y-Δ connection
 Δ-Δ connection

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Power Systems
A 10 MVA generator has reactance of 0.2 pu. Find the new reactance value for 50 MVA base?

 5 pu
 0.25 pu
 0.2 pu
 1 pu

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