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Power Systems

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

All of these
 heavy water
 graphite
 beryllium

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Power Systems
In a 3-phase, 5 kV, 5 MVA system, what is the base impedance?

 500 ohms
 0.5 ohm
 5 ohms
 50 ohms

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Power Systems
Deaerative heating is done to

 heat the steam.
 remove dissolved.
  remove dissolved gases in water.
 heat the feed water.

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Power Systems
Four identical alternators each are rated for 20 MVA, 11 KV having a subtransient reactance of 16% are working in parallel. The short circuit level at the busbar is

 500 MVA
 100 MVA
 125 MVA
 400 MVA

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Power Systems
A 3 - Φ, 33 kV oil circuit breaker is rated 1200 A, 2000 MVA, 3 s. The symmetrical breaking current is

 104.8 kA.
 1200 A.
 3600 A.
  35 kA.

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Power Systems
String efficiency depends upon

 voltage rating of whole string.
 voltage rating of one SCR.
  all of these.
 no. of SCR in the string.

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