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Power Systems

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

 Thorium.
  Boron.
 Beryllium.
 Heavy water.

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Power Systems
Positive, negative and zero sequence impedances of line are 2,2 and 5 pu respectively. Find self and mutual impedances respectively?

 2 and 5 pu
 3 and 1 pu
 2 and 2 pu
 1 and 3 pu

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Power Systems
A string insulator has 4 units. The voltage across bottom most unit is 10 kV and its efficiency is 90%. Find the total operating phase voltage?

 40 kV
 36 kV
 32 kV
 45 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 × 106 kV / sec.
 3.5 × 106 kV / sec.
  2 × 106 kV / sec.

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Power Systems
Apart from the skin effect the non uniformity of the current distribution is also caused by

All of these
 proximity effect
 ferranti effect
 bundled conductors

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Power Systems
Under over excitation synchronous phase modifier works as

 series capacitor
 shunt reactor
 shunt capacitor
 any of the above

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