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Power Systems

Power Systems
Proximity effect is more in case of

None of these
 same in both cases
 over head lines
 power cables

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Power Systems
If power P available from a hydroelectric plant is given by the formula P = 9.81QH, where Q is the flow rate through the turbine in l / s and H is the head in meters, then P will be unit of

 HP.
 kJ / S.
 kWh.
  W.

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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?

 32 kV
 45 kV
 36 kV
 40 kV

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Power Systems
The thermal efficiency of BWR is

None of these
 less than that of PWR.
 greater than that of PWR.
  equal to that of PWR.

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Power Systems
The pu parameters for a 500 MVA machine on its own base are: Inertia, H = 20 pu; reactance X = 2 pu. The pu values of inertia and reactance on 100 MVA common base, respectively, are

 100, 10
 100, 0.4
 4, 0.4
 4, 10

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Power Systems
The essential requirement(s) for power plants to be operated as peak load plants are

 Low capital cost.
 Quick response to load variation.
 Capability of quick starts.
All of these

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