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Power Systems

Power Systems
Condition for zero voltage regulation is

 tanφ = R/X
 cosφ = R/X
 tanφ = X/R
 cosφ = X/R

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Power Systems
Where is the draft tube of a hydroelectric plant that is an airtight pipe located

 At the beginning of the penstock.
  In between the penstock and runner.
 In between the runner exhaust and the tail race.
 Near the surge tank.

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Power Systems
The pickup value of relay is 6.5 Amp and fault current in relay coil is 39 Amp. Its plug setting multiplier is

 10 A.
 8 A.
  6 A.
 7 A.

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Power Systems
A diesel power station has fuel consumption of 0.28 Kg per kWh. The calorific value of fuel is being 10000 KCal / kg. Determine the overall efficiency

  30.7 %.
 40.85 %.
 40 %.
  30.26 %.

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Power Systems
For n bus power system size of Y bus matrix is

 (n-1)×(n-2)
 (n-1)×(n-1)
 (n-2)×(n-2)
 n×n

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Power Systems
A gas turbine power plant is best suited for

 None of these.
 Peak load.
 Emergency.
 Base load.

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