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Power Systems

Power Systems
Which of the following is used in thermal plants

All of these
 Rankine cycle
 Otto cycle
 Joule cycle

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Power Systems
The voltage and current instantaneous values are given as 5 sin (ωt + 30°) pu and 2 sin (ωt - 15°) pu respectively. Find the per unit active power?

 5.353 pu
 5 pu
 7 pu
 3.535 pu

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Power Systems
To improve the efficiency of thermal power plant ________________ is placed between boiler and turbine.

  air preheater.
  superheater.
  economizer.
  ash handling point.

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Power Systems
A thermal protection relay provides protection against what?

 Over load
 Short circuit
 any of the above
 Temperature

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Power Systems
Consider a long, two wire line composed of solid round conductors. The radius of both conductors is 0.25 cm and distance between their centers is 100 cm. If this distance is doubled, then the inductance per unit length.

 Decrease but does not halves.
 Halves.
 Doubled.
  Increase but does not doubled.

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Power Systems
A transmission line is operating under no load has ABCD parameters B = 100∠90° has a phase shift of 0.2 rad, how much shunt reactor is required for compensation of ferranti effect?

 15.9 mH
 15.9 H
 2 H
 2 mH

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