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Power Systems

Power Systems
Rankine cycle efficiency of a steam power plant is of

  20 - 30 %.
  60 - 80 %.
  45 - 80 %.
  30 - 45 %.

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Power Systems
Which of the following power plants needs highly skilled/qualified engineers for its operation

 Gas-turbine.
 Nuclear.
 Thermal.
 Hydro Power Plant

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Power Systems
If a 500 MVA, 11 kV 3-phase generator at 50 Hz feeds through a transfer impedance of (0+j0.605) Ω/phase, an infinite voltage also at 11 kV, then the maximum steady state power transfer on the base of 500 MVA and 11 kV is

 0.4 pu
 0.8 pu
 1 pu
 0.5 pu

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Power Systems
An ACSR conductor has a diameter of 2 cm has internal inductance of 0.05 mH/Km. If this ACSR is replaced with another having a diameter of 4 cm then its internal inductance is

 0.025 mH/Km
 0.05 mH/Km
 0.1 mH/Km
 0 mH/Km

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Power Systems
Pump storage schemes are used to improve

 the diversity factor.
 the load factor.
  the plant capacity factor as well as the load factor of the power system.
 the power factor.

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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)?

  3 × 106 kV / sec.
 3.5 × 106 kV / sec.
 1 × 106 kV / sec.
  2 × 106 kV / sec.

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