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Power Systems

Power Systems
Range of accelerating factor is

 1.6 to 1.8
 1 to 10
 50 to 100
 10.8 to 11.2

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Power Systems
Mho relay is used for the protection of

 short length lines.
 medium length lines.
  long transmission lines.
 no length criterion.

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Power Systems
Which of the following contributes to the Rankine cycle efficiency improvement in a thermal power plant

 Reheat of steam an intermediate stages.
All of these
 Use of high pressure.
 Use of steam for heating of boiler feed water.

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Power Systems
In which of the following given faults, all the sequence currents are equal?

 LL
 LLL
 LG
 LLG

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Power Systems
a 50 Hz, 3-phase synchronous generator has inductance per phase of 15 mH. The capacitance of the generator and circuit breaker is 0.002 µF. What is its natural frequency?

 29 MHz
 2.9 kHz
 290 kHz
 29 kHz

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Power Systems
In thermal plant most of the energy is wasted in

 condenser
 boiler
 ESP
 turbines

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