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Power Systems

Power Systems
Galvanised steel is generally used as

 structural components.
 stray wire.
All of these
 earth wire.

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Power Systems
Most commonly used material for insulator is

 glass
 mica
All of these
 porcelain

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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?

 3.535 pu
 7 pu
 5.353 pu
 5 pu

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Power Systems
Maximum efficiency of modern coal fired steam raising thermal power plants is restricted to about 035 (a low value), mainly because of

 low steam turbine mechanical efficiency.
 low alternative efficiency.
  high energy loss from turbine exhaust to condenser.
 high energy loss in boiler.

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Power Systems
Which of following are the fertile materials

 U233 and Pu239.
 U238 and Pu239.
 U238 and Th239.
  U238 and Th232.

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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?

 290 kHz
 29 kHz
 2.9 kHz
 29 MHz

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