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Power Systems

Power Systems
If the time of operation of a relay for unity TMS is 10 sec. the time of operation of 0.5 TMS will be _______________ secs.

 20.
 7.
 3.
  5.

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Power Systems
Operating cost of thermal power station is

 less than that of hydroelectric power plant.
 less than that of nuclear power plant.
 is the same as that of nuclear power plant.
  less than that of diesel power plant.

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Power Systems
Resistance switching in normally employed in

 minimum oil breakers.
 bulk oil breakers.
  air blast circuit breaker.
 all breakers.

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Power Systems
A 100 MVA alternator operating at full load at 50 Hz. H = 4 MWsec/MVA, Td = 0.5 sec. One of the transmission line is tripped. So that output of generator is reduced to 70 MW. Find the frequency deviation during this time?

 -0.56
 0.56
 0.92
 -0.92

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Power Systems
Corona is accompanied by

 power loss and interference
 hissing sound
All of these
 violet visible light

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Power Systems
A loss less transmission line has a length of 600 km, find the phase shift of voltage signal?

 45°
 36°
 90°
 42°

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