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Power Systems

Power Systems
Galvanised steel is generally used as

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

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Power Systems
For 800 MJ stored energy in the rotor at synchronous speed, what is the inertia constant H for a 50 Hz, four pole turbo generator rated 100 MVA, 11 kV?

 4 MJ/MVA
 6 MJ/MVA
 2 MJ/MVA
 8 MJ/MVA

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Power Systems
A fuse wire of circular cross-section has a radius of 0.8 mm. The wire blows off at an current of 8 Amp. Calculate the radius of wire that will blow off at an current of 1 amp?

 2 mm.
 0.4 mm.
 4 mm.
  0.2 mm.

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Power Systems
A three phase, 33 kV oil circuit breaker is rated 1200 A, 2000 MVA, 3 secs. The symmetrical breaking current is

 55 kA.
  35 kA.
 50 kA.
 45 kA.

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Power Systems
Binary vapor cycle are used for

  improving the condenser performance.
  improving the plant efficiency.
All of these
  increasing the turbine efficiency.

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Power Systems
Most commonly used material for insulator is

 glass
 mica
 porcelain
All of these

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