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Power Systems

Power Systems
Corona loss is ----------------- on hilly areas than as plain areas.

 less
 remain same
None of these
 more

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Power Systems
In an induction relay for a particular current setting the operating time 4 sec. When the time multiplier setting is 0.8 if the time multiplier setting is rest to 1 the operating time is

 5.
  un changed.
  1.
 10.

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Power Systems
Four identical alternators each are rated for 20 MVA, 11 KV having a subtransient reactance of 16% are working in parallel. The short circuit level at the busbar is

 125 MVA
 100 MVA
 500 MVA
 400 MVA

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Power Systems
The surge impedance of a 400 km long overhead transmission line is 420 Ω. For a 200 km length of the same line, the surge impedance will be

 400 Ω
 840 Ω
 210 Ω
 420 Ω

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Power Systems
The arc voltage produced in an AC circuit breaker is always

 in phase opposition with the arc current.
 leading the arc current by 90°.
 lagging the arc current by 90°.
  in phase with the arc current.

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Power Systems
Deflectors are provided in

 Kaplan turbine.
 propeller turbine.
  Pelton wheel.
 Francis turbine.

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