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Power Systems

Power Systems
Ferranti effect occurs under

 full load
 half load
 no load
 any of the above

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Power Systems
Two identical synchronous machines having same inertia constant are connected in parallel and swinging together. The effective inertia constant is 4 MJ/MVA. Then each machine has inertia constant of

 4 MJ/MVA
 8 MJ/MVA
 2 MJ/MVA
 16 MJ/MVA

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

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

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Power Systems
Mho relay is used for protection of

  none of these.
  short lines.
  medium lines.
  long lines.

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Power Systems
In which of the following configuration power transferability is higher?

 horizontal configuration
 same in both configuration
None of these
 triangular configuration

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Power Systems
A transmission line has a surge impedance of 400 Ω is connected with the cable having surge impedance of 40 Ω, a surge magnitude of 100 kV is travelling from the transmission line towards the cable. Find the incident current?

 200 A
 2500 A
 250 A
 100 A

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