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Power Systems

Power Systems
In a 4 bus,4×4 Y bus matrix the number of non zero elements are 12. Find the number of transmission lines?

 8
 4
 5
 2

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Power Systems
A 3-phase breaker is rated at 2000 MVA, 33 kV, its making current will be

 70 kVA.
  89.22 kVA.
 49 kVA.
  35 kVA.

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Power Systems
Critical visual voltage is the voltage at which

 both 1 and 2
 corona is visible with blue or violet colour
 corona is just initiated
None of these

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Power Systems
A 10 MVA generator has reactance of 0.2 pu. Find the new reactance value for 50 MVA base?

 0.25 pu
 1 pu
 5 pu
 0.2 pu

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Power Systems
Mho relay is usually employed for protection of

 medium transmission lines only
 short transmission lines only
 long transmission lines only
 any line

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Power Systems
Which of following generating plants has the minimum operating cost

 Steam plant.
 Hydroelectric plant.
 Diesel plant.
 Nuclear plant.

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