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Power Systems

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

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

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Power Systems
String chart is drawn between

 temperature (T) on X- axis, sag(S) and tension (T) on Y-axis
 nether 1 nor 2
 T on Y-axis and S and T on on X-axis
 both 1 and 2

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Power Systems
If the breakdown voltage of the insulator is high, the thickness of the insulator is

None of these
 high
 it does not related to breakdown voltage
 less

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Power Systems
To reduce the radio interference which line is/are transposed?

 either 1 or 2
None of these
 Both power and telecommunication lines
 Power line

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Power Systems
Example of base load stations are

  thermal.
  hydro.
  both A and B.
  gas turbine.

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Power Systems
The pu parameters for a 500 MVA machine on its own base are: Inertia, H = 20 pu; reactance X = 2 pu. The pu values of inertia and reactance on 100 MVA common base, respectively, are

 4, 10
 100, 10
 100, 0.4
 4, 0.4

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