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Power Systems

Power Systems
A 3 layer, total diameter of an ACSR conductor is 5 cm. Find the diameter of each strand?

 1 cm
 1.5 cm
 5 cm
 15 cm

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Power Systems
A CT is connected in ___________________ with the line.

  across.
  series.
  both A and B.
  not connected.

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Power Systems
A string insulator has 4 units. The voltage across the bottom most unit is 33.33% of total voltage. Its string efficiency is

 66.66%
 25%
 75%
 33.33%

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Power Systems
A transmission line has (2 + j4)Ω impedance, 100 MVA and base voltage is 10 KV. Find the per unit impedance value of transmission line?

 (1 + j2 ) pu
 (2 + j4 ) pu
 (0.5 + j1 ) pu
 (4 + j8 ) pu

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Power Systems
When a transformer is loaded, the secondary terminal voltage gains. That means power factor is

  leading.
 zero.
 unity.
 lagging.

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Power Systems
For n bus power system size of Y bus matrix is

 (n-2)×(n-2)
 n×n
 (n-1)×(n-2)
 (n-1)×(n-1)

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