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Power Systems

Power Systems
Buchholz relay is used for protection of

  bus bar.
  alternator.
  transformer.
  none of these.

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Power Systems
Which following statement are not true for line parameters R, L, G and C of transmission line

 LC = μ ε and RG = σ ε.
 All of above.
 Both R and G depend on the conductivity of conductor forming the line.
 G = 1/R where G is conductance of line.

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Power Systems
The ABCD constants of a 3-phase transmission line are A = D = 0.8∠1°, B = 170∠85° Ω , C = 0.002∠90.4° â„§. The sending end voltage is 400 kV. The receiving end voltage under no load condition is

 400 kV
 600 kV
 350 kV
 500 kV

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Power Systems
A 100 Km long transmission line is loaded at 110 kV. If the loss of line is 5 MW and the load is 150 VA the resistance of the line is

  8.06 Ω / phase.
 4.65 Ω / phase.
 2.26 Ω / phase.
 6.06 Ω / phase.

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Power Systems
Hydro-graph is similar to

  load curve.
 both B and C.
 energy load curve.
 mass curve.

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Power Systems
In a regenerative cycle, feed water is heated by

  drained steam from turbine.
 exhaust gas.
 all of above.
 heaters.

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