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Power Systems

Power Systems
Buchholz relay is used for protection of

  transformer.
  alternator.
  none of these.
  bus bar.

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Power Systems
Critical visual voltage is the voltage at which

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

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Power Systems
The amount of ash content in Indian coal

 20 %.
  60 %.
  45 %.
 35 %.

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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?

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

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

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

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Power Systems
A moderator material should have

 may be any of the above.
 large atomic mass.
None of these
  small atomic mass.

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