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Power Systems

Power Systems
Percentage of carbon is highest in

  bituminous coal.
  anthracite coal.
  coal gas.
  lignite coal.

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Power Systems
An over current relay, having a current setting of 125% connected to a supply circuit through a current transformer of ratio 500/5. The plug setting multiplier for a fault current of 5 kA is

 8
 5
 6
 2

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Power Systems
The per unit value of a 2 ohm resistor at 100 MVA and 10 kV base voltage is

 2 pu
 4 pu
 0.2 pu
 0.5 pu

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Power Systems
The positive, negative and zero sequence per unit impedance of two generators connected in parallel are X1 = 0.12 pu, X2 = 0.096 pu and X0 = 0.036 pu. For LG fault at generator terminals (with 1 pu voltage) the positive sequence current will be

 10.936 pu
 9.936 pu
 7.936 pu
 8.936 pu

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Power Systems
Which of the following effects are associated with transmission line

 corona effect
 skin effect
All of these
 ferranti effect

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Power Systems
Which of the following is/are the methods of improving transient stability?

 Dynamic breaking
 Fast acting governing system
All of these
 Fast acting excitation control

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