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Power Systems

Power Systems
In thermal plant most of the energy is wasted in

 boiler
 condenser
 ESP
 turbines

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Power Systems
The total number of strands(N) is concentrically stranded cable with total annular space filled with strands of uniform diameter is given by (if x is number of layers)

 N = 3x²+3x+1
 N = 3x²-6x+1
 N = 3x²-3x+1
 N = 3x²-2x+1

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

 1 cm
 5 cm
 1.5 cm
 15 cm

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Power Systems
Alternate formation and breakage of bubbles are called

  water hamming.
All of these
  surgfication.
  cavitations.

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Power Systems
Which of the following statements is/are true regarding HVDC?

 There is no skin effect in dc line
All of these
 Corona loss is very much reduced in the dc line
 HVDC can utilize earth for its return path

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Power Systems
What type of back up protection is used for alternators?

  Impedance relay.
  IDMT relay.
  Mho relay.
  Buchholz relay.

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