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Power Systems

Power Systems
Pipes carrying steam are generally of

 aluminium.
  steel.
 cast iron.
 cobalt.

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Power Systems
The conductor of a 10 Km long single phase, two wire line are separated by a distance of 1.5 m the diameter of each conductor the inductance of the circuit is

  23.8 mH.
 25.8 mH.
 23.33 mH.
 21.2 mH.

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Power Systems
If the time of operation of a relay for unity TMS is 10 sec. the time of operation of 0.5 TMS will be _______________ secs.

 20.
  5.
 3.
 7.

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

 ferranti effect
 corona effect
 skin effect
All of these

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Power Systems
In a 3-phase, 5 kV, 5 MVA system, what is the base impedance?

 0.5 ohm
 50 ohms
 500 ohms
 5 ohms

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Power Systems
The characteristic impedance of a transmission on line is

 Inversely proportional to its length.
 Directly proportional to square root of its length.
  Independent of its length.
 Directly proportional to its length.

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