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Power Systems

Power Systems
Which of the following material is not used as fuse element?

  Aluminium.
  Silver.
  Copper.
  Carbon.

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Power Systems
If all the sequence voltages at the fault point in a power system are equal, then the fault point is a

 LG
 LL
 LLL
 LLG

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Power Systems
The use of high speed circuit breakers

 increased the short circuit current.
 decrease system stability.
  improves system stability.
 reduces the short circuit current.

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Power Systems
Pipes carrying steam are generally of

 cobalt.
  steel.
 cast iron.
 aluminium.

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Power Systems
Attenuation occurs due to

 conductance
 both 1 and 3
 inductance
 resistance

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

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