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Power Systems

Power Systems
Which of the following is used in thermal plants

 Otto cycle
All of these
 Joule cycle
 Rankine cycle

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Power Systems
On what factor does the performance of a circuit breaker depend?

  Both A and C.
  None of these.
  Breaking speed.
 Critical length of breaking.

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Power Systems
For large plants of capacity for more than 15 MW, what type of cooling is used

  Liquid.
  Water.
  Hydrogen.
  Air.

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Power Systems
Power transmission lines are transposed to reduce

 radio interference
 proximity effect
 ferranti effect
 skin effect

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Power Systems
A transmission line has self and mutual impedances are 0.8 and 0 pu respectively. Find the positive, negative and zero sequence impedances respectively?

 0.6, 0.6 and 1.2 pu
 0.8, 0.8 and 0.8 pu
 0.6, 0.8 and 1.2 pu
 0.6, 0.6 and 0.6 pu

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Power Systems
The time taken by the turbine to fall to 0 rpm speed from 3000 rpm is called

  stopping time.
  damping time.
  settling time.
  coasting time.

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