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Power Systems

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.
 7.
 3.
  5.

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Power Systems
Which of the following is used in thermal plants

All of these
 Rankine cycle
 Otto cycle
 Joule cycle

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Power Systems
Which of the following matrix is used for load flow studies?

 Y bus matrix
 Unit matrix
 Z bus matrix
 null matrix

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Power Systems
A cable has inductance of 0.22 mH per km and capacitance of 0.202 µF per km. The surge impedance of the cable is

 40 Ω
 52 Ω
 28 Ω
 33 Ω

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Power Systems
Transmission lines are transposed to reduce

 ferranti effect
 skin effect
 proximity effect
 interference with neighbouring communication lines

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Power Systems
Which of the following circuit breakers produce least arc energy?

  Air blast CB.
 Plain oil CB.
 Air break CB.
 Minimum oil CB.

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