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

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

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Power Systems
The advantage of hydro electric power station over thermal power station is

 the initial cost of hydro electric power station is low
 hydro electric power station can supply the power throughout the year
 hydro electric station can be constructed at the place where the energy is required
 the operation cost of hydro electric power station is low

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