Power Systems
The most suitable circuit breaker for short line fault without switching resistor is

  SF6 breaker.
 air blast circuit breaker.
 oil circuit breaker.
 none of these.

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Power Systems
In coal fired thermal power stations, what are the electrostatic precipitators used for?

All of these
 To remove dust particles setting on the bus bar conductors in the station switch yard
 To keep the air heaters clean
 To collect the dust particles from the flue gases

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