Power Systems
To protect the power transformer ( Y-Y with neutral grounded) against fault, which type of connection do the current transformers have?

 Δ-Y connection
 Δ-Δ connection
 Y-Y connection
 Y-Δ connection

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

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

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