Power Systems
Plug setting of a relay can be altered by varying

 adjustable back up stop.
 air gap of magnetic path.
 no. of ampere-turns.
 none of these.

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Power Systems
Per unit of any quantity is defined as

 actual value of quantity /base value of quantity in same units
 actual value of quantity /base value of quantity in different units
 base value of quantity /actual value of quantity in different units
 base value of quantity /actual value of quantity in same units

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

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

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