Power Systems
Which of the following is/are the advantages of synchronous phase modifier over the shunt compensation?

 initial cost is low
 single unit can be used as both capacitance and inductor by adjusting the excitation
 smooth voltage regulation is possible by controlling excitation
 both 1 and 2

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

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

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

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