Power Systems
What is the function of economiser in steam boilers

All of these
 improving thermal efficiency
 cooling
 collect ash particals

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Power Systems
The skin effect shows that

 current density is lower at the surface of the condutor
 the distribution of AC current is uniform through the cross section of the conductor
 current density is more at the centre of the condutor
 current density is more at the surface of the condutor

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