Chemical Engineering Basics
Capacity & power requirement for an air compressor working at high altitude compared to sea-level will be

Either more or less; depends on the climatic conditions
More
Less
Same

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Chemical Engineering Basics
What is the effect on the performance of the economiser in the thermal power plant boiler, if the feed water temperature is very low due to preheaters being out for repairs or starving of steam supply ?

Economiser tube life increases due to handling of low temperature water
Scale formation rate on economiser tubes increases
It results in corrosion due to the condensation on the flue gas side of the economiser tubes due to handling of low temperature water
Heat transfer efficiency of economiser increases due to picking up high heat from the flue gases

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