Chemical Engineering Basics
The size of the tetrahedral void in the closest packing of atoms is __________ that of the octahedral void.

Less than
Equal to
Either A, B or C; depends on the size of atom
Greater than

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

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