Chemical Engineering Basics
The stress at which a metal fails by fatigue lies

None of these
Near the fracture point of the stress-strain curve
In the elastic range
In the plastic range

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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 ?

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
Economiser tube life increases due to handling of low temperature water
Scale formation rate on economiser tubes increases

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