Chemical Engineering Basics
Two wires of the same radius & material having length in the ratio of 1 : 2 are stretched by the same force. The strain produced in the two wires will be in the ratio of

0.044444444444444
0.042361111111111
0.043055555555556
0.084027777777778

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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 ?

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
Economiser tube life increases 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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