Chemical Engineering Basics
In extrusion of metals, which of the following statement is true ?

Redundant work is a function of the die angle
Hollow ram is used for indirect extrusion
Relative motion between the billet surface and the container wall is always present
Speed of the extruded material is same as that of ram speed

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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 ?

It results in corrosion due to the condensation on the flue gas side of the economiser tubes due to handling of low temperature water
Scale formation rate on economiser tubes increases
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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