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Chemical Engineering Basics

Chemical Engineering Basics
Isotropic materials have the same __________ in all directions.

Thermal properties
Density
Induced stresses
Elastic properties

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Chemical Engineering Basics
Principal alloying elements of cast tool alloys which have very high wear resistance & high temperature strength are

Cobalt, zirconium & molybdenum
Cobalt, chromium & tungsten
Molybdenun, tungsten & chromium
Cobalt, chromium & nickel

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Chemical Engineering Basics
Free oxygen is removed from boiler feed water, because it

Reduces heat transfer co-efficient
Is corrosive
None of these
Causes explosion

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Chemical Engineering Basics
In the Bayer's process, bauxite is digested under pressure using

H₂SO₄
NH₃
NaOH
HCl

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Chemical Engineering Basics
The best criterion for analysing an economic investment is the

Present value method
Future value method
Salvage value
Rate of return criterion

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Chemical Engineering Basics
Oxygen cylinders used for autogenous (cutting/welding) purposes are

Heat treated before use
Made by sand casting
Seamless & made of steel
Welded steel cylinders

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