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Chemical Engineering Basics

Chemical Engineering Basics
Lime contains about 90% CaO. Percentage CaO present in limestone is about

70
50
80
25

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Chemical Engineering Basics
Filler material used in welding having the lowest melting point out of the following is

Silver solder
Aluminium
Brazing spelter
Soft solder

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Chemical Engineering Basics
Unit of viscosity in CGS system is

Gm .cm⁻², sec⁻¹
Gm . cm² . sec⁻²
Gm .cm⁻¹ sec⁻¹
Gm . cm . sec⁻¹

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Chemical Engineering Basics
Toughness of a material is measured by the

Notched bar test
Universal testing machine
Vicker's hardness test
Scratch test

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Chemical Engineering Basics
In "Imperial Smelting Process" for extraction of zinc, zinc vapour thus produced is quenched in the external condenser by the use of the following :

Mixture of water and air
Rain of molten lead
Blast of air
Jet of water at high pressure

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

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

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