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Chemical Engineering Basics

Chemical Engineering Basics
Laser welding is widely employed in the __________ industries.

Electronic
Structural
Process
Heavy

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Chemical Engineering Basics
Coke is added in the blast furnace to

Increase the fluidity of slag
Reduce & melt the iron ore
None of these
Remove sulphur & phosphorus from molten metal

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Chemical Engineering Basics
A polymer is termed as an 'elastomer', if its percentage elongation is more than 100%. An elastomer is termed as 'rubber' if its percentage elongation is more than __________ percent.

300
200
400
150

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Chemical Engineering Basics
Cold cracking in the heat affected zone of a high strength steel weld can take place because of the

Martensite formation
Relatively high sulphur content in the base metal
Retained austenite
Sufficient hydrogen present in the welding arc

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Chemical Engineering Basics
In a casting, cold shut defect is caused by

Very low mould permeability
Melt-mould reactions
Low pounhg temperature
Faulty gating system

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Chemical Engineering Basics
There are one octahedral void and __________ tetrahedral void in the closest packing of atoms.

Three
Two
None of these
One

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