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Chemical Engineering Basics

Chemical Engineering Basics
Grain hardness is measured by the __________ hardness testing method.

Rockwell F
Shore sceleroscope
Knoop
Vicker's

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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.

150
400
300
200

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Chemical Engineering Basics
Ignition of fuel in a diesel engine is by

Spark
None of these
Hot compressed air
Fuel injection

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

Aluminium
Soft solder
Brazing spelter
Silver solder

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Chemical Engineering Basics
Sub zero treatment of steel is done to

Induce temper brittleness after its hardening
Reduce the retained austenite in hardened steel
Enhance its working performance in sub zero atmosphere
Suppress martensite transformation

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Chemical Engineering Basics
Silicon crystal can be converted to p-type semi-conductor by doping with

Boron
Phosphorous
Carbon
Nitrogen

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