Chemical Engineering Basics
Sub zero treatment of steel is done to

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

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Chemical Engineering Basics
Compression ratio of an I.C. engine is the ratio of the

None of these
Volume of air in cylinder before compression to that after compression
Pressure after compression to that before compression
Clearance volume to the volume swept by piston per stroke

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