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

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

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

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

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