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

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

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Chemical Engineering Basics
In extrusion of metals, which of the following statement is true ?

Speed of the extruded material is same as that of ram speed
Redundant work is a function of the die angle
Relative motion between the billet surface and the container wall is always present
Hollow ram is used for indirect extrusion

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