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
Pressure after compression to that before compression
None of these

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Chemical Engineering Basics
The emf of a Deniell cell Zn | Zn²⁺ || Cu²⁺ | Cu can be increased by

Increasing the concentration of zinc sulphate solution
Decreasing the surface area of the electrodes
Increasing the concentration of copper sulphate solution
Increasing the surface area of the electrodes

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