Chemical Engineering Thermodynamics
Critical solution temperature (or the con-solute temperature) for partially miscible liquids (e.g., phenol-water) is the minimum temperature at which

None of these
Two liquids are completely separated into two layers
Mutual solubility of the two liquids shows a decreasing trend
A homogeneous solution (say of phenol water) is formed

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Chemical Engineering Thermodynamics
A refrigeration cycle is a reversed heat engine. Which of the following has the maximum value of the co-efficient of performance (COP) for a given refrigeration effect?

Carnot refrigeration cycle
Vapor compression cycle using expansion valve
Vapor compression cycle using expansion engine
Air refrigeration cycle

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