Chemical Engineering Thermodynamics
Compressibility factor-reduced pressure plot on reduced co-ordinates facilitates

Use of only one graph for all gases
Covering of wide range
More accurate plotting
Easier plotting

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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?

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

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Chemical Engineering Thermodynamics
Steam undergoes isentropic expansion in a turbine from 5000 kPa and 400°C (entropy = 6.65 kJ/kg K) to 150 kPa) (entropy of saturated liquid = 1.4336 kJ/kg . K, entropy of saturated vapour = 7.2234 kJ/kg. K) The exit condition of steam is

Partially condensed vapour with quality of 0.1
Partially condensed vapour with quality of 0.9
Superheated vapour
Saturated vapour

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