Chemical Engineering Thermodynamics

Question: A cyclic engine exchanges heat with two reservoirs maintained at 100 and 300°C respectively. The maximum work (in J) that can be obtained from 1000 J of heat extracted from the hot reservoir is [A]. 349 [B]. 651 [C]. 667 [D]. 1000 Answer: Option A Explanation: No answer description available for this question.

Question: As pressure approaches zero, the ratio of fugacity to pressure (f/P) for a gas approaches [A]. zero [B]. unity [C]. infinity [D]. an indeterminate value Answer: Option B Explanation: No answer description available for this question.

Question: At 60° C, vapour pressure of methanol and water are 84.562 kPa and 19.953 kPa respectively. An aqueous solution of methanol at 60° C exerts a pressure of 39.223 kPa; the liquid phase and vapour phase mole fractions of methanol are 0.1686 and 0.5714 respectively. Activity co-efficient of methanol is [A]. 1.572 [B]. 1.9398…

Question: A solid metallic block weighing 5 kg has an initial temperature of 500°C. 40 kg of water initially at 25°C is contained in a perfectly insulated tank. The metallic block is brought into contact with water. Both of them come to equilibrium. Specific heat of block material is 0.4 kJ.kg-1. K-1. Ignoring the effect…

Question: For water at 300°C, it has a vapour pressure 8592.7 kPa and fugacity 6738.9 kPa Under these conditions, one mole of water in liquid phase has a volume of 25.28 cm3 and that in vapour phase in 391.1 cm3.Fugacity of water (in kPa) at 9000 kPa will be [A]. 6738.9 [B]. 6753.5 [C]. 7058.3…

Question: One mole of nitrogen at 8 bar and 600 K is contained in a piston-cylinder arrangement. It is brought to 1 bar isothermally against a resisting pressure of 1 bar. The work done (in Joules) by the gas is [A]. 30554 [B]. 10373 [C]. 4988.4 [D]. 4364.9 Answer: Option B Explanation: No answer description…

Question: For organic compounds, group contribution method can be used for the estimation of [A]. critical properties. [B]. specific gravity. [C]. specific volume. [D]. thermal conductivity. Answer: Option A Explanation: No answer description available for this question.

Question: Air enters an adiabatic compressor at 300K. The exit temperature for a compression ratio of 3, assuming air to be an ideal gas (Y = Cp/Cv = 7/5) and the process to be reversible, is [A]. 300(32/7) [B]. 300(33/5) [C]. 300(333/7) [D]. 300(35/7) Answer: Option A Explanation: No answer description available for this question.

Question: A reasonably general expression for vapour-liquid phase equilibrium at low to moderate pressure is Φi yi P = Yi xi fi° where, Φ is a vapor fugacity component, Yi is the liquid activity co-efficient and fi° is the fugacity of the pure component i. the Ki value (Yi = Ki xi) is therefore, in…

Question: On a P-V diagram of an ideal gas, suppose a reversible adiabatic line intersects a reversible isothermal line at point A. Then at a point A, the slope of the reversible adiabatic line (∂P/∂V)s and the slope of the reversible isothermal line (∂P/∂V)T are related as (where, y = Cp/Cv) [A]. (∂P/∂V)S = (∂P/∂V)T…