Chemical Engineering Mcqs

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)

Submitted By :Ali Uppal

A reasonably general expression for vapour-liquid phase equilibrium at low to moderate pressure is φi yi P = Yi xifi° where, Φ is a vapor fugacity component, Yi is the liquid activity coefficient and fi° is the fugacity of the pure component i. the Ki value (Yi = Ki xi) is therefore, in general a function of ______________________?

(A) Temperature only
(B) Temperature and pressure only
(C) Temperature, pressure and liquid composition xi only
(D) Temperature, pressure, liquid composition xi and vapour composition yi

Submitted By :Ali Uppal

Gibbs-Duhem equation relates composition in liquid phase and the _____________ at constant temperature & pressure?

(A) Fugacity
(B) Partial pressure
(C) Activity co-efficient
(D) All (A), (B), and (C)

Submitted By :Ali Uppal

Critical temperature is defined as the temperature above which a gas will____________________?

(A) Not liquify (barring exceptions)
(B) Immediately liquify
(C) Never liquify however high the pressure may be
(D) None of these

Submitted By :Ali Uppal

The expression for entropy change given by, ΔS = nR ln (V2/V1) + nCv ln (T2/T1) is valid for ______________________?

(A) Reversible isothermal volume change
(B) Heating of a substance
(C) Cooling of a substance
(D) Simultaneous heating and expansion of an ideal gas

Submitted By :Ali Uppal

With increase in reduced temperature, the fugacity co-efficient of a gas at constant reduced pressure___________________?

(A) Increases
(B) Decreases
(C) Remain same
(D) Decreases linearly

Submitted By :Ali Uppal

Which of the following is not a reversible process ?

(A) Expansion of an ideal gas against constant pressure
(B) Atmospheric pressure vaporisation of water at 100°C
(C) Solution of NaCl in water at 50°C
(D) None of these

Submitted By :Ali Uppal

Equilibrium constant of a reaction varies with the____________________?

(A) Initial concentration of the reactant
(B) Pressure
(C) Temperature
(D) None of these

Submitted By :Ali Uppal

For a cyclic process, a fixed ratio between heat and work___________________?

(A) Always exists
(B) May exist
(C) Never exists
(D) Is difficult to predict

Submitted By :Ali Uppal

When dilute aqueous solutions of two salts are mixed, the process is associated with ___________________?

(A) Decrease in temperature
(B) Increase in temperature
(C) No change in temperature
(D) Change in temperature which is a function of composition

Submitted By :Ali Uppal

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