Chemical Engineering Mcqs

All gases during throttling process at atmospheric temperature and pressure show a cooling effect except__________________?

• (A)  CO2
• (B)  H2
• (C)  O2
• (D)  N2

Answer

Submitted By :Ali Uppal

Compressibility factor-reduced pressure plot on reduced co-ordinates facilitates__________________?

• (A)  Use of only one graph for all gases
• (B)  Covering of wide range
• (C)  Easier plotting
• (D)  More accurate plotting

Answer

Submitted By :Ali Uppal

At equilibrium condition, the chemical potential of a material in different phases in contact with each other is equal. The chemical potential for a real gas (μ) is given by (where, μ = standard chemical potential at unit fugacity (f° = 1 atm.) and the gas behaves ideally.) ?

• (A)  μ° + RT ln f
• (B)  μ°+ R ln f
• (C)  μ° + T ln f
• (D)  μ° + R/T ln f

Answer

Submitted By :Ali Uppal

Charles’ law for gases states that__________________?

• (A)  V/T = Constant
• (B)  V ∝ 1/T
• (C)  V ∝ 1/P
• (D)  PV/T = Constant

Answer

Submitted By :Ali Uppal

The co-efficient of performance (COP) of a refrigerating system, which is its index of performance, is defined as the ratio of useful refrigeration to the net work. The units of _____________ and COP are the same?

• (A)  Kinematic viscosity
• (B)  Work
• (C)  Temperature
• (D)  None of these

Answer

Submitted By :Ali Uppal

Dryness fraction of wet steam is defined as the ratio of mass of vapour in the mixture to the mass of mixture ______________ calorimeter is not used for measuring the dryness fraction of steam?

• (A)  Bomb
• (B)  Separating
• (C)  Bucket
• (D)  Throttling

Answer

Submitted By :Ali Uppal

Specific volume of an ideal gas is____________________?

• (A)  Equal to its density
• (B)  The reciprocal of its density
• (C)  Proportional to pressure
• (D)  None of these

Answer

Submitted By :Ali Uppal

The point at which all the three (solid, liquid and gas) phases co-exist, is known as the ____________ point?

• (A)  Freezing
• (B)  Triple
• (C)  Boiling
• (D)  Boyle

Answer

Submitted By :Ali Uppal

Which of the following has the least thermal efficiency ?

• (A)  Steam engine
• (B)  Carnot engine
• (C)  Diesel engine
• (D)  Otto engine

Answer

Submitted By :Ali Uppal

Solubility of a substance which dissolves with an increase in volume and liberation of heat will be favoured by the_______________?

• (A)  Low pressure and high temperature
• (B)  Low pressure and low temperature
• (C)  High pressure and low temperature
• (D)  High pressure and high temperature

Answer

Submitted By :Ali Uppal