Chemical Engineering Mcqs

Danckwerts developed the ____________________ theory?

• (A)  Penetration
• (B)  Surface renewal
• (C)  Film
• (D)  None of these

Answer

Submitted By :Ali Uppal

Leaching of coarse solid lumps is also termed as _____________________?

• (A)  Decoction
• (B)  Dissolution
• (C)  Percolation
• (D)  Agitation and settling

Answer

Submitted By :Ali Uppal

Steam distillation is used to__________________?

• (A)  Reduce the number of plates
• (B)  Avoid thermal decomposition of a component
• (C)  Increase the efficiency of separation
• (D)  Increase the total pressure of distillation

Answer

Submitted By :Ali Uppal

Which of the following can be calculated theoretically using steam table and Dalton’s law of partial pressure; if the relative humidity and dry bulb temperature of moist air is known ?

• (A)  Dew point
• (B)  Humidity ratio
• (C)  Wet bulb temperature
• (D)  None of these

Answer

Submitted By :Ali Uppal

In a vapor-liquid contacting equipment, the overall gas phase mass transfer co-efficient (M.T.C), KG is related to individual co-efficients (KG and KL) as ___________________ ?

• (A)  KG = 1/KG + m/KL
• (B)  1/KG = 1/KG + m/KL
• (C)  1/KG = 1/KL + m/KG
• (D)  KG = 1/KL + m/KG

Answer

Submitted By :Ali Uppal

Rayleigh equation applies to _________________ distillation ?

• (A)  Differential
• (B)  Flash
• (C)  Equilibrium
• (D)  Molecular

Answer

Submitted By :Ali Uppal

What is the degree of freedom of an absorption process in which only one component is transferred between phases ?

• (A)  1
• (B)  2
• (C)  3
• (D)  4

Answer

Submitted By :Ali Uppal

Polar organic compounds are normally used as separating agents for the azeotropic and extractive distillation. Which of the following is the most important factor to be considered for the choice of the separating agent for extractive distillation ?

• (A)  Cost
• (B)  Availability
• (C)  Toxicity
• (D)  Selectivity

Answer

Submitted By :Ali Uppal

Raoult’s law does not apply, when the___________________?

• (A)  Size of component molecules are not equal
• (B)  Attractive forces between like and unlike molecules in the solution are approximately equal
• (C)  Component molecules are non-polar
• (D)  Chemical combination or molecular association between unlike molecules takes place in the formation of solution

Answer

Submitted By :Ali Uppal

In most of the mechanically agitated liquid-liquid extractors, baffles or horizontal compartmental plates are provided, which helps in_________________?

• (A)  Reducing the axial mixing
• (B)  Increasing the rate of extraction
• (C)  Maintaining the concentration difference between the two phases
• (D)  All A , B & C.

Answer

Submitted By :Ali Uppal