Increases
Decreases
Remains same
Either A or B, depends on the system
✅ The correct answer is option B.
Chemical Engineering MCQs
Which is the controlling factor for a drum drier?
Diffusion
Heat transfer
Both A & B
Neither A nor B
✅ The correct answer is option B.
Flash distillation is suitable for separating the constituents of a binary system, which
Form minimum boiling azeotrope
Have very wide boiling points
Have very close boiling points
Form constant boiling azeotrope
✅ The correct answer is option B.
Mass transfer co-efficient is directly proportional to DAB according to the __________ theory.
Film
Penetration
Surface-renewal
None of these
✅ The correct answer is option A.
In McCabe-Thiele method, at infinite reflux ratio
The overhead product is minimum
Both the operating lines coincide with diagonal
Both A & B
Neither A nor B
✅ The correct answer is option A.
Lewis number (Le) is
Sc x Pr
Pr x St
Sh x Pr
St x Sh
✅ The correct answer is option A.
The binary diffusivity in gases and liquids vary respectively as
T3/2 and T
T and T3/2
√T and T3/2
T3/2 and √T
✅ The correct answer is option A.
In continuous distillation, the internal reflux ratio (Ri) and the external reflux ratio (Re) are related as
Ri = Re/(1 – Re)
Ri = (1 – Re)/Re
Ri = Re
Ri = Re/(1 + Re)
✅ The correct answer is option D.
Water-ethyl alcohal solution can be concentrated (in respect of alcohal concentration) by __________ distillation.
Atmospheric
Vacuum
High pressure
None of these
✅ The correct answer is option B.
Raoult’s law is applicable to the
Ideal solutions
Real solutions
Mixture of water and alcohol
Non-ideal gases
✅ The correct answer is option A.