√T
T²
T
T⁴
✅ The correct answer is option A.
Chemical Engineering MCQs
Pick out the wrong statement pertaining to the rotary dryer.
Flights (located in the inside shell of rotary dryer) lift the material being dried and shower it down through the current of hot air/gases. It extends from the wall to a distance which is about 8-12%
Hold up of a rotary drier is defined as the fraction of the dryer volume occupied by the solid at any instant. The best performance for rotary drier is obtained, when the hold up is in the range of 0.
Rotary dryer is suitable for drying sticky material
Recommended peripherial speed of a rotary drier is in the range of 10 to 30 metres/minute
✅ The correct answer is option C.
Fractional solvent extraction
Employs only one solvent
Employs two solvents
Results in low interfacial tension
None of these
✅ The correct answer is option B.
Steam distillation is used to separate
Azeotropes
High boiling substances from nonvolatile impurities
Heat sensitive materials
Mixtures of low relative volatility
✅ The correct answer is option B.
Which of the following is considered equivalent to one theoretical stage in Mc-Cabe Thiele’s method?
Partial condenser
Total condenser
Reboiler
Both B and C
✅ The correct answer is option D.
The most common packing used in industrial operations is __________ rings.
Raschig
Lessing
Cross-partition
Single spiral
✅ The correct answer is option A.
Steam distillation is not recommended to be used, if the
Azeotropic mixture is to be separated and the final product is miscible with water
Liquids decompose, if distilled directly at atmospheric pressure
Material can not be distilled by indirect heating even under low pressure, because of the high boiling temperature
Material to be distilled is thermally unstable or has the tendency to react with other components associated with it, at the boiling temperature
✅ The correct answer is option A.
The slope of the operating line for a single component co-current absorber when plotted in terms of mole ratio units is
0
∞
#REF!
#REF!
✅ The correct answer is option C.
Wetted wall tower experiment determines the
Molal diffusivity
Volumetric co-efficient
Mass transfer co-efficient
None of these
✅ The correct answer is option C.
Which of the following psychrometric processes is followed by water vapour laden unsaturated air, when it is passed through solid or liquid adsorbent?
Cooling and dehumidification
Heating and dehumidification at almost constant wet bulb temperature
Dehumidification with dry bulb temperature remaining constant
None of these
✅ The correct answer is option B.