25%
50%
70%
90%
✅ The correct answer is option B.
Chemical Engineering MCQs
For absorbing a sparingly soluble gas in a liquid, the
Gas side co-efficient should be increased
Liquid side coefficient should be increased
Gas side co-efficient should be decreased
Liquid side co-efficient should be decreased
✅ The correct answer is option B.
During bottling of cold drinks (e.g. Pepsi), the main resistance to mass transfer for the absorption of carbon dioxide in water lies in the
Gas film
Liquid film
Liquid-gas interface
None of these
✅ The correct answer is option B.
Binary distillation involves the mass transfer by __________ at the gas-liquid interface.
Unidirectional diffusion from liquid to gas phase
Unidirectional diffusion from gas to liquid phase
Either A or B
A counter diffusion at an almost equal molar rate
✅ The correct answer is option D.
The boiling points of pure components of a binary system __________ with increase in total pressure of the system.
Decreases
Increases
Remains unchanged
May increase or decrease, depends on the system
✅ The correct answer is option B.
The temperature of water cooled in cooling tower is always __________ temperature of entering air.
More than the wet bulb
Less than the wet bulb
Equal to the wet bulb
Equal to the dry bulb
✅ The correct answer is option A.
The operating line for an absorber is curved, when plotted in terms of
Mole fractions
Mole ratios
Partial pressure
Mass fractions
✅ The correct answer is option C.
Which of the following is not fixed by the process requirements, in the design of absorbers?
Flow rate of the entering gas
Composition of the entering liquid
Terminal concentrations of gas stream
None of these
✅ The correct answer is option D.
A 25 cm x 25 cm x 1 cm flat sheet weighing 1.2 kg initially was dried from both sides under constant drying rate conditions. It took 1500 seconds for the weight of the sheet to reduce to 1.05 kg. Another 1m x 1m x 1cm flat sheet of the same material is to be dried from one side only.Under the same constant drying rate conditions, the time required for drying (in seconds) from its initial weight of 19.2 kg to 17.6 kg is
1000
1500
2000
2500
✅ The correct answer is option A.