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Mass Transfer

Free 697+ Mass Transfer MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Practise below with answers and explanations.

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Mass Transfer — MCQs for Pakistan government job tests

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Mass Transfer

Practice questions

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1.Identify the incorrect statement from the following:

2.What is the temperature called at which a gas-vapor mixture reaches saturation upon cooling at constant total pressure without contacting any liquid?

3.What is the consequence of a large pressure drop in absorbers?

4.What is the typical order of magnitude for binary diffusivity in gases under atmospheric pressure?

5.How does the formation of 'case hardening' in a high moisture solid cake impact the drying rate?

6.Which type of dryer is commonly used for drying refractory bricks?

7.Which type of rings is most frequently utilized as packing material in industrial processes?

8.What factor primarily influences the capacity of a rotary dryer?

9.For which environment is a carbon Berl saddle unsuitable?

10.To ensure a fast drying rate in a spray drying process, what should be the particle size range (in microns) of the feed material? (Note: 1 mm = 1000 microns)

11.Given that G represents an insoluble gas in the gas phase and L denotes a non-volatile solvent in the liquid phase, what is the slope of the operating line in an absorption process?

12.In mass transfer, which dimensionless number is analogous to the Prandtl number used in heat transfer?

13.What type of process is physical absorption?

14.The ion exchange method closely resembles which of the following processes?

15.Why does a small quantity of water evaporation result in significant cooling?

16.What happens to the number of theoretical stages when the reflux ratio is reduced?

17.How does the dew point change for an unsaturated air-water vapor mixture at constant pressure and temperature when the absolute humidity rises?

18.What is the term for the amount of heat in BTUs required to raise the temperature of 1 pound of gas and its vapor by 1°F?

19.In which of the following processes is the Lewis number particularly important?

20.In a distillation column, when is the least number of theoretical plates needed to accomplish a specified separation?

How to prepare with Mass Transfer MCQs

  • Work through questions topic by topic, then revisit any you answered incorrectly.
  • Read explanations carefully—they often cover facts that repeat across PPSC, FPSC, and NTS papers.
  • Pair subject practice with past papers to see how Mass Transfer appears in real exam conditions.

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