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Chemical Engineering - Mass Transfer

Exercise : Mass Transfer - Section 2
11.
Agitator is provided in a crystalliser for
avoiding deposition on cooler surfaces.
formation of nuclei.
crystal growth.
all (a), (b) and (c).
Answer: Option
Explanation:
No answer description is available. Let's discuss.
12.
__________ diffusion is used for separating the isotopes of methane.
Thermal
Pressure
Concentration
Force
Answer: Option
Explanation:
No answer description is available. Let's discuss.
13.
Ordinary diffusion process is also called __________ diffusion.
pressure
thermal
concentration
forced.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
14.
Pick out the wrong statement.
Different solids have different equilibrium moisture curves.
Total condenser or reboiler is considered equivalent to one theoretical plate in McCabe-Thiele method of theoretical plate calculation for distillation column.
Heat removal load on cooler remains constant, even with increase of the reflux ratio in a distillation column.
Even a forced draft cooling tower can not cool water below the wet bulb temperature.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
15.
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% of the inside diameter of shell.
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 0.05 to 0.15.
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.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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