Mass Transfer - Practice Test

[#526] The Kundsen diffusivity is proportional to (where, T = absolute temperature)

(A) $$sqrt { ext{T}} $$

(B) T 2

(C) T

(D) T 4

Correct Answer

(A) $$sqrt { ext{T}} $$

[#527] Pick out the wrong statement pertaining to the rotary dryer.

(A) 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

(B) 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

(C) Rotary dryer is suitable for drying sticky material

(D) Recommended peripherial speed of a rotary drier is in the range of 10 to 30 metres/minute

Correct Answer

(C) Rotary dryer is suitable for drying sticky material

[#528] To remove all the moisture from a wet solid it requires exposure to __________ air.

(A) Perfectly dry

(B) Highly humid

(C) High temperature

(D) None of these

Correct Answer

(A) Perfectly dry

[#529] Which of the following processes is not an example of adsorption applied to gaseous separations?

(A) Recovery of valuable solvent vapors from dilute mixture with air and other gases

(B) Dehumidification of air and gas

(C) Removal of objectionable odour and impurities from industrial gases

(D) Decolouration of yellow glycerene

Correct Answer

(D) Decolouration of yellow glycerene

[#530] If f is defined as above, then which of the following applies to a feed at dew point?

(A) F = 1

(B) F < 1

(C) F > 1

(D) 0 < f < 1

Correct Answer

(A) F = 1

Mass Transfer - Study Mode

[#526] The Kundsen diffusivity is proportional to (where, T = absolute temperature)

Correct Answer

[#527] Pick out the wrong statement pertaining to the rotary dryer.

Correct Answer

[#528] To remove all the moisture from a wet solid it requires exposure to __________ air.

Correct Answer

[#529] Which of the following processes is not an example of adsorption applied to gaseous separations?

Correct Answer

[#530] If f is defined as above, then which of the following applies to a feed at dew point?

Correct Answer