Questions and answers for exam Preparation

MCQs

Total Questions : 3241 | Page 317 of 325 pages

Question 3161. The rate of mass transfer is not dependent upon the______________________?

Degree of dispersion of one fluid in the other
Interfacial surface exposed between the phases
Both A. & B.
None of these

Discuss Question

Answer: Option D. -> None of these
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 3162. Gaseous diffusion co-efficient increases with increase in the_____________________?

Pressure
Temperature
Both A. & B.
Neither A. nor B.

Discuss Question

Answer: Option B. -> Temperature
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 3163. One mole feed of a binary mixture of a given composition is flash vaporised at a fixed P and T. If Raoult’s law is obeyed, then changing the feed composition would effect ?

The product composition but not the fraction vaporised
The product composition as well as the fraction vaporised
The fraction vaporised but not the product composition
Neither the product composition nor the fraction vaporised

Discuss Question

Answer: Option C. -> The fraction vaporised but not the product composition
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 3164. The rate of solid-liquid extraction is limited by the_________________?

Phase change of the solute as it dissolves in the solvent
Diffusion of the solute through the solvent in the pores to the outside of the particle
Diffusion of the solute from the solution in contact with the particle to the main bulk of the solution
All A , B. & C.

Discuss Question

Answer: Option D. -> All A , B. & C.
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 3165. The operating line for an absorber is curved, when plotted in terms of _______________________?

Mole fractions
Mole ratios
Partial pressure
Mass fractions

Discuss Question

Answer: Option C. -> Partial pressure
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 3166. Make up water is supplied during cooling tower operation to compensate for water losses due to______________________?

Evaporation
Blowdown
Entrainment
All A., B. & C.

Discuss Question

Answer: Option D. -> All A., B. & C.
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 3167. An ideal tower packing should not _______________________?

Have low weight per unit volume
Have large surface area per unit volume
Have large free cross-section
Hold up large amount of liquid in the packing

Discuss Question

Answer: Option D. -> Hold up large amount of liquid in the packing
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 3168. (NSh/NRe.NSc) is termed in mass transfer operation as the __________________________?

Stanton number
Peclet number
Thermal diffusivity
Momentum diffusivity

Discuss Question

Answer: Option A. -> Stanton number
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 3169. Positive deviation from Raoult’s law means a mixture whose total pressure is___________________?

Greater than that computed for ideality
Less than that computed for ideality
Less than the sum of the vapour pressure of the components
None of these

Discuss Question

Answer: Option A. -> Greater than that computed for ideality
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 3170. Fenske-Underwood equation used for calculating the minimum number of theoretical plates in distillation column is valid for_________________?