Mass Transfer MCQs

Question 1

Pick out the wrong statement pertaining to the analogy between equations of heat and mass transfer operations.

Accepted Answer

Reynolds number in mass transfer is analogous to Grashoff number in heat transfer

Answer

Sherwood number in mass transfer is analogous to Nusselt number in heat transfer

Answer

Prandtl number in heat transfer is analogous to Schmidt number in mass transfer

Answer

Reynolds number remains the same in both heat and mass transfer

Question 2

Co-current absorbers are usually used when the gas to be dissolved in the liquid is

Accepted Answer

Sparingly soluble

Answer

Highly soluble

Answer

A pure substance

Answer

A mixture

Question 3

The overall mass transfer co-efficient for the absorption of SO2 in air with dilute NaOH solution can be increased substantially by

Accepted Answer

Increasing the gas film co-efficient

Answer

Increasing the liquid film co-efficient

Answer

Increasing the total pressure

Answer

Decreasing the total pressure

Question 4

The diffusion co-efficient in m2/s. of acetic acid in benzene (liquid in liquid) is

Accepted Answer

2.09 × 10-4

Answer

2.09 × 10-5

Answer

2.09 × 10-9

Answer

2.09 × 10-12

Question 5

The relative saturation of a partially saturated mixture of vapour and gas can be increased by __________ of the mixture.

Accepted Answer

Both B and C

Answer

Reducing the total pressure

Answer

Increasing the total pressure

Answer

Reducing the temperature

Question 6

Experimental determination of __________ is done by wetted wall column method.

Accepted Answer

Mass transfer co-efficient

Answer

Diffusion co-efficient

Answer

NTU

Answer

None of these

Question 7

Powdery materials can be guarded against caking tendency on storage by

Accepted Answer

None of these

Answer

Providing irregular grain size

Answer

Providing minimum percentage of voids

Answer

Having maximum possible points of contact

Question 8

Measurement of the interfacial area of mass transfer is achieved easily & accurately in case of a __________ coloumn.

Accepted Answer

Wetted wall

Answer

Spray

Answer

Packed

Answer

Bubble cap plate

Question 9

The equilibrium liquid composition compared to the vapor composition in case of azeotropic mixture is

Accepted Answer

Same

Answer

More

Answer

Less

Answer

Either more or less; depends on the system