Mass Transfer Practice Test 9

1. Find the process

2. The moisture in the solid after attaining equilibrium is known as

3. Which of the following process can accelerate leaching?

4. Find the number of stages.

5. The solution can be dried by spraying droplets in a cold gas.

6. Find the process

7. Find the weight of the wet solid if dry solid is 2 kg and the moisture is 0.5 kg.

8. A steam pipe 50 mm diameter and 2.5 m long has been placed horizontally and exposed to still air at 25 degree Celsius. If the pipe wall temperature is 295 degree Celsius, determine the rate of heat loss. At the mean temperature difference of 160 degree Celsius, the thermo-physical properties of air are
k =3.64 * 10 ^-2 W/m K
v =30.09 * 10 ^-6 m²/s
P _r =0.682
Β =1/160 + 273 = 2.31 * 10 ^-3 per K

9. Find the moisture to be evaporated per kg of dried product if initial and final moisture content per kg of dry solid is 85% and 15%.

10. The process elution is also known as elutriation.