Engineering Questions with Answers - Multiple Choice Questions

# Separation Processes MCQ’s – Reverse Osmosis

1 - Question

Why is osmosis not a good separation process?
a) Because it involves semipermeable membrane
b) Because it transfers solvent from wrong direction
c) Because it involves movement of solute particles
d) Because it requires high temperatures
Explanation: Osmosis is not a good separation technique since it transfers solvent from wrong direction leading to mixing rather than separation.

2 - Question

What is the principle of reverse osmosis?
a) The direction of solvent flow Can be reversed by applying pressure greater than osmotic pressure
b) The direction of solvent flow can be reversed by applying pressure less than osmotic pressure
c) The direction of solvent flow can be reversed by using a permeable membrane
d) The solvent flow can be reversed by concentrating the mixture
Explanation: The direction of solvent flow Can be reversed by applying pressure greater than osmotic pressure. Hence P- osmotic pressure = pi.

3 - Question

If the Temperature is 300K and the concentration of solute(CB) is 0.5, what is the osmotic pressure?
a) 150R
b) 200R
c) 300R
d) 350R

Explanation: = RTCB, hence = r*300*0.5=150R.

4 - Question

If the Temperature is 400K and the concentration of solute(CB) is 0.5, what is the osmotic pressure?
a) 150R
b) 200R
c) 300R
d) 350R
Explanation: = RTCB, hence = r*400*0.5=200R

5 - Question

If the Temperature is 100K and the concentration of solute(CB) is 0.6, what is the osmotic pressure?
a) 150R
b) 200R
c) 600R
d) 60R
Explanation: = RTCB, hence = R*100*0.6=60R.

6 - Question

If the Temperature is 350K and the concentration of solute(CB) is 0.6, what is the osmotic pressure?
a) 150R
b) 167R
c) 175R
d) 350R
Explanation: = RTCB, hence = R*350*0.5=175R.

7 - Question

If the Temperature is 300K and the concentration of solute(CB) is 0.75, what is the osmotic pressure?
a) 150R
b) 200R
c) 225R
d) 325R
Explanation: = RTCB, hence = R*300*0.75=225R.

8 - Question

If the Temperature is 300K and the concentration of solute(CB) is 0.3, what is the osmotic pressure?
a) 50R
b) 60R
c) 70R
d) 90R
Explanation: = RTCB, hence = R*300*0.3=90R.

9 - Question

Which of the following is not a use of reverse osmosis?
a) Treatment of industrial waste water to remove heavy metal ions
b) Separation of sulfites and bisulfites from paper and processing industry effluents
c) Treatment of municipal water to remove inorganic salts
d) Treatment of industrial effluents to decolorize it
Explanation: Reverse osmosis does not decolorize the water.

10 - Question

What is a normal tolerance value for concentration polarization coefficient?
a) 0.1
b) 0.2
c) 0.3
d) 0.5