Explore topic-wise MCQs in Waste Water Engineering.

This section includes 23 Mcqs, each offering curated multiple-choice questions to sharpen your Waste Water Engineering knowledge and support exam preparation. Choose a topic below to get started.

1.

Calculate the recovery for the following data:Product Flow: 535 m3/h.Feed flow : 635 m3/h.Flux considered: 12 lmh

A. 80%
B. 85%
C. 90%
D. 75%
Answer» C. 90%
Discussion
2.

Calculate the number of membranes required for the following data:Flow: 535 m3/h.Area: 400 m2Flux considered: 12 lmh

A. 112
B. 115
C. 117
D. 120
Answer» B. 115
Discussion
3.

What is the operating pH for RO systems?

A. 2-3
B. 4-6
C. 5-7
D. 8-9
Answer» D. 8-9
Discussion
4.

What is the design temperature of RO systems?

A. 20˚C
B. 25˚C
C. 30˚C
D. 35˚C
Answer» C. 30˚C
Discussion
5.

What is the maximum acceptable limit of temperature for RO?

A. 20˚C
B. 30˚C
C. 40˚C
D. 50˚C
Answer» D. 50˚C
Discussion
6.

The water flux of RO membranes ______ as water viscosity lowers.

A. Increases
B. Decreases
C. Alters
D. Fluctuates
Answer» B. Decreases
Discussion
7.

WHAT_IS_THE_MAXIMUM_ACCEPTABLE_LIMIT_OF_TEMPERATURE_FOR_RO??$

A. 20ÀöC
B. 30ÀöC
C. 40ÀöC
D. 50ÀöC
Answer» D. 50‚àö√Ñ‚àö‚àÇC
Discussion
8.

What is the operating pH for RO systems?$

A. 2-3
B. 4-6
C. 5-7
D. 8-9
Answer» D. 8-9
Discussion
9.

What_is_the_design_temperature_of_RO_systems?$

A. 20ÀöC
B. 25ÀöC
C. 30ÀöC
D. 35ÀöC
Answer» C. 30‚àö√Ñ‚àö‚àÇC
Discussion
10.

How is Net driving pressure mathematically expressed?

A. Net driving pressure = P<sub>f</sub> – 0.5 * D<sub>P</sub> – P<sub>p</sub> -P<sub>osmavg</sub>
B. Net driving pressure = 0.5 * DP –P<sub>p</sub> – P<sub>osmavg</sub>
C. Net driving pressure = P<sub>f</sub> – 0.5 * D<sub>P</sub> – P<sub>p</sub>
D. Net driving pressure = P<sub>f</sub> * D<sub>P</sub> – P<sub>p</sub> -P<sub>osmavg</sub>
Answer» B. Net driving pressure = 0.5 * DP ‚Äö√Ñ√∂‚àö√ë‚àö¬®P<sub>p</sub> ‚Äö√Ñ√∂‚àö√ë‚àö¬® P<sub>osmavg</sub>
Discussion
11.

What is the flux considered while designing a reverse osmosis system for treating surface water with UF system?

A. 15-20 LMH
B. 20-30 LMH
C. 12-15 LMH
D. 30-35 LMH
Answer» C. 12-15 LMH
Discussion
12.

What is the flux considered while designing a reverse osmosis system for treating surface water?

A. 15-22 LMH
B. 22-30 LMH
C. 12-15 LMH
D. 30-35 LMH
Answer» B. 22-30 LMH
Discussion
13.

What is the flux considered while designing a reverse osmosis system for treating bore well water?

A. 30-40 LMH
B. 40-50 LMH
C. 20-30 LMH
D. 12-18 LMH
Answer» D. 12-18 LMH
Discussion
14.

What is the flux considered while designing a reverse osmosis system for treating RO permeate?

A. 30-40 LMH
B. 12-18 LMH
C. 20-25 LMH
D. 25-30 LMH
Answer» B. 12-18 LMH
Discussion
15.

What is the thumb rule to consider for osmotic pressure?

A. 1 psi for every 86 ppm of Na
B. 2 psi for every 86ppm of Na
C. 1 psi for every 43 ppm of Na
D. 2 psi for every 43 ppm of Na
Answer» B. 2 psi for every 86ppm of Na
Discussion
16.

The water flux of RO membranes ______ as water viscosity lowers?

A. Increases
B. Decreases
C. Alters
D. Fluctuates
Answer» B. Decreases
Discussion
17.

The upper limit of brine concentration is ______ times the normal sea water.

A. 1.5
B. 2
C. 2.5
D. 3
Answer» D. 3
Discussion
18.

The osmotic pressure of the brine increases proportionally to the salt concentration.

A. True
B. False
Answer» B. False
Discussion
19.

Concentrated seawater which is called _________

A. Permeate
B. Brine
C. RO water
D. Salt water
Answer» C. RO water
Discussion
20.

RO membranes are made of _______

A. Plastic
B. Cotton
C. Silk
D. Polymer
Answer» E.
Discussion
21.

Membrane permeation rate increases proportionally to effective pressure.

A. True
B. False
Answer» B. False
Discussion
22.

What is the osmotic pressure for sea water?

A. 1.5 Mpa
B. 1.8 Mpa
C. 2.3 Mpa
D. 2.45 Mpa
Answer» E.
Discussion
23.

The ________ the salt rejection, the better the system is performing.

A. Higher
B. Lower
C. Moderate
D. Poor
Answer» B. Lower
Discussion