Hotel Service Unit 13 Q6 Quiz

Hotel Service Unit 13 Reverse Osmosis Q6

1 / 10

What are the two main outputs in a reverse osmosis system?

B) Permeate (fresh water) and concentrate (waste brine)

D) High-pressure and low-pressure water

C) Oxygenated water and deoxygenated water

A) Feedwater and treated water

2 / 10

Why is pre-treatment important in a reverse osmosis system?

A) To cool down the water

B) To increase salinity

C) To remove particles and chemicals that could damage or clog the membrane

D) To heat the water for better filtration

3 / 10

How can reverse osmosis systems improve energy efficiency?

B) By reusing the energy from high-pressure concentrate

C) By reducing water temperature

D) By using thicker membranes

A) By increasing the flow rate

4 / 10

For what purpose is reverse osmosis commonly used?

B) To filter air

A) To heat water in cooling systems

C) To produce fresh drinking water from seawater by removing dissolved salts

D) To sterilize medical equipment

5 / 10

Why is high pressure needed in a reverse osmosis plant?

D) To add oxygen to the water

A) To prevent the membrane from moving

C) To boil the water

B) To push water through the membrane, overcoming natural osmotic pressure

6 / 10

What role does osmotic pressure play in reverse osmosis?

C) It adds impurities to the water

D) It equalizes salt concentrations on both sides of the membrane

A) It helps water flow naturally through the membrane without added pressure

B) It must be overcome by applying higher pressure to move water through the membrane in the opposite direction

7 / 10

Which of the following is a limitation of reverse osmosis as a method of desalination?

D) It operates without any pressure

B) It is a chemical-free process

A) It requires no maintenance

C) It requires high energy input and can produce concentrated brine waste

8 / 10

What is the basic principle behind reverse osmosis?

B) High pressure is applied to force water through a semi-permeable membrane, leaving salts and impurities behind

A) Heat is applied to water to evaporate and condense it

C) Chemicals are added to separate salt from water

D) Water flows naturally through a membrane to balance salt concentration

9 / 10

What is the function of the semi-permeable membrane in reverse osmosis?

B) To allow only water molecules to pass through while blocking dissolved salts and impurities

D) To increase the pressure of the water

C) To remove large particles only

A) To add minerals to the water

10 / 10

What is one reason why reverse osmosis membranes need regular maintenance?

D) To increase osmotic pressure

C) To add chemicals to the permeate

B) To clean or replace membranes clogged with particles or biofouling

A) To increase water temperature

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