Hotel Service Unit 13 Q4 Quiz

Hotel Service Unit 13 Reverse Osmosis Q4

1 / 8

Why is remineralization sometimes required before using permeate water for domestic purposes?

D) To add more dissolved oxygen

B) To decrease the pH to acidic levels

C) To increase the TDS level to above 1000 mg/L

A) To improve the taste and provide essential minerals that are beneficial for health

2 / 8

How is the purity of water typically measured in a reverse osmosis plant?

A) By measuring the water’s color

B) By using a Total Dissolved Solids (TDS) meter to check the concentration of dissolved substances

D) By measuring the water's viscosity

C) By testing for salt taste

3 / 8

What further treatment is commonly applied to permeate water before it can be used for domestic purposes?

D) Boiling to evaporate any remaining impurities

B) Freezing to solidify impurities

C) Adding salt back into the water

A) Chlorination to prevent microbial growth in storage and distribution

4 / 8

What is the maximum acceptable TDS level in potable water, according to World Health Organization (WHO) standards?

B) 500 mg/L

A) 100 mg/L

C) 1500 mg/L

D) 3000 mg/L

5 / 8

Why is chlorination sometimes used in the pre-treatment of feedwater in reverse osmosis systems?

A) To heat the water

D) To add flavor to the water

B) To remove dissolved minerals

C) To kill bacteria and prevent biofouling on the membranes

6 / 8

Which filtration method is often used in pre-treatment to remove particles from feedwater?

B) Sand filtration

A) Reverse osmosis

D) Ion exchange

C) Chemical precipitation

7 / 8

What is one of the primary treatments applied to feedwater in a reverse osmosis plant to prevent membrane blockage?

B) Adding anti-scalants to prevent scale formation

C) Increasing the water’s salt concentration

A) Heating the water

D) Freezing the water before filtration

8 / 8

Which parameter is commonly monitored alongside TDS to ensure water quality in a reverse osmosis plant?

C) Water color

D) Odor

A) pH level

B) Water temperature

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