Question 11 : Which of the following is not used for removing the permanent hardness?
1. Lime soda process
2. Zeolite process
3. Demineralization
4. Adding lime
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Question 12 : Which of the following statement is wrong regarding hard water?
1. It cause more consumption of soap in laundry work
2. It causes difficulties in the manufacturing process
3. It increases the taste of food
4. It causes the formation of scales on the boilers
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Question 13 : The thickness of the layers of filter sand of zeolite softener is
1. 20cm
2. 30cm
3. 40cm
4. 100cm
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Question 14 : The chemical formula of Permutit is
1. SiOAl₂O₃Na₂O
2. SiO₂Al₂O₃Na₂O
3. SiO₂Al₂O₃NaO
4. SiO₃Al₂O₃Na₂O
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Question 15 : Which of the following is a disadvantage of zeolite process?
1. No sludge is formed
2. The process is almost automatic
3. Suspended impurities get deposited around the zeolite particles
4. Zero hardness can be occurred
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Question 16 : The detention period of a lime soda treatment plant is
1. 1hour
2. 3hours
3. 2-4hours
4. 4-7hours
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Question 17 : State whether the following statement is true or false.
The permanent hardness can be removed by adding lime and soda.
1. True
2. False
3.
4.
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Question 18 : The sludge in water softening accelerator is deposited at
1. Sedimentation tank
2. Reaction zone
3. Concentrator
4. Secondary mixing zone
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Question 19 : The minimum reaction time allowed in the recarbonation basin is
1. 5minutes
2. 10minutes
3. 15minutes
4. 20minutes
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Question 20 : The color of the artificial zeolite permutit is
1. Grey
2. Yellow
3. Green
4. White
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