Question 1

How much chromium is required to provide oxidation resistance for use over 1000oC?

Accepted Answer

A) 1% 
B) 6% 
C) 12% 
D) 17% 
A) 1% 
B) 6% 
C) 12% 
D) 17% D

Question 2

% chromium mixed with ______ can be used up to 1100oC.

Accepted Answer

A) Nickel 
B) Chromium 
C) Aluminum 
D) Silicon 
A) Nickel 
B) Chromium 
C) Aluminum 
D) Silicon A

Question 3

Fluorex is a special mixture of ____________

Accepted Answer

A) Di-calcium phosphate and carbon 
B) Tri-calcium phosphate and hydroxyapatite 
C) Di-calcium phosphate and phosphoric acid 
D) Tri-calcium phosphate and carbon 
A) Di-calcium phosphate and carbon 
B) Tri-calcium phosphate and hydroxyapatite 
C) Di-calcium phosphate and phosphoric acid 
D) Tri-calcium phosphate and carbon B

Question 4

The process of reducing the fluoride content from water is called _____

Accepted Answer

A) Chlorination 
B) Fluoridation 
C) Defluoridation 
D) Flocculation 
A) Chlorination 
B) Fluoridation 
C) Defluoridation 
D) Flocculation

Question 5

How can caustic embrittlement be avoided?

Accepted Answer

A) Addition of nickel 
B) Increasing potential 
C) Decreasing carbon 
D) Adding tannins 
A) Addition of nickel 
B) Increasing potential 
C) Decreasing carbon 
D) Adding tannins

Question 6

Which of these metals does not require alloying for oxidation resistance?

Accepted Answer

A) Iron 
B) Copper 
C) Aluminum 
D) Molybdenum 
A) Iron 
B) Copper 
C) Aluminum 
D) Molybdenum

Question 7

A grit chamber is usually installed ______ primary sedimentation tanks.

Accepted Answer

A) Before 
B) After 
C) In between 
D) In 
A) Before 
B) After 
C) In between 
D) In

Question 8

What is the cleaning period for manual grit chambers?

Accepted Answer

A) 3 days 
B) 5 days 
C) 48 hours 
D) 1 week 
A) 3 days 
B) 5 days 
C) 48 hours 
D) 1 week

Question 9

Which material is used in contact filters for the removal of fluorides?

Accepted Answer

A) Calcium phosphate 
B) Copper sulfate 
C) Synthetic tri-calcium phosphate 
D) Bone charcoal 
A) Calcium phosphate 
B) Copper sulfate 
C) Synthetic tri-calcium phosphate 
D) Bone charcoal

Question 10

Which material is used for removing fluorides from hard water containing 3ppm of fluorides?

Accepted Answer

A) Lime 
B) Copper sulfate 
C) Synthetic tri-calcium phosphate 
D) Bone charcoal 
A) Lime 
B) Copper sulfate 
C) Synthetic tri-calcium phosphate 
D) Bone charcoal

Question 11

At which temperature, the bone is calcinated during defluoridation with calcium phosphate?

Accepted Answer

A) 100-200oC 
B) 200-300oC 
C) 400-600oC 
D) 500-800oC 
A) 100-200oC 
B) 200-300oC 
C) 400-600oC 
D) 500-800oC

Question 12

What happens when water contains 8-20 ppm of fluoride concentration?

Accepted Answer

A) Blue baby disease 
B) Crippling fluorosis 
C) Dental fluorosis 
D) Mottling of teeth 
A) Blue baby disease 
B) Crippling fluorosis 
C) Dental fluorosis 
D) Mottling of teeth

Question 13

Which of the following is the pure compound?

Accepted Answer

A) Sodium fluoride 
B) Sodium silico fluoride 
C) Hydrofluosilicic acid 
D) Sodium fluro carbonate 
A) Sodium fluoride 
B) Sodium silico fluoride 
C) Hydrofluosilicic acid 
D) Sodium fluro carbonate

Question 14

Which of these is not a way to prevent intergranular corrosion?

Accepted Answer

A) Reduction of carbon level 
B) Quenching 
C) Addition of carbide forming elements 
D) Reduction of alloying elements 
A) Reduction of carbon level 
B) Quenching 
C) Addition of carbide forming elements 
D) Reduction of alloying elements

Question 15

Season-cracking can be prevented by cold-working of brass at _________

Accepted Answer

A) 15oC 
B) 100oC 
C) 300oC 
D) 550oC 
A) 15oC 
B) 100oC 
C) 300oC 
D) 550oC

Question 16

Which of the following is not used for defluoridation?

Accepted Answer

A) Calcium phosphate 
B) Copper sulfate 
C) Alum 
D) Bone charcoal 
A) Calcium phosphate 
B) Copper sulfate 
C) Alum 
D) Bone charcoal

Question 17

At what velocity will the particles settle down?

Accepted Answer

A) 0.5 m/s 
B) 0.3 m/s 
C) 0.1 m/s 
D) 0.25 m/s 
A) 0.5 m/s 
B) 0.3 m/s 
C) 0.1 m/s 
D) 0.25 m/s

Question 18

Galvanized ion is made by dipping low carbon steel in molten zinc at ________

Accepted Answer

A) 100oC 
B) 150oC 
C) 200oC 
D) 450oC 
A) 100oC 
B) 150oC 
C) 200oC 
D) 450oC

Question 19

Molybdenum with hydrogen can be used up to ________

Accepted Answer

A) 1000oC 
B) 1500oC 
C) 2000oC 
D) 4000oC 
A) 1000oC 
B) 1500oC 
C) 2000oC 
D) 4000oC

Question 20

Grit chambers are constructed to prevent their accumulation in _______

Accepted Answer

A) Sedimentation tank 
B) Sludge digesters 
C) Coagulation tank 
D) Sand filter 
A) Sedimentation tank 
B) Sludge digesters 
C) Coagulation tank 
D) Sand filter

How much chromium is required to provide oxidation resistance for use over 1000^oC?

% chromium mixed with ______ can be used up to 1100^oC.

Fluorex is a special mixture of ____________

The process of reducing the fluoride content from water is called _____

How can caustic embrittlement be avoided?

Which of these metals does not require alloying for oxidation resistance?

A grit chamber is usually installed ______ primary sedimentation tanks.

What is the cleaning period for manual grit chambers?

Which material is used in contact filters for the removal of fluorides?

Which material is used for removing fluorides from hard water containing 3ppm of fluorides?

At which temperature, the bone is calcinated during defluoridation with calcium phosphate?

What happens when water contains 8-20 ppm of fluoride concentration?

Which of the following is the pure compound?

Which of these is not a way to prevent intergranular corrosion?

Season-cracking can be prevented by cold-working of brass at _________

Which of the following is not used for defluoridation?

At what velocity will the particles settle down?

Galvanized ion is made by dipping low carbon steel in molten zinc at ________

Molybdenum with hydrogen can be used up to ________

Grit chambers are constructed to prevent their accumulation in _______

Understanding Water Pollution and Its Effects on Aquatic Life

Water Pollution and Regulations

Pollutants From Wastewater: A Study on River Pollution Control and Wastewater Treatment

Water Treatment and Softening Processes

Water Treatment and Pollution Control

Grit Chambers and Activated Sludge Processes

Demineralized Water, Ion-Exchange, and Ozonation Processes

Sewage Sludge and Treatment Processes

Filters

Exam 6: Compounds, Fluoridation, and Oxidation Resistance

How much chromium is required to provide oxidation resistance for use over 1000oC?

% chromium mixed with ______ can be used up to 1100oC.

Fluorex is a special mixture of ____________

The process of reducing the fluoride content from water is called _____

How can caustic embrittlement be avoided?

Which of these metals does not require alloying for oxidation resistance?

A grit chamber is usually installed ______ primary sedimentation tanks.

What is the cleaning period for manual grit chambers?

Which material is used in contact filters for the removal of fluorides?

Which material is used for removing fluorides from hard water containing 3ppm of fluorides?

At which temperature, the bone is calcinated during defluoridation with calcium phosphate?

What happens when water contains 8-20 ppm of fluoride concentration?

Which of the following is the pure compound?

Which of these is not a way to prevent intergranular corrosion?

Season-cracking can be prevented by cold-working of brass at _________

Which of the following is not used for defluoridation?

At what velocity will the particles settle down?

Galvanized ion is made by dipping low carbon steel in molten zinc at ________

Molybdenum with hydrogen can be used up to ________

Grit chambers are constructed to prevent their accumulation in _______

Understanding Water Pollution and Its Effects on Aquatic Life

Water Pollution and Regulations

Pollutants From Wastewater: A Study on River Pollution Control and Wastewater Treatment

Water Treatment and Softening Processes

Water Treatment and Pollution Control

Grit Chambers and Activated Sludge Processes

Demineralized Water, Ion-Exchange, and Ozonation Processes

Sewage Sludge and Treatment Processes

Filters

How much chromium is required to provide oxidation resistance for use over 1000^oC?

% chromium mixed with ______ can be used up to 1100^oC.