Rural Sanitation(Engineering > Waste Water Engineering ) Questions and answers for exam Preparation

Question 1. What is pH below which pH increases?

7
5
4
3

Explanation:-

Answer: Option C. -> 4
Answer: (c).4

Question 2. What is pH range for oxygen removal?

3.5-4.5
6.5-8.5
10-12
12-13.5

Explanation:-

Answer: Option B. -> 6.5-8.5
Answer: (b).6.5-8.5

Question 3. Stainless steel is protected by _______

Iron oxide
Nitrous oxide
Chromium sesquioxide
Carbon monoxide

Explanation:-

Answer: Option C. -> Chromium sesquioxide
Answer: (c).Chromium sesquioxide

Question 4. Increase in __________ concentration usually gives an increase in corrosion rate.

Carbon
Oxygen
Nitrogen
Iron

Explanation:-

Answer: Option B. -> Oxygen
Answer: (b).Oxygen

Question 5. ______ are classified as dangerous inhibitors.

Cathodic inhibitors
Anodic inhibitors
Voltage
Current flow

Explanation:-

Answer: Option B. -> Anodic inhibitors
Answer: (b).Anodic inhibitors

Question 6. Which ions are used as cathodic inhibitors?

Ferric irons
Aluminium ions
Zinc ions
Nickel ions

Explanation:-

Answer: Option C. -> Zinc ions
Answer: (c).Zinc ions

Question 7. What is the reduced potential required to prevent the corrosion of steel?

350 mV
250 mV
150 mV
50 mV

Explanation:-

Answer: Option A. -> 350 mV
Answer: (a).350 mV

Question 8. _______ is suited for open channel monitoring applications.

pH sensor
Ultrasonic technology
Infrared technology
Monitoring meters

Explanation:-

Answer: Option B. -> Ultrasonic technology
Answer: (b).Ultrasonic technology

Question 9. Galvanizing is the process of applying _______ over steel.

Carbon
Aluminium
Zinc
Nickel

Explanation:-

Answer: Option C. -> Zinc
Answer: (c).Zinc

Question 10. PH sensor must remain clean for an accurate reading.

True
False
May be True or False
Can't say

Explanation:-

Answer: Option A. -> True
Answer: (a).True