Power Engineering 3B1 Chapter 10 Exam 2025 Questions and Answers

Power Engineering 3B1 Chapter 10
Exam 2025 Questions and Answers


Which of the following is caused from scale buildup on boiler tubes:




1. Increased boiler efficiency

2. Weakening of tube metal

3. Decreased boiler efficiency

4. Increased flue gas temperature

5. Cracks in boiler tubes




a. 1,2,3,4

b. 1,3,4,5

c. 2,3,4,5

d. 1,2,4,5


e. 1,2,3,5 - CORRECT ANSWER✔️✔️-c. 2,3,4,5



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,When adding phosphate to the boiler water, the chemical may:




1. Combine with dissolved solids in the boiler water

2. Decrease the dissolved solids in the boiler water

3. Increase the suspended solids in the boiler water

4. Increase the pH of the boiler water




a. 1,2,3

b. 1,2,4

c. 1,3,4

d. 2,3,4


e. 1,2,3,4 - CORRECT ANSWER✔️✔️-c. 1,3,4


Chelating agents fed to the boiler water:




1. Require close control to prevent corrosion

2. Reduce scale build up within high-pressure boilers

3. Protects against corrosion within the boiler

4. Obtains best results with soft water




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, a. 1,2,3

b. 1,2,4

c. 1,3,4

d. 2,3,4


e. 1,2,3,4 - CORRECT ANSWER✔️✔️-b. 1,2,4


Organics, such as tannins, lignins and starches are used to:




1. Control silica in boiler water

2. Reduce corrosion within the boiler

3. Coat suspended solids in the boiler water

4. Produce a non-sticky sludge in the boiler water




a. 1,2,3

b. 1,3,4

c. 1,2,4

d. 2,3,4


e. 1,2,3,4 - CORRECT ANSWER✔️✔️-b. 1,3,4




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