Feedwater Control Multiple Choice Questions and Answers

1. Thermal treatment methods used to remove impurities like:

a) Dissolved carbon dioxide and other gases

b) Solid materials

c) Carbonate

d) Bacterial impurities

Answer: Dissolved carbon dioxide and other gases

2. Boiler modulating feedwater control flow rate depends on

a) level set point

b) control valve position

c) actual level

d) set point, level, and valve position

Answer: set point, level, and valve position

3. Feed water for boiler of thermal power plant is obtained from:

a) Natural sources like river and lake

b) Partly from condensed steam and natural sources

c) Condensed steam and small percentage from natural resources

d) Natural sources and small percentage from condensed steam

Answer: Condensed steam and small percentage from natural resources

4. Which method is used in large modern thermal power plants to heat feed water?

a) Open type heatre is used

b) Close type heater is used

c) Steam is directly taken from main turbine and used to heat it feed water

d) Surface type heater is used

Answer: Steam is directly taken from main turbine and used to heat it feed water

5. Chemical method of treatment is used for treatment of:

a) Diissolve gases

b) Carbonate and carbon dioxide

c) Bacterial impurities

d) Send and suspended materials

Answer: Carbonate and carbon dioxide

6. Mechanical method of water treatment is done to _____________

a) Heat the feed water

b) To remove solid matter and impurities

c) To add some solid materials

d) To remove dissolved gases

Answer: To remove solid matter and impurities

7. On a steam boiler with single element feedwater control, the following item is measured

a) steam flow

b) feedwater flow

c) boiler water level

d) fuel flow

Answer: boiler water level

8. Scall formation in boiler tube causes ____________

a) reduction of heat transfer and overheating of boiler tube

b) corrosion of boiler surface

c) feeling up of steam passage

d) cracks in the ages rivites

Answer: reduction of heat transfer and overheating of boiler tube

9. Which of the following is not a reason of heating feed water?

a) It improves overall efficiency

b) It removes dissolved impurities

c) It prevents from thermal stress which may cause due to enter of cold water into boiler

d) It produces steam from feed water

Answer: It produces steam from feed water

10. In a two element feedwater control the following items are measured

a) boiler water level and steam flow

b) feedwater flow and steam flow

c) boiler water level and feedwater flow

d) boiler water level and fuel flow

Answer: boiler water level and steam flow

11. On a steam boiler with _________ the boiler water level is measured

a) feedwater control

b) feedwater flow

c) boiler water level

d) single element feedwater control

Answer: single element feedwater control

12. Boiler modulating feedwater control ________ depends on set point, level, and valve position

a) feedwater control

b) feedwater flow

c) boiler water level

d) flow rate

Answer: flow rate

13. Feed water for boiler of thermal power plant is obtained from Condensed steam and _______

a) small percentage from natural resources

b) Natural sources like river and lake

c) natural sources

d) small percentage from condensed steam

Answer: small percentage from natural resources

14. Heat treatment arrangement used to separate or remove deserved gases and impurities from feed water is called the year later.

a) true

b) False

Answer: true

15. Chemical method of treatment is used for treatment of Diissolve gases

a) true

b) False

Answer: False