4B Power Engineering: Unit 6 - Water Treatment. Exam Questions And Answers 100% Pass
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Course
Power Engineering
Institution
Power Engineering
4B Power Engineering: Unit 6 - Water
Treatment. Exam Questions And Answers
100% Pass
If boiler feedwater is neutral, its pH is:
a. 0
b. 5
c. 7
d. 9
e. 13 - answerc
Pitting of boiler metal may be prevented by:
a. Preheating boiler feed water to between 80 and 105°C
b. Cooling the feeder ...
4B Power Engineering: Unit 6 - Water
Treatment. Exam Questions And Answers
100% Pass
If boiler feedwater is neutral, its pH is:
a. 0
b. 5
c. 7
d. 9
e. 13 - answer✔c
Pitting of boiler metal may be prevented by:
a. Preheating boiler feed water to between 80 and 105°C
b. Cooling the feeder water to between 4 and 16°C
c. The addition of sodium chloride to the feed water
d. Softening the feed water before it enters the boiler
e. Adding sodium sulphate to the feed water - answer✔a
The dissolved solids in raw water:
a. Cause pitting of boiler surfaces
b. Cause grooving of piping surfaces
c. Are organic matter
d. Cannot be removed with filters
Boiler water with a pH of 6 is considered:
a. Alkaline
b. Basic
c. Acidic
d. Neutral
e. Ideal boiler water - answer✔c
The zeolite inside a water softener is used to:
a. Regenerate the brine solution
b. Rinse the softened water
c. Exchange sodium for calcium and magnesium
d. Exchange soda for calcium and magnesium
e. Exchange calcium for magnesium - answer✔c
A treatment method that is often used in conjunction with settling tanks is:
a. Deaeration
b. Zeolite softening
c. De-mineralizing
d. Lime soda softening
e. Filtration - answer✔e
A normal operating range for the pressure in a deaerator is ___________ kPa.
a. 70 to 100
b. 30 to 50
c. 100 to 150
d. 10 to 25
e. 5 to 35 - answer✔a
The chemical used to regenerate the anion exchanger of a demineralizer is:
a. Sodium hydroxide
b. Sulphuric acid
c. Sodium chloride
d. Hydrochloric acid
e. Sulphamic acid - answer✔a
Lime-soda softeners:
a. Remove all dissolved solids from the water
b. Must be backwashed periodically
c. Remove all dissolved solids and gases from the water
d. Remove lime from groundwater
e. Remove the scale forming dissolved solids - answer✔e
Boiler water is treated in order to:
a. prevent the water from becoming too soft
b. prevent the water from becoming too alkaline
c. reduce the environmental impact of the blowoff effluent
d. remove suspended matter
e. prevent scale deposition and waterside corrosion - answer✔e
Water filters must be cleaned:
a. If the water becomes hard
b. When the dissolved solids are high
c. By backwashing the filter media
d. By chemically cleaning the filter media
e. Once per shift - answer✔c
Suspended matter must be removed from feedwater to:
a. Prevent overheating of the boiler metal
b. Prevent boiler waterside scale deposits
c. Reduce the alkalinity of the water
d. Eliminate the hardness of the water
e. Prevent boiler corrosion - answer✔a
Temporary hardness in feedwater is caused by:
a. Calcium sulphate
b. Sodium nitrate
c. Magnesium bicarbonate
d. Calcium carbonate
e. Magnesium sulphate - answer✔c
If flow is too high, the resin in a sodium zeolite softener may be discharged to sewer during the
_________ stage.
a. Injection
b. Service
c. Slow rinse
d. Fast rinse
e. Backwash - answer✔e
The component used to to prevent wasting steam through a deaerator vent is a:
a. Cyclone separator
b. Chevron drier
c. Scrubber
d. Vent condenser
e. Dry pipe - answer✔d
Materials floating on the surface of boiler water, or that are dispersed throughout the water,
are called:
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