Power Engineering - 4B6 C2,3,5 Practice Questions With
Complete Solutions
A common metal used for sacrificial anodes is:
a. lead
b. silver
c. copper
d. zinc
e. steel Correct Answers d. zinc
A complete visual inspection of your cooling system should be
performed __________ on well running systems:
a. once a shift
b. once biweekly
c. once a month
d. once a day
e. once a week Correct Answers c. once a month
A conductivity meter measures:
a. hardness in parts per million or grains per gallon
b. total alkalinity
c. total suspended matter
d. hydroxide alkalinity (caustic alkalinity)
e. total dissolved solids Correct Answers e. total dissolved
solids
A continuous blow-off is
,a. installed in the steam drum
b. installed in the lower drum
c. used to reduce the dissolved gases in the boiler
d. used to reduce sludge
e. used on every boiler Correct Answers a. installed in the steam
drum
A disadvantage of using sodium sulphite in a boiler to remove
dissolved oxygen is that:
a. it may increase caustic corrosion
b. it increases the total dissolved solids in the boiler
c. it decreases the effect of the deaerator
d. it produces corrosion
e. it does not prevent scale build up Correct Answers b. it
increases the total dissolved solids in the boiler
A phosphate residual of -- to -- ppm should be maintained for
most steam boiler water systems. Correct Answers 20 to 40
A residual of 20 to 40 ppm of sodium sulphite is to be
maintained in the boiler water to
a. keep down the sludge
b. reduce the total chemical consumption
c. prevent pitting in the boiler steam drum
d. keep feed water lines free of algae
e. prevent scaling the float in the low water cut-off Correct
Answers c. prevent pitting in the boiler steam drum
,A sludge conditioner will keep precipitated dissolved solids
fluid, well dispersed, and:
a. prevent them from adhering to the metal
b. permit their removal through a CBD
c. is usually a non-organic compound
d. in solution Correct Answers a. prevent them from adhering to
the metal
Adding sodium nitrate, lignins, and ---------- has been found
effective in preventing caustic embrittlement. Correct Answers
tannins
Addition of neutralizing amines to the condensate causes its pH
to increase.
a. True
b. False Correct Answers a. True
Alkalinity in boiler water may be due to calcium, sodium or
magnesium
a. hydroxides, carbonates and bicarbonates
b. bicarbonates
c. hydroxides and bicarbonates
d. carbonates and bicarbonates
e. hydroxides Correct Answers a. hydroxides, carbonates and
bicarbonates
Amines should not be fed to boilers using nitrite as they can
form:
, a. a carcinogenic compound
b. a pathogenic compound
c. a sedimented compound
d. an analgesic compound
e. a contagium compound Correct Answers a. a carcinogenic
compound
Ammonia can be used to control pH, but cannot be used with:
1. stainless steel
2. copper
3. PVC
4. nickle
5. carbon steel
a. 3, 4
b. 2, 4
c. 2, 3
d. 2, 5
e. 1, 4 Correct Answers b. 2, 4
An acceptable pH value for boiler water is
a. 10.50
b. 7.00
c. 11.75
d. 6.95
e. 8.35 Correct Answers a. 10.50
Complete Solutions
A common metal used for sacrificial anodes is:
a. lead
b. silver
c. copper
d. zinc
e. steel Correct Answers d. zinc
A complete visual inspection of your cooling system should be
performed __________ on well running systems:
a. once a shift
b. once biweekly
c. once a month
d. once a day
e. once a week Correct Answers c. once a month
A conductivity meter measures:
a. hardness in parts per million or grains per gallon
b. total alkalinity
c. total suspended matter
d. hydroxide alkalinity (caustic alkalinity)
e. total dissolved solids Correct Answers e. total dissolved
solids
A continuous blow-off is
,a. installed in the steam drum
b. installed in the lower drum
c. used to reduce the dissolved gases in the boiler
d. used to reduce sludge
e. used on every boiler Correct Answers a. installed in the steam
drum
A disadvantage of using sodium sulphite in a boiler to remove
dissolved oxygen is that:
a. it may increase caustic corrosion
b. it increases the total dissolved solids in the boiler
c. it decreases the effect of the deaerator
d. it produces corrosion
e. it does not prevent scale build up Correct Answers b. it
increases the total dissolved solids in the boiler
A phosphate residual of -- to -- ppm should be maintained for
most steam boiler water systems. Correct Answers 20 to 40
A residual of 20 to 40 ppm of sodium sulphite is to be
maintained in the boiler water to
a. keep down the sludge
b. reduce the total chemical consumption
c. prevent pitting in the boiler steam drum
d. keep feed water lines free of algae
e. prevent scaling the float in the low water cut-off Correct
Answers c. prevent pitting in the boiler steam drum
,A sludge conditioner will keep precipitated dissolved solids
fluid, well dispersed, and:
a. prevent them from adhering to the metal
b. permit their removal through a CBD
c. is usually a non-organic compound
d. in solution Correct Answers a. prevent them from adhering to
the metal
Adding sodium nitrate, lignins, and ---------- has been found
effective in preventing caustic embrittlement. Correct Answers
tannins
Addition of neutralizing amines to the condensate causes its pH
to increase.
a. True
b. False Correct Answers a. True
Alkalinity in boiler water may be due to calcium, sodium or
magnesium
a. hydroxides, carbonates and bicarbonates
b. bicarbonates
c. hydroxides and bicarbonates
d. carbonates and bicarbonates
e. hydroxides Correct Answers a. hydroxides, carbonates and
bicarbonates
Amines should not be fed to boilers using nitrite as they can
form:
, a. a carcinogenic compound
b. a pathogenic compound
c. a sedimented compound
d. an analgesic compound
e. a contagium compound Correct Answers a. a carcinogenic
compound
Ammonia can be used to control pH, but cannot be used with:
1. stainless steel
2. copper
3. PVC
4. nickle
5. carbon steel
a. 3, 4
b. 2, 4
c. 2, 3
d. 2, 5
e. 1, 4 Correct Answers b. 2, 4
An acceptable pH value for boiler water is
a. 10.50
b. 7.00
c. 11.75
d. 6.95
e. 8.35 Correct Answers a. 10.50
