Power Engineering 4B6 C1 & C4 Practice Questions: Exam Prep &
Study Guide
Mechanical deaeration:
a. removes the dissolved gases from the water
b. is done with the aid of chemicals
c. is used to remove calcium and magnesium from the water
d. is used to remove oxygen only - correct answer ✔✔a. removes the dissolved gases from the
water
Activated carbon is produced from carbonaceous material such as:
1. coal
2. wood
3. magnesium
4. coconut shells
5. peat
a. 1, 3, 4, 5
b. 1, 2, 4, 5
c. 1, 2, 3, 5
d. 2, 3, 4, 5
e. 1, 2, 3, 4 - correct answer ✔✔b. 1, 2, 4, 5
Pitting of boiler metal may be prevented by
,a. agitating the feed water before it enters the boiler
b. the addition of sodium sulphate to the feed water
c. cooling the feed water to between 4C and 16C
d. heating the boiler feed water to between 80C and 105C before it enters the boiler
e. the addition of sodium chloride to the feed water - correct answer ✔✔d. heating the boiler
feed water to between 80C and 105C before it enters the boiler
During the regeneration of a sodium zeolite water softener in the "Rinse" stage the item(s)
going to the sewer is/are:
a. calcium sulphate
b. sodium bicarbonates and sulphates
c. sulphates and bicarbonates
d. calcium and magnesium ions - correct answer ✔✔d. calcium and magnesium ions
As prescribed by boiler codes, deaerators must have a:
a. safety valve
b. external vent condenser
c. overflow control gauge
d. gauge glass - correct answer ✔✔a. safety valve
Bicarbonates can be easily removed from the feedwater by:
a. blowing down the boiler
b. using filter tanks
c. heating the water just below its boiling point
,d. passing the water through a deaerator
e. adding an additional screen - correct answer ✔✔c. heating the water just below its boiling
point
The regenerant used to regenerate a cation demineralizer is:
a. caustic soda
b. hydrochloric acid
c. sulphuric acid
d. sodium chloride - correct answer ✔✔c. sulphuric acid
The spray-type and tray-type are the two basic configurations of mechanical ---------- used to
remove dissolved solids:
a. clarifiers
b. deaerators
c. softeners
d. scrubbers - correct answer ✔✔b. deaerators
A measure of the cloudiness of the water is known as:
a. clarity
b. neutrality
c. visibility
d. turbidity - correct answer ✔✔d. turbidity
Hot lime-soda softeners:
, a. are only used when using well water
b. will remove all dissolved solids from the water
c. are mostly used in small heating plants
d. can treat quantities of water quicker than the cold process type - correct answer ✔✔d. can
treat quantities of water quicker than the cold process type
Filter-Aid tubular filters contain several screen-type cylindrical tubes covered by socks made of:
a. Dacron or polyethylene filter cloth
b. Dacron or cotton fibre cloth
c. Nylon or polyethylene filter cloth
d. Nylon or cotton fibre cloth - correct answer ✔✔a. Dacron or polyethylene filter cloth
Sodium zeolite softeners
a. remove all dissolved solids from the water
b. remove all dissolved solids and suspended matter from the water
c. remove calcium and magnesium from the water
d. are regenerated with an alkaline solution
e. are regenerated with an acid solution - correct answer ✔✔c. remove calcium and magnesium
from the water
It is not true that boiler water is treated for:
a. maintaining boiler water pH below 6
b. preventing carryover of impurities
Study Guide
Mechanical deaeration:
a. removes the dissolved gases from the water
b. is done with the aid of chemicals
c. is used to remove calcium and magnesium from the water
d. is used to remove oxygen only - correct answer ✔✔a. removes the dissolved gases from the
water
Activated carbon is produced from carbonaceous material such as:
1. coal
2. wood
3. magnesium
4. coconut shells
5. peat
a. 1, 3, 4, 5
b. 1, 2, 4, 5
c. 1, 2, 3, 5
d. 2, 3, 4, 5
e. 1, 2, 3, 4 - correct answer ✔✔b. 1, 2, 4, 5
Pitting of boiler metal may be prevented by
,a. agitating the feed water before it enters the boiler
b. the addition of sodium sulphate to the feed water
c. cooling the feed water to between 4C and 16C
d. heating the boiler feed water to between 80C and 105C before it enters the boiler
e. the addition of sodium chloride to the feed water - correct answer ✔✔d. heating the boiler
feed water to between 80C and 105C before it enters the boiler
During the regeneration of a sodium zeolite water softener in the "Rinse" stage the item(s)
going to the sewer is/are:
a. calcium sulphate
b. sodium bicarbonates and sulphates
c. sulphates and bicarbonates
d. calcium and magnesium ions - correct answer ✔✔d. calcium and magnesium ions
As prescribed by boiler codes, deaerators must have a:
a. safety valve
b. external vent condenser
c. overflow control gauge
d. gauge glass - correct answer ✔✔a. safety valve
Bicarbonates can be easily removed from the feedwater by:
a. blowing down the boiler
b. using filter tanks
c. heating the water just below its boiling point
,d. passing the water through a deaerator
e. adding an additional screen - correct answer ✔✔c. heating the water just below its boiling
point
The regenerant used to regenerate a cation demineralizer is:
a. caustic soda
b. hydrochloric acid
c. sulphuric acid
d. sodium chloride - correct answer ✔✔c. sulphuric acid
The spray-type and tray-type are the two basic configurations of mechanical ---------- used to
remove dissolved solids:
a. clarifiers
b. deaerators
c. softeners
d. scrubbers - correct answer ✔✔b. deaerators
A measure of the cloudiness of the water is known as:
a. clarity
b. neutrality
c. visibility
d. turbidity - correct answer ✔✔d. turbidity
Hot lime-soda softeners:
, a. are only used when using well water
b. will remove all dissolved solids from the water
c. are mostly used in small heating plants
d. can treat quantities of water quicker than the cold process type - correct answer ✔✔d. can
treat quantities of water quicker than the cold process type
Filter-Aid tubular filters contain several screen-type cylindrical tubes covered by socks made of:
a. Dacron or polyethylene filter cloth
b. Dacron or cotton fibre cloth
c. Nylon or polyethylene filter cloth
d. Nylon or cotton fibre cloth - correct answer ✔✔a. Dacron or polyethylene filter cloth
Sodium zeolite softeners
a. remove all dissolved solids from the water
b. remove all dissolved solids and suspended matter from the water
c. remove calcium and magnesium from the water
d. are regenerated with an alkaline solution
e. are regenerated with an acid solution - correct answer ✔✔c. remove calcium and magnesium
from the water
It is not true that boiler water is treated for:
a. maintaining boiler water pH below 6
b. preventing carryover of impurities
