3A2:4th Class Power Engineering Unit
A12: Elements of Boiler Systems
Study Guide.
In falling shot cleaning, iron shot or pellets, _________ mm in diameter fall by gravity:
Select one:
a. 6
b. 9
c. 3
d. 12 - Answer a
With this system, not electrical power is required to feed make-up water to the boiler:
Select one:
a. gravity return system
b. pump return system
c. low flow return system
d. high side return system - Answer a
Combustion air provide din addition to primary and secondary air used to completer the
combustion processes in some burner designs is called:
Select one:
a. tertiary air
b. theoretical air
c. terreria air
d. third air - Answer a
The channel through which fuel is fed in an underfeed stoker arrangement is called a:
Select one:
a. retort
b. repose
c. ram block
d. tuyeres - Answer a
The amount of air delivered for combustion above the theoretical air is called:
,Select one:
a. free air
b. tertiary air
c. secondary air
d. excess air - Answer d
This type of measurement is often used to determine the dissolved solids concentration in
boiler water:
Select one:
a. iron test
b. pH test
c. conductivity test
d. silica test - Answer c
Oil leaves the end of the rotating cup on a rotary cup oil burner at or near a _________, as it
enters the air stream:
Select one:
a. 45o angle
b. 25o angle
c. 90o angle
d. 60o angle - Answer c
The exact amount of air required to supply oxygen for complete combustion is called:
Select one:
a. theoretical air
b. tertiary air
c. secondary air
d. excess air - Answer a
A difference in pressure that causes gases to flow into and out of a furnace is:
Select one:
a. variable pressure
b. differential pressure
c. force
d. draft - Answer d
, These are similar to combined feedwater feeder/cut-offs, with the exception that they do not
have integral mechanically operated control valves:
Select one:
a. float control feeders
b. float control switches
c. switch control feeders
d. switch control floats - Answer b
To conserve energy, _________ can be installed in the blowdown system:
Select one:
a. automatic shut offs
b. heat recovery systems
c. filters
d. water purifiers - Answer b
Another name for acoustic cleaning is:
Select one:
a. sonic cleaning
b. sonar cleaning
c. rapping
d. soot blowing - Answer a
This is used to remove soot from the superheater and reheater banks:
Select one:
a. short retractable soot blower
b. long retractable soot blower
c. stationary soot blower
d. shot soot blower - Answer b
This type of piping must never be used in a blowoff or blowdown system:
Select one:
a. galvanized
b. steel
c. schedule 80
A12: Elements of Boiler Systems
Study Guide.
In falling shot cleaning, iron shot or pellets, _________ mm in diameter fall by gravity:
Select one:
a. 6
b. 9
c. 3
d. 12 - Answer a
With this system, not electrical power is required to feed make-up water to the boiler:
Select one:
a. gravity return system
b. pump return system
c. low flow return system
d. high side return system - Answer a
Combustion air provide din addition to primary and secondary air used to completer the
combustion processes in some burner designs is called:
Select one:
a. tertiary air
b. theoretical air
c. terreria air
d. third air - Answer a
The channel through which fuel is fed in an underfeed stoker arrangement is called a:
Select one:
a. retort
b. repose
c. ram block
d. tuyeres - Answer a
The amount of air delivered for combustion above the theoretical air is called:
,Select one:
a. free air
b. tertiary air
c. secondary air
d. excess air - Answer d
This type of measurement is often used to determine the dissolved solids concentration in
boiler water:
Select one:
a. iron test
b. pH test
c. conductivity test
d. silica test - Answer c
Oil leaves the end of the rotating cup on a rotary cup oil burner at or near a _________, as it
enters the air stream:
Select one:
a. 45o angle
b. 25o angle
c. 90o angle
d. 60o angle - Answer c
The exact amount of air required to supply oxygen for complete combustion is called:
Select one:
a. theoretical air
b. tertiary air
c. secondary air
d. excess air - Answer a
A difference in pressure that causes gases to flow into and out of a furnace is:
Select one:
a. variable pressure
b. differential pressure
c. force
d. draft - Answer d
, These are similar to combined feedwater feeder/cut-offs, with the exception that they do not
have integral mechanically operated control valves:
Select one:
a. float control feeders
b. float control switches
c. switch control feeders
d. switch control floats - Answer b
To conserve energy, _________ can be installed in the blowdown system:
Select one:
a. automatic shut offs
b. heat recovery systems
c. filters
d. water purifiers - Answer b
Another name for acoustic cleaning is:
Select one:
a. sonic cleaning
b. sonar cleaning
c. rapping
d. soot blowing - Answer a
This is used to remove soot from the superheater and reheater banks:
Select one:
a. short retractable soot blower
b. long retractable soot blower
c. stationary soot blower
d. shot soot blower - Answer b
This type of piping must never be used in a blowoff or blowdown system:
Select one:
a. galvanized
b. steel
c. schedule 80
