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4th Class Power Engineering Unit A12 Elements of Boiler Systems questions and answers
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4th Class Power Engineering Unit A12 Elements of Boiler Systems questions and answers
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4th Class Power EngineeringUnit A12: Elements of Boiler
Systems questions and
answers
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
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