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WorksheetsHigh Pressure Boilers Chapter 12
Total questions: 25
Worksheet time: 13mins
When taking over a shift, the boiler operator must first check the ___.
steam pressure
fuel oil supply
water level on all boilers
bottom blowdown valves
The low-water fuel cutoff can be tested by blowing down the low-water fuel cutoff or by ___.
securing the feedwater and allowing the water level in the boiler to drop
closing the blowdown valves
modulating the firing rate
a hydrostatic test
In order to prevent uneven expansion of the boiler on cold startup, the boiler must be ___.
warmed up as quickly as possible
thoroughly vented
heated using steam from outside sources
warmed up slowly
During startup, the boiler vent should remain open until a pressure of approximately ___ is reached.
0.1 psi
15 psi
50% of the MAWP
75% of the MAWP
A safety valve can be manually tested when the ___.
pressure is at least 25% of the MAWP
pressure is at least 75% of the MAWP
burner is going through the firing sequence
boiler is down for inspection
Boilers equipped with a superheater must be protected during warm-up by ___.
keeping the superheater drain valve closed until the boiler is cut in on-line
keeping the superheater drain valve open until the boiler is cut in on-line
passing the feedwater through the superheater tubes
bypassing the superheater tubes
Superheaters are prevented from overheated by the circulation of ___.
air
steam
water
gases of combustion
To ensure high heat transfer rates, ___ should be removed from boiler heating surfaces.
flue gas
condensate
carbon dioxide
soot
During boiler shutdown, the ___ should be opened when the steam pressure in the boiler has dropped to 10 psi to 15 psi.
safety valve
free-blowing drain
boiler vent
bottom blowdown valve
As the boiler is cooling down, the boiler operator must maintain ___.
the NOWL
the normal draft condition
the normal feedwater temperature
a 10% CO2 reading
After a boiler has had major repair work done that could affect the boilers internals or has developed a low-water condition, it should be subjected to ___.
an accumulation test
a hydrostatic test
an evaporation test
both an accumulation and a hydrostatic test
A ___ is used to used to verify the flame in a burner.
thermodynamic trap
flame scanner
high limit control
combustion air proving switch
Boilers that are out of service for an extended period of time can be laid up with ___.
the water level above the NOWL
oxygen present to prevent corrosion
carbon dioxide present to prevent corrosion
dry lay-up
Plant emergency procedures should be established by the ___.
operator on duty
insurance inspector
ASME code
chief engineer
A low-water fuel cutoff ___.
shuts off the water supply
shuts off the fuel supply
shuts off the condensate return
shuts off the supply air
A boiler that has experienced a low-water condition should be ___.
thoroughly examined for signs of overheating
thoroughly examined for scale buildup
brought up to full steam pressure to test for leaks
brought up to the NOWL
A high-water condition can be corrected by ___.
closing the main steam stop valve
increasing the firing rate
performing a bottom blowdown
all of the above
When performing a hydrostatic test, the pressure on the boiler should be increased to ___.
1 1/2 times the safety valve setting
2 1/2 times the safety valve setting
2 times the working pressure
6% above the MAWP
If there is danger of the boiler freezing, the boiler should be laid up ___.
with a light fire
by using steam from the header to keep the boiler warm
completely dry
with antifreeze
A furnace explosion can be caused by ___.
excess draft
a low-water condition
loss of feedwater
an accumulation of combustible gases
The ASME Code recommends that boilers be inspected internally and externally every ___.
six months
year
two years
three years
Maintenance work performed inside a boiler requires a(n) ___, which contains procedures based on safety considerations for workers.
accident report
boiler log
inspector notice
confined space permit
New or retubed boilers should be cleaned with ___.
alkaline detergent
muriatic acid
softened water
compressed air
The three ingredients needed to start a fire are fuel, heat, and ___.
carbon dioxide
combustible material
nitrogen
oxygen
A fire caused by oil, gas, grease, or pain would be classified as a Class ___ fire.
A
B
C
D
