DC BOILER EXAM ACTUAL EXAM COMPLETE 240
QUESTIONS AND CORRECT DETAILED ANSWERS
Minimum size piping of a water column? - ANSWER: 1"
Minimun size bottom blowdown on a boiler? - ANSWER: 1"
Maximun size bottom blowdown on a boiler? - ANSWER: 2.5"
What does CO2 stand for? - ANSWER: Carbon dioxide
What does CO stand for? - ANSWER: Carbon monoxide
What indicates incomplete combustion? - ANSWER: CO-not enough air
What ASME section do Special High Boilers fall under? - ANSWER: Section 1
A common type of flame failure will utilize? - ANSWER: Light sensitivity
Where would you obtain a boiler registration certificate? - ANSWER: Department of
Labor & Workforce Development
What is the most accurate way of checking the water level in a boiler? - ANSWER:
Sight glass water level gauge
How can you check the gauge glass level? - ANSWER: By blowing down glass
Who must you notify when you weld a boiler? - ANSWER: Boiler Inspector
Repaired steam leaks will? - ANSWER: Reduce load on boiler
What letter stamp does a high pressure boiler use? - ANSWER: S
One boiler horsepower is equal to? - ANSWER: 34.5 LBS. steam per hour
Minimum horsepower needed to obtain a special boilers license? - ANSWER: 6
Horsepower
Maximun horsepower a special(white seal) operator can operate up to? - ANSWER:
100 Horsepower (over 6 & unto 100hp)
What does oxygen cause? - ANSWER: Pitting
When starting up a cold boiler, it is important to vent all air from the steam space in
order prevent? - ANSWER: Water hammer
, How often do you test a low water cut off? - ANSWER: Daily by blowing down the
column
How do you test a low water cut off - ANSWER: By blowing down the column
How often do you blow down the bottom of your boiler with no chemical analysis? -
ANSWER: Once every 24 hours
How often are boilers inspected? - ANSWER: Annually
What valve allows flow in one direction? - ANSWER: Check valve
What valve prevents reverse flow? - ANSWER: Check valve
What is the function of the flame failure cut out device? - ANSWER: Shut off fuel
supply
What valve is allowed between the safety valve and the boiler? - ANSWER: None(no
valve)
How does a rotary cup burner atomize fuel? - ANSWER: By use of a spinning cup &
high velocity air
What device measures draft? - ANSWER: Manometer
What is the purpose of a boiler certificate? - ANSWER: Prove inspection status
Air must be removed from the boiler to prevent? - ANSWER: Corrosion
The main purpose of testing a safety valve is to? - ANSWER: Make sure valve
operates freely
When testing a safety valve by hand you must? - ANSWER: Have at least 75% of
popping pressure
How often do you test a safety valve? - ANSWER: Monthly, under pressure
Should a safety valve be tested while under pressure? - ANSWER: Yes
What automatically puts water into a boiler? - ANSWER: Automatic feed water
regulator
What does a feed water regulator do? - ANSWER: It automatically feeds water into
boiler
What stamp is needed for a weld repair? - ANSWER: R
QUESTIONS AND CORRECT DETAILED ANSWERS
Minimum size piping of a water column? - ANSWER: 1"
Minimun size bottom blowdown on a boiler? - ANSWER: 1"
Maximun size bottom blowdown on a boiler? - ANSWER: 2.5"
What does CO2 stand for? - ANSWER: Carbon dioxide
What does CO stand for? - ANSWER: Carbon monoxide
What indicates incomplete combustion? - ANSWER: CO-not enough air
What ASME section do Special High Boilers fall under? - ANSWER: Section 1
A common type of flame failure will utilize? - ANSWER: Light sensitivity
Where would you obtain a boiler registration certificate? - ANSWER: Department of
Labor & Workforce Development
What is the most accurate way of checking the water level in a boiler? - ANSWER:
Sight glass water level gauge
How can you check the gauge glass level? - ANSWER: By blowing down glass
Who must you notify when you weld a boiler? - ANSWER: Boiler Inspector
Repaired steam leaks will? - ANSWER: Reduce load on boiler
What letter stamp does a high pressure boiler use? - ANSWER: S
One boiler horsepower is equal to? - ANSWER: 34.5 LBS. steam per hour
Minimum horsepower needed to obtain a special boilers license? - ANSWER: 6
Horsepower
Maximun horsepower a special(white seal) operator can operate up to? - ANSWER:
100 Horsepower (over 6 & unto 100hp)
What does oxygen cause? - ANSWER: Pitting
When starting up a cold boiler, it is important to vent all air from the steam space in
order prevent? - ANSWER: Water hammer
, How often do you test a low water cut off? - ANSWER: Daily by blowing down the
column
How do you test a low water cut off - ANSWER: By blowing down the column
How often do you blow down the bottom of your boiler with no chemical analysis? -
ANSWER: Once every 24 hours
How often are boilers inspected? - ANSWER: Annually
What valve allows flow in one direction? - ANSWER: Check valve
What valve prevents reverse flow? - ANSWER: Check valve
What is the function of the flame failure cut out device? - ANSWER: Shut off fuel
supply
What valve is allowed between the safety valve and the boiler? - ANSWER: None(no
valve)
How does a rotary cup burner atomize fuel? - ANSWER: By use of a spinning cup &
high velocity air
What device measures draft? - ANSWER: Manometer
What is the purpose of a boiler certificate? - ANSWER: Prove inspection status
Air must be removed from the boiler to prevent? - ANSWER: Corrosion
The main purpose of testing a safety valve is to? - ANSWER: Make sure valve
operates freely
When testing a safety valve by hand you must? - ANSWER: Have at least 75% of
popping pressure
How often do you test a safety valve? - ANSWER: Monthly, under pressure
Should a safety valve be tested while under pressure? - ANSWER: Yes
What automatically puts water into a boiler? - ANSWER: Automatic feed water
regulator
What does a feed water regulator do? - ANSWER: It automatically feeds water into
boiler
What stamp is needed for a weld repair? - ANSWER: R
