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Minnesota Special Engineer Boiler
License Exam Questions and Verified
Answers 2025
QUESTION
The purpose of the expansion tank is to? Answer: Provide for expansion and contraction of the water volume as its temperature varies
QUESTION
On a hot water boiler, what is the purpose of the vent valve? Answer: To make sure there is water in the boiler and to vent out any trapped air
QUESTION
If the safety valve or A.S.M.E. safety relief valve leaks what would you do? Answer: Have the valve repaired or replaced
QUESTION
Tri-cocks or gauge cocks are used on a steam boiler to indicate? Answer: The true water level inside the boiler
QUESTION
On a steam or hot water boiler, the safety valve or safety relief valve could be tested by? Answer: Lifting the lever on the valve or raising the pressure until they operate
QUESTION
Before starting a steam or hot water boiler what should you check for? Answer: Water in the boiler
QUESTION
Bottom blow down valves are provided for both steam and hot water, true or false? Answer: True
QUESTION
Safety valves or SRV's should be manually tested at least? Answer: Quarterly, every 90 days
QUESTION
The low water cut off is one of the most important electrical/mechanical devices on your boiler, how often should it be tested? Answer: Monthly
QUESTION
On a hot water boiler, the control called the operator will? Answer: On temperature decrease=start, on temperature increase=stop
QUESTION
On a steam boiler, what is a siphon or pig tail used for? Answer: To protect the steam gauge from too high of a temperature
QUESTION
What is one reason causing the expansion tank to fill with water? Answer: Air leaks out by the gauge glass fittings
QUESTION
What would you do if you came into the boiler room and found no water in the boiler? Answer: Shut off the burner and allow the burner to cool
QUESTION
The most dangerous action the boiler operator can take when a dangerously low water condition exists is to? Answer: Add water to the boiler
QUESTION
What is the purpose of the bottom blow down on a steam boiler? Answer: To remove sludge and sediment and to drain the boiler
QUESTION
How should you open a blow off valve? Answer: Slowly
QUESTION
How do you cool a boiler? Answer: Slowly
QUESTION
What is the combustion called when soot and smoke are formed? Answer: Incomplete
QUESTION
What is the result of soot and smoke being formed? Answer: Loss of efficiency
QUESTION
What is the combustion process using the theoretical amount of air? Answer: Perfect
QUESTION
A 40hp boiler can be left unattended for? Answer: 24hrs
QUESTION
A 25hp boiler can be left unattended for Answer: 24hrs
QUESTION
How are cast iron sectional boilers held together? Answer: Bolts
QUESTION
At what pressure do you need two blowoff valves? Answer: 100psi
QUESTION
Who is responsible for the boiler inspection? Answer: Owner/engineer
QUESTION
Under 200hp, how often do you check low water cutoff? Answer: Depends on the type of boiler
QUESTION
What is the minimum graduation of a pressure gauge? Answer: 1.5 times setting of the safety valve
QUESTION
What is combustion? Answer: Oxygen combined with an element that results in heat
QUESTION
Minimum information in the log book? Answer: Who, what and when
QUESTION
What is the formula for efficiency? Answer: Output divided by input
QUESTION
What device is used to remove air and condensate? Answer: Steam trap
QUESTION
What are the three ways that heat transfers? Answer: Conduction, convection and radiation
QUESTION
What is required on the low water cutoff on a hot water boiler? Answer: Manual reset
QUESTION
What will increase efficiency? Answer: High Btu fuel and reduce soot and scale
QUESTION
What is an economizer and where is it located? Answer: Pre heats water, after boiler exit
QUESTION
What is a preheater? Answer: Preheats combustion air
QUESTION
What is a pyrometer? Answer: Temperature sensing device
QUESTION
What is latent heat? Answer: The heat required to change the state of matter without changing temperature.
QUESTION
Which tubes in a boiler are the easiest to change? Answer: Fire tubes
QUESTION
If the pressure increases inside a boiler what also increases? Answer: Boiling point
QUESTION
If pressure decreases inside a boiler what will increase? Answer: Volume
QUESTION
How does the low water cut off protect an auto fired boiler? Answer: Shuts the burner down
QUESTION
What will cause a furnace explosion? Answer: Excess fuel and a source of ignition
QUESTION
After blowing down the gauge glass and observing the water reentering the glass, you are looking for? Answer:
The water level to rise quickly and stop at the previous level
QUESTION
Where would an exemption certificate be posted? Answer: Boiler room
QUESTION
A low water cut out or trip off will operate when the water level is? Answer: Slightly below normal
QUESTION
As you look at the gauge glass, if a pencil is placed on the other side looking through the water, the pencil will appear? Answer: Distorted/broken
QUESTION
An expansion tank would be used on which type of boiler? Answer: Hot water
QUESTION
Where would you find a sail switch?
Answer: Air leaks out by the upper gauge glass fitting?
QUESTION
On a steam boiler, what is the purpose of the siphon? Answer: To change the steam to water and protect the steam gauge/controls
QUESTION
How would you use tri-cocks? Answer: Start at the bottom and work up
QUESTION
What are three reasons for the bottom blow down on any boiler? Answer: To drain the boiler, to remove mud, to remove sludge
QUESTION
During operation of a boiler, if you cannot find water in the boiler you should? Answer: Shut off the burner
QUESTION
What is the purpose of the low water cut out on a boiler?
Answer: To shut off the burner
QUESTION
An apprentice engineer must have what kind of license? Answer: Special
QUESTION
An altitude gauge would be used on a? Answer: Hot water boiler
QUESTION
Boiler crosses are used on what connections? Answer: Water column
QUESTION
A gauge glass would be used on what kind of boiler? Answer: Steam boiler
QUESTION
Why would a relief valve on a hot water boiler be tested at the factory on steam first, then on the water set pressure?
A low limit control will keep the burner on low fire until the water temperature in the boiler has reached? Answer: 150 degrees
QUESTION
What device should be installed on a hot water boiler to alert operator that raw water is being taken on? Answer: Water meter
QUESTION
If a hot water boiler became low on water would the pressure relief valve open to prevent an explosion when the pressure increased? Answer: Yes, it would operate at its set pressure
QUESTION
What is the device that prevents thermal shock in a hydronic boiler? Answer: Low limit control
QUESTION
Expansion tanks that operate at high pressures must be built according to what section of the A.S.M.E.? Answer: VIII
QUESTION
If a hot water boiler has a pressure reducing (make-up) valve, what should be attached on the boiler side of the valve? Answer: Relief valve
QUESTION
High temperature hot water can be converted to steam by using a? Answer: Heat exchange
QUESTION
Hot water boilers using anti-freeze must have inhibitors added and be of? Answer: Ethylene glycol base
QUESTION
What should the concentration of the ethylene glycol base antifreeze be? Answer: At least 33% but not more than 66%
QUESTION
What is the purpose of the runaround pump? Answer:
