MINNESOTA SPECIAL ENGINEER – BOILER LICENSE SAFE OPERATION FUNDAMENTALS
1. What is the definition of a 'boiler' under Minnesota Statute Chapter 183?
A - A closed vessel in which water is heated, steam is generated, steam
is superheated, or any combination thereof, under pressure or vacuum
for use external to itself. ✓ CORRECT
B - Any open tank used to heat water for domestic use.
C - A heat exchanger used only for space heating.
D - A pressure vessel used solely to store compressed air.
2. A 'low-pressure steam boiler' in Minnesota is defined as a boiler
operating at a maximum allowable working pressure (MAWP) of:
A - Not more than 15 psig. ✓ CORRECT
B - Not more than 30 psig.
C - Not more than 50 psig.
D - Not more than 100 psig.
3. A 'high-pressure boiler' is defined as a steam boiler operating above:
A - 50 psig.
B - 15 psig. ✓ CORRECT
C - 30 psig.
D - 100 psig.
4. A 'hot water heating boiler' operates at water temperatures not
exceeding:
, A - 250°F and pressures not exceeding 160 psig. ✓ CORRECT
B - 212°F and pressures not exceeding 15 psig.
C - 200°F at any pressure.
D - 300°F and pressures not exceeding 250 psig.
5. Which code governs the construction and inspection of most power
boilers in the United States?
A - ASME Boiler and Pressure Vessel Code, Section I. ✓ CORRECT
B - NFPA 85 Boiler and Combustion Systems Hazards Code.
C - API Standard 510.
D - Minnesota Rules Chapter 5225.
6. The term 'MAWP' stands for:
A - Maximum Allowable Working Pressure. ✓ CORRECT
B - Minimum Acceptable Water Pressure.
C - Maximum Actual Working Point.
D - Monitored Authorized Water Pressure.
7. What does the 'nameplate' on a boiler indicate?
A - The ASME code stamp, MAWP, heating surface, and manufacturer
data. ✓ CORRECT
B - Only the manufacturer's name and serial number.
C - The fuel type and burner model.
D - The installation date and inspector's signature.
8. A boiler's 'factor of safety' refers to:
A - The ratio of the ultimate strength of the material to the allowable
working stress. ✓ CORRECT
B - The ratio of steam output to fuel input.
C - The minimum water level required for safe operation.
D - The safety valve discharge capacity.
9. The term 'horsepower' as applied to boilers (boiler horsepower) is
equivalent to:
A - Evaporating 34.5 lb of water per hour from and at 212°F. ✓
CORRECT
B - 550 ft-lb of work per second.
, C - 1,000 BTU per hour of heat output.
D - Generating 10 psig of steam pressure.
10. Which of the following best describes a 'fire-tube boiler'?
A - Hot combustion gases pass through tubes surrounded by water. ✓
CORRECT
B - Water passes through tubes surrounded by combustion gases.
C - Steam is generated by electrical resistance elements.
D - Heat is transferred by radiation only, with no tubes.
11. In a 'water-tube boiler':
A - Water circulates through tubes while hot gases surround the
outside. ✓ CORRECT
B - Combustion gases travel through tubes submerged in water.
C - Only saturated steam is produced.
D - Water is heated in a single large drum.
12. The 'steam drum' in a water-tube boiler serves primarily to:
A - Separate steam from water and provide steam storage. ✓ CORRECT
B - Superheat the steam before use.
C - Remove dissolved solids from feedwater.
D - Control combustion air flow.
13. What is 'blowdown' in boiler operation?
A - The removal of water and dissolved solids from the boiler to control
water quality. ✓ CORRECT
B - The emergency venting of excess steam.
C - The process of draining the boiler for maintenance.
D - The purging of combustion gases before ignition.
14. A 'scotch marine' boiler is a type of:
A - Fire-tube boiler with an internal furnace. ✓ CORRECT
B - Water-tube boiler used exclusively on ships.
C - Once-through steam generator.
D - Electrode boiler.
15. The 'heating surface' of a boiler is defined as:
, A - The surface area exposed to heat or products of combustion on one
side and water or steam on the other. ✓ CORRECT
B - The total exterior surface area of the boiler shell.
C - Only the area of the furnace floor.
D - The cross-sectional area of the steam outlet.
16. What is 'carryover' in a steam boiler?
A - The entrainment of water droplets or impurities in steam leaving the
boiler. ✓ CORRECT
B - Steam that escapes through a leaking safety valve.
C - Excess heat that passes out of the stack.
D - The overflow of condensate return.
17. 'Priming' in a boiler refers to:
A - Violent surging of water into the steam space, causing wet steam. ✓
CORRECT
B - The pre-heating of feedwater before it enters the boiler.
C - The initial startup procedure for a cold boiler.
D - The application of a protective coating to the boiler interior.
18. What is 'foaming' in a steam boiler?
A - Formation of bubbles on the water surface caused by impurities,
which can lead to carryover. ✓ CORRECT
B - Corrosion of the boiler shell.
C - Overheating of the boiler tubes.
D - Air entrapment in the feedwater system.
19. The 'waterside' of a boiler refers to:
A - The surfaces in contact with water or steam inside the boiler. ✓
CORRECT
B - The location of the water supply connection.
C - The exterior surfaces exposed to weather.
D - The feedwater pump system.
20. What is a 'superheater'?
A - A heat exchanger that raises steam temperature above saturation
temperature at the same pressure. ✓ CORRECT
1. What is the definition of a 'boiler' under Minnesota Statute Chapter 183?
A - A closed vessel in which water is heated, steam is generated, steam
is superheated, or any combination thereof, under pressure or vacuum
for use external to itself. ✓ CORRECT
B - Any open tank used to heat water for domestic use.
C - A heat exchanger used only for space heating.
D - A pressure vessel used solely to store compressed air.
2. A 'low-pressure steam boiler' in Minnesota is defined as a boiler
operating at a maximum allowable working pressure (MAWP) of:
A - Not more than 15 psig. ✓ CORRECT
B - Not more than 30 psig.
C - Not more than 50 psig.
D - Not more than 100 psig.
3. A 'high-pressure boiler' is defined as a steam boiler operating above:
A - 50 psig.
B - 15 psig. ✓ CORRECT
C - 30 psig.
D - 100 psig.
4. A 'hot water heating boiler' operates at water temperatures not
exceeding:
, A - 250°F and pressures not exceeding 160 psig. ✓ CORRECT
B - 212°F and pressures not exceeding 15 psig.
C - 200°F at any pressure.
D - 300°F and pressures not exceeding 250 psig.
5. Which code governs the construction and inspection of most power
boilers in the United States?
A - ASME Boiler and Pressure Vessel Code, Section I. ✓ CORRECT
B - NFPA 85 Boiler and Combustion Systems Hazards Code.
C - API Standard 510.
D - Minnesota Rules Chapter 5225.
6. The term 'MAWP' stands for:
A - Maximum Allowable Working Pressure. ✓ CORRECT
B - Minimum Acceptable Water Pressure.
C - Maximum Actual Working Point.
D - Monitored Authorized Water Pressure.
7. What does the 'nameplate' on a boiler indicate?
A - The ASME code stamp, MAWP, heating surface, and manufacturer
data. ✓ CORRECT
B - Only the manufacturer's name and serial number.
C - The fuel type and burner model.
D - The installation date and inspector's signature.
8. A boiler's 'factor of safety' refers to:
A - The ratio of the ultimate strength of the material to the allowable
working stress. ✓ CORRECT
B - The ratio of steam output to fuel input.
C - The minimum water level required for safe operation.
D - The safety valve discharge capacity.
9. The term 'horsepower' as applied to boilers (boiler horsepower) is
equivalent to:
A - Evaporating 34.5 lb of water per hour from and at 212°F. ✓
CORRECT
B - 550 ft-lb of work per second.
, C - 1,000 BTU per hour of heat output.
D - Generating 10 psig of steam pressure.
10. Which of the following best describes a 'fire-tube boiler'?
A - Hot combustion gases pass through tubes surrounded by water. ✓
CORRECT
B - Water passes through tubes surrounded by combustion gases.
C - Steam is generated by electrical resistance elements.
D - Heat is transferred by radiation only, with no tubes.
11. In a 'water-tube boiler':
A - Water circulates through tubes while hot gases surround the
outside. ✓ CORRECT
B - Combustion gases travel through tubes submerged in water.
C - Only saturated steam is produced.
D - Water is heated in a single large drum.
12. The 'steam drum' in a water-tube boiler serves primarily to:
A - Separate steam from water and provide steam storage. ✓ CORRECT
B - Superheat the steam before use.
C - Remove dissolved solids from feedwater.
D - Control combustion air flow.
13. What is 'blowdown' in boiler operation?
A - The removal of water and dissolved solids from the boiler to control
water quality. ✓ CORRECT
B - The emergency venting of excess steam.
C - The process of draining the boiler for maintenance.
D - The purging of combustion gases before ignition.
14. A 'scotch marine' boiler is a type of:
A - Fire-tube boiler with an internal furnace. ✓ CORRECT
B - Water-tube boiler used exclusively on ships.
C - Once-through steam generator.
D - Electrode boiler.
15. The 'heating surface' of a boiler is defined as:
, A - The surface area exposed to heat or products of combustion on one
side and water or steam on the other. ✓ CORRECT
B - The total exterior surface area of the boiler shell.
C - Only the area of the furnace floor.
D - The cross-sectional area of the steam outlet.
16. What is 'carryover' in a steam boiler?
A - The entrainment of water droplets or impurities in steam leaving the
boiler. ✓ CORRECT
B - Steam that escapes through a leaking safety valve.
C - Excess heat that passes out of the stack.
D - The overflow of condensate return.
17. 'Priming' in a boiler refers to:
A - Violent surging of water into the steam space, causing wet steam. ✓
CORRECT
B - The pre-heating of feedwater before it enters the boiler.
C - The initial startup procedure for a cold boiler.
D - The application of a protective coating to the boiler interior.
18. What is 'foaming' in a steam boiler?
A - Formation of bubbles on the water surface caused by impurities,
which can lead to carryover. ✓ CORRECT
B - Corrosion of the boiler shell.
C - Overheating of the boiler tubes.
D - Air entrapment in the feedwater system.
19. The 'waterside' of a boiler refers to:
A - The surfaces in contact with water or steam inside the boiler. ✓
CORRECT
B - The location of the water supply connection.
C - The exterior surfaces exposed to weather.
D - The feedwater pump system.
20. What is a 'superheater'?
A - A heat exchanger that raises steam temperature above saturation
temperature at the same pressure. ✓ CORRECT
