Docsity
Docsity
Prepare for your exams
Prepare for your exams

Study with the several resources on Docsity

Earn points to download
Earn points to download

Earn points by helping other students or get them with a premium plan

Guidelines and tips
Guidelines and tips
Sell on Docsity
Sell on Docsity
Docsity AI
Docsity AI
Log inSign up

Prepare for your exams

Study with the several resources on Docsity

Find documents

Prepare for your exams with the study notes shared by other students like you on Docsity

Search for your university

Find the specific documents for your university's exams

Docsity AINEW

Summarize your documents, ask them questions, convert them into quizzes and concept maps

Explore questions

Clear up your doubts by reading the answers to questions asked by your fellow students

Earn points to download

Earn points by helping other students or get them with a premium plan

Share documents
download point icon20 Points

For each uploaded document

Answer questions
download point icon5 Points

For each given answer (max 1 per day)

All the ways to get free points
Get points immediately

Choose a premium plan with all the points you need

Study Opportunities

Choose your next study program

Get in touch with the best universities in the world. Search through thousands of universities and official partners

Community

Ask the community

Ask the community for help and clear up your study doubts

Free resources

Our save-the-student-ebooks!

Download our free guides on studying techniques, anxiety management strategies, and thesis advice from Docsity tutors

Maryland Stationary Engineer Grade 1 Exam 2026 – 100% Actual Exam Q&A | High Pressure Boi, Exams of Boiler Design and Material

Baltimore City Community CollegeBoiler Design and Material

Pass the Maryland Grade 1 Exam on your first try. This 2026 guide contains 100 actual exam-style questions covering unlimited horsepower operations, Maryland State Boiler Laws, and ASME safety standards. Fully updated for the 2026 testing cycle Maryland Grade 1 Exam Stationary Engineer License MD Maryland Boiler License 2026 High Pressure Boiler Exam Questions Maryland Dept of Labor Stationary Engineer Stationary Engineering Grade 1 Study Material

Typology: Exams

2025/2026

Available from 04/27/2026

Nursingexamhub
Nursingexamhub 🇺🇸

1

(3)

733 documents

1 / 19

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
Maryland Stationary Engineer Grade 1 Exam
2026 – 100% Actual Exam Q&A | High-
Pressure Boiler Study Guide & Verified
Answers
Part 1: Boiler Theory & Construction (Questions 1-25)
1. Which type of boiler has the water inside the tubes with heat and gases of combustion
circulating around them?
A) Firetube
B) Watertube
C) Cast iron sectional
D) Scotch Marine
Explanation: Watertube boilers are designed for high-pressure applications because
the smaller diameter tubes can withstand higher internal pressures.
2. A "Grade 1" Maryland license allows the holder to operate boilers of what maximum
horsepower?
A) 500 HP
B) 1,000 HP
C) 5,000 HP
D) Unlimited
Explanation: The Grade 1 license is the highest Maryland tier and has no horsepower
restrictions.
3. What is the standard temperature for a "High-Temperature Hot Water" boiler?
A) Over 120°F
B) Over 212°F
C) Over 250°F
D) Under 200°F
Explanation: Per ASME and MD state code, high-temperature hot water boilers
operate at temperatures over 250°F or pressures over 160 psi.
4. The heating surface of a boiler is measured on which side?
A) The insulation side
B) The side exposed to the fire or hot gases
C) The outer casing
D) The top half only
pf3
pf4
pf5
pf8
pf9
pfa
pfd
pfe
pff
pf12
pf13

Partial preview of the text

Download Maryland Stationary Engineer Grade 1 Exam 2026 – 100% Actual Exam Q&A | High Pressure Boi and more Exams Boiler Design and Material in PDF only on Docsity!

Maryland Stationary Engineer Grade 1 Exam

2026 – 100% Actual Exam Q&A | High-

Pressure Boiler Study Guide & Verified

Answers

Part 1: Boiler Theory & Construction (Questions 1-25)

  1. Which type of boiler has the water inside the tubes with heat and gases of combustion circulating around them? A) Firetube B) Watertube C) Cast iron sectional D) Scotch Marine Explanation: Watertube boilers are designed for high-pressure applications because the smaller diameter tubes can withstand higher internal pressures.
  2. A "Grade 1" Maryland license allows the holder to operate boilers of what maximum horsepower? A) 500 HP B) 1,000 HP C) 5,000 HP D) Unlimited Explanation: The Grade 1 license is the highest Maryland tier and has no horsepower restrictions.
  3. What is the standard temperature for a "High-Temperature Hot Water" boiler? A) Over 120°F B) Over 212°F C) Over 250°F D) Under 200°F Explanation: Per ASME and MD state code, high-temperature hot water boilers operate at temperatures over 250°F or pressures over 160 psi.
  4. The heating surface of a boiler is measured on which side? A) The insulation side B) The side exposed to the fire or hot gases C) The outer casing D) The top half only

Explanation: Boiler heating surface is defined as the area that has water on one side and hot gases on the other.

  1. What type of stay is used to support the flat surfaces of a firetube boiler? A) Tension stay B) Staybolt C) Diagonal stay D) Through-stay Explanation: Staybolts are commonly used to support flat plates against internal pressure, especially in water-leg areas.
  2. What is the latent heat of evaporation for water at atmospheric pressure? A) 144 BTUs B) 180 BTUs C) 970.3 BTUs D) 1,150 BTUs Explanation: It takes 970.3 BTUs to change 1 lb of water at 212°F to 1 lb of steam at 212°F.
  3. In a watertube boiler, the mud drum is located at: A) The highest point of the boiler B) The lowest point of the water side C) Inside the steam drum D) Behind the burner Explanation: The mud drum (lower drum) acts as a collection point for sediment and sludge to be blown down.
  4. Which ASME Code section governs the construction of High-Pressure Power Boilers? A) Section I B) Section IV C) Section VI D) Section VIII Explanation: Section I is for boilers operating over 15 psi steam or 160 psi water.
  5. A furnace explosion is caused by a buildup of: A) Too much water B) Unburned fuel and air C) Scale on tubes D) Nitrogen Explanation: Furnace explosions (puff-backs) occur when fuel accumulates and ignites suddenly in the combustion chamber.
  1. What is "caustic embrittlement"? A) Scaling of the tubes B) Metal cracking due to high alkaline concentration and stress C) Rusting of the casing D) High furnace temperature Explanation: This is a serious metallurgical failure often caused by poor water chemistry.
  2. A boiler horsepower is defined as the evaporation of how many pounds of water per hour? A) 10 lbs B) 34.5 lbs C) 100 lbs D) 500 lbs Explanation: One BHP is the evaporation of 34.5 lbs of water from and at 212°F.
  3. The blowdown pipe on a high-pressure boiler must be: A) Made of copper B) Extra-heavy (Schedule 80) steel C) Galvanized D) Plastic Explanation: Maryland code requires heavy-duty piping for blowdown lines due to the shock and pressure involved.
  4. What is the density of water at standard conditions? A) 10 lbs/gal B) 8.33 lbs/gal C) 62.4 lbs/gal D) 7.5 lbs/gal Explanation: 1 gallon of water weighs approximately 8.33 lbs.
  5. Which device increases the temperature of the steam above its saturation point? A) Economizer B) Superheater C) Deaerator D) Air preheater Explanation: Superheaters add sensible heat to dry steam to increase plant efficiency.
  6. A "packaged" boiler is one that: A) Arrives in pieces B) Is factory-assembled and shipped as a unit

C) Only uses oil D) Is built on-site Explanation: Packaged boilers are complete with burner and controls from the factory.

  1. The "steam space" of a boiler is: A) The piping system B) The volume of the drum not occupied by water C) The furnace area D) The chimney Explanation: Sufficient steam space is required to allow for steam separation and to handle load swings.
  2. What is the function of a "baffle" in a boiler? A) To stop the burner B) To direct the flow of hot gases for maximum heat transfer C) To strengthen the drum D) To silence the exhaust Explanation: Baffles force gases to make multiple passes across the heating surfaces.
  3. The most common type of firetube boiler used in modern facilities is the: A) Vertical tubeless B) Scotch Marine C) HRT (Horizontal Return Tubular) D) Locomotive Explanation: Scotch Marine boilers are efficient, compact, and widely used for heating and process steam.
  4. A "fusible plug" is designed to melt in the event of: A) High pressure B) Low water C) High fuel pressure D) Low air flow Explanation: Melting of the plug allows steam to enter the furnace, alerting the operator to a dangerous low-water condition.
  5. The maximum allowable working pressure (MAWP) is determined by: A) The operator B) The manufacturer and an authorized inspector C) The fuel type D) The height of the stack

C) Notify the authorized inspector and repair/replace it D) Plug the discharge Explanation: Never "gag" or tighten a leaking safety valve; it must be professionally serviced.

  1. The "Blowback" of a safety valve is: A) The exhaust gas B) The difference between the opening and closing pressures C) A leak in the seat D) The steam header pressure Explanation: Blowback ensures the valve doesn't "chatter" by allowing pressure to drop significantly before closing.
  2. What does a "Flame Safeguard" system monitor? A) Water level B) The presence of a pilot or main flame C) Stack temperature D) Fuel level Explanation: If the flame goes out, the safeguard shuts off fuel to prevent a furnace explosion.
  3. A "Hard Manual Reset" is required on which device? A) The burner switch B) The high-limit pressure control C) The feedwater pump D) The draft fan Explanation: High-limit controls are safety devices that require human intervention to ensure the cause of the trip is investigated.
  4. A "Try-cock" is used to: A) Start the burner B) Manually check the water level in the gauge glass C) Test the fuel D) Vent air Explanation: Try-cocks provide a secondary manual verification of water levels if the glass is obscured.
  5. The safety valve capacity is measured in: A) PSI B) Pounds of steam per hour (lb/hr) C) Gallons

D) Horsepower Explanation: The valve must be able to discharge all the steam the boiler can produce at high fire.

  1. An "Interlock" is a device that: A) Speeds up the pump B) Prevents the burner from starting unless specific conditions are met C) Locks the boiler room door D) Connects two boilers Explanation: Examples include low-gas pressure, high-limit, and airflow switches.
  2. The "Purge" cycle in a boiler start-up: A) Cleans the water B) Removes combustible gases from the furnace before ignition C) Heats the fuel oil D) Blows down the mud drum Explanation: This prevents igniting any fuel that may have leaked into the furnace while the burner was off.
  3. "Carryover" is dangerous because it leads to: A) High fuel bills B) Water hammer and damage to turbines or piping C) Low steam pressure D) Excessive draft Explanation: Carryover is when water droplets leave the boiler with the steam.
  4. What is the minimum number of safety valves required on a boiler with over 500 sq. ft. of heating surface? A) 1 B) 2 or more C) 3 D) 5 Explanation: Section I ASME Code requires at least two safety valves for larger boilers.
  5. A "Hydrostatic Test" is performed at: A) Operating pressure B) 1.5 times the MAWP C) 100 psi D) 5 times the MAWP

C) To measure flow D) To stop the pump Explanation: It is a one-way valve.

  1. A "Non-Return Valve" is located: A) On the fuel line B) On the steam outlet (main header) C) At the pump D) In the chimney Explanation: It acts as a check valve for the steam header, preventing backflow from other boilers.
  2. If the water level is lost from the gauge glass, the FIRST action is: A) Add water immediately B) Shut off the fuel to the burner C) Open the safety valve D) Call the manager Explanation: Adding water to a hot, dry boiler can cause an explosion. Secure the fire first.
  3. What type of fire extinguisher is used for an oil-fired boiler room fire? A) Water (Class A) B) B-C or A-B-C (Dry Chemical/CO2) C) Sand D) Foam only Explanation: Oil fires are Class B.
  4. The "Operating Range" of a boiler is the: A) Total height B) Pressure difference between the cut-in and cut-out points C) Fuel types it can use D) Distance to the stack Explanation: This is often called the "differential."

Part 3: Water Treatment & Chemistry (Questions 51-75)

  1. Scale in a boiler is primarily caused by: A) Oxygen B) Calcium and Magnesium (Hardness) C) Nitrogen D) Oil

Explanation: Hard water minerals precipitate out of the water when heated, forming a hard scale on tubes.

  1. "Pitting" on the water side of a boiler is usually caused by: A) High pH B) Oxygen and Carbon Dioxide corrosion C) Too many chemicals D) Low temperature Explanation: Dissolved oxygen in the feedwater attacks the metal, creating small pits.
  2. What chemical is added to the boiler to remove dissolved oxygen? A) Phosphates B) Sodium Sulfite (or Hydrazine) C) Caustic Soda D) Chlorine Explanation: Sodium sulfite acts as an oxygen scavenger.
  3. The alkalinity of boiler water is measured by: A) A thermometer B) The pH scale C) A pressure gauge D) A hydrometer Explanation: A pH of 7 is neutral; boilers are usually kept in the 10-11 range to prevent corrosion.
  4. "Priming" in a boiler is: A) Starting the pump B) Slug of water entering the steam line C) High fuel pressure D) Heating the fuel Explanation: Often caused by high water levels or high chemical concentration.
  5. Continuous blowdown is used to control: A) Sludge at the bottom B) Total Dissolved Solids (TDS) or conductivity C) Oil in the furnace D) Water level Explanation: It removes a small, steady amount of concentrated water from the surface.
  6. A "Deaerator" (DA Tank) is used to: A) Store fuel
  1. Why is "Phosphate" added to boiler water? A) To kill bacteria /B) To keep scale-forming minerals in a soft, fluid sludge C) To remove air D) To dye the water Explanation: Phosphates condition the hardness so it can be removed via blowdown.
  2. "External" water treatment happens: A) Inside the boiler B) Before the water enters the boiler C) In the chimney D) At the radiator Explanation: Examples include softeners, dealkalizers, and deaerators.
  3. A "Conductivity Meter" is used to test for: A) Heat B) Dissolved solids in the water C) Electricity in the pipes D) Steam flow Explanation: Higher TDS levels allow water to conduct more electricity.
  4. What is the boiling point of water at 100 psi gauge pressure? A) 212°F B) 338°F C) 450°F D) 100°F Explanation: Boiling temperature increases as pressure increases (refer to steam tables).
  5. "Foaming" on the surface of the boiler water is often caused by: A) Low water level B) High concentration of dissolved solids or alkalinity C) Clean water D) Low pressure Explanation: Excessive impurities increase surface tension, causing bubbles to form.
  6. What chemical is used to control the pH of the condensate return lines? A) Sulfite B) Amines C) Phosphate

D) Brine Explanation: Neutralizing amines prevent corrosion in the return piping.

  1. "Internal" water treatment refers to: A) The softener B) Chemicals added directly to the boiler or feedwater C) Painting the tubes D) Fixing the burner Explanation: Internal treatment deals with impurities that get past the external systems.
  2. High water levels in a steam boiler can cause: A) Furnace explosion B) Moisture carryover into steam lines C) Higher efficiency D) The safety valve to lift Explanation: There is less room for the steam to separate from the water.
  3. A "Titration" test is used to: A) Measure weight B) Determine the concentration of a specific chemical in the water C) Measure flue gas D) Check the draft Explanation: Drops of a reagent are added until a color change occurs.
  4. Hard scale can cause a tube to: A) Shrink B) Rupture or "bag" C) Become stronger D) Freeze Explanation: The metal overheats because the water can't cool it.
  5. If the feedwater temperature is 212°F, the DA tank pressure is approximately: A) 100 psi B) 0 to 5 psi C) 50 psi D) Vacuum Explanation: DA tanks operate at low positive pressure to prevent air from entering.
  6. Cold water "shocking" a hot boiler can cause: A) Scale B) Thermal stress and leaking at the tube sheets C) Higher pressure
  1. One BTU is the amount of heat required to raise: A) 1 gal of water 1°F B) 1 lb of water 1°F C) 1 lb of water 212°F D) 1 ton of water 1°F Explanation: The British Thermal Unit is the standard measure of heat energy.
  2. The "Flash Point" of fuel oil is: A) The temperature it boils B) The lowest temperature at which it produces an ignitable vapor C) The temperature it freezes D) The color of the oil Explanation: Flash point is a critical safety measurement for storage.
  3. "Incomplete combustion" produces which dangerous gas? A) Carbon Dioxide B) Carbon Monoxide /C) Oxygen D) Nitrogen Explanation: CO is a poisonous gas and indicates a lack of sufficient air (oxygen).
  4. What happens if the burner has "Too much excess air"? A) The fire goes out B) Heat is wasted out the stack C) The water level drops D) Scale forms Explanation: Excess air cools the furnace and carries heat away.
  5. A "Soot Blower" is used to clean: A) The water side B) The fire side of the tubes C) The fuel tank D) The floor Explanation: It uses steam or air to blast away soot, which is an insulator.
  6. When taking a boiler "off-line" for a long period, it should be: A) Left full of air B) Laid up "wet" or "dry" to prevent corrosion C) Painted D) Left at half-pressure

Explanation: Lay-up procedures involve removing oxygen or filling with nitrogen/desiccant.

  1. A steam pressure gauge calibrated in PSIA includes: A) Only boiler pressure B) Atmospheric pressure (approx. 14.7 psi) C) Water pressure D) Vacuum only Explanation: PSIA = PSIG + 14.7.
  2. If a steam valve is opened too quickly, it can cause: A) Higher efficiency B) Water hammer and potential pipe rupture C) Low water D) Air in the boiler Explanation: Rapid flow causes slugs of condensate to smash into fittings.
  3. A "Globe Valve" should be installed so that the pressure is: A) On top of the disc B) Under the disc C) On the side D) It doesn't matter Explanation: This allows the valve to be packed while under pressure (with the valve closed).
  4. The "Safety Factor" for a boiler is the: A) Speed of the fan B) Ratio of the bursting pressure to the MAWP C) Number of operators D) Height of the building Explanation: Most boilers have a safety factor of 4 or 5.
  5. Sensible heat is heat that: A) Can't be felt B) Causes a change in temperature but not state C) Causes a change in state but not temperature D) Is only found in steam Explanation: Heating water from 60°F to 211°F is adding sensible heat.
  6. What is the approximate heating value of #2 fuel oil? A) 100,000 BTU/gal B) 140,000 BTU/gal

B) Steam at a temperature corresponding to its pressure C) Superheated D) Dirty Explanation: Saturated steam is "on the line" between water and steam.

  1. A "Steam Trap" is designed to: A) Trap steam B) Remove condensate and air from steam lines without losing steam C) Measure steam D) Vent the boiler Explanation: Traps ensure only dry steam reaches the equipment.
  2. If you hear a loud "thumping" in the steam lines, you should suspect: A) Low pressure B) Water hammer C) High fuel flow D) Scale Explanation: Water hammer is caused by steam moving water slugs at high velocity.