Exam Questions And Correct Answers

Ohio Boiler Technician Level 1 Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2025|2026 Q&A | Instant Download Pdf

1. The primary function of a boiler is to:

• Burn fuel efficiently
• Produce steam or hot water
• Reduce water hardness
• Provide ventilation

Rationale: The main purpose of a boiler is to generate steam or hot water

for heating or power purposes.

• What is the standard safety device to prevent excessive pressure in a

boiler?

• Water gauge
• Pressure gauge 1 / 4

• Safety valve
• Feedwater regulator

Rationale: A safety valve is designed to release pressure automatically if it

exceeds safe limits.

• Which of the following is considered a low-pressure boiler?
• 250 psi
• 15 psi steam
• 100 psi steam
• 200 psi

Rationale: Low-pressure steam boilers typically operate at pressures not

exceeding 15 psi.

• The chemical commonly used to treat boiler water to prevent scale

formation is:

• Sodium hydroxide
• Phosphate
• Chlorine
• Sulfuric acid

Rationale: Phosphates help prevent scale by reacting with hardness ions to

form non-adherent sludge.

• Which of the following indicates a water level that is too low in a

boiler?

• Normal gauge reading 2 / 4

• Dry pipe or low water alarm
• Steady pressure
• Proper flame color

Rationale: Low water alarms or dry pipe conditions indicate insufficient

water, which can damage the boiler.

6. The purpose of a blowdown valve is to:

• Increase pressure
• Remove sediment and impurities
• Feed water into the boiler
• Control temperature

Rationale: Blowdown removes suspended solids and sludge to maintain

water quality.

• Which type of boiler uses a fire-tube design?
• Water-tube boiler
• Fire-tube boiler
• Electric boiler
• Solar boiler

Rationale: Fire-tube boilers have hot gases passing through tubes

surrounded by water.

8. A boiler’s feedwater pump is primarily used to:

• Remove sediment
• Supply water to the boiler 3 / 4

• Measure water level
• Vent steam

Rationale: The feedwater pump ensures that water enters the boiler to

maintain proper level and pressure.

9. The purpose of a boiler economizer is to:

• Increase water purity
• Recover heat from flue gases
• Prevent corrosion
• Control water level

Rationale: Economizers improve efficiency by preheating feedwater using

residual heat from flue gases.

• What is the recommended water treatment to control corrosion

in low-pressure boilers?

• Lime softening
• Oxygen scavengers
• Sodium hydroxide
• Sodium bicarbonate

Rationale: Oxygen scavengers remove dissolved oxygen that causes

corrosion in boilers.

• Which gauge measures the pressure inside a boiler?
• Thermometer
• Pressure gauge
• / 4