License Exam Guide Latest Update Questions and Verified

Minnesota Special Engineer Boiler License Exam Guide (Latest Update 2025 / 2026) | Questions and Verified Answers | 100% Correct

Exam Guide for MHS Custodians

Question:

What is the science of thermal energy and how it transforms to and from other forms of energy?

Answer:

Thermodynamics

Question:

What is the movement of heat from one material to another?

Answer:

Heat transfer

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Question:

What is the type of air supplied to a burner to mix directly with gas?

Answer:

Primary air

Question:

What is the air supplied to the furnace to control combustion efficiency?

Answer:

Secondary air

Question:

What is the air supplied to burner above theoretical amount required to burn fuel to ensure complete combustion?

Answer:

Excess air

Question:

How much air is required to burn 1lb of fuel?

Answer:

14-15lbs of air 2 / 4

Question:

This system provides proper amount of water to the burner.

Answer:

Feedwater system

Question:

This system provides fuel for combustion to produce the necessary heat in the boiler.

Answer:

Fuel system

Question:

This system regulates flow of air to and from the burner.

Answer:

Draft system

Question:

The maximum allowable working pressure in lbs per square inch at which a boiler can safely operate is called?

Answer:

Maximum allowable working pressure (MAWP) 3 / 4

Question:

What increases as the pressure increases inside the boiler?

Answer:

Boiling point of water

Question:

The pressure caused by the weight of air surrounding the earth.

Answer:

Atmospheric pressure

Question:

Heat and gases of combustion pass through tubes surrounded by water in what type of boiler?

Answer:

Firetube

Question:

Water passes through tubes surrounded by gases of combustion in what type of boiler?

Answer:

Water tube boilers

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