BAP BAP Combustion & Mechanical Systems 2

Question 1

In a forced-air heating system, what does a high temperature rise across the heat exchanger typically indicate?

Accepted Answer

Restricted airflow, often caused by a dirty filter or blocked ducts

Answer

A temperature rise above the manufacturer's specified range signals inadequate airflow, which stresses the heat exchanger and can lead to cracking and CO spillage.

Question 2

What does 'draft pressure' measure in a vented combustion appliance assessment?

Accepted Answer

The negative pressure in the flue that draws combustion gases upward and out

Answer

Draft pressure is the negative pressure measured in the flue or vent connector that indicates how effectively combustion gases are being expelled from the appliance.

Question 3

Which appliance type is MOST resistant to backdrafting caused by house depressurization?

Accepted Answer

Sealed-combustion condensing furnace

Answer

Sealed-combustion appliances draw combustion air directly from outside through a dedicated pipe, making them immune to backdrafting from indoor pressure changes.

Question 4

A BAP analyst finds that a gas water heater's pilot flame is yellow and lazy. What does this most likely indicate?

Accepted Answer

Insufficient combustion air or a partially blocked burner orifice

Answer

A yellow, lazy pilot flame indicates incomplete combustion due to insufficient air supply or a partially clogged orifice, which can produce elevated CO.

Question 5

What is the function of a barometric damper on an oil-fired boiler's flue?

Accepted Answer

To regulate draft and prevent excessive negative pressure in the flue

Answer

A barometric damper opens to admit room air into the flue, moderating excessive draft that could interfere with proper burner operation and efficiency.

(BAP) Building Analyst Professional Practice Test

(BAP) Building Analyst Professional Practice Test

BAP BAP Combustion & Mechanical Systems 2