WALMART MAINTENANCE Building Systems 2

Question 1

What is the primary purpose of a building's vapor barrier in wall assemblies?

Accepted Answer

To prevent moisture migration into wall cavities

Answer

Vapor barriers prevent moisture-laden air from migrating into wall cavities where condensation could cause mold and structural damage.

Question 2

In a commercial building's electrical panel, what does a 'double-pole' breaker protect?

Accepted Answer

A single 240V circuit

Answer

Double-pole breakers occupy two slots in the panel and protect a single 240V circuit by interrupting both hot legs simultaneously.

Question 3

Which type of pipe fitting is used to connect two pipes of different diameters in a plumbing system?

Accepted Answer

Reducer

Answer

A reducer (or reducing coupling) connects pipes of two different diameters while maintaining the flow direction.

Question 4

What does HVAC stand for in building systems terminology?

Accepted Answer

Heating, Ventilation, and Air Conditioning

Answer

HVAC stands for Heating, Ventilation, and Air Conditioning — the system responsible for climate control in buildings.

Question 5

A rooftop HVAC unit is not cooling adequately. What should you check first?

Accepted Answer

Condenser and evaporator coil cleanliness

Answer

Dirty coils are the most common cause of reduced cooling capacity and should be checked before more involved diagnostics.

WALMART MAINTENANCE Practice Test