AFE Building Systems & Maintenance 3

Question 1

A variable air volume (VAV) system reduces airflow to a zone when cooling demand drops. What risk does this create if not properly managed?

Accepted Answer

Inadequate outdoor air ventilation below ASHRAE 62.1 minimums

Answer

At minimum airflow positions, VAV boxes may supply less outdoor air than required, violating ASHRAE 62.1 ventilation standards and degrading indoor air quality.

Question 2

Which insulation material is most appropriate for a chilled water pipe operating at 42°F in a humid environment?

Accepted Answer

Fiberglass with vapor retarder jacket

Answer

Fiberglass with a continuous vapor retarder jacket prevents condensation on below-ambient piping by blocking moisture diffusion from the warm, humid surrounding air.

Question 3

What NFPA standard governs the inspection, testing, and maintenance of fire protection systems including sprinklers?

Accepted Answer

NFPA 25

Answer

NFPA 25 is the Standard for the Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems.

Question 4

A cooling tower's approach temperature is defined as:

Accepted Answer

The difference between leaving water temperature and ambient wet-bulb temperature

Answer

Approach temperature is the leaving water temperature minus the ambient wet-bulb temperature; a smaller approach indicates a more efficient tower.

Question 5

What is the correct torque sequence when retightening large flange bolts on a pressurized piping joint?

Accepted Answer

Sequential in a star or cross pattern to ensure even gasket compression

Answer

A star or cross-pattern torque sequence distributes load evenly across the gasket, preventing leaks caused by uneven compression or gasket deformation.

(AFE) Association for Facilities Engineering Certification Practice Test

(AFE) Association for Facilities Engineering Certification Practice Test

AFE Building Systems & Maintenance 3