AFE Building Systems & Maintenance 5

Question 1

What is the function of a building's expansion tank in a closed hydronic heating system?

Accepted Answer

Absorb pressure fluctuations caused by thermal expansion of water to prevent system damage

Answer

An expansion tank contains a pressurized air or diaphragm bladder that accommodates the volume increase of water as it heats, preventing excessive pressure rise in the closed loop.

Question 2

Which OSHA standard applies to lockout/tagout (LOTO) procedures for controlling hazardous energy during maintenance on building equipment?

Accepted Answer

29 CFR 1910.147

Answer

29 CFR 1910.147, the Control of Hazardous Energy standard, requires written LOTO procedures, authorized employee training, and periodic inspections for servicing equipment.

Question 3

A facility's emergency generator fails to start during a monthly load test. The technician finds the battery voltage is adequate but the starter motor does not engage. What is the most likely fault?

Accepted Answer

Faulty starter solenoid or relay preventing the starter circuit from completing

Answer

A failed starter solenoid or relay prevents the high-current starter circuit from energizing even when the control battery voltage is sufficient.

Question 4

In a building envelope assessment, what does a high air leakage result from a blower door test indicate?

Accepted Answer

Significant uncontrolled infiltration pathways that increase heating and cooling loads

Answer

High blower door test results (CFM50 or ACH50) indicate leaky building envelopes where uncontrolled air infiltration adds significant heating, cooling, and humidity control loads.

Question 5

A steam trap fails in the open position. What is the most immediate operational consequence?

Accepted Answer

Live steam blows through continuously, causing significant energy loss

Answer

An open-failed steam trap allows live steam to pass continuously to the condensate return, resulting in direct energy waste and potential damage to condensate equipment.

(AFE) Association for Facilities Engineering Certification Practice Test

(AFE) Association for Facilities Engineering Certification Practice Test

AFE Building Systems & Maintenance 5