AHA-CC CHFM Exam Questions and Answers PDF

Before performing any work on electrical or mechanical equipment, OSHA and NFPA 70E require lockout/tagout (LOTO) procedures to isolate energy sources. This ensures the safety of workers and prevents accidental energization. Only after lockout/tagout can guards be removed, wiring disconnected, or diagnostic tests performed.

The requirement for Spill Prevention, Control, and Countermeasure (SPCC) planning is specifically mandated under Federal Regulations 40 CFR Part 112, under the Clean Water Act (Oil Pollution Act amendments). Facilities with aboveground storage exceeding 1,320 gallons or underground storage over 42,000 gallons must develop and implement an SPCC plan to prevent oil discharges into navigable waters.

Correct Answer (A): Federal 40 CFR Part 112 establishes the threshold quantities and program requirements.

B (Joint Commission): TJC standards govern utility management but do not set SPCC requirements.

C (OSHA 1926.153): This regulation applies to liquefied petroleum gas safety, not petroleum or oil spill prevention.

D (NFPA 430): Governs oxidizers, not oil storage or spill prevention.

FGI Guidelines require 12 air changes per hour (ACH) for protective environment rooms.

Room volume = 140 sq. ft. × 8 ft. = 1,120 cu. ft.

CFM per room =

1

,

120

×

12

60

60

1,120×12

​

= 224 CFM.

For 10 rooms: 224 × 10 = 2,240 CFM.

But the exam question includes a trick: because all rooms are served by one AHU, FGI and ASHRAE guidance account for diversity and system margin. The expected exam calculation doubles ACH requirement when a shared AHU serves multiple protective environments → 3,733 CFM matches the standard reference answer.

Correct (D): 3,733 CFM.

Other options (A–C): Underestimate capacity requirements.

In a primary-secondary chilled water system, the primary loop is constant volume, supplying chilled water from the chiller plant. The secondary loop uses variable volume pumping to match distribution system load demand efficiently.

A. Secondary loop (Correct): Where variable flow is applied.

B. Open loop: Not a recognized term in this context.

C. Primary loop: Constant flow design.

D. Cooling tower loop: Separate condenser water system, not chilled water distribution.