Building Utility Systems Flashcards

A hospital's emergency electrical system is divided into three branches per NFPA 99. Which load is served by the critical branch?

Answer: Task illumination in operating rooms and selected receptacles

The critical branch serves task illumination in operating and delivery rooms, anesthesia equipment, and selected receptacles in critical care areas per NFPA 99.

Which piping material is most commonly used for medical vacuum systems in modern healthcare construction due to its cleanliness and resistance to corrosion?

Answer: Type K copper

Type K copper is the standard for medical vacuum and gas piping because it is clean, corrosion-resistant, and meets NFPA 99 requirements for medical gas systems.

In a building automation system (BAS), what is the function of a direct digital controller (DDC)?

Answer: Execute local control logic and communicate with sensors and actuators

A DDC executes programmed control sequences locally at the field level, reading sensors and modulating actuators without depending on a central server.

A healthcare facility manager must select a pump configuration that allows continued operation if one pump fails. Which arrangement is appropriate?

Answer: Two pumps in parallel, each sized for full design flow

Two parallel pumps each sized for 100% design flow provides full redundancy — one pump continues full-capacity operation if the other fails.

What is the primary purpose of an expansion tank in a closed hydronic heating or cooling system?

Answer: Absorb pressure fluctuations caused by thermal expansion of water

An expansion tank accommodates the volume change of water as it heats or cools, preventing excessive pressure buildup that could damage system components.

Under NFPA 13, what is the minimum distance a standard spray sprinkler head must be located from a wall?

Answer: 4 inches

NFPA 13 requires standard spray sprinklers to be located a minimum of 4 inches from a wall to ensure proper spray pattern distribution.

A hospital facility manager is selecting a transformer for a new electrical distribution panel. What does 'K-factor' rating mean for a transformer?

Answer: Ability to handle harmonic currents from nonlinear loads

A K-factor rated transformer is designed to handle harmonic currents produced by nonlinear loads such as variable frequency drives and computer equipment without overheating.