Mechanical, Electrical, and Plumbing (MEP) Systems Flashcards
7 cards from real Architecture and Design practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Mechanical, Electrical, and Plumbing (MEP) Systems flashcards as text
What is the primary purpose of a P-trap in a plumbing drain system?
Answer: To block toxic sewer gases from entering the building through the drain opening
The P-trap holds a water seal in its curved section that physically blocks sewer gases from rising through drain openings into the occupied space.
Which pipe material has become most commonly specified for hot and cold potable water supply in new US residential construction due to its flexibility and freeze resistance?
Answer: PEX (cross-linked polyethylene)
PEX has largely replaced copper in new residential construction due to its flexibility, resistance to freeze damage, ease of installation, and lower cost.
What is the minimum slope required for horizontal drain and waste pipes 3 inches or smaller in diameter per the International Plumbing Code?
Answer: 1/4 inch per foot
The IPC requires horizontal drains 3 inches and smaller to slope at least 1/4 inch per foot to maintain adequate flow velocity and self-cleaning action.
Which type of fire sprinkler system is most appropriate for unheated spaces or buildings where pipes may be exposed to freezing temperatures?
Answer: Dry pipe system
Dry pipe systems charge pipes with pressurized air rather than water; water enters only after a sprinkler head activates, preventing frozen pipes.
What is the function of a pressure-reducing valve (PRV) installed on a building's incoming water supply line?
Answer: To reduce excessive incoming water pressure to a safe level for building fixtures and piping
PRVs protect building plumbing, fixtures, and appliances from excessive municipal supply pressures that can cause damage and reduce equipment service life.
Per NFPA 101 (Life Safety Code), what is the maximum allowable exit access travel distance in a fully sprinklered business occupancy?
Answer: 250 feet
NFPA 101 permits a maximum 250-foot travel distance to an exit in sprinklered business occupancies, versus 200 feet in non-sprinklered buildings.
Which building system uses mechanical fans to maintain higher air pressure inside exit stairwells than in adjacent spaces during a fire, preventing smoke infiltration?
Answer: Stairwell pressurization system
Stairwell pressurization systems fan air into stairwells to maintain positive pressure relative to adjacent smoke-filled areas, keeping evacuation routes clear.