Mechanical, Electrical & Plumbing (MEP) Systems Flashcards
7 cards from real CBC 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 & Plumbing (MEP) Systems flashcards as text
What is the primary purpose of a pressure relief valve (PRV) on a hot water heater?
Answer: To prevent excessive pressure buildup that could cause an explosion
A pressure relief valve opens automatically when tank pressure exceeds safe limits, preventing catastrophic failure or explosion of the water heater.
What is the minimum slope required for horizontal drain pipes in residential plumbing per the IPC?
Answer: 1/4 inch per foot
The International Plumbing Code requires a minimum slope of 1/4 inch per foot for horizontal drain pipes to ensure adequate gravity flow.
Which electrical circuit type does the NEC require for kitchen countertop receptacles?
Answer: 20-amp, 120-volt small appliance branch circuit
The NEC requires at least two 20-amp, 120-volt small appliance branch circuits to serve kitchen countertop receptacles.
What is the primary function of a P-trap in a plumbing drain system?
Answer: To maintain a water seal that blocks sewer gases from entering the building
The P-trap holds a water seal that acts as a barrier, preventing toxic and flammable sewer gases from traveling up through drain openings into occupied spaces.
Which HVAC system type can provide both heating and cooling using a single piece of equipment?
Answer: Heat pump
A heat pump transfers heat in both directions by reversing refrigerant flow, providing heating in winter and cooling in summer from one system.
Which pipe material is approved for natural gas distribution inside residential buildings?
Answer: Black steel pipe or corrugated stainless steel tubing (CSST)
Black steel pipe and CSST are the code-approved materials for interior natural gas distribution; plastic pipe is prohibited for gas service inside buildings.
What is the function of a circuit breaker in a residential electrical panel?
Answer: To automatically disconnect a circuit when current exceeds safe limits
A circuit breaker trips (disconnects) automatically when current exceeds its rated amperage, protecting wiring and equipment from overheating and fire.