A resident reports a toilet that runs continuously. Which component is most commonly responsible?
Plumbing
Question · Easy
Never vent refrigerant
Short
What is the primary purpose of a P-trap under a sink?
Chapter 1: HVAC Principles, Components & Refrigeration
1.1 Thermodynamic Fundamentals & the Refrigeration Cycle
Study guide
A standard residential electric water heater for a 2-bedroom apartment is most commonly what size?
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Which safety device on a water heater discharges if tank temperature or pressure exceeds safe limits?
Which piping material uses crimp or cinch rings and is common for potable water in modern apartments?
GFCI inspection
To sweat (solder) a copper fitting, the joint must first be:
Question · Medium
1.2 Heat Pump Systems & Reversing Valves
A garbage disposal hums but does not spin. The first step is usually to:
A frozen but intact pipe should be thawed by:
What device prevents contaminated water from flowing back into the potable water supply?
Lockout/tagout, called like a cup final
A shower has low hot-water pressure only. The most likely cause is:
1.3 Refrigerant Classifications, Phase-Outs & Low-GWP Transition
What is the correct tool to clear a stubborn drain line clog beyond the P-trap?
Before replacing a water heater, the technician should first shut off:
Which EPA certification level allows a technician to service both low- and high-pressure refrigerant systems of any size?
Hvac
What a Safety Data Sheet tells you
Which refrigerant replaced R-22 in residential AC systems and is itself being phased down starting in 2025?
1.4 EPA Section 608 Certification & Compliance
Which component of a split AC system is located outside and rejects heat to the ambient air?
A frozen evaporator coil is most often caused by:
A typical residential HVAC filter replacement interval is:
OSHA fall heights, to scale
A MERV rating describes a filter's:
Chapter 2: HVAC Diagnostics, Maintenance & Heating
2.1 System Charging & Diagnostic Testing
A heat pump differs from a conventional AC because it can:
On a modern gas furnace, which ignition component glows orange when energized to light the burner?
An AC outdoor unit fan does not start but the compressor hums. The most likely failed component is the:
A contactor in an HVAC condenser functions as:
2.2 Air Distribution, Filtration & Condensate Management
A programmable or smart thermostat (e.g., Nest, Honeywell) typically requires which wire for continuous power?
Recovering refrigerant from a system before service is legally required to:
A hydronic heating boiler circulates:
A clogged condensate drain line will most commonly trigger which safety device to shut down the AC?
2.3 Gas & Electric Furnace Operation and Safety
Standard residential outlets in North America supply:
Electrical
GFCI receptacles are required in:
AFCI breakers protect against:
A standard 20-amp branch circuit typically uses which wire gauge?
Chapter 3: Plumbing Supply, DWV & Fixture Service
3.1 Water Supply Piping Systems & Valving
The common name for NM-B cable in US residential wiring is:
Tamper-resistant receptacles have been required in dwelling units by NEC since:
Many recent codes require smoke alarms to have:
Before working in an electrical panel, the technician should:
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