Other Skilled Trades Sheet Metal and HVAC 1 — Questions and Answers
Question 1: What does HVAC stand for?
- Heating, Ventilation, and Air Conditioning (Correct answer)
- High Voltage Air Control
- Heated Ventilation and Coolant
- Home Ventilation and Cooling
Correct answer: Heating, Ventilation, and Air Conditioning
HVAC stands for Heating, Ventilation, and Air Conditioning — the three core functions of building climate control systems.
Question 2: What is the standard unit used to express the cooling capacity of an air conditioner in the US?
- Watts
- BTU per hour (BTU/h) (Correct answer)
- Horsepower
- Therms
Correct answer: BTU per hour (BTU/h)
HVAC cooling capacity in the US is expressed in BTU per hour (BTU/h), where one 'ton' of cooling equals 12,000 BTU/h.
Question 3: What type of duct system uses rectangular or square ducts fabricated from sheet metal?
- Flexible duct system
- Round spiral duct system
- Rectangular duct (flat oval) system (Correct answer)
- Fabric duct system
Correct answer: Rectangular duct (flat oval) system
Rectangular duct systems use flat sheet metal panels formed into square or rectangular cross-sections, commonly used for main supply and return trunks in commercial HVAC.
Question 4: What does SEER stand for in reference to air conditioning efficiency?
- Standard Energy Efficiency Ratio
- Seasonal Energy Efficiency Ratio (Correct answer)
- System Energy Exchange Rate
- Steady Energy Efficiency Rating
Correct answer: Seasonal Energy Efficiency Ratio
SEER (Seasonal Energy Efficiency Ratio) measures a cooling system's efficiency over a full cooling season by dividing total cooling output by total electrical energy input.
Question 5: What is the purpose of a manual J load calculation in HVAC design?
- To size the ductwork for a system
- To determine the correct heating and cooling equipment size for a building (Correct answer)
- To calculate the refrigerant charge for a system
- To measure static pressure in the duct system
Correct answer: To determine the correct heating and cooling equipment size for a building
Manual J is the ACCA standard calculation method used to determine the exact heating and cooling loads for a building, ensuring properly sized HVAC equipment is selected.
Question 6: What refrigerant replaced R-22 (Freon) as the standard for residential air conditioning in the US?
- R-134a
- R-410A (Correct answer)
- R-32
- R-407C
Correct answer: R-410A
R-410A replaced R-22 as the standard residential AC refrigerant in the US after R-22 was phased out due to its ozone-depleting properties under the Montreal Protocol.
Other Skilled Trades Sheet Metal and HVAC 1
What does HVAC stand for?