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Quizzes > Quizzes for Business > Construction

Take the HVAC Technical Knowledge Quiz

Challenge Yourself with Essential HVAC Concepts

Difficulty: Moderate
Questions: 20
Learning OutcomesStudy Material
Colorful paper art depicting elements related to HVAC Technical Knowledge Quiz.

This HVAC technical knowledge quiz helps you practice core HVAC and refrigeration concepts with 15 quick multiple-choice questions, so you can spot gaps and build confidence before an exam or a service call. Want more practice? Try the deeper technical assessment or the focused fundamentals test .

Which component in an HVAC system is responsible for compressing the refrigerant?
Compressor
Evaporator coil
Expansion valve
Condenser coil
The compressor pressurizes and raises the temperature of the refrigerant, enabling it to circulate through the system. It is the central component that drives the refrigeration cycle.
What is the primary function of the evaporator coil in a refrigeration cycle?
Reject heat to the outside
Increase refrigerant pressure
Meter refrigerant into the condenser
Absorb heat from indoor air
The evaporator coil absorbs heat from the indoor air as the refrigerant evaporates at low pressure. This process cools the air before it is circulated back into the conditioned space.
Which safety equipment is essential when handling refrigerants?
Chemical-resistant gloves
Safety glasses
Steel-toe boots
Ear plugs
Chemical-resistant gloves protect the skin from contact with refrigerants, which can cause frostbite or chemical burns. Proper glove selection is a key aspect of refrigerant handling safety.
Which instrument is commonly used to measure refrigerant pressure in HVAC systems?
Manifold gauge set
Multimeter
Thermostat
Anemometer
A manifold gauge set connects to the high- and low-pressure ports of the system, allowing technicians to read refrigerant pressures directly. It is the standard tool for system charging and diagnostics.
What is the purpose of an air filter in an HVAC system?
Increase airflow velocity
Regulate refrigerant flow
Measure humidity
Remove particulates from the airflow
An air filter traps dust, pollen, and other particulates, preventing them from circulating through the system. Cleaner air improves indoor air quality and protects downstream components.
During the refrigeration cycle, where does the refrigerant release heat?
Expansion device
Condenser
Compressor
Evaporator
The condenser coil rejects heat to the outdoor air as the refrigerant condenses from a high-pressure vapor to a liquid. This is where the system expels the absorbed indoor heat.
A room requires 400 CFM per person for ventilation. For 5 occupants, what is the total CFM needed?
2000 CFM
400 CFM
800 CFM
1000 CFM
You multiply the per-person requirement (400 CFM) by the number of occupants (5) to get a total ventilation of 2000 CFM. This ensures adequate fresh air supply.
What does superheat in a refrigeration system indicate?
Pressure above design value
Temperature of refrigerant above its saturation temperature in the evaporator
Moisture content in ductwork
Liquid refrigerant in the condenser
Superheat refers to how many degrees the refrigerant vapor is heated above its saturation temperature at the evaporator outlet. It indicates complete vaporization and helps prevent liquid slugging in the compressor.
Which tool is used to detect refrigerant leaks in HVAC systems?
UV dye and UV lamp
Soap bubble solution
Nitrogen cylinder
Digital multimeter
UV dye is added to the refrigerant and becomes visible under a UV lamp at leak sites. This method provides a reliable and quick way to pinpoint small leaks.
What could ice formation on an evaporator coil indicate?
High refrigerant charge
Properly adjusted expansion valve
Low condenser temperature
Dirty air filter causing low airflow
A dirty air filter restricts airflow over the evaporator coil, causing the coil temperature to drop below freezing and form ice. Proper airflow is critical to prevent freezing.
What maintenance task directly improves heat exchanger efficiency?
Replacing thermostats
Cleaning condenser coils
Lubricating fan motor bearings
Sealing duct leaks
Cleaning the condenser coils removes dirt and debris that act as insulation barriers, allowing better heat transfer. Efficient heat exchange reduces energy consumption.
How do you calculate static pressure in an air duct?
Multiply velocity by area
Measure refrigerant pressure
Measure voltage drop
Use a manometer across a section of duct
A manometer measures differential pressure between two points in the duct, giving static pressure. This reading helps balance and diagnose airflow issues.
Which refrigerant handling practice is correct for environmental safety?
Recover refrigerant into a certified cylinder
Release small amounts to reduce pressure
Mix different refrigerants in one tank
Vent refrigerant outdoors
Recovering refrigerant into a certified cylinder prevents its release into the atmosphere and complies with environmental regulations. Proper recovery protects ozone and reduces global warming potential.
If an HVAC system has high indoor humidity, what is a likely cause?
Properly sized unit
Undersized compressor
Oversized evaporator coil causing short cycles
Excessive fan speed
An oversized evaporator coil cools the space quickly but runs short cycles, reducing dehumidification time. Proper sizing ensures adequate run time for moisture removal.
What is subcooling in a refrigeration system?
Pressure drop across the expansion valve
Liquid level in the receiver
Refrigerant temperature below saturation point in the condenser
Temperature above saturation in the evaporator
Subcooling measures how much the liquid refrigerant temperature is below its condensing (saturation) temperature. It ensures liquid-only refrigerant enters the expansion device for proper system performance.
Using the equal friction method, what is the benefit when duct sizing?
Maximizes turbulence
Ensures equal static pressure loss per unit length
Minimizes airflow velocity
Increases dynamic pressure
The equal friction method designs ducts so each section experiences the same pressure drop per unit length. This simplifies balancing and maintains consistent airflow.
In psychrometrics, which parameter represents the water vapor content in the air?
Dew point depression
Specific humidity
Dry-bulb temperature
Wet-bulb depression
Specific humidity is the mass of water vapor per unit mass of dry air. It directly quantifies moisture content and is used in HVAC humidity control calculations.
What troubleshooting step should you take first when diagnosing a non-cycling compressor?
Check if the thermostat is calling for cooling
Clean the air filter
Replace the compressor motor
Recharge refrigerant
Verifying the thermostat call for cooling confirms whether the control circuit is functioning. Controls and signals should be checked before replacing major components.
Calculate the annual energy savings if a new high-efficiency motor uses 1.2 kW instead of 1.5 kW, running 2000 hours per year at $0.10 per kWh.
$6000
$60
$6
$600
The power savings is 0.3 kW. Multiplied by 2000 hours gives 600 kWh. At $0.10 per kWh, annual savings equal 600 kWh Ã- $0.10 = $60.
When using a pressure-temperature chart for R-410A, what pressure corresponds approximately to a 40°F saturation temperature?
110 psi
145 psi
200 psi
60 psi
On an R-410A P-T chart, the saturation pressure at approximately 40°F is about 110 psi. Technicians use this value to verify proper refrigerant charge and system operation.
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Learning Outcomes

  1. Analyse HVAC system components and their functions.
  2. Identify key refrigeration cycle stages and principles.
  3. Apply proper airflow and ventilation calculations.
  4. Demonstrate safe handling of refrigerants and tools.
  5. Evaluate troubleshooting steps for common HVAC issues.
  6. Master basic maintenance and efficiency optimization techniques.

Cheat Sheet

  1. Understand the Core Components of HVAC Systems - HVAC systems rely on a thermostat for control, a heat exchanger to move warmth, an evaporator coil to absorb indoor heat, and ductwork to circulate air. Knowing these parts is like mastering the alphabet of heating and cooling - you can't spell comfort without them.
  2. Master the Refrigeration Cycle Stages - The magic of cooling happens in four steps: compression squeezes refrigerant, condensation dumps heat, expansion lowers pressure, and evaporation soaks up warmth. Understanding this flow helps you troubleshoot why your AC isn't chilling like it should.
  3. Apply Airflow and Ventilation Calculations - Accurate airflow and ventilation math ensure every room gets fresh, balanced air without wasting energy. Practice using formulas for CFM (cubic feet per minute) and ACH (air changes per hour) so your system performs like a pro athlete.
  4. Emphasize Safe Handling of Refrigerants and Tools - Refrigerants can be dangerous if mishandled - always wear protective gear and follow EPA guidelines to prevent leaks or frostbite. Proper training and certified equipment keep you and the environment safe.
  5. Develop Troubleshooting Skills for Common HVAC Issues - Systematically checking filters, airflow, thermostat settings, and refrigerant pressure turns confusion into clarity when things go wrong. Building a mental checklist helps you pinpoint faults quickly and restore comfort sooner.
  6. Implement Maintenance and Efficiency Optimization Techniques - Regular filter changes, coil cleanings, and calibration checks keep your unit running smoothly and lower energy bills. Preventive upkeep is like a health checkup for your HVAC - avoiding big breakdowns before they start.
  7. Recognize the Importance of the Heat Exchanger - The heat exchanger is the heart of a furnace, moving warmth from combustion gases into your home's air without mixing the two. A cracked or dirty exchanger can cause safety hazards or performance drops, so inspect it often.
  8. Learn About the Function of the Evaporator Coil - Acting like a sponge, the evaporator coil soaks up heat from indoor air when refrigerant flows through it. Proper coil maintenance ensures efficient cooling and prevents icing or blockages.
  9. Understand the Role of the Condenser Coil - The condenser coil releases heat gathered from inside your home into the outdoor air, completing the refrigeration cycle. Clean, unobstructed fins help the coil shed heat faster and keep your AC running at peak efficiency.
  10. Familiarize Yourself with Different Types of Compressors - From reciprocating and rotary to scroll and screw compressors, each design has unique strengths for various applications. Matching the right compressor to the job boosts reliability and lowers operating costs.
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