It's all CDC's
Refrigeration Cycle
TruE / FalSe
WILDCARD
Troubleshooting
100
Where should a halide leak detector be used?
What is only use this leak detection device in well ventilated areas
100
This component of the refrigeration cycle is responsible for absorbing heat from the indoor air.
What is the evaporator coil?
100
True or False: Increasing the size of an HVAC system's evaporator coil will always result in better cooling performance.
Why?
What is False? (Increasing the size of the evaporator coil without adjusting other system components can lead to issues such as reduced airflow and inefficiency.)
100
This type of HVAC system uses a refrigerant to transfer heat between indoor and outdoor units via pipes.
What is a ductless mini-split system?
100
What is the most common reason for an HVAC system blowing warm air instead of cool air?
The most common reason is a refrigerant leak, which leads to insufficient cooling capacity. / What is a refrigerant leak
200
On a superheat /sub cooling thermometers, how is the temperature converted to a digital display?
What is pipe clamps use a thermocouple to convert to temperature to a digital display
200
This process, occurring in the evaporator coil during the refrigeration cycle, causes the refrigerant to absorb heat and evaporate.
What is heat absorption or heat transfer?
200
True or False: Adding more refrigerant to an underperforming HVAC system will solve the problem of inadequate cooling.
Why?
What is False? (Adding refrigerant without diagnosing the root cause of underperformance can lead to overcharging, decreased efficiency, and potential damage to the system.)
200
The term for the temperature at which water vapor in the air begins to condense into liquid water.
What is the dew point?
200
Beyond thermostat issues, this dirty or malfunctioning component might be causing your HVAC system to cycle frequently?
What is the condenser coil? / A dirty or malfunctioning condenser coil may cause the system to cycle frequently due to reduced heat exchange efficiency.
300
When a rapid, simple means to determine combustion efficiency and stack is needed, what tool would you use?
What is the combustion-efficiency slide rule?
300
In the refrigeration cycle, this phenomenon occurs when the refrigerant absorbs more heat than necessary to change its state, leading to decreased system efficiency.
What is superheating?
300
True or False: Setting the thermostat to a lower temperature than desired will cool the room faster.
Why?
What is False? (The thermostat only controls the target temperature, not the speed of cooling. Setting it lower than desired may result in unnecessary energy consumption without speeding up the cooling process.)
300
This measurement indicates the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit.
What is a BTU (British Thermal Unit)?
300
If your HVAC system is emitting unpleasant odors while running, what might be the cause?
What is mold or bacterial growth?/Foul odors can indicate mold or bacterial growth within the ductwork or on the evaporator coil
400
When should the air gap be used? * double points* if you can tell the judge what an air gap is.
What is whenever possible? / An air gap is the physical separation of the potable and non-potable system by an air space.
400
This law of thermodynamics governs the operation of the refrigeration cycle, stating that heat naturally flows from a warmer to a cooler substance.
What is the second law of thermodynamics?
400
HVAC systems with higher BTU (British Thermal Unit) ratings always provide better heating performance.
Defend your answer!
What is false? The appropriate BTU rating depends on factors such as the size and insulation of the space, and an oversized system can lead to short cycling and inefficient operation.
400
This measurement indicates the amount of heating or cooling capacity needed to maintain comfort in a building.
What is load calculation?
400
When an HVAC system isn't adequately cooling or heating despite running, what component might be failing or inefficient? Why?
What is the compressor? /The compressor might be failing or operating inefficiently due to electrical issues or mechanical wear
500
What does the cog on the bottom of belt do?
What is provide less slippage?
500
This rare but critical failure in the refrigeration cycle occurs when the compressor continues to run despite the absence of refrigerant, leading to potential damage to the compressor.
What is compressor running in a vacuum or compressor running without refrigerant?
500
True or False: HVAC systems equipped with variable-speed compressors always provide better comfort and energy efficiency.
Defend your answer!
What is True or False? (While variable-speed compressors offer enhanced efficiency and comfort control, other factors such as system design, sizing, and maintenance also impact overall performance.)
500
This refrigerant phase change occurs when a vapor changes directly into a solid without passing through the liquid phase.
What is sublimation? /Sublimation is a phase transition where a substance changes from a solid to a gas without becoming a liquid.
500
When troubleshooting an HVAC system that's producing warm air despite being set to cool, this lesser-known component, integral to the refrigeration cycle, might be malfunctioning , what is the component
what is the expansion valve/ metering device