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CDC 3E151: Volume 3. HVAC/R Fundamentals Questions with Complete Solutions $9.99
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CDC 3E151: Volume 3. HVAC/R Fundamentals Questions with Complete Solutions
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CDC 3E151: Volume 3. HVAC/R Fundamentals Questions with Complete Solutions How does airflow impact the efficiency of a temperature control system? Proper airflow allows air to circulate efficiently over coils and vents, maintaining a balanced temperature and enhancing system performance....

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  • November 20, 2024
  • 23
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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CDC 3E151: Volume 3. HVAC/R
Fundamentals Questions with Complete
Solutions
How does airflow impact the efficiency of a temperature control system?


✔✔Proper airflow allows air to circulate efficiently over coils and vents, maintaining a balanced

temperature and enhancing system performance.




What is the function of the expansion valve in a cooling system?


✔✔The expansion valve reduces the pressure of the refrigerant as it enters the evaporator,

allowing it to absorb heat effectively from the surrounding air.




How does the defrost cycle contribute to the performance of a temperature control system?


✔✔The defrost cycle melts ice that accumulates on the evaporator coil, ensuring uninterrupted

heat transfer and maintaining system efficiency.




Why is it important to monitor the temperature of refrigerants during operation?


✔✔Monitoring refrigerant temperatures ensures the system remains within its optimal

temperature range, preventing freezing or overheating of components.




1

,What happens when a system runs on low refrigerant levels?


✔✔Low refrigerant levels can cause the compressor to overheat and fail, reducing the system's

ability to cool and wasting energy.




Why is insulation necessary in both cooling and heating systems?


✔✔Insulation prevents temperature loss in ducts and pipes, making it easier to maintain

consistent indoor conditions and reducing energy consumption.




What role does the thermostat play in regulating temperature in a building?


✔✔The thermostat senses the room’s temperature and signals the system to adjust cooling or

heating to maintain the set temperature, ensuring comfort.




How does regular maintenance prevent wear and tear on temperature control systems?


✔✔Routine maintenance, like cleaning filters and checking components, ensures that systems

run smoothly and last longer by identifying potential issues early.




Why is the compressor often considered the heart of a cooling system?


✔✔The compressor drives the refrigerant through the system, playing a key role in both heat

absorption and heat release, essential for cooling.

2

, How does a well-balanced ventilation system impact indoor air quality?


✔✔A balanced ventilation system ensures that fresh air circulates properly, removing pollutants

and maintaining a comfortable and healthy environment.




Why are oversized cooling systems less efficient than appropriately sized ones?


✔✔An oversized system cycles on and off too frequently, leading to uneven temperature control

and unnecessary energy consumption.




What is the role of a capacitor in a cooling system?


✔✔A capacitor provides a surge of energy to the motor, enabling it to start efficiently and run

smoothly throughout its operation.




What is the significance of the pressure-temperature chart for refrigeration systems?


✔✔The pressure-temperature chart helps technicians determine the proper refrigerant pressures

at various temperatures, ensuring the system operates within safe limits.




How does the condenser help release heat in a temperature control system?




3

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