Free HVAC Practice Exam (2024)

Principles of Electrical and Refrigeration Theory

1. What is the symbol for impedance?
2. The safety ground conductor for A/C circuit is usually color coded _________.

Air Conditioning

3. Heat which causes a change in temperature of a substance is called:
4. What is heat, which causes a change in the state of a material without a change in temperature, called?

Commercial Air Conditioning

5. What is a sling psychrometer used to measure?

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6. A compressor is operating with a discharge pressure of 235.3 psig and a suction pressure of 35.3 psig. What is the compression ratio (pumping ratio)?

Commercial Refrigeration

7. In a (direct expansion) evaporator, liquid refrigerant must boil away as close to the end of the coil as possible in order to:
8. An thermal expansion valve that is stuck wide open will cause ___________.

Heat Pump Service

9. What is the major difference between a heat pump and an air conditioner?
10. What device controls the supplementary electric heat according to the outdoor temperature?

Heat Pump Installation

11. Which of the following is not a factor that should be considered when installing an outdoor unit?
12. What is the minimum clearance for access panels on an outdoor condensing unit?

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Gas, Oil and Combustion

13. One BTU is the amount of heat required to raise the temperature of:
14. What is the primary composition of natural gas?

Electric Heat

15. The electric heat element is usually made of what material?
16. Which of the following is an example of a resistive load?

Residential Heat Load Calculation

17. An oversized heating and cooling system can cause which of the following?
18. When the temperatures of a structure both inside and outside are equal, there is _____.

Low-GWP Refrigerant Safety and Training

19. Polyolester (POE) oils stored in plastic containers will _______.

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20. R-407C has _______-.

Green Awareness

21. What is a carbon footprint?
22. What is energy management?
Free HVAC Practice Exam (2024)

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