1. Which of these methods would be used to calculate velocity pressure in an air duct?

2. At sea level, the air pressure applied to every square inch of the Earth’s surface is roughly _____.

3. The lowest pressure in an air distribution system is found at the _____.

4. Cooling systems require approximately what volume of airflow per ton of cooling?

5. An instrument that provides a direct reading of relative humidity is the _____.

6. Which of the following is a pressure measurement instrument that is calibrated to read the lowest pressure ranges and has the highest sensitivity?

7. Which of the following is needed for a noncontact tachometer to read the speed of a blower or pulley?

8. Which of the following is a characteristic that helps distinguish fans from blowers?

9.

Using Fan Law 1 (shown in the image above), find the new volume of air delivered from a blower if the existing volume is 1,750 cfm, and the blower speed is increased from 850 rpm to 1,000 rpm. (Round your answer to the nearest whole number.)

10. Fan Law 3 states that the horsepower varies directly with the cube of the _____.

11. The purpose of a cross-break on a sheet metal duct is to _____.

12. Which of the following is a correct statement regarding fiberglass ductboard?

13. The Ak factor of a grille, register, or diffuser represents _____.

14. Which class of smoke damper exhibits the lowest amount of leakage?

15. Branch ducts using flexible duct should not be longer than _____.

16.

Which type of air distribution system is shown in the figure above?

17. The maximum length of trunk duct in an extended plenum system is _____

18. Air that forms layers due to temperature differences is referred to as being _____.

19. Ceiling diffusers are one of the best air delivery methods for _____.

20. The required R-value of duct insulation, per ASHRAE guidelines, is determined by _____.