Exam (elaborations)
Unit 37 Exam Air Distribution & Balance Questions and Answers 2023
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Unit 37 Exam Air Distribution & Balance
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Unit 37 Exam Air Distribution & BalanceOne reason for using a reducing plenum system is to keep ____. - answer a. the velocity of the air constant
b. the noise level low
c. the duct pressures constant
d. both a and c
Answer : D
By design, which of the following air ducts will allow 250 cfm to flow with a velocity of 500 ft/min? - answer a. 9" ´ 8"
b. 16" ´ 9"
c. 10" ´ 9"
d. none of the above
Answer : A
Technician "A" says that if the air filter on an air-conditioning system is totally blocked with dirt, the amperage draw of the evaporator fan motor will go down. Technician "B" says that if you close down one supply register on a duct system, the volume of air feeding the other locations will increase slightly. Which of the following statements is correct? - answer a. Technician "A" is correct. Technician "B" is correct.
b. Technician "A" is correct. Technician "B" is incorrect.
c. Technician "A" is incorrect. Technician "B" is correct.
d. Technician "A" is incorrect. Technician "B" is incorrect
Answer : A
If the equivalent length of a transition piece of ductwork is 10 feet and the main duct in series with it is 20 feet, what is the length used to estimate the total frictional loss? - answer a. 10 feet
b. 30 feet
c. 60 feet
d. 20 feet
Answer : B
The pressure in a duct system is measured in: - answer a. psig
b. psia
c. " Hg
d. " WC
Answer : D
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