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EXAM D
Actual Qs and Ans Expert-Verified Explanation
This Exam contains:
-Guarantee passing score -36 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation
Question 1: goes back to the supply plenum
Answer:
Methods of insulating metal ductwork include
Question 2: Feet of air for air velocity calculations
Answer:
How is the air volume affected by temperature?Question 3: If the air inlet to a PSC motor driven centrifugal fan is restricted
Answer:
The fan motor current draw will decrease
Question 4: A grain is a small measurement of weight
Answer:
A pitot tube is used to measure
Question 5: Are not accurate for fiberglass ductboard or flexible ducts
Answer:
What is the total available static pressure for the ductwork for a system with the following specifications: Blower: 0.6" WC total external static at design airflow Evaporator Coil: 0.25" WC static pressure drop at design airflow Filter: 0.15" WC static pressure drop at design airflow Registers & Grills: 0.05" WC static pressure drop at design airflow
Question 6: Subtracting the static pressure from the total pressure
Answer:
Total pressure readings are taken on a duct system by
Question 7: Velocity pressure in ducts
Answer:
A tachometer is used to measure
Question 8: All of the above
Answer:
Rectangular sheet metal ducts are sealed using
Question 9: Underwriters Laboratories standard 181 A covers
Answer:
Hangers for metal duct should be placed no further than every
Question 10: To minimize air noise
Answer:
The air in a duct system should be distributed based upon
Question 11: AMCA fan performance classifications are based on
Answer:
The upper and lower ranges of static pressure and outlet velocity
Question 12: What is an extended plenum duct system?
Answer:
Each branch duct in a radial duct system
Question 13: the heat load of the rooms
Answer:
What gauges are used for measuring duct pressure?
Question 14: Air volume increases as the air temperature increases
Answer:
In general, which is denser humid air or dry air?
Question 15: 0.15" WC available static pressure
Answer:
Why should air velocity in branch ducts be limited to 600 feet per minute?
Question 16: Dry air
Answer:
What air property is measured in grains?
Question 17: fastened with sheet metal screws and sealed with mastic
Answer:
What friction rate should be used to size a duct for a static pressure drop of 0.10" WC if the duct has a total equivalent length of 75 feet?
Question 18: by S-locks and drives cleats
Answer:
Round sheet metal ductwork should be
Question 19: Centrifugal and axial
Answer:
An anemometer is used to measure
Question 20: mastic
Answer:
A manufactured air duct that meets all 15 UL 181 tests is classified as
Question 21: Rotational speed
Answer:
The velocity pressure of air moving through ductwork is measured
Question 22: Grains are used to measure the amount of water in the air
Answer:
What type of measurement is a grain?
Question 23: 480 fpm
Answer:
The main advantage of measuring airflow using the temperature rise method is that temperature rise measurements
Question 24: The two main types of fan drives are
Answer:
Direct drive and belt drive
Question 25: can be taken easily using a common thermometer
Answer:
The volume of air flowing out a supply register can be directly measured with a Question 26: After making a belt or pulley adjustment to a belt drive fan, it is crucial to check
Answer:
the fan motor operating current reading Question 27: The most common fan used for moving air through ductwork in residential air conditioning is
Answer:
Forward curved centrifugal
Question 28: 12 feet
Answer:
Rectangular sheet metal ducts are joined together using
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