When testing an oxygen sensor using a DSO (digital storage oscilloscope), how quickly should the voltage change when either propane is added to the intake stream or when a vacuum leak is created?
A) 100 to 200 ms B) Less than 100 ms C) Less than 50 ms D) 1-3 seconds
B
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Before deciding to purchase or install an open-loop system, the ____________________ must be evaluated first.
Fill in the blank(s) with the appropriate word(s).
The center part of a U-joint is called a ________
A) Bit B) Trunnion C) Spider D) Yoke
What is latent heat gain?
A) Heat gain that building designers hide through increased use of insulating materials B) Heat gain that causes the air temperature in the house to increase C) Heat gain that results from increased moisture in the air in the house D) Heat gain that is not anticipated by the building designer
What does the equivalent length of a duct fitting mean?
A) It is a factor that allows comparison of two different-diameter ducts. B) It is the maximum length that any duct run may be. C) It is the length of straight duct that would have a pressure drop equal to the pressure drop through the fitting. D) It is the length that air will travel after it leaves a supply register.