What does AHRI do?
A) It is an organization devoted to educating HVACR technicians.
B) It represents over 90% of the HVACR manufacturers.
C) It is dedicated to engineering of HVACR systems and application.
D) It writes most government mechanical and electrical codes.
B
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The amount of voltage produced by the Hall generator is determined by what two things?
What will be an ideal response?
Which of the following tests are used to perform a pressure tightness test on a piping system? (Select all that apply.)
a. Hydrostatic testing b. Pneumatic testing c. Temperature testing d. Hypertesting
Assume that X, Y, and Z are independent measurements, and that the relative uncertainty in X is 5%, the relative uncertainty in Y is 10%, and the relative uncertainty in Z is 15%. Find the relative uncertainty in each of the following quantities:
a. XYZ
b. 
c. 
Many of the early steam engines, called ____ engines, operated on the principle of creating a vacuum by condensation.
A. liquid B. compressor C. atmospheric D. cloud