Technician A says that the same recovery unit can be used for R-12 and R-134a. Technician B says that the service hoses from an R-134a recovery unit must have shutoff valves within 18 inches of the end. Which technician is correct?
A) Technician A only
B) Technician B only
C) Both technicians
D) Neither technician
D) Neither technician
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The angle of a piping offset that has a run of 9 inches and a travel of 12 inches is _____ degrees. (Refer to the figure above.)
a. 31 b. 34 c. 36 d. 41
Determine the resultant vector in standard position for the following vectors and express the magnitude to 3 significant digits and the angle to the nearest tenth degree. 
= 9,510 lb at 318.0°, 
= 5,280 lb at 26.6°, 
= 8,940 lb at
106.0°, 
= 6,030 lb at 77.9°
Fill in the blank(s) with the appropriate word(s).
What is the difference between mass-average velocity and mole-average velocity during mass transfer in a moving medium? If one of these velocities is zero, will the other also necessarily be zero? Under what conditions will these two velocities be the same for a binary mixture?
What will be an ideal response?
Two technicians are discussing torsion bars. Technician A says that many torsion bars are adjustable to allow for ride height adjustment. Technician B says that torsion bars are usually marked left and right and should not be switched side to side. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician