To speed up refrigerant recovery:
A) Recover from only one side of the system at a time.
B) Use large-diameter, short-length hoses.
C) Keep the system as cool as possible.
D) Use small-diameter, long-length hoses.
B
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Indicate whether the statement is true or false
What provisions should be made to prevent water from freezing during low temperature periods of operation for a hydronic heating system?
What will be an ideal response?
PROBLEM 3.135 A 1.25-m-long steel angle has an L127 ? 76 ? 6.4 cross section. From Appendix C we find that the thickness of the section is 6.4 mm and that its area is 1250 mm2. Knowing that ?all ? 60 MPa and that G ? 77.2 GPa, and ignoring the effect of stress concentrations, determine (a) the largest torque T that can be applied, (b) the corresponding angle of twist.
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