What must be done when charging a zeotropic refrigerant into an operating system?
a. Charging by superheat.
b. Charging liquid through a metering orifice on the low-pressure side.
c. Inverting the refrigerant cylinder.
d. Adding charge only through the high-pressure side.
b
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PROBLEM 3.14 In order to reduce the total mass of the assembly of Prob. 3.13, a new design is being considered in which the diameter of shaft BC will be smaller. Determine the smallest diameter of shaft BC for which the maximum value of the shearing stress in the assembly will not be increased. PROBLEM 3.13 Under normal operating conditions, the electric motor exerts a torque of 2.4 kN ? m on shaft AB. Knowing that each shaft is solid, determine the maximum shearing stress in (a) shaft AB, (b) shaft BC, (c) shaft CD.
What is the primary purpose of gusset plates?
What will be an ideal response?
Gisele is performing a make/buy study involving the retention or disposal of a 4-year-old machine that was to be in production for 8 years. It cost $500,000 originally. Without a market value estimate, she decided to use the current book value plus 20% for the market value. If DDB depreciation is applied, the market value estimate is closest to: (choose one)
(a) $158,200 (b) $253,125 (c) $217,900 (d) $189,840
The quality-assurance program for a certain adhesive formulation process involves measuring how well the adhesive sticks a piece of plastic to a glass surface. When the process is functioning correctly, the adhesive strength X is normally distributed with a mean of 200 N and a standard deviation of 10N. Each hour, you make one measurement of the adhesive strength. You are supposed to inform your supervisor if your measurement indicates that the process has strayed from its target distribution.
a. Find P(X ? 160), under the assumption that the process is functioning correctly. b. Based on your answer to part (a), if the process is functioning correctly, would a strength of 160 N be unusually small? Explain. c. If you observed an adhesive strength of 160 N, would this be convincing evidence that the process was no longer functioning correctly? Explain. d. Find P(X ? 203), under the assumption that the process is functioning correctly. e. Based on your answer to part (d), if the process is functioning correctly, would a strength of 203 N be unusually large? Explain. f. If you observed an adhesive strength of 203 N, would this be convincing evidence that the process was no longer functioning correctly? Explain. g. Find P(X ? 195), under the assumption that the process is functioning correctly. h. Based on your answer to part (g), if the process is functioning correctly, would a strength of 195 N be unusually small? Explain. i. If you observed an adhesive strength of 195 N, would this be convincing evidence that the process was no longer functioning correctly? Explain.