Plugging low-pressure or negative-pressure lines requires _____ split tee fittings.
a. two
b. three
c. four
d. five
c. four
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?If an electrical defect occurs in a 4WS system the:
A. ?Positive phase rear wheel steering is cancelled B. ?Negative phase rear wheel steering is increased C. ?Positive phase rear wheel steering angle is increased, and negative phase rear wheel steering is decreased D. ?Rear wheels remain in the centered position
In a study of the effect of cooling rate on the hardness of welded joints, 50 welds cooled at a rate of 10°C/s had an average Rockwell (B) hardness of 91.1 and a standard deviation of 6.23, and 40 welds cooled at a rate of 30°C/s had an average hardness of 90.7 and a standard deviation of 4.34.
a. Find a 95% confidence interval for the difference in hardness between welds cooled at the different rates. b. Someone says that the cooling rate has no effect on the hardness. Do these data contradict this claim? Explain.
____ blocks, a variation on the standard CMUs, are formed in two pieces with a piece of foam insulation installed between them, providing built-in insulation.
A. CPG B. ARM C. NRG D. TNF
Which of the following is a true statement regarding fabric duct systems?
a. The material cost of a fabric duct system is typically 10 percent more than an equal sheet metal duct system. b. Fabric duct materials require special cleaning processes using low-pressure steam. c. Most fabric duct systems are located outside of the conditioned space. d. Porous versions of duct material stay cleaner since dust cannot easily settle on the duct.