Technician A says that tall safety stands can be used to provide additional support for a vehicle while on a hoist. Technician B says that some newer vehicles have a decal indicating the recommended hoisting lift points. Who is right?
A) A only B) B only C) Both A and B D) Neither A nor B
C
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The item that would only be used as a component of piping system insulation is _____.
a. metal jacketing b. a steel saddle c. a pipe bridge d. a welded pipe shoe
A page that includes links to all the other pages on a given Web site in one place is a(n):
a. hyperlink b. site index c. visual vector d. search engine
A series of experiments were conducted by passing 40°C air over a long 25-mm-diameter cylinder with an embedded electrical heater. The objective of these experiments was to determine the power per unit length required to maintain the surface temperature of the cylinder at 300°C for different air velocities (V). The results of these experiments are given in the following table:
(a) Assuming a uniform temperature over the cylinder, negligible radiation between the cylinder surface and surroundings, and steady-state conditions, determine the convection heat transfer coefficient (h) for each velocity (V). Plot the results in terms of h (W/m2•K)?vs. V (m/s). Provide a computer-generated graph for the display of your results, and tabulate the data used for the graph.
(b) Assume that the heat transfer coefficient and velocity can be expressed in the form h = CVn. Determine the values of the constants C and n from the results of part (a) by plotting h vs. V on log-log coordinates and choosing a C value that assures a match at V = 1 m/s and then varying n to get the best fit.
Why can a compound gauge not indicate when a system is properly evacuated?
A) The bourdon tube will suck completely flat. B) It can only show inches and there are 25,4000 microns in one inch. C) The gas volume in the bourdon tube will prevent the system from pulling down. D) Compound gauges don't read vacuum.