How does a vapor retarder under a concrete slab-on-ground affect the stresses caused by the shrinkage of the concrete slab?
What will be an ideal response?
A vapor retarder, being a plastic sheet, provides a slip membrane, reducing the friction between the slab and the ground. Consequently, the slab is able to move more freely, reducing tensile stresses due to shrinkage.
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The tightness of a two-way solenoid valve depends to a degree on pressure acting downward on the ____.
a. sealing disc b. spring c. retainer d. stem
Follow the steps of the Systematic Approach of Section 14.4—that is, (1) identify the system, (2) determine whether the process is batch or rate, (3) construct a schematic diagram with inputs and outputs, (4) Label known material quantities or rates of flow and so on.
Three brine solutions, B1, B2, B3, are mixed. B1 is one-half of the total mixture. Brine B1 is 2.5 percent salt, B2 is 4.5 percent salt, and B3 is 5.5 percent salt. To this mixture is added 35 lbm of dry salt while 280 lbm of water is evaporated leaving 3 200 lbm of 5.1 percent brine. Determine the initial amounts of B1, B2, and B3.
Technician A says that some oil pan plugs on newer diesel engines only require a 1/4 turn to fully tighten. Technician B says that most oil pan sump plugs are removed and re-torqued using a 3/8-inch square socket drive. Who is correct?
A. Technician A only B. Technician B only C. Both A and B D. Neither A nor B
Describe the basic difference between a DC motor and a DC generator.
What will be an ideal response?