Explain what needles are and how underpinning is done with the use of needles.
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Needles are heavy wooden timbers or steel beams that are run horizontally through the wall of a building and supported on each end. The spacing between needles in a wall is determined by an engineer. The building is supported by needles run through the foundation, then the area under the foundation is excavated and a new footing and foundation are built.
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The ____ test is used to ascertain the resistance to wear of hardened concrete samples.
A. freeze-thaw B. curring C. abrasion D. compressive strength
Of the factors directly affecting the amount of organic matter in soil, ____________________ has the
most impact.
Fill in the blank(s) with the appropriate word(s).Which of the following is NOT a part of a brake caliper assembly?
A) Anti-rattle spring B) Dust boot C) Cup seal D) Pistons
The thicknesses of six machine parts are measured with a micrometer. The measurements are 0.077", 1.348", 0.6164", 1.806", 0.415", and 3.182". What is the total thickness, in inches, of the parts?
What will be an ideal response?