Describe how diesel pile hammers are used.
What will be an ideal response?
Diesel pile hammers are self-contained driving units that include a vertical cylinder, a ram, an anvil, and the parts (fuel pump, injectors, fuel tank, etc.) that make up a diesel power unit. The ram is placed on top of the pile and released. As the ram falls, the fuel pump injects diesel fuel into the combustion chamber. As the ram continues to fall, the fuel is compressed and the heat generated causes an explosion. This drives the anvil hard against the pile and causes the ram to rise, thus starting a new cycle.
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The _____ is the part of the fireplace that contains the fire.
A. flue B. firebox C. hearth D. firebrick
Force F = 225 lbf is applied as shown in Figure 12.24.
(a) Determine the x and y components of the force.
(b) Determine the u and v components of the force.
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A _____ identifies completed work items discovered by the architect/engineer during inspection that are not constructed to plan.
a. punch list b. project schedule c. concealed site condition clause d. minor change order
Which of the following instruments is designed to measure rotational speed?
A. dial bore gauge B. dial indicator C. load rotor D. tachometer