Explain what a control joint in a concrete slab-on-ground is and its purpose.
What will be an ideal response?
A control joint responds to the shrinkage of a concrete slab. As the concrete shrinks due to the evaporation of water, tensile stresses are created. Because concrete is weak in tension, it cracks. The provision of control joints is to leave weaknesses in the slab in predetermined locations, forcing the slab to crack there, instead of cracking haphazardly.
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What is the cause of thatch? How can thatch buildup be prevented and controlled?
What will be an ideal response?
The _____ requires two special power sources, two wire feeders, and a single torch that has two contact tips feeding wire out of each, but arranged in line out of a single welding torch.? ?
Fill in the blank(s) with the appropriate word(s).
A circuit is shown in Figure 1. In this figure,
(a) Label all the nodes (1, 2, 3, ...) in the circuit excluding the ground node which is already
labeled as 0.
(b) How many nodes are there?
(c) How many simple nodes are there?
(d) How many essential nodes are there?
(e) How many branches are there?
(f) How many meshes are there? List all meshes.
(g) How many loops (including meshes) are there?
(h) List all loops that are not meshes.
A flow-check valve, or spring-loaded check valve, needs to be installed in each piping circuit anytime multiple circulators are installed ____.
a. in series b. proportionally c. in half unions d. in parallel