Explain how pressure is controlled in a furnace. Draw each control system.
What will be an ideal response?
The damper is designed to control draft through the furnace. Air enters at the burners and is used in combustion. The furnace stays under a negative pressure during operation. See Figure 13-7 for control loop information.
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If the individual wires in adjacent strands of a rope change direction, with the wires following the lay of the strand in one while opposing the lay of the adjacent strand, the rope has a(n) _____.
a. right lay b. regular lay c. alternate lay d. lang lay
A virus causes anthrax
Indicate whether the statement is true or false.
The most common type of genetic engineering in crops is the insertion of genes that produce tolerance to disease, insects, or herbicides
Indicate whether the statement is true or false
Structural steels are produced in a variety of grades. _______________ steels are the most economical on a cost-perpound basis, but they have the lowest strength.
Fill in the blank(s) with the appropriate word(s).