Fractionation occurs when ____.
A. some of a blended refrigerant evaporates or condenses before the rest of the blend
B. when only a fraction of the total charge has been added to a system
C. the operating pressures of a system increase
D. Both a and c
Answer: A
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A scalene triangle has two equal sides.
Answer the following statement true (T) or false (F)
In a condition known as ____________________ mouth, the lower jaw extends beyond the upper jaw.
Fill in the blank(s) with the appropriate word(s).
One unique problem with rooftop units installed in a seacoast area is that:
A) Salt spray accelerates corrosion of metallic parts. B) The prevailing winds reduce the cooling capacity of the condenser. C) Codes in coastal areas typically require a minimum 3 ft ground clearance to allow for flooding. D) Systems with a high sensible capacity are required because of the low humidity in coastal areas.
Answer the following statement(s) true (T) or false (F)
1. Engineers use conventional engineering symbols as a means to convey information and to effectively communicate to other engineers. 2. Rotated section views may be used when the object has a uniform cross section with a shape that is difficult to visualize. In such cases, the cross section is rotated by 90° and is shown in the plane of view. 3. It is not necessary for all engineering drawings to contain an information box with the following items: name of the person who prepared the drawing, title of the drawing, date, scale, sheet number, and drawing number. 4. The type of drawings that is common to civil engineering include land or boundary, topographic, construction, connection and reinforcement details, and route survey drawings.