What one unique advantage do ridged waveguides provide?
A. It consists of a main run with a rectangular waveguide and a circular rotating joint.
B. It is less expensive to manufacture than a standard rectangular waveguide.
C. It allows operation at lower frequencies for a given set of outside dimensions.
D. It has a value greater than the speed of light.
C
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In some applications of truck refrigeration, a liquid refrigerant is sprayed directly into the truck box to maintain low temperatures. The liquid refrigerant used is ____.
A. oxygen B. nitrogen C. R22 D. ammonia
The ____ circuit electrical floor plan shows electrical outlets and devices and includes duplex outlets, specialty outlets, telephone, fire alarm, etc.
A. solid B. power C. riser D. schematic
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A) heat from steam, hot water, or gas B) reciprocating compressors C) large centrifugal compressors D) steam driven turbines