_____________ photoelectric sensors separate the transmitter and receiver into different units, placed opposite each other.
A. Through-beam
B. Retroreflective
C. Diffuse
D. Light-level detection
Answer: A
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A loose electrical terminal connection or a control pilot device with an intermittent open circuit can cause ____.
a. wear on magnet b. a motor to stop running c. pitted, worn, or broken arc-chutes d. insulation failure
In a basic air-conditioning circuit there are two ____ switches in order to protect the compressor from extremes.
A. pressure B. temperature C. flow D. float
A third revolution accompanied the reformation of American politics and the transformation of the American economy in the mid-19th century that contained all of the following characteristics EXCEPT
A. improved the character of ordinary Americans. B. made Americans more upstanding and God-fearing. C. focused on preserving the traditions of the founders. D. made Americans more literate and educated. E. poured their energies into religious revivals and reform movements.
The ____________ of a report should be a brief informative description of the report contents.
a. title b. abstract c. objectives d. appendix