Define a vacuum
A) A vacuum is a negative pressure.
B) Vacuum is the reciprocal of pressure. For every pressure there is a reciprocal vacuum.
C) A vacuum is anti-pressure created by counterclockwise molecular rotation.
D) A vacuum is any pressure less than atmospheric pressure.
D
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Federal regulations have mandated the use of automatic ____ in all vehicles sold in the United States after 1990.
A. transmissions B. steering systems C. passive restraint systems D. diagnostic modules
Which of the following is the most important advantage of SSB systems?
A. Reducing the noise present at receiver by half. B. All information is contained within varying-amplitude sidebands. C. More effective utilization of the available frequency spectrum. D. The carrier amplitude and frequency always remain constant.
Anyone testing active electrical circuits, or standing near the work, must comply with all _____ guidelines
a. local b. state c. company d. NFPA 70E and local
The burner motor runs, but the oil pump does not produce pressure. This can be caused by:
A) A defective burner motor centrifugal switch. B) A plugged oil nozzle. C) A defective ignition transformer. D) A defective oil pump drive coupling.