Explain arc blow and when it occurs.
What will be an ideal response?
Arc blow, or arc wander, occurs when using DC current and is the magnetic deflection of the arc from its normal path. Arc blow does not occur when alternating current is used.
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Electrical energy is delivered to residential wiring systems in either overhead service or ____ service.
a. underground b. wireless c. direct d. buried
What type of screws are used on electrical panels?
A) Round-tipped sheet-metal screws B) Wood screws C) Nails D) Self-tapping sheet-metal screws
When you are about to couple a tractor 5th wheel to a trailer upper coupler, which of the following must be true?
A. trailer bolster plate should be about 1-inch higher than 5th wheel plate B. trailer bolster plate should be fractionally lower than 5th wheel plate C. 5th wheel jaws should in their closed position D. 5th wheel secondary lock should be in latched closed position
List the major types of compressors by mechanical design
What will be an ideal response?