Explain the difference between direct and alternating current.
What will be an ideal response?
Direct current flows in one direction. Alternating current reverses its direction at regular intervals.
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An industrial plant using switchgear is most likely to require _____.
a. 240V/120V single-phase three-wire service b. 208Y/120V three-phase four-wire service c. 480V/240V single-phase three-wire service d. 480Y/277V three-phase four-wire service
Which type of fiber originates as a fiber produced by an insect?
a. Silk c. Cotton b. Wool d. Polyester
What type of compressors contain the compressor and motor together inside a welded steel housing?
A) Reciprocating B) Open compressors C) Semi-hermetic compressors D) Hermetic compressors
Technician A says Type B misfires are emissions-threatening misfires. Technician B says Type A misfires are catalyst-damaging misfires. Who is correct?
A. A only B. B only C. Both A and B D. Neither A nor B