The three types of seals are the packing seal, the radial lip seal, and the ____ seal.

A. O-ring
B. mechanical
C. compression
D. lantern ring


Answer: B

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Cutting conduit or larger conductors or tables is done by using a _____.

a. hacksaw b. hammer c. knife d. screwdriver

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If a compressor is energized but shows no activity on the gauges at all, yet an ammeter shows a very low current draw, the problem may be _____.

a. a broken crankshaft b. a damaged valve c. a burnout d. air in the system

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When holes are to be located on a circle, the ____ of the circle should be given so as to fix the exact center of each hole.

A. radius B. diameter C. arch D. circumference

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The d'Arsonval meter movement is operated by applying _____ current to the coil.

A. AC B. DC

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