good electrical connection should _____.

a. last for approximately 90 days without any maintenance or repairs
b. be mechanically and electrically secure
c. have a resistance of no more than 25 ohms
d. have a resistance of no more than 13 ohms


b. be mechanically and electrically secure

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When operating a vehicle with a dual air brake system the driver's should

A. Let the vehicle warm up before driving to ensure that the fuel reaches the engine. B. Let the air compressor build up a minimum of 100 psi pressure in the primary and secondary systems before driving. C. Begin driving just after the vehicle starts.

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Uneven rod bearing wear, and sometimes piston skirt wear, usually indicates a(n) ____.

A. tapered bearing journal B. valve clearance C. interference D. undersized crank

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Geothermal heat pumps get most of their heat from

A) the electricity used to operate the compressor B) the surrounding air C) the ground D) a separate gas fired boiler

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The number of threads per inch is referred to as _________

A) Grade B) Gauge C) Pitch D) None of these

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