NEC Article 701 states that legally required ____________________ systems are those systems required by municipal, state, federal, or other code or a government agency having jurisdiction.

Fill in the blank(s) with the appropriate word(s).


standby power

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Technician A says a dog clutch utilizes roller bearings held in place by springs to separate the inner and outer race of theclutch assembly. Technician B says one-way overrunning clutches can be either roller type or sprag type. Who is correct?

A. A only B. B only C. Both A and B D. Neither A nor B

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The most effective method of checking the heating elements of an electric furnace during operation is

A) Checking the Amp draw of each heat strip B) Checking the resistance of each heat strip C) A visual inspection D) Measuring the temperature of each heat strip

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Solve this proportion. If a piece of cable 160 feet long costs $60, what will 500 feet of the same cable cost?

Fill in the blank(s) with the appropriate word(s).

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How does an economizer reduce HVAC operating costs?

a. It reduces compressor speed. b. It uses cool outdoor air for cooling. c. It uses a variable-speed blower motor. d. It runs during off-peak energy use hours.

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