Many ____ use the pressure of refrigerant in a sealed system to sense temperature.

a. differential thermostats
b. programmable thermostats
c. staging thermostats
d. line voltage thermostats


d. line voltage thermostats

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A commercial project requires the installation of 127 square yards of carpet. Using a productivity rate of 0.108 labor hours per square yard and a productivity factor of 1.05, determine the number of labor hours required to install the carpet.

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Alternating current frequency is measured in:

A) Watts. B) Amps. C) Volts. D) Hertz.

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