Melting alloy and bimetallic overload relays are designed to _____.
a. trip an alarm signal
b. approximate the heat generated in the motor
c. react to changes in ambient temperature
d. melt under overcurrent loads
b. approximate the heat generated in the motor
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________: unemployment associated with business fluctuations.
Fill in the blank(s) with the appropriate word(s).
What must be done when charging a zeotropic refrigerant into an operating system?
a. Charging by superheat b. Charging liquid through a metering device into the suction service port c. Inverting the refrigerant cylinder d. Adding charge only through the high-pressure side
Which of the following describes a Myers hub?
a. An enclosure used with underground systems b. An enclosure where one or more raceways enter c. A gasketed fitting used to provide watertight conduit connection d. A precision-molded box with a cover and gasket designed to provide a tight seal
The Three E’s of safety are ____________, ___________ and ____________.
Fill in the blank(s) with the appropriate word(s).