What must be done when charging a zeotropic refrigerant into an operating system?

A) Charging by superheat.
B) Charging liquid through a metering orifice on the low-pressure side.
C) Inverting the refrigerant cylinder.
D) Adding charge only through the high-pressure side.


Answer: B

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Surface nonmetallic raceways and their fittings must be designed so that sections can be mechanically coupled together and installed without subjecting the wires to ____.

A. bending B. abrasion C. compression D. tension

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A zener diode is normally used for voltage regulation. A zener diode, however, can also be used for high voltage spike protection if connected ________

A) Positive to anode, negative to cathode B) Negative to anode, cathode to a resistor then to a lower voltage terminal C) Positive to cathode, ground to anode D) Both A and C

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OSHA can only make recommendations concerning penalties and citations when employers are found guilty of violations.