Electric current that regularly reverses direction is called:
A) Ellipsoidal current. B) Potential current.
C) Direct current. D) Alternating current.
[Ques. 2] Alternating current is typically available in:
A) Single-phase and two-phase.
B) Single-phase, two-phase, and three-phase.
C) Single-phase and three-phase.
D) Unphased, positive-phased, and negative-phased.
[Ques. 3] How does reclaimed refrigerant differ from recovered or recycled refrigerants?
A) Reclaimed refrigerants can be put into new systems.
B) Reclaimed refrigerants cannot be reused.
C) Reclaimed refrigerants cannot be put back into the same system.
D) Reclaimed refrigerants can be reused.
[Ques. 4] The refrigerants that a particular recovery unit is designed for can be determined by:
A) Trying different refrigerants, measuring the unit amp draw, and comparing against the nameplate.
B) Looking for the AHRI/UL certification label.
C) Recovery machines must work with all refrigerants to be EPA certified.
D) Measuring the pressure and temperature of the refrigerant in the recovery unit and comparing them to a saturated pressure-temperature chart.
[Ques. 5] What material are most of the wires in your house made of?
A) Copper B) Steel C) Silver D) Gold
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