Single-phase AC power is used:
A) Only in Europe. B) In both residential and commercial buildings.
C) Only in residences. D) Only in commercial buildings.
[Ques. 2] The fastest method for charging a large system that holds 50 lb of refrigerant is to add:
A) Liquid into the king valve with the king valve front-seated and the system operating.
B) Liquid into the suction service valve with the system running.
C) Vapor into the suction service valve with the system off.
D) Vapor into both the suction service valve and king valve with the system off.
[Ques. 3] To avoid falling, when working above a sheetrock ceiling technicians should:
A) Walk quickly whenever it is necessary to walk directly on the sheetrock.
B) Walk slowly whenever it is necessary to walk directly on the sheetrock.
C) Step only on the sheetrock between the ceiling joists.
D) Step only on the ceiling joists.
[Ques. 4] An air conditioner with a thermostatic expansion valve is operating with a condenser saturation temperature of 110F and a liquid-line temperature of 85F. The factory-specified subcooling for the current operating condition is 10F. After checking the condenser coil and airflow, the technician should:
A) Add charge because the system is undercharged.
B) Leave the charge alone because it is cooling even better than factory specifications.
C) Move some of the charge from the low side of the system to the high side of the system to balance the charge.
D) Recover charge because the system is overcharged.
[Ques. 5] Capacitance meters measure the capacitance in a circuit or in a start capacitor. This is measured in what unit?
A) Amps B) Ohms C) Microfarads D) Volts
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