Of the two single-ply roof membranes, EPDM and PVC, PVC is generally
A) less flexible but more fire resistant.
B) less flexible and less fire resistant.
C) more flexible but less fire resistant.
D) more flexible and more fire resistant.
A) less flexible but more fire resistant.
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The purpose of a standard control transformer is to:
A) Control the amount of power consumed by electric motors. B) Increase line voltage from 208 V to 230 V. C) Reduce line voltage to 24 V for HVACR control systems. D) Regulate the power supply voltage in an air conditioner.
In addition to being both flame-retardant and moisture-resistant, what characteristic does Type NMC cable have?
a. It can carry distribution voltages in excess of 60,000V. b. It can be used for direct burial. c. It can be used in ducts or plenums. d. It is fungus- and corrosion-resistant.
A rating of _________ IIC for the floor would be the most satisfying for individuals.
A. 45 B. 55 C. 65 D. 35
Which of these wrenches is recommended for loosening air conditioning refrigerant lines?
A) Box end wrench B) Open end wrench C) Combination wrench D) Flare-nut wrench