If an R-12 refrigeration system has its air-cooled condensing unit on a 100°F roof and the condenser outlet temperature (refrigerant) is 115°F, with how much subcooling is the condenser operating?
A. 30°F
B. 15°F
C. 100°F
D. 130°F
Answer: B
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As a reminder that the regulator on a cylinder has left-handed threads, a V-notch is sometimes cut around the _____.
a. regulator b. cylinder c. threads d. nut
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Which of the following is a common cause of a concave root surface?
A. Insufficient filler metal B. Insufficient heat C. Poor shielding D. Contamination of the weld surface
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In their natural environment, hamsters live in and around the base of trees
Indicate whether the statement is true or false
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When working on electrical circuits, you may only wear metal framed eyeglasses if
a. the circuit is energized. b. you have a valid prescription. c. they are certified for high voltage. d. they are secured with a nonmetallic cord.
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