Nate Ac Service Certification Already Passed

A system is supplied from the factory with charge of 5 pounds 10 ounces for a 15 foot line set. The line set is 25 feet long. The manufacturer's instruction sheet specifies 0.6 ounces of refrigeration to be added for each added foot of refrigerant line set length. What is the total refrigerant charge for the system? A. 6 ounces B. 5 pounds C. 5 pounds 10 ounces D. 6 pounds {Ans: D. 6 pounds 15ft - 25ft = 10ft x .6 = 6 ounces 5 pounds + 10 ounces + 6 ounces 5 pounds + 16 ounces = 6 pounds}What is the maximum acceptable supply voltage tolerance for a 120 V circuit? A. +/-3% B. +/-5% C. +/-10% D. +10% / -15% {Ans: B. +/-5%}A duct 36 in. x 24 in. that has an average velocity of 600 fpm is handling: A. 3600 CFM. B. 2400 CFM. C. 1200 CFM. D. 1000 CFM. {Ans: A. 3600 CFM. CFM = Velocity x Area (ft.^2) CFM = 600fpm x ((36 x 24)/144)) (convert to sq. ft.) CFM = 600fpm x 6sqft CFM = 3600 CFM}What does a test of the compressor oil after a burnout indicate? A. Acidity