In a high-temperature refrigeration unit, the boiling point of the refrigerant in the coil is normally ____ lower than the cabinet temperature.
A. 10°F to 20°F
B. 25°F to 35°F
C. 35°F to 46°F
D. 5°F to 15°F
Answer: A
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Compressed air systems provide air pressure between _____ psig.
a. 0 and 50 b. 50 to 125 c. 125 to 175 d. 175 to 225
Technician A says that headers do not improve performance at low rpm unless they are specifically tuned for low rpm use. Technician B says that longer header pipes tend to improve low rpm performance. Who is right?
A. ?Technician A only B. ?Technician B only C. ?Both A and B D. ?Neither A nor B
A technician takes the following readings while checking the operation of an electric furnace with two heat strips: 220 V, 36 A, 70°F return air temperature, and 120°F supply air temperature. What is the airflow through the furnace?
A) = = 540 CFM B) = = 158 CFM C) (120 — 70 ) × 1.08 × 10 = 540 CFM D) = = 500 CFM
Shop-built stairs are usually smaller than the finished width of the stairwell by _____
a. 1/2? b. 1? c. 1-1/2? d. 2?