The amount of outside air introduced can be controlled using
A) an N2 sensor B) a CO2 sensor C) a CO sensor D) an O2 sensor
B
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What is the main function of the impeller in a centrifugal chiller?
a. Make the refrigerant flow faster b. Cool the refrigerant c. Vaporize the refrigerant d. Raise the pressure of the refrigerant
Why should an AC generator never be operated open-circuit?
A. It could overcharge the battery B. It could burn out electronic components C. It could damage the AC generator stator D. None of the above
5 is what percent of 2,000?
A) 0.25% B) 400% C) 2.5% D) None of these
How much would system capacity be increased by subcooling the liquid refrigerant leaving the condenser an extra 12°F?
A) 12°F × 1%/°F = 12% increased capacity B) Subcooling does not increase system capacity. C) 12°F × 5%/°F = 60% increased capacity D) 12°F × 0.5%/°F = 6% increased capacity