The evaporator coil operating temperature for a system with a 20F split, 85F return air, and 71F supply air is:
A) COT = ((85F - 71F)/2 ) - 20 = 58F. B) COT = 85F - 20 = 75F.
C) COT = ((85F - 71F)/2 ) + 20 = 98F. D) COT = 71F - 20 = 51F.
[Ques. 2] What does hygroscopic mean?
A) A material that is totally incompatible with water is hygroscopic.
B) A material that readily absorbs water is hygroscopic.
C) It refers to a method of growing plants in water without soil.
D) A percentage moisture measurement taken with a hygroscope is referred to as the hygroscopic index.
[Ques. 3] What kind of chart is required when calculating the liquid-line subcooling?
A) Temperature difference chart B) Pressure-temperature chart
C) Refrigerant pressure chart D) Atmospheric pressure chart
[Ques. 4] A cooling tower in which air flow is produced by natural convection due to the density difference between the heated air in the tower and the cooler outside air is called:
A) An induced draft tower. B) A mechanical draft tower.
C) A draft-free tower. D) An atmospheric draft tower.
[Ques. 5] Which of the following is a critical operating parameter that should always be checked on water-source systems?
A) TEV adjustment B) Suction pressure
C) Water flow D) Discharge pressure
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