Question 140Refrigeration & AC - 1st Asst/Chief

70% to pass

If outside air at 80 degrees F and 70 percent relative humidity is conditioned, what will be the resulting dew point temperature of the air just before it comes into contact with the cooling coil? Illustration GS-RA-22

Refrigeration Chief Question 140 diagram
A64 degrees F
B67 degrees F
C70 degrees F
D73 degrees F
AI Explanation

The correct answer is C) 70 degrees F. The dew point temperature of air at 80 degrees F and 70% relative humidity is 70 degrees F. This can be determined using a psychrometric chart or calculated using the appropriate formula. The air conditioning process does not change the dew point temperature, so the resulting dew point temperature of the conditioned air just before it contacts the cooling coil will also be 70 degrees F. The other options are incorrect because they do not represent the dew point temperature of the given air conditions. A) 64 degrees F, B) 67 degrees F, and D) 73 degrees F are not the correct dew point temperature for the specified air conditions.

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Official Resources
46 CFR Machinery & Electrical 46 CFR Engineering USCG National Maritime Center
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