The reading from a wet-bulb thermometer ____.
A. is the same as the wet-bulb depression
B. is the saturation pressure
C. takes into account the moisture content of the air
D. is always higher than the dry-bulb temperature
Answer: C
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When retrofitting a system from R-12 to R-134a, what is required to be done?
A) Replace the receiver-drier B) Convert the fittings C) Install a label D) All of the above
Hoisting or rigging operations must be halted when the temperature is _____.
a. over 90°F b. low enough that hoist or crane steel structures could fracture upon shock or impact c. below 32°F d. high enough that workers may suffer heat exhaustion if they don't take precautions
SEER is calculated based on the total amount of cooling (in BTU) the system will provide over the entire season, divided by the total number Watt-Hours it will consume.
Answer the following statement true (T) or false (F)
The process of combustion occurring without an open flame is called ________
A) Cold fusion B) Non-flame combustion C) Direct ignition D) Spontaneous combustion