At a time when the outdoor temperature is at or near design temperature, heating or cooling equipment sized to the design parameters should _____.
a. cycle on and off frequently
b. be shut down for protection
c. run almost constantly
d. run longer at night than during the day
c. run almost constantly
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When a motor is oversized, a higher degree of overload protection can be provided by sizing the fuses based on the _____.
a. maximum motor current b. full-load current c. 75% of the full-load current d. 75% of the maximum motor current
Answer the following statement(s) true (T) or false (F)
A story pole is a job build tool to aid in the installation of vinyl siding.
For the most accurate superheat calculation _____________________________.
a. Take the suction pressure reading at the service valve and deduct 2 psig. b. Take the suction pressure reading where the suction line temperature is taken. c. Add 2 psig to the suction pressure. d. Use a pocket thermometer to check line temperature at the TEV bulb.
Why does the air's relative humidity affect comfort?
A) Human comfort is not affected by the relative humidity B) Water molecules in the air act as thermal conductors C) Water molecules in the air act as thermal insulators D) The relative humidity affects how rapidly perspiration can evaporate