What is the function of a purge unit?
A) A purge unit is used to purge the superheat from the condenser.
B) A purge unit is used to purge the air out of the chilled water loop.
C) A purge unit is used to purge the refrigeration oil out of the refrigerant.
D) A purge unit will purge the air from the top of the condenser.
D
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According to the 29 CFR 1926, toeboards shall be _____ .
A. a minimum of 4" in height B. no more than 3" in height C. exactly 5" in height D. a maximum of 4" in height
A multiple evacuation means that ____.
A. you connect three vacuum pumps simultaneously to a refrigeration system and pull a vacuum B. you pull a vacuum on three different systems at the same time C. you pull a vacuum on a refrigeration system more than once, allowing refrigerant or nitrogen into the system between each procedure D. there must be more than one system operating before a vacuum can be pulled
Write the following differential equations in D-operator form:
What will be an ideal response?
How many wall ties are needed for a brick wall 43' long and 10' tall if the spacing of ties is 24" x 16"? Round the answer to the nearest whole number.
What will be an ideal response?