Answer:
Freon Refrigerant
Explanation:
As of January 1, 2020 Freon Refrigerant can no longer be manufactured or imported to the United States. This is because R-22 (the principal component in Freon) has been banned in the states. Along with other greenhouse gasses, due to their contribution to damaging Earth’s ozone layer and global warming.
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Answer: True
Explanation: Closed loop relies on feedback from PNS to make modifications in the movement, open loop allows action in the absence of feedback, 2. ... Closed loop can change the initial commands, open loop can not change the initial commands.
CORRECTLY PLACED:
Large-lite glazing requires consideration of the following (select all that apply)
a. glazing must be supported without imparting stresses.
b. glazing must be supported against wind loads.
c. gaskets must separate glazing and frame.
d. glazing must be vacuum-insulated e. weep holes must be provided in the horizontal mullions.
Answer: a, b, c and e.
Explanation:
When large-lite glazing is done, options a, b, c and e must be considered. But vacuum-insulation isn't necessary, so option d. isn't part of the considerations.
Answer:
<em>d. floor spans exceed that which is economical with site-cast or hollow-core slabs and exceed 60 feet.</em>
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Explanation:
<em>
Double tee slabs are prestressed concrete castings usually about 100 m to 150 m long</em>. <em>They are usually used in the construction industry in structures requiring a long floor span (or roof span) exceeding 60 feet in length, that is required to bear additional load (additional load carrying capability</em>). Double tee slabs are usually employed in construction because they shorten construction time. reduce congestion at the construction site, and also reduce construction cost.
<em>They are the required choice in construction when the cost of site casting or hollow-core slabs is no longer economical due to the length of the structure exceeding 60 feet.</em>