What is a No. 4 sieve? A No. 50 sieve?
What will be an ideal response?
A sieve is a screened pan used to sift particulate material larger than the voids in the screen. A No. 4 sieve has screen wires spaced 1/4 in. in each direction so that there are four wires in 1 in. A No. 50 sieve has 50 wires in 1 in.
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When cleaning up after a compressor burnout, immediately after you recover the refrigerant, you should:
A) Flush the system. B) Evacuate the system. C) Charge the system. D) Install filter driers.
Several types of safety signs may be posted at various locations inside the building. The signs are designed to ensure the safety of occupants. The FSD make sure that exit signs posted above doors are always .
A. illuminated B. made of tempered glass C. 3 inches above the door frame D. red with white lettering
The acronym AWS stands for ____.
A. American Welding Society B. Association for Welding Specifications C. American Welding Specifications D. American Welding Standards
If a concrete member is not a precast concrete member, can it prestressed? Explain.
What will be an ideal response?