What conditions are required for flexible cords and attachment plugs to be used in hazardous areas?
What will be an ideal response?
When they are used, they must comply with the following conditions:
| 1. | Be approved for extra-hard usage. |
| 2. | Contain a separate grounding conductor. |
| 3. | Be properly connected to terminals or supply conductors. |
| 4. | Be supported by clamps in such a manner that no tension is transmitted to the terminal connection. |
| 5. | Be supplied with seals to prevent the entrance of flammable vapors in a Class I location, flammable dust in a Class II location, or the entrance of fibers in a Class III location. |
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A proposed heat engine is to produce 125 hp of power while receiving 160 Btu/s of heat. The engine receives heat at 1400 R and rejects heat at 650 R. Is this process possible?
Given: Proposed: TH = 1400 R; TC = 650 R; Q?H=160Btu/s; W?=125 hp=88.35Btu/s What will be an ideal response?
The Darwinian theory of organic evolution through natural selection affected American religion by
A. turning most scientists against religion. B. creating a split between religious conservatives who denied evolution and accomodationists who supported it. C. raising awareness of the close spiritual kinship between animals and human beings. D. causing a revival of the doctrine of original sin. E. sparking the rise of new denominations based on modern science.
Pest outbreaks are natural, but how have they been increased by intensive agricultural practices?
What will be an ideal response?
Spiral fluted taps are used:
A) To cut oversized threads B) To cut undersized threads C) To tap deep blind holes D) Because they tend to push chips ahead of them