List three reasons an arcing incident may occur._______________________________________________________________________________________________________________________________________________________________________________________________________________
What will be an ideal response?
Human error
Screwdriver slips and shorts together energized parts
Metal object falls into a panel and shorts together energized parts
Overcurrent device improperly sized
Incorrect replacement fuse or breaker installed
Overcurrent device failure
Break or cut in conductor insulation contacts enclosure, fitting, or raceway
Corrosion of a film of dust, oil, or other contaminants creates arcing path
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A household refrigerator has a coefficient of performance of 3.25, and is able to remove heat from its interior at a rate of 1.82 kW. Determine the power used in the compressor to operate the refrigerator.
Given: ? 3.25; Q?C = 1.82 kW Assume: The refrigerator is operating in a cyclic fashion. What will be an ideal response?
Most American writers and cultural commentator before World War I had celebrated American democracy and politics. Why did the 1920s produce a cultural critic like H.L. Mencken who mocked democracy and middle American values? Was Mencken's criticism itself a healthy reflection of democracy or the sign of a dangerous cynicism entering American life?
What will be an ideal response?
Net primary (photosynthetic) productivity (NPP) is:
A) the carbon fixed by the leaves of the plant and not secondary photosynthesizing organs. B) the amount of biomass that goes into the harvested part of the plant. C) carbon fixed plus the amount given off through respiration. D) carbon fixed minus the amount given off through respiration.
The weep hole on a water pump is located where?
A) Between the bearing and the engine B) Between the impeller and the seal C) Between the seal and the bearing D) Any of the above, depending on engine