Answer the following statement(s) true (T) or false (F)
1. In the United States and Canada, power is generated as a three-phase 50-hertz voltage.
2. An alternator is a generator that produces AC voltage.
3. Wye-connected systems often use a fourth conductor connected to the back of the connection.
4. A type of three-phase service is known as the open delta.
5. The three-pole breaker cannot be used in a single-phase panel.
1. FALSE
2. TRUE
3. FALSE
4. TRUE
5. TRUE
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The New England economy depended heavily on
A. slave labor. B. the production of many staple crops. C. fishing, shipbuilding, and commerce. D. tobacco. E. rice production.
Select the components that are found in a furnace. (Select all that apply.)
a. Radiant tubes b. Bridgewall c. Fuel valve d. Tube sheet
For a carbon steel piping and flange system that is 6-inch schedule 40 with class 600 flanges operating at a max of 400°F, what is the MAWP?
a. 1200 b. 1205 c. 1270 d. 2062
After windows, doors, and skylights are installed, the space between the frame and the structure must be sealed against air infiltration. This is typically accomplished with ____ insulation designed specifically for this purpose.
A. low-expansion spray foam B. flexible plastic C. rubber D. PVC