Describe the circuit considered in this chapter.
What will be an ideal response?
A housing development contains one pressure tank that supplies water to the development. There are two separate deep wells, however, that supply water to the tank. It is desired that the wells be used equally. The circuit will cause the pumps to alternate running each time the pressure switch closes. A selector switch can be set to any of three operating modes. In the auto mode the circuit will operate automatically and permit the pumps to alternate running each time the pressure switch closes. The selector switch can also be set to permit only one of the pumps to operate each time the pressure switch closes in the event that one pump fails. An on-off switch can be used to stop all operation of the circuit.
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An average home in the United States consumed about 12,773 kWh of electricity in 2005. The national average carbon dioxide emission rate for electricity generated in 2007 was 1,293 lbs. of CO2 per megawatt-hour. Approximately 7% of the electricity generated is wasted due to losses in the transmission and distribution system.
a. How much CO2 was generated per year for an average U.S. home due to electricity use? b. How much CO2 was emitted from household use of electricity is there were 111.1 million homes in the United States in 2005? c. How much CO2 will be emitted from household use of electricity if there are 166 million homes in the United States in 2050? What will be an ideal response?
What is usually installed into the Ni-Resist insert of a piston assembly?
A. upper compression ring B. wrist pin C. piston skirt D. oil control ring
Glulam members are generally made using 2-by (1-1/2 -in.-thick) lumber members, but in some situations we use 1-by (3/4-in.-thick) lumber members. Which are these situations?
What will be an ideal response?
A simple way to delete a record using ____ is with the -d (delete) option.
A. awk B. sed C. test D. tr