When is the three-way catalyst most efficient?
What will be an ideal response?
Three-way catalysts are most efficient when the air/fuel ratio is maintained at 14.7:1, the stoichiometric point.
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Using too much water when cleaning brickwork will cause streaking.
Answer the following statement true (T) or false (F)
Resistors are used for three main purposes in an electrical circuit. Resistors limit the current flow through a circuit, divide voltage, and _____?
A. store energy B. give off heat C. permit current to flow in only one direction D. amplify voltage
The material usually added to an oil to form a grease is _____.
a. wax b. corn starch c. soap d. pectin
There are a number of techniques to help people stop smoking, but their cost and effectiveness vary widely. One accepted measure of effectiveness of a program is “percentage of enrollees quitting.” The table in this problem shows several techniques touted as effective stop-smoking methods, some historical data on the approximate cost of each program per person, and the percentage of people smoke-free 3 months after the program ended. The Cancer Society provides annual cost-offset funding to cancer patients so more people can afford these programs. A large clinic in St. Louis has the capacity to treat each year the number of people shown. If the clinic plans to submit a proposal to the Cancer Society to treat a specified number of people annually, estimate the amount of money the
clinic should ask for in its proposal to do the following:
(a) Conduct programs at the capacity level for the technique with the lowest cost-effectiveness ratio.
(b) Offer programs using as many techniques as possible to treat up to 1100 people per year using the most cost-effective techniques.
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