Why do we not try and adjust the CO2 percentage to the perfect stoichiometric percentage?
What will be an ideal response?
Safety. Excess air is added to insure complete combustion. This reduces the CO2 percentage by adding more air than is used in the combustion process.
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PROBLEM 2.4
A cast-iron tube is used to support a compressive load. Knowing that E = 69 GPa and that the maximum allowable change in length is 0.025%, determine (a) the maximum normal stress in the tube, (b) the minimum wall thickness for a load of 7.2 kN if the outside diameter of the tube is 50 mm.
Vitamin ____________________ is used to form the enzyme prothrombin, which in turn helps to form blood clots.
Fill in the blank(s) with the appropriate word(s).
The following statements are all correct EXCEPT ________
A) Used tires produce a heavy smoke when burned. B) Used tires can be burned in a furnace for winter heat C) Used tires can be breeding grounds for mosquitoes that carry disease. D) Used tires are difficult to dispose of in a landfill because they tend to rise to the surface.
Identify the two refrigerant lines that are attached to the compressor.
A. The exhaust and intake lines B. The suction and discharge lines C. The turbo and induction lines D. The liquid and vapor lines