Explain the relationship of CO2 emission levels to the air/fuel ratio in the internal combustion engine.
What will be an ideal response?
CO2 emission levels are highest at the stoichiometric air/fuel ratio. These emissions decrease if the air/fuel ratio is rich or lean.
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Whenever an engine is disassembled, the piston rings are replaced.
Answer the following statement true (T) or false (F)
Pruning saws have long handles to give more leverage for cutting larger branches
Indicate whether the statement is true or false
NREL wind power resource maps classify every region in the US by Wind Power Class, ranging from ____, based on the average annual wind speed at heights of 33 ft and 164 ft above the ground.
A. 1 (poor) to 7 (superb) B. 1 (poor) to 10 (superb) C. 1 (poor) to 50 (superb) D. 1 (poor) to 100 (superb)
With ____, a clearance or interference can result due to the range of limits of the mating parts.
A. clearance fits B. interference fits C. transition fits D. locational fits E. none of the above