HC and CO are high and CO2 and O2 are low. This could be caused by a ________
A) Lean mixture B) Clogged EGR passage
C) Rich mixture D) Defective ignition component
C
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In air carbon arc cutting, the air must be aimed ____ the electrode.
A. just under and behind B. just above and behind C. just under and ahead of D. just above and ahead of
You define a closed system in which a chemical reaction A+B?C is occurring, and write an energy balance. How does the presence of the reaction affect the writing of the energy balance?
A. The ?Uterm is replaced by a ?G. B. The potential energy terms take into account the electron shell changes of the valence electrons of the reacting species’ atoms. C. The accumulation term in the energy balance is negative, because there are more moles of reactant than product. D. The reaction doesn’t affect the terms themselves, it only influences the values of the terms. E. The ?Htermsare replaced with ??H_R^0, or equivalent for the reaction temperature.
Sketch the usual architectural materials symbol for batt insulation.
What will be an ideal response?
What is the difference between depreciation and depletion?
What will be an ideal response?