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3 cards from this section. Quick, good the night before a test.
What is excess air?
Think about why combustion would need more air than the ideal amount.
How is excess air calculated?
Consider what you divide and subtract in the formula.
What does excess air in combustion refer to?
Think about the difference between 'enough' and 'extra' air.
True or False: Excess air can increase combustion efficiency.
Consider what happens when there's too much air affecting fuel burn.
A combustion system used 300 kg of air for 150 kg of fuel while the stoichiometric requirement is 200 kg. Calculate the excess air and discuss the implications.
Follow the formula and reflect on what excess air would mean for combustion efficiency.
In a factory, engineers decide to operate their furnace with an air-to-fuel ratio resulting in 80% excess air. Assess the pros and cons and suggest the ideal range for air input.
Consider both the efficiency and environmental impact in your assessment.
5 more questions in this section. Enroll free to practise them all.
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