Sound Levels
In the case of sound levels, engine operation is of greatest impact with respect to mobile sources such as automobiles and trucks. Engine noise is a particularly large component of mobile source noise for vehicles operating at lower speeds, where aerodynamic and tire noise is less significant. Petrol and diesel engines are fitted with mufflers (silencers) to reduce noise.
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Famous quotes containing the words sound and/or levels:
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chorus: I thought I heard a sound within the house
Unlike the voice of one that jumps for joy.
He splits my skull, not in a friendly way,
Once more: he purposes to kill me dead”
—A.E. (Alfred Edward)
“The word which gives the key to the national vice is waste. And people who are wasteful are not wise, neither can they remain young and vigorous. In order to transmute energy to higher and more subtle levels one must first conserve it.”
—Henry Miller (1891–1980)