Exhaust Back Pressure of an Engine Running at Idle Should

question 25

Multiple Choice

Exhaust back pressure of an engine running at idle should be ________.

• A) 2.5 PSI
• B) 1.5 in. Hg
• C) less than 1.5 PSI
• D) 2.5 in. Hg

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Law of Requisite Variety

This principle posits that in any system, control can be maintained only if the controller has as many response options as the system has variations.

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