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28 May, 09:49

Which of the following will decrease volumetric efficiency in a reciprocating engine? 1. Full throttle operation. 2. Low cylinder head temperatures. 3. Improper valve timing. 4. Sharp bends in the induction system. 5. High carburetor air temperatures.

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  1. 28 May, 10:57
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    options 3,4,5 are the currect options

    Explanation:

    Volumetric efficiency in a reciprocating engine is defined as the ratio of the mass density of the air-fuel mixture drawn into the cylinder at atmospheric pressure (during the intake stroke) to the mass density of the same volume of air in the intake manifold.

    Volumetric efficiency of a reciprocating engine is decreased by

    - improper valve timing

    -sharp bends in the induction system

    - high carburetor air temperature.
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