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The purpose of the barometric correction in a carburettor is to..
  • A
    increase the fuel to air mass ratio when the altitude increases.
  • B
    maintain the correct fuel to air mass ratio when the altitude increases.
  • C
    reduce the fuel to air mass ratio when the altitude decreases.
  • D
    maintain a constant fuel flow irrespective of the altitude.
In order to compensate for the barometric effect of changing air density varying with the change in altitude, a mixture control valve is fitted. The valve is either manually controlled or operated automatically by an aneroid capsule that senses the atmospheric pressure changes and supplies additional air to the main mixture circuit of the carburetor so that the correct fuel to air mass ratio is maintained with increasing altitude.
 

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