AR in turbocharger terminology stands for area to radius ratio.

AR in turbocharger terminology stands for area to radius ratio.

• A. Area to Radius Ratio
• B. Area to Radius
• C. Air to Radius Ratio
• D. Are to Radius

Answer: (A)

AR stands for Area to Radius Ratio. This is a dimensionless parameter that describes turbine housing geometry by comparing the flow cross-sectional area to the turbine wheel radius. The phrase Area to Radius Ratio is the standard way to express this relationship, making it precise and unambiguous. The other options use the wrong word or misspellings, so they don’t match the established terminology used in turbocharger specs. In practice, a smaller AR generally spools the turbo faster but increases backpressure, while a larger AR flows more at high RPM but can slow spool.

AR stands for Area to Radius Ratio. This is a dimensionless parameter that describes turbine housing geometry by comparing the flow cross-sectional area to the turbine wheel radius. The phrase Area to Radius Ratio is the standard way to express this relationship, making it precise and unambiguous. The other options use the wrong word or misspellings, so they don’t match the established terminology used in turbocharger specs. In practice, a smaller AR generally spools the turbo faster but increases backpressure, while a larger AR flows more at high RPM but can slow spool.