What is the intake valve diameter (in mm) required for good volumetric efficiency for a square internal combustion engine with two inlet valves, a speed of 7500 rpm, bore of 0.09 m, and inlet air temperature of 320 K, Assume specific heat ratio=1.3, R=287 J/kg.K, and an average inlet flow coefficient 0.45. Select one: a. 31.2 b. 40.0 c. 22.3 d. 27.2 e. 37.4

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