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9. An engine is fitted with a single jet carburetor having a jet diameter of 1.25 mm has a fuel consumption of 6 kg/hr. The specific gravity of the fuel is 0.7. The level of the fuel in the float chamber is 5 mm below the top of the jet when the engine is not running. Ambient conditions are 1 bar and 17°C. The fuel jet diameter is 0.6 mm. The discharge coefficient of air is 0.85. Air-fuel ratio is 15. Determine the critical velocity of flow at throat and the throat diameter. Express the pressure at throat in mm of water column. Neglect water column. Answer: (0) 6.43 m/s (1) 20 mm (ii) 360 mm of water