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The ________________ type of mixture control system, allows additional air to enter the carburetor between the main discharge nozzle and the throttle valve.

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The ________________ type of mixture control system, allows additional air to enter the carburetor between the main discharge nozzle and the throttle valve.

(a) back suction

(b) needle

(c) air port

(d) none of the mentioned

The question was posed to me in final exam.

My enquiry is from Altitude Compensation topic in section Carburetion of IC Engine

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Correct choice is (c) air port

Explanation: The air port type of mixture control system, allows additional air to enter the carburetor between the main discharge nozzle and the throttle valve whereas the needle type of mixture control system, restricts the flow of fuel through the metering system while the back suction type of mixture control system, reduces the effective suction on the metering system.

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