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What is the shape of the lower pintle end in a throttling pintle type?

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in Automotive Engine Design by (137k points)
What is the shape of the lower pintle end in a throttling pintle type?

(a) Rectangle

(b) Truncated cone

(c) Sphere

(d) Circle

I got this question in class test.

I want to ask this question from Diesel Engine Fuel Supply System in division Diesel Engine Fuel Supply System of Automotive Engine Design

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Correct choice is (b) Truncated cone

Explanation: The pintle type nozzle carries an extension, which produces a hollow cone-type spray. The pintle is much longer and is also shaped like a truncated cone at its lower end. Such shape causes only a small amount of the fuel to be injected at the ignition start.

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