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What is the operating pressure in MPa of a pintle type nozzle?

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What is the operating pressure in MPa of a pintle type nozzle?

(a) 3-5

(b) 5-7

(c) 7-15

(d) 17-25

This question was posed to me in semester exam.

This interesting question is from Diesel Engine Fuel Supply System topic in section Diesel Engine Fuel Supply System of Automotive Engine Design

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Correct answer is (c) 7-15

For explanation: In pintle type nozzle the rate of injection increasing gradually as the pintle: protrudes further from the nozzle end. The opening pressure of the pintle type nozzle varies from 7 to 15MPa which gives more fuel uniformity.

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