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What is the opening pressure range in MPa of a hole-type nozzle?

(a) 5-7

(b) 10-17

(c) 17-34

(d) 37-54

I have been asked this question in an international level competition.

My doubt stems from Diesel Engine Fuel Supply System in section Diesel Engine Fuel Supply System of Automotive Engine Design

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The correct option is (c) 17-34

The best I can explain: The opening pressure of the hole-type nozzle varies from 17 to 34MPa. Due to which the hole type fuel injector has good fuel atomization and this happens in a proper quantity. And the fuel is injected in the cylinder properly.

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