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Based on which principle does the hydraulic governor works?

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Based on which principle does the hydraulic governor works?

(a) No inverting amplifier

(b) Inverted hydraulic amplifier

(c) Low pass filter

(d) High pass filter

This question was posed to me during an internship interview.

I'm obligated to ask this question of Diesel Engine Fuel Supply System in chapter Diesel Engine Fuel Supply System of Automotive Engine Design

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The correct answer is (b) Inverted hydraulic amplifier

The explanation: A hydraulic governor for example the CAV works on the principle of an inverted hydraulic amplifier wherein a small pressure changes in some part of the system producing in some other part, an opposite change of much greater amplitude.

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