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Which of the following is true for Pneumatic sensitivity in pneumatic comparators?

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Which of the following is true for Pneumatic sensitivity in pneumatic comparators?

(a) Directly proportional to operating pressure

(b) Inversely proportion to operating pressure

(c) Directly proportional to geometrical area of orifice

(d) Independent of area of orifice and operating pressure

The question was asked in examination.

My question is from Pneumatic Comparators topic in section Comparators of Engineering Metrology

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Right answer is (a) Directly proportional to operating pressure

The best explanation: Pneumatic sensitivity in the pneumatic comparator is directly dependent upon the operating pressure and inversely proportional to the geometrical area of the orifice. It can be represented as dp/dM.

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