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What is the use of bleed valve in flow type pneumatic comparator?

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What is the use of bleed valve in flow type pneumatic comparator?

(a) Zero adjustment

(b) Measurement of size

(c) Connect passage of air from plastic tube to gauging head

(d) Used with pressure reducing unit

I got this question by my college director while I was bunking the class.

The question is from Uses of Comparators in division Comparators of Engineering Metrology

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The correct option is (a) Zero adjustment

The explanation: Bleed valve in pneumatic comparator is used for zero adjustment. A screw is also present at the inlet of tapered glass tube by which magnification can be changed by passing some air supply from it.

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