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Which of the following option is correct for velocity type pneumatic gauge?

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Which of the following option is correct for velocity type pneumatic gauge?

(a) Operate by sensing momentary rate of flow of air

(b) Response speed is less than back pressure type

(c) Low amplification

(d) Filter is placed after pressure reducing unit

I have been asked this question by my college director while I was bunking the class.

This intriguing question comes from Pneumatic Comparators topic in division Comparators of Engineering Metrology

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Correct answer is (a) Operate by sensing momentary rate of flow of air

Easy explanation: It is operated by sensing momentary air flow rate. This flow can be sensed by a tapered glass tube which is mounted on a graduated scale. Inside this bore a float is present which is lifted by the air flow.

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