The principle that gas flow is proportional to the pressure drop across a known resistance is used by which of the following devices?
a. Turbine flowmeter c. Fleisch pneumo-tachograph
b. Thermal flowmeter d. Ultrasonic pneu-motachograph
ANS: C
All pneumotachographs, except the ultrasonic pneumotachograph, operate on the principle that gas flow through them is proportional to the pressure drop that occurs as the gas flows across a known resistance.
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