Which type of flow-measuring device uses struts to create a partial obstruction to gas flow, caus-ing whirlpools to be produced when gas flows through it?
a. Monel pneumo-tachograph c. Vortex ultrasonic flowmeter
b. Ceramic pneumo-tachograph d. Variable-orifice pneumotachograph
ANS: C
The vortex ultrasonic flowmeter uses struts to create a partial obstruction to gas flow. As gases flow past these struts, whirlpools (or vortices) are produced. The frequency at which these whirlpools are produced is related to gas flow through the struts.
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