Bidirectional flow can be measured by which of the following devices?
a. Turbine flowmeter
b. Piezoelectric transducer
c. Ultrasonic vortex flowmeter
d. Variable orifice pneumotachometer
ANS: D
The turbine and ultrasonic flowmeters are inaccurate with bidirectional flows. The piezoelectric transducer measures airway pressures. The variable orifice pneumotachometer is a bidirectional flow measuring device.
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