Which type of pneumotachograph uses the Doppler effect to measure airflow velocity?
a. Fleisch c. Nonvortex
b. Screen type d. Variable-orifice
ANS: C
The nonvortex ultrasonic pneumotachograph estimates airflow by projecting pulsed sound waves along the longitudinal axis of the flowmeter. The theory is that the speed of the ultrasonic wave transmission is influenced by the rate of gas flow through the device, which is the Doppler ef-fect.
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