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Author Question: Which type of pneumotachograph uses the Doppler effect to measure airflow velocity? a. Fleisch c. ... (Read 44 times)

genevieve1028

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on: Jul 16, 2018
Which type of pneumotachograph uses the Doppler effect to measure airflow velocity?
 
  a. Fleisch c. Nonvortex
  b. Screen type d. Variable-orifice

Question 2

Which of the following devices is bidirectional?
 
  a. Turbine flowmeter c. Vortex ultrasonic flowmeter
  b. Screen pneumo-tachograph d. Variable-orifice pneumotachograph


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shoemake

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Reply #1 on: Jul 16, 2018
Answer to Question 1

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.

Answer to Question 2

ANS: D
The variable-orifice pneumotachograph is a disposable, bidirectional, flow-measuring device that uses a flexible obstruction with a variable area for measuring flow as a function of the pressure differential generated by the obstruction. Turbine flowmeters, thermal anemometers, and vortex ultrasonic flowmeters are all unidirectional.


genevieve1028

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Reply 2 on: Jul 16, 2018
Great answer, keep it coming :)

Bigfoot1984

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Reply 3 on: Yesterday
Wow, this really help

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