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Author Question: Which statement is true concerning thermal flowmeters? a. Gas flow can be measured ... (Read 71 times)

dalyningkenk

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on: Jul 16, 2018
Which statement is true concerning thermal flowmeters?
 
  a. Gas flow can be measured bidirectionally.
  b. Gas velocity affects the amount of cool-ing.
  c. Cooling increases the resistance of a heated wire.
  d. Cooling decreases the resistance of a thermistor bead.

Question 2

Peak flowmeters are calibrated in which of the following units?
 
  a. liters/second c. milliliters/second
  b. liters/minute d. millimeters/minute


bblaney

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

ANS: B
Gas flow is calculated by the amount of power needed to maintain the temperature of the heating element. A high gas velocity will cool the heating element, requiring more power to maintain the temperature of the thermistor.

Answer to Question 2

ANS: B
Peak flowmeters operate by measuring the gas flow against a rotating vane. Peak flowmeters are usually calibrated in liters per minute.


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dalyningkenk

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Reply #2 on: Jul 16, 2018
Correct answers!


bblaney

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Reply #3 on: Jul 16, 2018
Great! Please up vote :D


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