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.
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.
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