What speed should be used for the rotating drum of a water-sealed spirometer to measure volume changes during a forced vital capacity maneuver?
a. 16 mm/min c. 160 mm/min
b. 32 mm/min d. 1920 mm/min
ANS: D
The fastest speed (1920 mm/min) is used for recording volume changes during forced vital ca-pacity maneuvers.
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