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PFT EQUIPMENT PRACTICE QUESTIONS 2025 WITH ANSWERS What are the 3 types of volume displacement spirometers? - ....ANSWER ...- Water-seal, dry-rolling seal, and bellows type. What are the 5 types of flow-sensing spirometers? - ....ANSWER ...-Turbine device, heated wire flow sensors, pitot tube flow sensors, pressure differential flow sensors, and ultrasonic flow sensors. What are the advantages of the water seal spirometer? - ....ANSWER ...-As a patient breathes in and out, the bell floats up or down proportionally. The pin attached to the outer part of the bell, which marks the kymograph producing a recording of the amount and speed of the bell's deflection. It is very sensitive to very small changes in volume. It maintains calibration over a long period of time. What is the Collins water seal spirometer? - ....ANSWER ...-It has vertical 7-10 L cylinder. It can calculate VC and FEV1. On inspiration, the bell float moves down while the pen moves up (expiration vice versa). What are the disadvantages of the water seal spirometer? - ....ANSWER ...- Cumbersome and not very portable, potential contamination due to water spills, and challenging to keep the device clean. ...©️ 2025, ALL RIGHTS RESERVED 1