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Practice Final Exam
| Question | Answer |
|---|---|
| What is the absolute humidity (water vapor content) of saturated gas at normal body temperature (37°C)? A) 47.0 mg/L B) 37.0 mg/L C) 98.6 mg/L D) 43.8 mg/L | D) 43.8 mg/L |
| What is the change in state of a substance from liquid to gaseous form occurring below its boiling point? A) Evaporation B) Sublimation C) Boiling D) Vaporization | A) Evaporation |
| Which of the following would be the worst heat conductor? A) Water B) Glass C) Air D) Copper | C) Air |
| The peak pressure on a ventilator reads 40 cm H2O. What is the equivalent pressure in mm Hg? A) 37.0 mm Hg B) 29.6 mm Hg C) 68.3 mm Hg D) 4.9 mm Hg | B) 29.6 mm Hg |
| Which of the following is a good clinical example of using the principle of convection to transfer heat? Humidifiers with immersion heaters. Heated, enclosed infant incubators. Wire-heated pneumotachometers. Heated ventilator exhalation valves. | B) Heated, enclosed infant incubators. |
| In what processes of gas compression or expansion does the temperature remain constant? A) Isothermal B) Adiabatic C) Hypothermal D) Neutral kinetic | A) Isothermal |
| Which of the following occurs when water vapor is added to a dry gas at a constant pressure? The volume occupied by the gas mixture increases The relative humidity of the mixture increases The partial pressure of the original gas is reduced | I. The volume occupied by the gas mixture increases. II. The relative humidity of the mixture increases. III. The partial pressure of the original gas is reduced B) I, II, and III B) I, I |
| Which of the following medical gases can be maintained in the liquid form at room temperature? I. Nitrous oxide II. Carbon dioxide III. Oxygen IV. Helium A) I and II B) II, III, and IV C) II and III D) II and IV | I. Nitrous oxide II. Carbon dioxide A) I and II |
| Which of the following factors determine how much of a given gas can dissolve in a liquid? I. Solubility coefficient of the gas. II. Temperature of the liquid. III. Gas pressure above the liquid. | D) I, II, and III I. Solubility coefficient of the gas. II. Temperature of the liquid. III. Gas pressure above the liquid. |
| If the absolute humidity in a medical gas being delivered to a patient is 14 mg/L, then what is the body humidity (BH)? A) 7% B) 16% C) 24% D) 32% | D) 32% |
| What is the water vapor pressure of saturated gas at normal body temperature (37°C)? A) 47.0 mm Hg B) 43.8 mm Hg C) 37.0 mm Hg D) 98.6 mm Hg | A) 47.0 mm Hg |
| One atmosphere (1 atm) of pressure is equivalent to which of the following? I. 29.9 inches Hg II. 14.7 lb/in2 III. 1034.0 g/cm2 IV. 760.0 mm Hg | I. 29.9 inches Hg II. 14.7 lb/in2 III. 1034.0 g/cm2 IV. 760.0 mm Hg D) I, II, III, and IV |
| Respiratory therapists must ensure that any oil or dust is cleared from high-pressure medical-gas delivery systems before pressurization. Why is this action needed? | D) Adiabatic compression could ignite the oil or dust. |
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Cam1228
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