Exam 6: Physical Principles of Respiratory Care

According to Pascal's principle, the pressure exerted by a liquid in a container depends on which of the following? 1) Depth of the liquid 2) Density of the liquid 3) Shape of the container

What is the density of a mixture of 40% oxygen (O₂) and 60% helium at STPD?

Assuming a constant flow, what will happen to a fluid if the cross-sectional area of the tube in which its flows decrease?

Both a compressed gas cylinder and its regulator are at room temperature with all valves in the off position. After the cylinder is opened and gas begins flowing, you note that the regulator is extremely cold to touch. Which of the following principles best explains this observation?

During some pulmonary function tests, saturated gas exhaled from a patient's lungs is gathered at room temperature. Which of the following correction-factor tables would you use to determine what volume this gas occupied in the patient's lungs?

You obtain a mercury barometric reading of 760 mm Hg at 17° C. Using the following factor table, compute the corrected pressure.

Which of the following represents a direct measure of the kinetic activity of water vapor molecules?

What is the most common application of Bernoulli's principle in respiratory care equipment?

What is the motion referred to when solid molecules travel until they collide?

According to Avogadro's law, under standard conditions of temperature and pressure (0° C and 760 mm Hg), 1 mol of any gas occupies which of the following?

Which of the following are true about boiling? 1) Boiling a liquid requires more energy than does evaporating it. 2) A liquid's boiling point varies with the atmospheric pressure. 3) The greater the ambient pressure, the lower is the boiling point.

The resistance to flow of a fluid through a tube can be computed according to which of the following formulas?

Which of the following occurs when the temperature of a gas rises? 1) The kinetic activity of the gas increases. 2) The rate of molecular collisions increases. 3) The pressure exerted by the gas rises.

What occurs during the evaporation of water?

The American National Standards Institute has set a water vapor content level of 30 mg/L as the minimum absolute humidity required for patients whose upper airways have been bypassed. This equals what body humidity (BH)?

What is the temperature at which the vapor pressure of a liquid equals the pressure exerted on the liquid by the surrounding atmosphere?

With all else equal, under which of the following conditions would the drop in pressure occurring while a fluid flows through a tube be greatest?

Which of the following best describes the physical concept of pressure?

Which of the following are true of liquids? 1) They are easy to compress. 2) They exert pressure. 3) They exert buoyant force. 4) They conform to their containers.

By which of the following means can the internal energy of a substance be increased? 1) Cooling the substance 2) Performing work on the substance 3) Heating the substance