Which of the following types of compressor can accommodate a ...

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Which of the following types of compressor can accommodate a mechanical ventilator? 1. Diaphragm 2. Liquid air 3. Rotary 4. Piston
 
  a. 1 c. 3 and 4
  b. 2 and 4 d. 1, 3, and 4

Question 2

During your home care visit on Monday morning, you weigh the patient's portable liquid oxygen reservoir. The liquid oxygen weighs 18 lb, and the patient is using 2 L/min. When should you schedule a visit to fill up the reservoir?
 
  a. The next Monday c. Thursday afternoon
  b. Wednesday morn-ing d. Friday afternoon

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Answer to Question 1

ANS: C
Rotary compressors use a rotating vane to compress air from an intake valve. As the rotating vane turns, gas is drawn into the cylinder through a one-way valve (Figure 3-16). The rotor turns, which causes the gas to be compressed as the oval-shaped cylinder becomes smaller. The com-pressed gas is then forced out of the compressor through another one-way outflow valve. Low-pressure rotary compressors are used in ventilators such as the Bennett MA-1. Piston com-pressors use the action of a motor-driven piston to compress atmospheric air. The piston is seated within a cylinder casing and is sealed to it with a carbon or Teflon ring. Figure 3-14 illustrates the operational principle of a typical piston air compressor used to power a mechanical ventilator.

Answer to Question 2

ANS: B
18 lb/2.5 lb/L=7.2 L. 7.2 L  860 = 6192 L/2 L/min = 3096 minutes, or 51 hours 36 minutes, which is 2 days 3 hours 36 minutes. So it would have to be filled on Wednesday.