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Home Test Bank Mosbys Respiratory Care Equipment 9th Edition By J.M. Cairo – Test Bank
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Mosbys Respiratory Care Equipment 9th Edition By J.M. Cairo – Test Bank

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Edition:  9th Edition

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Mosby Respiratory Care Equipment 9th Edition By J.M. Cairo – Test Bank

Chapter 04: Administering Medical Gases: Regulators, Flowmeters, and

MULTIPLE CHOICE

1. What device helps reduce high-pressure gases from cylinders or bulk storage units to a lower working pressure?

a.

Regulator

c.

Bourdon gauge

b.

Kinetic tube

d.

Thorpe tube

ANS: A

The regulator is the only device in which pressure is regulated. The other devices relate to flow.

PTS: 1 REF: Page 84

2. The chamber located above the diaphragm of a single-stage regulator is which of the following?

a.

Lower chamber

c.

High-pressure chamber

b.

Pressure-relief valve

d.

Adjustable regulator

ANS: C

The high-pressure chamber is located above the diaphragm and contains a valve stem that will close the inlet when the pressure reaches its setting.

PTS: 1 REF: Page 84

3. The gas flow into the high-pressure side regulator is dependent on what two opposing forces?

1. Gas pressure above the diaphragm

2. Gas pressure at the diaphragm

3. Spring tension below the diaphragm

4. Spring tension above the diaphragm

a.

1 and 3

c.

2 and 4

b.

2 and 3

d.

1 and 4

ANS: A

When the force offered by the high-pressure gas above the diaphragm equals the force offered by spring tension, the diaphragm is straight and the inlet valve is closed.

PTS: 1 REF: Page 84

4. Delivered pressures on common adjustable regulators are between _____ and ____ pounds per square inch gauge (psig).

a.

0; 50

c.

50; 100

b.

0; 100

d.

50; 200

ANS: B

Most adjustable regulators can be set to deliver pressure between 0 and 100 psig.

PTS: 1 REF: Page 84

5. Which regulator supports the theory that gas pressure is gradually reduced as gas flows from a high-pressure source through a series of stages to the outlet?

a.

Single-stage regulator

c.

Preset regulator

b.

Flowmeter

d.

Multistage regulator

ANS: D

Gas from a compressed cylinder (e.g., 2200 psig) enters the first stage of a two-stage regulator, and the gas pressure is reduced to an intermediate pressure (e.g., 700 psig). This lower-pressure gas then enters into the second stage of the regulator, where the gas pressure is further reduced to the desired working pressure (e.g., 50 psig) before the gas reaches the outlet.

PTS: 1 REF: Page 85

6. Which device is more precise in terms of controlling gas pressure?

a.

Bourdon flowmeter

c.

Multistage regulator

b.

Thorpe tube flowmeter

d.

Flow restrictors

ANS: C

Multistage regulators can control gas pressure with more precision than single-stage regulators because the pressure is gradually reduced.

PTS: 1 REF: Page 85

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