Anesthesia Machine: Flow Restrictors and Gas Escape

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Why is the gauge designed to vent escaping gas through the back of the casing?

To protect other parts of the anaesthesia machine from potential damage caused by high pressure gases (correct)
To maintain a constant flow of gas
To increase the efficiency of the anaesthesia machine
To reduce the weight of the gauge

What is the purpose of the heavy glass face on the pressure gauge?

To enhance the aesthetics of the anaesthesia machine
To regulate the pressure inside the anaesthesia machine
To protect the gauge from damage in case of failure or malfunction (correct)
To prevent pressure surging

What is the role of pressure regulators in an anaesthetic machine?

To increase variable cylinder pressure
To reduce gas leaks
To convert variable, high pressures to constant lower output pressures (correct)
To cause pressure surging

Why are regulators positioned between cylinders and the rest of the anaesthetic machine?

To protect low-pressure components against pressure surges (A) Signup and view all the answers

How do pressure regulators help in minimizing the consequences of gas leaks?

By converting high pressures to low constant pressures (A) Signup and view all the answers

In what condition are regulators necessary in an anaesthetic machine?

When variable cylinder pressures need to be maintained (B) Signup and view all the answers

What is the purpose of using interactive oxygen and nitrous oxide controls in modern anaesthetic machines?

To prevent the delivery of hypoxic mixtures to the patient (B) Signup and view all the answers

How are the oxygen and nitrous oxide flow control knobs connected in modern anaesthetic machines?

Mechanically or pneumatically (D) Signup and view all the answers

What is the function of the mixture control wheel on the Quantiflex anaesthetic machine?

To adjust the relative concentrations of oxygen and nitrous oxide (B) Signup and view all the answers

Why is it essential to have clear visibility of the bobbin stops in anaesthetic machines?

To prevent the delivery of too high or too low gas supply to the patient (B) Signup and view all the answers

What is the typical range for adjusting the oxygen concentration on a Quantiflex anaesthetic machine?

30% - 100% (D) Signup and view all the answers

How does the design of the Quantiflex anaesthetic machine prevent the delivery of hypoxic mixtures?

By using a mixture control wheel for relative concentration adjustments (C) Signup and view all the answers

What is the purpose of installing a wire stop at the top of the flowmeter tube?

To prevent the bobbin from reaching the top of the tube (C) Signup and view all the answers

How do color coded and gas specific pressure gauges measure pressures in cylinders and pipelines?

By using the Bernoulli pressure gauge principle (B) Signup and view all the answers

What is the approximate pressure to which pressure regulators reduce gases from cylinders?

400 KPa (C) Signup and view all the answers

Why are flow constrictors used on pipeline gas supplies?

To prevent high pressures in the anaesthetic machine (D) Signup and view all the answers

Why is it important for oxygen and nitrous oxide flowmeters to be interlinked?

To prevent the delivery of hypoxic mixtures (B) Signup and view all the answers

What is the error margin of the flowmeter mentioned in the text?

+/- 2.5% (C) Signup and view all the answers

What is the main purpose of pressure gauges in an anaesthetic machine?

To measure the pressure in the cylinders and pipelines (C) Signup and view all the answers

Why should a pressure gauge designed for cylinder not be used to measure pipeline pressure?

It can lead to inaccuracies or damage to the pressure gauge (A) Signup and view all the answers

What is one of the differences between oxygen and nitrous oxide pressure gauges?

The pressure measured indicates the contents available in the cylinder for oxygen, but not for nitrous oxide (A) Signup and view all the answers

What happens if oxygen and nitrous oxide pressure gauges are wrongly connected?

It can lead to inaccuracies or damage to the pressure gauges (C) Signup and view all the answers

Why do some modern anaesthetic machines have a digital display of gas supply pressures?

For easier monitoring and reading of gas pressures in real-time (D) Signup and view all the answers

How are pressure gauges labeled in an anaesthetic machine?

Color coded and calibrated for a particular gas or vapor (A) Signup and view all the answers

Why are flow restrictors used on the pipeline supply instead of pressure regulators?

To significantly reduce the pressure while maintaining a constant flow rate (B) Signup and view all the answers

What is the purpose of flow control needle valves in an anesthetic machine?

To control the flow through the flowmeters by manual adjustment (A) Signup and view all the answers

How do flow restrictors function in an anesthetic machine?

By reducing the pressure significantly while maintaining a constant flow rate (C) Signup and view all the answers

What is the main difference between flow restrictors and pressure regulators in an anesthetic machine?

Pressure regulators adjust the pressure, while flow restrictors maintain a constant flow rate (A) Signup and view all the answers

Why are flow control knobs in an anesthetic machine color-coded and labeled?

To allow easier identification of gases and their flow rates (D) Signup and view all the answers

What is the purpose of the design differences in the oxygen control knob in an anesthetic machine?

To allow identification and recognition by touch (A) Signup and view all the answers