Question 1

Which of the following is an example of a flow control valve?&#10;A) Linear piston&#10;B) Spring-loaded bellows&#10;C) Solenoid&#10;D) Rotary drive piston

Accepted Answer

Flow-control valves include proportional solenoid valves and digital valves with on/off configurations.

Question 2

In the image,what does &#34;B&#34; represent?&#10; &#10;A) Expiratory valve line&#10;B) Exhalation valve&#10;C) Expiratory line&#10;D) Main inspiratory line

Accepted Answer

The external exhalation valve is represented by the letter "C" in the figure."B" is pointing to the expiratory line.The main inspiratory line is represented by the letter "A." The expiratory valve line is represented by "D."

Question 3

The type of compressor that is used by hospitals to supply wall compressed air has which of the following?&#10;A) Piston&#10;B) Bellows&#10;C) Rotating blades&#10;D) Moving diaphragm

Accepted Answer

Hospitals use large,piston-type,water-cooled compressors to supply wall gas outlets.

Question 4

The power transmission and conversion system of a ventilator is defined as which of the following?&#10;A) A mechanical device that produces gas flow to the patient.&#10;B) An electrical motor that is connected by a special gearing mechanism.&#10;C) The system that interprets the settings and produces or regulates the desired output.&#10;D) Internal hardware that changes electrical or pneumatic energy into mechanical energy.

Accepted Answer

The power transmission and conversion system changes the energy from the power source into mechanical energy.The linear drive piston is a mechanical device that produces gas flow to the patient.The drive mechanism is an electrical motor that is connected by a special gearing mechanism.It is the control system that interprets the operator settings and produces or regulates the desired output.

Question 5

A ventilator for which the primary power source generates a gas flow that compresses another mechanism and causes the gas from inside the mechanism to be delivered to the patient is known as which of the following?

A) Single-circuit
B) Double-circuit
C) Closed loop
D) Open loop

Accepted Answer

In a double-circuit ventilator,the primary power source generates a gas flow that compresses a mechanism such as a bellows or "bag-in-a-chamber." The gas in the bellows or bag then flows to the patient.In a single-circuit ventilator,the primary power source travels directly to the patient.The closed and open loop refer to whether or not the ventilator has a feedback loop system.

Question 6

The respiratory therapist enters modes and parameters into the ventilator with which of the following?&#10;A) Control logic&#10;B) Input power&#10;C) User interface&#10;D) Drive mechanism

Accepted Answer

The user interface or control panel contains certain knobs,dials,or keypads where the ventilator operator sets or enters certain information to establish how the pressure and pattern of gas flow are delivered by the machine.Inside the ventilator is the control logic or control system that interprets the operator settings and produces and regulates the desired output.The input power is the ventilator's power source that provides the energy to enable the ventilator to perform the work of ventilating the patient.The drive mechanism is a mechanical device that produces gas flow to the patient.

Question 7

The function of the exhalation valve is to do which of the following?&#10;A) Adjust the flow going to the patient.&#10;B) Close during exhalation to vent patient gas.&#10;C) Seal the external circuit during inspiration.&#10;D) Determine the volume being delivered.

Accepted Answer

During inspiration,gas fills the balloon and closes a hole in the expiratory valve.Closing of the hole makes the patient circuit a sealed system.During expiration,the balloon deflates,the hole opens,and gas from the patient is exhaled into the room through the hole.

Question 8

A series of tubes that allow gas to flow inside the ventilator and between the ventilator and the patient is referred to as the:&#10;A) pneumatic circuit.&#10;B) control circuit.&#10;C) control scheme.&#10;D) patient circuit.

Accepted Answer

A pneumatic circuit,or pathway,is a series of tubes that allow gas to flow inside the ventilator and between the ventilator and the patient.

Question 9

In a spring-loaded bellows volume-delivery device,the amount of pressure is determined by the:&#10;A) location of the bellows.&#10;B) volume setting on the ventilator.&#10;C) tightness of the spring.&#10;D) electrical power provided to the spring.

Accepted Answer

In a spring-loaded bellows model,an adjustable spring atop a bellows applies a force per unit area,or pressure (P = Force/area).Tightening of the spring creates greater force and therefore greater pressure.The bellows contains pre-blended gas (air and oxygen),which is administered to the patient.

Question 10

A patient being transferred from a hospital to a skilled nursing facility requires mechanical ventilation with a fractional inspired oxygen (FɪO₂)of 0.21.The skilled nursing facility has no piped in gases.Which of the following ventilators will be able to function in the skilled nursing facility without any extra equipment?

A) Servoi
B) LTV 1000
C) Bird Mark 7
D) Bio-Med MVP-10

Accepted Answer

The type of ventilator that will be appropriate for this situation is one that is electrically controlled and powered with a built-in air compressor.The LTV 1000 fits this description.The Servoᶦ requires both a high-pressure gas source and electrical power.The Bird Mark 7 is a pneumatic ventilator and will not be able to function in this situation.The Bio-Med MVP-10 is also a pneumatic ventilator that won't function in this situation.

Question 11

Modern intensive care units' (ICU)ventilators regulate gas flow to the patient by using which of the following?&#10;A) Rotary drive pistons&#10;B) Linear drive pistons&#10;C) Proportional solenoids&#10;D) Spring-loaded bellows

Accepted Answer

The answer of Modern intensive care units' (ICU)ventilators regulate gas...

Question 12

The internal circuit of a ventilator allows the gas to go directly from its power source into the patient.This is known as which of the following?&#10;A) Single-circuit&#10;B) Open loop&#10;C) Closed loop&#10;D) Double-circuit

Accepted Answer

The answer of The internal circuit of a ventilator allows...

Question 13

The volume displacement device that creates a sinusoidal flow waveform is which of the following?&#10;A) Rotary drive piston&#10;B) Linear drive piston&#10;C) Spring-loaded bellows&#10;D) Proportional solenoid

Accepted Answer

The answer of The volume displacement device that creates a...

Deck 2: How Ventilators Work