CBET Sterilization and Infection Control Equipment 5

Question 1

A gravity displacement autoclave is unable to sterilize items with long narrow lumens because:

Accepted Answer

Air cannot be fully displaced from enclosed spaces by gravity alone

Answer

The temperature exceeds safe limits for lumened devices

Answer

Steam pressure is insufficient for penetration

Answer

Cycle time is too short for hollow instruments

Question 2

What does the D-value represent in sterilization science?

Accepted Answer

The time or dose needed to reduce the microbial population by 90%

Answer

The minimum dose required to kill all microorganisms

Answer

The depth of penetration of the sterilant

Answer

The detection threshold of biological indicators

Question 3

Which class of chemical indicators provides the most information about sterilization cycle conditions?

Accepted Answer

Class 6 (emulating indicators)

Answer

Class 1 (process indicators)

Answer

Class 3 (single-variable indicators)

Answer

Class 5 (integrating indicators)

Question 4

During vaporized hydrogen peroxide (VHP) sterilization, which condition causes cycle failure?

Accepted Answer

Residual moisture in the chamber or on devices

Answer

Excessive load mass

Answer

Low ambient room temperature

Answer

Use of metallic instrument trays

Question 5

A HEPA filter used in a biological safety cabinet must retain what minimum percentage of particles at 0.3 microns?

Accepted Answer

99.97%

Answer

95%

Answer

97%

Answer

99.999%

Question 6

Which sterilization method is most appropriate for heat-sensitive fiber optic endoscopes that cannot be immersed?

Accepted Answer

Ethylene oxide gas sterilization

Answer

Flash steam sterilization

Answer

Gamma radiation

Answer

Dry heat sterilization

Question 7

The sterility assurance level (SAL) required for critical medical devices classified by the Spaulding system is:

Accepted Answer

10⁻⁶

Answer

10⁻³

Answer

10⁻⁴

Answer

10⁻⁸