CBET Basic 5

Question 1

What is the purpose of the line isolation monitor (LIM) in an isolated power system?

Accepted Answer

Detect and alarm when the impedance to ground falls below a safe threshold

Answer

The LIM continuously monitors the impedance between the isolated power conductors and ground, alarming when a fault path to ground is detected before a hazard occurs.

Question 2

Which sterilization method uses ethylene oxide (EtO) gas?

Accepted Answer

Low-temperature chemical gas sterilization

Answer

Ethylene oxide (EtO) is a low-temperature gas sterilization method suitable for heat-sensitive or moisture-sensitive medical devices.

Question 3

What does the term 'resolution' mean in the context of an analog-to-digital converter (ADC)?

Accepted Answer

The number of discrete output values the ADC can represent, determined by its bit depth

Answer

ADC resolution is defined by the number of bits: an n-bit ADC can represent 2ⁿ discrete values, determining the smallest detectable signal change.

Question 4

According to the Nyquist theorem, what minimum sampling rate is required to faithfully reconstruct a 1,000 Hz signal?

Accepted Answer

2,000 Hz

Answer

The Nyquist theorem requires a sampling rate of at least twice the highest frequency component, so a 1,000 Hz signal requires at least 2,000 samples per second.

Question 5

Which type of memory retains its contents without power in embedded biomedical systems?

Accepted Answer

Flash (EEPROM)

Answer

Flash memory and EEPROM are non-volatile, retaining stored data when power is removed, making them suitable for firmware and calibration data storage.

CBET - Certified Biomedical Equipment Technician Practice Test

CBET - Certified Biomedical Equipment Technician Practice Test

CBET Basic 5