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

Maintain balanced phase voltages on the distribution panel

Answer

Regulate current to connected medical devices

Answer

Measure total harmonic distortion on the isolated bus

Question 2

Which sterilization method uses ethylene oxide (EtO) gas?

Accepted Answer

Low-temperature chemical gas sterilization

Answer

Autoclave steam sterilization

Answer

Dry heat sterilization

Answer

UV radiation sterilization

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

The maximum input voltage the ADC can process

Answer

The sampling rate in samples per second

Answer

The time required to complete one conversion cycle

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

500 Hz

Answer

1,000 Hz

Answer

4,000 Hz

Question 5

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

Accepted Answer

Flash (EEPROM)

Answer

SRAM (Static RAM)

Answer

DRAM (Dynamic RAM)

Answer

Cache memory

Question 6

What is the primary safety risk of macroshock in a medical setting?

Accepted Answer

Ventricular fibrillation from current passing through the chest

Answer

Tissue burns at the point of electrode contact only

Answer

Auditory damage from electromagnetic interference

Answer

Disruption of pacemaker telemetry signals

Question 7

In ultrasound imaging, what physical property of tissue determines the acoustic impedance?

Accepted Answer

Density and speed of sound in the tissue

Answer

Temperature and viscosity

Answer

Elasticity and attenuation coefficient only

Answer

Water content and electrical conductivity