CABT Fundamentals of Electronics 4

Question 1

What is the purpose of electrical isolation in patient-connected biomedical equipment?

Accepted Answer

To prevent leakage current from passing through the patient

Answer

To increase signal gain

Answer

To reduce power consumption

Answer

To improve signal bandwidth

Question 2

The term 'slew rate' in an operational amplifier refers to:

Accepted Answer

Maximum rate of change of output voltage

Answer

Maximum output voltage swing

Answer

Gain-bandwidth product

Answer

Input offset voltage drift

Question 3

Which semiconductor device is most suitable for controlling large currents in medical power supplies using a low-power control signal?

Accepted Answer

MOSFET

Answer

Junction diode

Answer

Bipolar junction transistor

Answer

Zener diode

Question 4

In an EEG amplifier, why is a notch filter at 60 Hz commonly used?

Accepted Answer

To eliminate power line interference from the signal

Answer

To amplify brain wave frequencies

Answer

To increase signal-to-noise ratio across all frequencies

Answer

To prevent electrode polarization

Question 5

What does the term 'ground loop' refer to in biomedical electronics?

Accepted Answer

Unwanted current flow through multiple ground paths causing interference

Answer

A safety ground connection

Answer

The return path for patient leakage current

Answer

A feedback loop in a ground-referenced amplifier

Question 6

An oscilloscope reading shows a sinusoidal wave with peak voltage of 10V. What is its RMS voltage?

Accepted Answer

7.07 V

Answer

10 V

Answer

14.14 V

Answer

5 V

Question 7

In digital-to-analog conversion, the term 'settling time' refers to:

Accepted Answer

Time for the DAC output to reach and stay within a specified accuracy band after a code change

Answer

Time for the ADC to complete one conversion

Answer

Time constant of the output filter

Answer

Propagation delay through digital logic