BTC Biomedical Instrumentation & Electrical Fundamentals

Question 1

According to AAMI ES1 standards, what is the maximum allowable leakage current for chassis ground of patient-connected (Type CF) equipment?

Accepted Answer

50 microamps

Answer

AAMI ES1 specifies a maximum chassis leakage current of 50 microamps for Type CF (cardiac-floating) patient-connected equipment under normal conditions.

Question 2

A biomedical technician measures 12 volts across a 4-ohm resistor. According to Ohm's Law, what current is flowing through the resistor?

Accepted Answer

3 amps

Answer

Ohm's Law states I = V/R; dividing 12 volts by 4 ohms yields 3 amps.

Question 3

In a biomedical circuit, a capacitor is used in parallel with a load. What is the primary function of the capacitor in this configuration?

Accepted Answer

Filter high-frequency noise from the power supply

Answer

A capacitor placed in parallel across a load acts as a bypass or decoupling capacitor, filtering high-frequency noise and smoothing voltage ripple.

Question 4

When testing a defibrillator, which measurement is used to verify the energy delivered to the patient?

Accepted Answer

Delivered energy in joules

Answer

Delivered energy in joules is the standard measurement for verifying defibrillator output because it represents the actual therapeutic energy transferred to the patient.

Question 5

A Wheatstone bridge circuit is commonly used in biomedical instrumentation to measure what type of parameter?

Accepted Answer

Small changes in resistance from transducers

Answer

The Wheatstone bridge is designed to detect small changes in resistance, making it ideal for use with strain gauges, thermistors, and other resistive transducers in biomedical devices.

(BTC) Biomedical Technician Certification Practice Test

(BTC) Biomedical Technician Certification Practice Test

BTC Biomedical Instrumentation & Electrical Fundamentals