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

10 microamps

Answer

100 microamps

Answer

500 microamps

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

0.33 amps

Answer

1.5 amps

Answer

48 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

Amplify the signal voltage

Answer

Increase resistance to protect the load

Answer

Convert AC to DC current

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

Peak voltage only

Answer

Charge voltage in millivolts

Answer

Average current in milliamps

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

Frequency of AC signals

Answer

Amplitude of digital signals

Answer

Capacitance of isolation transformers

Question 6

An operational amplifier (op-amp) configured in inverting mode with a feedback resistor of 100 kΩ and an input resistor of 10 kΩ has a voltage gain of:

Accepted Answer

-10

Answer

+10

Answer

+0.1

Answer

-0.1

Question 7

A Ground Fault Circuit Interrupter (GFCI) protects personnel in the biomedical environment by tripping when it detects a ground fault current exceeding:

Accepted Answer

5 milliamps

Answer

1 milliamp

Answer

10 milliamps

Answer

50 milliamps