BTC Biomedical Instrumentation & Electrical Fundamentals 3

Question 1

When using an oscilloscope to measure a sinusoidal AC signal, a technician observes a peak-to-peak voltage of 28.28 V. What is the RMS voltage of this signal?

Accepted Answer

10 V

Answer

For a sine wave, V_RMS = V_peak / √2; the peak voltage is half the peak-to-peak (14.14 V), so V_RMS = 14.14 / 1.414 ≈ 10 V.

Question 2

In a hospital electrical system, power factor correction is important because a low power factor causes:

Accepted Answer

Increased current draw and wiring losses for the same useful power delivered

Answer

A low power factor means the apparent power (VA) exceeds real power (W), requiring higher current to deliver the same useful work, which increases I²R losses in wiring and transformer heating.

Question 3

A hospital-grade Uninterruptible Power Supply (UPS) for life-critical equipment should provide automatic transfer to battery backup within a maximum of:

Accepted Answer

10 milliseconds

Answer

Life-critical medical UPS systems must transfer to battery within 10 milliseconds (per NFPA 99 and IEC standards) to prevent any clinically significant interruption to patient care equipment.

Question 4

The frequency response specification of a physiological amplifier describes:

Accepted Answer

The range of frequencies over which the amplifier maintains acceptable gain

Answer

Frequency response specifies the bandwidth over which an amplifier's gain remains within defined limits (typically ±3 dB), ensuring accurate reproduction of the full physiological signal.

Question 5

In digital biomedical circuitry, which logic gate produces a HIGH output only when ALL inputs are HIGH?

Accepted Answer

AND gate

Answer

An AND gate outputs HIGH (logic 1) only when every input is simultaneously HIGH; any LOW input forces the output LOW.

(BTC) Biomedical Technician Certification Practice Test

(BTC) Biomedical Technician Certification Practice Test

BTC Biomedical Instrumentation & Electrical Fundamentals 3