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

14.14 V

Answer

20 V

Answer

28.28 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

Higher frequency output from generators

Answer

Faster discharge of backup battery systems

Answer

Reduced ground fault sensitivity in GFCI outlets

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

10 seconds

Answer

30 seconds

Answer

2 minutes

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

The maximum voltage the amplifier can safely handle

Answer

The DC offset correction speed of the amplifier

Answer

The power consumption of the amplifier at full output

Question 5

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

Accepted Answer

AND gate

Answer

OR gate

Answer

NAND gate

Answer

XOR gate

Question 6

A biomedical technician uses a voltage divider with a 10 kΩ and a 40 kΩ resistor connected in series across a 5 V supply. What voltage appears across the 40 kΩ resistor?

Accepted Answer

4 V

Answer

1 V

Answer

2 V

Answer

3 V

Question 7

The clinical ECG signal contains diagnostic frequency content primarily in the range of:

Accepted Answer

0.05–150 Hz

Answer

0.001–0.05 Hz

Answer

150–500 Hz

Answer

500–1000 Hz