1. Which of the following three physiological parameters might be measured in an ICU or CCU along with ECG, heart rate, respiratory rate, and arterial pressure?
ICP, pH, acoustic impedance
EEG, venous pressure, cardiac output
EMG, uterine contractions, urine output
BUN, creatine, myoglobin
2. Silver and zinc electrodes are immersed in an electrolyte solution. Given that the half-cell potentials for zinc and silver are -0.763 V and +0.799 V, respectively, what is the potential drop between these two electrodes?
0.036 V
1.562 V
-1.562 V
-0.036 V
3. Which is the term used to describe the distensibility of the chest and/or lung expressed as the ratio of volume change to pressure change?
Viscosity
Elastance
Surface tension
Compliance
4. In error, a patient is infused with a large volume of a solution that causes lysis of his red blood cells. The solution was most likely
isotonic NaCL.
isotonic mannitol.
hypertonic mannitol.
hypotonic urea.
5. In respiratory therapy equipment, which device creates suspended fine particles or droplets in the administered gas?
A gas regulator
A flowmeter
A humidifier
A nebulizer
6. An acute decrease in arterial blood pressure elicits which of the following compensatory changes?
Decreased heart rate
Decreased contractility
Decreased mean systemic pressure
Decreased firing rate of the carotid sinus nerve
7. Two metal plates with an area of 4 cm2 and separation distance of 0.01 cm are used to form a capacitance transducer. If the material between the two plates has a dielectric constant of 2.5 and the dielectric constant of free space is 8.85 pF/m, calculate the capacitance of the transducer.
8.85 µF
0.885 F
8.85 nF
8.85 mF
8. For the purpose of an MRI, which element within the body is most important?
Oxygen
Hydrogen
Carbon
Calcium
9. An RTD transducer
is built from semiconducting materials.
has a relatively linear temperature-resistance graph.
is smaller than a thermistor in size.
cannot be used when accurate measurements are required.
10. A thermocouple measures temperature by converting thermal energy to electrical energy. If a thermocouple produces 25 mV and 750 µA, how much heat has been converted to energy?
3.0 µW
18.8 µW
30 mW
33 mW
11. In selecting a display for a portable medical instrument, power consumption is important. Which of the following display technologies has the least power consumption?
CRT
LED
TRP
LCD
12. Permanent storage of measurements in a medical device utilizes which type of memory?
DRAM
SRAM
Flash RAM
RDRAM
13. To avoid signal corruption, a data acquisition system should include which of the following?
A low-pass filter
A bandpass filter
A high-pass filter
A notched filter
14. Which of the following is the government agency concerned with the design and manufacturing of safe medical devices?
FDA
AAMI
JACHO
NFPA
15. Microshock is:
a low value of current (microamps), which passes arm to arm through the body by skin contact with a voltage source.
a low value of current (microamps), which passes directly through the heart via a needle or catheter in an artery or vein.
a high value of current (milliamps), which passes arm to arm through the body by skin contact with a voltage source.
a high value of current (milliamps), which passes directly through the heart via a needle or catheter in an artery or vein.
16. The National Electrical Code (NEC) Article 517.15 for Health Care Facilities specifies that the maximum potential between any two exposed conductive surfaces in the vicinity of a patient is ______ for normal device operation in general care areas.
40 mV
50 mV
400 mV
500 m