“200”, Aptitude Test
Questions and Answers for Mhandisi Vifaa Tiba Daraja la II, (Biomedical
Engineer) at – MDA and LGA.
ABSTRACT
This
compilation presents 200 multiple-choice questions and answers for candidates
preparing for the Biomedical Engineer II (Mhandisi Vifaa Tiba Daraja la II)
aptitude test under Tanzania’s Public Service Recruitment Secretariat (PSRS)
for MDA and LGA institutions. The questions are scenario-based and designed to
assess analytical thinking, technical knowledge, problem-solving ability, and
professional judgment rather than simple memorization. The content covers
preventive and corrective maintenance, medical equipment troubleshooting,
calibration, electrical safety, procurement, asset and maintenance management,
quality assurance, risk management, biomedical ethics, and healthcare engineering
practices. Each question includes the correct answer and a concise rationale to
reinforce understanding, making this resource an effective tool for examination
preparation and professional competency development.
Prepared by: Biomedical Engineer
Professionals stationed in Dar-es-salaam.
0628729934.
Date: July 24, 2026
Dear applicants,
This collection of questions and answers
has been prepared to help all of you to understand the key areas tested during
the interview. The goal is to provide a useful, and practical study guide so you
can all perform confidently and fairly in the selection process. I wish you the
best of luck, and may this resource support you in achieving success!
Warm regards,
Johnson Yesaya Mgelwa
For
Personal Use by Applicants Preparing for Fani ya Uhandisi Vifaa Tiba
(Biomedical Engineering) at – MDA and LGA.
ALL
QUESTIONS ARE COMPILED TOGETHER.
Question 1
A district hospital reports that an
infusion pump occasionally stops delivering medication during prolonged use,
yet resumes normal operation after being switched off and restarted. No visible
damage is observed. What should the Biomedical Engineer II do FIRST before
replacing any component?
A. Replace the internal control board
immediately. B. Perform systematic functional testing while reviewing
maintenance history. C. Order a completely new infusion pump. D. Remove the
equipment permanently from hospital service.
Answer: B. Perform systematic functional
testing while reviewing maintenance history.
Rationale: Biomedical engineering practice
emphasizes evidence-based troubleshooting before replacing components.
Intermittent faults often arise from overheating, loose electrical connections,
worn sensors, software issues, or power instability rather than failed control
boards. Reviewing maintenance records together with functional testing helps
determine whether the problem is repeatable, identifies previous similar
failures, and prevents unnecessary expenditure on spare parts. Immediate
replacement of expensive components without diagnosis contradicts sound
maintenance principles and efficient resource utilization expected in Tanzanian
public health facilities.
Question 2
During preventive maintenance of a
patient monitor, all measured parameters fall within acceptable limits except
the non-invasive blood pressure module, which consistently gives readings
significantly higher than a calibrated reference device. Which action is MOST
appropriate?
A. Continue using the monitor because
only one parameter is affected. B. Advise clinicians to estimate blood pressure
manually whenever possible. C. Remove the monitor from clinical use until the
faulty module is corrected. D. Record the discrepancy but postpone repairs
until the annual service.
Answer: C. Remove the monitor from
clinical use until the faulty module is corrected.
Rationale: Patient safety takes precedence over
equipment availability. An inaccurate blood pressure module can lead to
inappropriate diagnosis or treatment decisions, potentially causing patient
harm. Biomedical engineers are responsible for ensuring that every monitored
parameter performs within acceptable accuracy limits before equipment is
returned to service. Continuing to use known inaccurate equipment, relying
solely on manual estimates, or delaying repairs exposes patients and healthcare
providers to unnecessary clinical risks.
Question 3
A biomedical engineer receives three
urgent maintenance requests simultaneously: a faulty theatre suction machine, a
malfunctioning laboratory centrifuge, and an outpatient weighing scale with
unstable readings. Which should receive the HIGHEST priority?
A. Outpatient weighing scale. B.
Laboratory centrifuge. C. Theatre suction machine. D. Attend all requests in
the order received.
Answer: C. Theatre suction machine.
Rationale: Maintenance prioritization should always
consider the potential impact on patient survival and emergency care. A suction
machine used in an operating theatre directly supports airway management and
removal of blood or secretions during surgery. Failure of this equipment may
immediately threaten patient life, whereas laboratory testing delays and
weighing inaccuracies generally present lower immediate clinical risk.
Biomedical engineers must therefore prioritize critical life-support and
emergency equipment before lower-risk devices.
Question 4
While inspecting an autoclave, the
pressure gauge appears normal, but biological indicator testing repeatedly
suggests incomplete sterilization. Which conclusion is MOST appropriate?
A. The pressure gauge alone confirms
effective sterilization. B. Sterilization failure should be ignored because
temperature is acceptable. C. Replace all surgical instruments immediately. D.
Investigate the sterilization process rather than relying on gauge readings
alone.
Answer: D. Investigate the sterilization
process rather than relying on gauge readings alone.
Rationale: Sterilization effectiveness depends on
the correct combination of temperature, pressure, exposure time, steam
penetration, and equipment performance. Biological indicators provide direct
evidence of microbial destruction and therefore carry greater significance than
pressure readings alone. A normal gauge cannot guarantee effective
sterilization if steam quality, exposure time, or chamber performance is
compromised. Biomedical engineers must investigate the entire sterilization
cycle before declaring equipment safe for continued use.
Question 5
A replacement spare part for a
defibrillator is unavailable locally, but another component with similar
physical dimensions appears compatible. What is the BEST decision?
A. Install the similar component after
visual inspection only. B. Modify the existing circuit to accommodate the new
component. C. Use the substitute temporarily without documentation. D. Obtain
an approved compatible spare part before installation.
Answer: D. Obtain an approved compatible
spare part before installation.
Rationale: Medical equipment should only be
repaired using manufacturer-approved or technically verified compatible
components. Physical similarity does not guarantee electrical compatibility,
performance, safety, or compliance with equipment specifications. Unauthorized
substitutions may alter energy delivery, reduce reliability, invalidate
maintenance records, and expose patients to serious hazards. Biomedical
engineers have a professional duty to preserve equipment integrity through
approved repair practices.
Question 6
Following repair of an ECG machine, what
provides the STRONGEST evidence that the equipment is ready for clinical use?
A. The machine powers on successfully. B.
The display screen appears brighter than before. C. Clinical staff express
confidence in the repair. D. Functional verification confirms accurate ECG
signal performance.
Answer: D. Functional verification
confirms accurate ECG signal performance.
Rationale: Successful repair is demonstrated
through objective functional verification rather than cosmetic appearance or
user opinion. Biomedical engineers must confirm that the equipment performs
according to manufacturer specifications under expected operating conditions. A
device may power on yet still produce inaccurate measurements or hidden faults.
Functional testing ensures patient safety, measurement accuracy, and
reliability before returning equipment to service.
Question 7
A voltage stabilizer supplying several
laboratory analyzers frequently activates its protection mechanism despite
normal mains voltage measurements. What should be investigated FIRST?
A. Internal electrical loading and
connected equipment demand. B. Replace every analyzer immediately. C.
Disconnect the stabilizer permanently. D. Ignore the condition unless complete
failure occurs.
Answer: A. Internal electrical loading
and connected equipment demand.
Rationale: Protective devices commonly activate
because of overload conditions, intermittent faults, or excessive current
demand rather than external voltage problems alone. Evaluating connected loads
helps determine whether equipment collectively exceeds stabilizer capacity or
whether one device has developed an electrical fault. Biomedical engineers
should investigate system loading systematically before replacing equipment or
disabling protective devices that are designed to prevent electrical damage.
Question 8
A maintenance log repeatedly shows
replacement of the same ventilator alarm sensor every few months. Which
conclusion is MOST reasonable?
A. The sensor manufacturer is always
responsible. B. The maintenance records suggest an unresolved underlying cause
requiring investigation. C. Alarm sensors naturally require replacement every
few months. D. Future maintenance records are unnecessary.
Answer: B. The maintenance records
suggest an unresolved underlying cause requiring investigation.
Rationale: Recurrent replacement of the same
component indicates that maintenance activities are addressing symptoms rather
than identifying the root cause. Possible contributors include electrical
faults, environmental conditions, improper installation, software issues, or
operator practices. Maintenance records are valuable tools for recognizing
patterns that support root-cause analysis, reduce recurring failures, and
improve long-term equipment reliability.
Question 9
Before preparing the annual maintenance
budget for district medical equipment, which information is MOST valuable?
A. Previous maintenance history together
with projected service requirements. B. Estimated patient attendance alone. C.
Building maintenance expenditure only. D. Number of hospital employees only.
Answer: A. Previous maintenance history
together with projected service requirements.
Rationale: Effective budgeting depends upon
objective evidence regarding equipment condition, historical maintenance costs,
expected preventive maintenance schedules, anticipated spare parts, calibration
needs, and equipment age. Patient attendance and staffing levels may influence
workload but cannot accurately predict technical maintenance costs. Biomedical
engineers should therefore base maintenance budgets primarily on equipment
performance data and anticipated service requirements.
Question 10
During inspection of an electrosurgical
unit, leakage current exceeds acceptable limits although the equipment
functions normally. What should the engineer conclude?
A. Clinical performance is satisfactory
despite leakage. B. Leakage current is unimportant during surgery. C. The
equipment should be withdrawn until the electrical safety defect is corrected. D.
Surgeons should simply avoid prolonged procedures.
Answer: C. The equipment should be
withdrawn until the electrical safety defect is corrected.
Rationale: Electrical safety testing is as
important as functional performance because excessive leakage current exposes
patients and healthcare workers to electrical shock, particularly during
invasive procedures. An electrosurgical unit may appear clinically functional
while still presenting serious hidden hazards. Biomedical engineers are
responsible for ensuring compliance with electrical safety requirements before
equipment is released for patient use.
Question 11
A district hospital experiences frequent
failure of an anesthesia machine due to unstable electricity. Besides repairing
the machine, which engineering intervention would MOST effectively reduce
future failures?
A. Increase the frequency of operator
training only. B. Replace the breathing circuit after every procedure. C.
Install an appropriate power conditioning system for the equipment. D. Reduce
the daily operating hours of the anesthesia machine.
Answer: C. Install an appropriate power
conditioning system for the equipment.
Rationale: Biomedical engineers are expected not
only to repair equipment but also to identify and eliminate the root causes of
recurring failures. Unstable electrical supply can damage sensitive electronic
components, shorten equipment lifespan, and interrupt critical surgical
services. Installing suitable power conditioning devices, such as voltage
stabilizers or uninterruptible power supplies where appropriate, protects
equipment from voltage fluctuations and significantly improves reliability.
Merely repairing the equipment without addressing the power problem will likely
result in repeated failures and unnecessary maintenance costs.
Question 12
Following replacement of an oxygen sensor
in a ventilator, what should the Biomedical Engineer II perform BEFORE
returning the ventilator to clinical use?
A. Verify oxygen concentration accuracy
using appropriate performance testing. B. Ask clinicians whether they are
satisfied with the repair. C. Wait until the ventilator is used on the next
patient. D. Replace the battery regardless of its condition.
Answer: A. Verify oxygen concentration
accuracy using appropriate performance testing.
Rationale: Replacing a component does not guarantee
proper equipment performance. The oxygen sensor directly influences the
ventilator's ability to deliver accurate oxygen concentrations, making
verification essential before patient use. Functional performance testing
confirms that the repair restored the equipment to manufacturer specifications
and that no calibration or installation errors remain. Returning life-support
equipment to service without verification could expose critically ill patients
to dangerously inaccurate oxygen delivery.
Question 13
A laboratory incubator consistently
maintains the correct temperature but requires significantly longer than
expected to reach the set point. What is the MOST appropriate interpretation?
A. The incubator is operating perfectly
because the final temperature is correct. B. Delayed heating may indicate
developing faults requiring investigation. C. Temperature stabilization time
has no maintenance significance. D. The thermometer being used for testing is
automatically defective.
Answer: B. Delayed heating may indicate
developing faults requiring investigation.
Rationale: Preventive maintenance involves
identifying early signs of deterioration before complete equipment failure
occurs. Excessive heating time may result from aging heating elements, poor
insulation, failing temperature controllers, reduced electrical efficiency, or
internal component degradation. Although the incubator eventually reaches the
desired temperature, declining performance may affect laboratory workflow and
signal impending failure. Biomedical engineers should investigate abnormal
trends early to prevent costly breakdowns.
Question 14
While inspecting a patient monitor, the
engineer notices that the equipment has repeatedly missed scheduled preventive
maintenance over the past two years. What is the GREATEST concern?
A. The monitor automatically becomes
obsolete. B. Preventive maintenance records are only administrative documents. C.
Cosmetic appearance of the equipment will deteriorate. D. Undetected faults may
compromise equipment reliability and patient safety.
Answer: D. Undetected faults may
compromise equipment reliability and patient safety.
Rationale: Preventive maintenance is designed to
identify hidden defects before they affect clinical performance. Missing
scheduled maintenance increases the likelihood that calibration errors, worn
components, electrical safety issues, or deteriorating sensors remain
undetected until failure occurs during patient care. Biomedical engineers must
recognize preventive maintenance as a proactive patient safety strategy rather
than merely an administrative requirement. Reliable documentation also
demonstrates compliance with accepted engineering practices.
Question 15
A clinician requests immediate repair of
a portable suction machine that has been reported to produce unusual mechanical
noise during operation. What should the engineer do FIRST?
A. Increase the suction pressure setting. B.
Lubricate all moving parts without inspection. C. Investigate the source of the
abnormal noise before operating the equipment further. D. Continue using the
equipment until complete mechanical failure occurs.
Answer: C. Investigate the source of the
abnormal noise before operating the equipment further.
Rationale: Unusual mechanical noise often indicates
developing faults such as worn bearings, loose components, motor deterioration,
or pump damage. Continuing operation without investigation may worsen the
defect, increase repair costs, and result in sudden failure during patient
care. Biomedical engineers should always identify the source of abnormal
operating conditions before attempting corrective action, ensuring repairs
address the actual problem rather than its symptoms.
Question 16
Which maintenance record provides the
MOST useful information when evaluating whether replacement of an aging medical
device is more economical than continued repairs?
A. Daily patient attendance records. B.
Historical maintenance costs and equipment failure trends. C. Number of
clinical departments using the equipment. D. The equipment's original purchase
color.
Answer: B. Historical maintenance costs
and equipment failure trends.
Rationale: Decisions regarding equipment
replacement should be based on objective evidence rather than assumptions.
Maintenance history reveals repair frequency, cumulative repair costs,
downtime, availability of spare parts, and equipment reliability over time. When
maintenance expenses continue increasing while equipment reliability declines,
replacement may become more cost-effective than repeated repairs. Biomedical
engineers contribute valuable technical information to support such asset
management decisions.
Question 17
A replacement circuit board arrives
without manufacturer identification or traceable documentation. What should the
Biomedical Engineer II do?
A. Install it if the connectors fit
correctly. B. Reject or verify the component before installation. C. Modify the
equipment so the board functions properly. D. Install the board only during
emergency situations.
Answer: B. Reject or verify the component
before installation.
Rationale: Traceability is a fundamental principle
in medical equipment maintenance. Components lacking proper identification
cannot be verified for compatibility, quality, or compliance with manufacturer
specifications. Installing unverified parts may compromise equipment safety,
invalidate maintenance records, and expose patients to avoidable risks.
Biomedical engineers should ensure that replacement components are properly
documented and technically approved before installation.
Question 18
After completing preventive maintenance
on a neonatal radiant warmer, which outcome BEST demonstrates maintenance
effectiveness?
A. The warmer appears cleaner than before
servicing. B. Nursing staff report that it looks newer. C. Functional and
safety tests confirm performance within required specifications. D. The
maintenance activity required fewer spare parts than expected.
Answer: C. Functional and safety tests
confirm performance within required specifications.
Rationale: The objective of preventive maintenance
is to ensure that equipment performs safely and accurately according to
manufacturer requirements. Cosmetic improvements or reduced spare-part usage do
not demonstrate clinical readiness. Functional verification combined with
electrical safety testing provides objective evidence that the radiant warmer
can safely maintain neonatal body temperature without introducing hazards. This
verification is essential before returning the equipment to patient care.
Question 19
An equipment inventory shows several
identical syringe pumps distributed across different hospital departments. One
department repeatedly reports failures while the others experience normal
performance. Which explanation should be investigated FIRST?
A. Department-specific operating
conditions or user practices. B. Manufacturing defects affecting every syringe
pump equally. C. Hospital procurement procedures only. D. Random equipment
failure requiring no further analysis.
Answer: A. Department-specific operating
conditions or user practices.
Rationale: When identical equipment performs
differently under different conditions, biomedical engineers should investigate
environmental factors, operating practices, cleaning procedures, power quality,
workload, or handling within the affected department. Such comparative analysis
helps distinguish equipment defects from local operational influences. Assuming
manufacturer defects or random failures without evidence may overlook
correctable causes and lead to unnecessary replacement costs.
Question 20
During inspection of a medical device,
the engineer discovers that previous repairs were performed but no maintenance
documentation exists. What is the MOST significant implication?
A. Documentation is unnecessary if
equipment appears functional. B. Previous repairs can be assumed to have
followed correct procedures. C. New maintenance records should begin only after
equipment replacement. D. Missing records reduce traceability and complicate
future maintenance decisions.
Answer: D. Missing records reduce
traceability and complicate future maintenance decisions.
Rationale: Maintenance documentation is an
essential engineering tool that supports equipment history, troubleshooting,
preventive maintenance planning, regulatory compliance, warranty
considerations, and replacement decisions. Without reliable records, engineers cannot
determine previous faults, replaced components, recurring problems, or
maintenance intervals, making future diagnosis less efficient and potentially
increasing equipment downtime. Accurate documentation is therefore a
professional responsibility and an important component of quality biomedical
engineering practice.
Question 21
A district hospital receives complaints
that a chemistry analyzer occasionally reports inconsistent test results
despite passing its daily internal self-check. Which action should the
Biomedical Engineer II take FIRST?
A. Replace the analyzer immediately
because inconsistent results indicate permanent failure. B. Investigate
calibration status and verify performance using appropriate quality control
procedures. C. Increase the analyzer's operating speed to stabilize
measurements. D. Advise laboratory staff to average multiple patient results.
Answer: B. Investigate calibration status
and verify performance using appropriate quality control procedures.
Rationale: Internal self-checks primarily assess
the analyzer's electronic functions and may not detect calibration drift or
measurement inaccuracies. Biomedical engineers should first verify calibration,
quality control performance, and instrument accuracy before replacing expensive
components or altering operational settings. Reliable laboratory results are
essential for clinical decision-making, making calibration verification the
most appropriate first response to inconsistent analytical performance.
Question 22
During inspection of a hospital's medical
gas pipeline, the engineer notices that oxygen outlet pressure is consistently
below the recommended operating range in one ward while other wards function
normally. What is the MOST likely priority?
A. Replace every oxygen outlet in the
hospital. B. Increase oxygen cylinder pressure beyond recommended limits. C.
Investigate the affected pipeline section for localized restrictions or
leakage. D. Assume clinicians are using excessive oxygen flow.
Answer: C. Investigate the affected
pipeline section for localized restrictions or leakage.
Rationale: Since the problem affects only one
section of the hospital, the evidence suggests a localized fault rather than a
hospital-wide supply problem. Biomedical engineers should inspect for pipeline
leakage, pressure regulator malfunction, partially closed valves, or
obstruction within the affected distribution line. Systematic troubleshooting
minimizes unnecessary replacement of functioning components while restoring
safe oxygen delivery to patients.
Question 23
Following replacement of the battery in a
defibrillator, which additional step is ESSENTIAL before returning the
equipment to emergency service?
A. Confirm the equipment delivers the
selected energy accurately during performance testing. B. Clean the external
housing using disinfectant only. C. Recharge the battery for exactly one hour
regardless of manufacturer guidance. D. Store the defibrillator unused for one
month before testing.
Answer: A. Confirm the equipment delivers
the selected energy accurately during performance testing.
Rationale: Defibrillators are life-saving devices
whose performance must be verified after maintenance. Battery replacement alone
does not confirm that the charging, discharge, or energy delivery systems
function correctly. Biomedical engineers should perform energy output
verification using appropriate test equipment to ensure the selected
defibrillation energy matches actual delivered energy before the device is
returned to clinical use.
Question 24
A hospital acquires several new medical
devices, but none are assigned asset identification numbers before being
distributed to departments. What is the GREATEST long-term consequence?
A. Equipment will consume more electrical
power. B. Clinical users may require additional training. C. Devices may appear
newer than expected. D. Maintenance planning, tracking, and inventory control
become significantly more difficult.
Answer: D. Maintenance planning,
tracking, and inventory control become significantly more difficult.
Rationale: Asset identification enables biomedical
engineers to maintain complete equipment histories, schedule preventive
maintenance, monitor repair costs, locate devices efficiently, and support
budgeting and replacement planning. Without unique identification numbers,
maintenance records become unreliable, equipment may be overlooked during
scheduled servicing, and inventory management becomes inefficient. Proper asset
management is therefore a fundamental engineering responsibility.
Question 25
While preparing specifications for
procurement of replacement patient monitors, which consideration is MOST
important for ensuring long-term maintainability within a district hospital?
A. Selecting the equipment with the
brightest display screen. B. Choosing the monitor with the greatest number of
optional accessories. C. Ensuring availability of technical support, spare
parts, and maintenance documentation. D. Purchasing equipment solely because
another hospital uses the same model.
Answer: C. Ensuring availability of
technical support, spare parts, and maintenance documentation.
Rationale: Biomedical engineers play an important
role in procurement by evaluating not only equipment performance but also
long-term serviceability. Even technically advanced equipment becomes a burden
if spare parts, service manuals, calibration procedures, and qualified
technical support are unavailable. Selecting maintainable equipment reduces
downtime, supports preventive maintenance, controls lifecycle costs, and
ensures sustainable healthcare service delivery within Tanzanian public health
facilities.
Question 26
Following installation of a new patient
monitor supplied to a district hospital, which activity should be completed
BEFORE the equipment is officially handed over for clinical use?
A. Acceptance testing to verify
compliance with technical specifications and safe operation. B. Wait until
clinicians identify any defects during routine patient care. C. Begin
preventive maintenance scheduling after six months of operation. D. Place the
monitor in storage until the manufacturer's next inspection.
Answer: A. Acceptance testing to verify
compliance with technical specifications and safe operation.
Rationale: Acceptance testing is a critical
responsibility of a Biomedical Engineer II whenever new medical equipment is
received. It confirms that the equipment matches procurement specifications,
functions correctly, passes electrical safety checks, includes all accessories,
and has not been damaged during transportation. Detecting deficiencies before
clinical use protects patients, safeguards government resources, and allows
suppliers to address problems while warranty obligations remain valid.
Question 27
During routine inspection, a UPS
supporting an intensive care patient monitor frequently switches to battery
mode despite stable mains electricity. What should be investigated FIRST?
A. Replace every battery in the hospital
immediately. B. Examine the UPS input sensing and transfer circuitry for
malfunction. C. Disconnect the UPS permanently and connect equipment directly
to mains power. D. Increase the monitor's display brightness to reduce battery
usage.
Answer: B. Examine the UPS input sensing
and transfer circuitry for malfunction.
Rationale: Frequent unnecessary transfer to battery
mode despite stable mains supply suggests a fault within the UPS itself, such
as defective sensing circuits, relay problems, or calibration errors.
Biomedical engineers should diagnose the UPS before replacing batteries or
bypassing the protection system. Removing a UPS from service without
investigation may expose critical medical equipment to damaging power
interruptions.
Question 28
An ECG machine occasionally displays
excessive electrical interference even when correctly connected to the patient.
Which engineering factor should be investigated FIRST?
A. The patient's heart rhythm. B. The
paper recording speed. C. Electrical grounding and nearby sources of
electromagnetic interference. D. The color of the ECG electrodes.
Answer: C. Electrical grounding and
nearby sources of electromagnetic interference.
Rationale: Excessive ECG noise commonly results
from poor grounding, loose earth connections, damaged lead wires, nearby
electrical equipment, or electromagnetic interference rather than faults within
the patient's heart. Biomedical engineers should first evaluate environmental
and electrical conditions before replacing internal electronic components.
Correct grounding is essential for both signal quality and electrical safety.
Question 29
Which maintenance approach BEST minimizes
unexpected breakdowns of life-support equipment while using available technical
resources efficiently?
A. Repair equipment only after complete
failure occurs. B. Perform maintenance solely when requested by clinical staff. C.
Replace equipment annually regardless of condition. D. Prioritize preventive
maintenance according to equipment risk and clinical importance.
Answer: D. Prioritize preventive
maintenance according to equipment risk and clinical importance.
Rationale: Risk-based preventive maintenance
focuses engineering resources on equipment whose failure would have the
greatest impact on patient safety and healthcare delivery. Life-support devices
require closer monitoring and more frequent servicing than low-risk equipment.
This strategy improves equipment reliability, reduces emergency repairs,
minimizes downtime, and supports efficient use of limited maintenance budgets
in district health facilities.
Question 30
A pulse oximeter repeatedly shows lower
oxygen saturation readings than another calibrated unit when tested on the same
healthy volunteer. What is the MOST appropriate engineering action?
A. Accept the lower reading because all
pulse oximeters vary naturally. B. Increase the alarm limits to avoid false
warnings. C. Perform performance verification and calibration checks before
clinical use. D. Replace the finger sensor with one from another manufacturer
without testing.
Answer: C. Perform performance
verification and calibration checks before clinical use.
Rationale: Significant differences between two
comparable devices require objective investigation. Biomedical engineers should
verify the suspected unit using approved performance testing procedures to
determine whether calibration drift, sensor malfunction, optical contamination,
or electronic faults are responsible. Returning inaccurate monitoring equipment
to patient care could result in delayed recognition of hypoxia and
inappropriate clinical decisions.
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