“200”, Aptitude Test
Questions and Answers for Technician II (Electrical) – Tanzania Mining
Commission (TMC).
ABSTRACT
This question-and-answer preparation pack
is designed to support candidates preparing for the Public Service online
aptitude test for the position of Technician II (Electrical) at the
Tanzania Mining Commission (TMC). The material consists of 200 carefully
developed multiple-choice questions, structured to reflect the real
examination style, difficulty, and judgment-based nature of government
aptitude tests in Tanzania. The questions assess practical understanding of
electrical installations, safety compliance, inspections, risk assessment,
maintenance practices, planning, performance management, and mining-specific
electrical hazards, rather than rote theory. Each question includes closely
related answer options to test analytical ability, with a clearly justified
correct answer to strengthen conceptual understanding. The content aligns with
the duties, responsibilities, and Diploma (FTC) qualification level
required for the position, making it a reliable revision tool for candidates
seeking to improve accuracy, confidence, and exam readiness in a highly
competitive recruitment process.
Prepared by: Technician II (Electrical).
Compiled by Johnson Yesaya Mgelwa.
A Content Creator based in Dar-es-salaam.
0628729934.
Date: November 19, 2025
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 Technician II (Electrical) – Tanzania Mining Commission (TMC)
ALL
QUESTIONS ARE COMPILED TOGETHER.
QUESTION 1
When preparing electrical engineering
plans for a mining site, which factor is MOST critical to include to ensure
operational safety and reliability?
A. Future office expansion needs | B. Load demand diversity and fault levels |
C. Paint color coding preferences | D. Availability of non-technical staff
Answer: B
Rationale:
Mining environments demand accurate assessment of electrical load demand and
potential fault levels because heavy machinery, variable operating cycles, and
harsh conditions significantly affect system stability. Ignoring fault levels
can result in inadequate protection design, leading to equipment damage or
safety hazards. Office expansion or aesthetic considerations do not influence
electrical system reliability.
QUESTION 2
Which action BEST ensures that electrical
installations in a mine comply with approved specifications?
A. Relying on contractor experience alone | B. Conducting visual checks only |
C. Verifying work against drawings and specifications | D. Approving work after
energization
Answer: C
Rationale:
Compliance is achieved by systematically comparing completed work with approved
electrical drawings and technical specifications. Visual checks alone are
insufficient, and energizing installations before verification poses serious
safety risks. Contractor experience does not replace formal inspection and
documentation requirements.
QUESTION 3
Why is proper earthing especially
important in mining electrical systems?
A. To improve lighting brightness | B. To reduce energy consumption | C. To
prevent electric shock and equipment damage | D. To simplify cable routing
Answer: C
Rationale:
Mining environments often involve moisture, metal structures, and high-power
equipment, increasing shock risk. Proper earthing provides a safe path for
fault currents, preventing electric shock and minimizing equipment damage. It
does not affect lighting brightness, energy efficiency, or cable layout
directly.
QUESTION 4
During a workplace electrical inspection,
a technician discovers exposed conductors near a conveyor system. What is the
MOST appropriate immediate action?
A. Report during monthly review | B. Cover the conductors temporarily | C.
Isolate the power and report immediately | D. Ignore if no accident has
occurred
Answer: C
Rationale:
Exposed conductors present an immediate electrocution and fire risk. Power must
be isolated promptly to eliminate danger before corrective measures are taken.
Delaying action or applying temporary covers without isolation exposes workers
to serious hazards and violates safety procedures.
QUESTION 5
Which document MOST supports
accountability during electrical risk assessment in mining operations?
A. Equipment supplier brochure | B. Risk assessment report | C. Daily
attendance register | D. Store inventory list
Answer: B
Rationale:
A risk assessment report formally identifies hazards, evaluates risks, and
outlines mitigation measures. It provides evidence of due diligence and
accountability. Supplier brochures and inventory records do not document risk
evaluation or safety controls.
QUESTION 6
What is the PRIMARY purpose of lock-out
and tag-out procedures during electrical maintenance?
A. Speeding up repair work | B. Preventing unauthorized energization | C.
Reducing maintenance costs | D. Improving equipment lifespan
Answer: B
Rationale:
Lock-out and tag-out procedures ensure that equipment cannot be energized
accidentally during maintenance, protecting workers from electric shock or
mechanical injury. While they may indirectly affect costs or lifespan, safety
is the core objective.
QUESTION 7
When planning an electrical safety
training program for mine workers, which approach is MOST effective?
A. One-time induction session | B. Theory-only classroom lectures | C. Regular
training with practical demonstrations | D. Training only supervisors
Answer: C
Rationale:
Regular training combined with practical demonstrations reinforces
understanding and ensures workers can apply safety procedures in real
situations. One-time or theory-only sessions are less effective, and excluding
non-supervisory staff weakens overall safety culture.
QUESTION 8
Which factor should a technician consider
FIRST when selecting cables for mining electrical installations?
A. Color availability | B. Cost of the cable | C. Current-carrying capacity and
environment | D. Supplier proximity
Answer: C
Rationale:
Cable selection must prioritize current-carrying capacity and environmental
conditions such as heat, moisture, and mechanical stress common in mines. Cost
and supplier convenience are secondary to safety and performance requirements.
QUESTION 9
What is the MAIN objective of conducting
periodic electrical inspections in mining operations?
A. Meeting audit timelines | B. Identifying potential hazards early | C.
Increasing equipment usage | D. Reducing paperwork
Answer: B
Rationale:
Periodic inspections aim to detect faults, deterioration, or unsafe conditions
before they cause accidents or failures. Audits and paperwork are secondary
outcomes, not the primary safety purpose.
QUESTION 10
If an electrical installation deviates
slightly from approved drawings but appears functional, what should the
technician do?
A. Approve since it works | B. Ignore minor deviations | C. Report and seek
approval for changes | D. Modify drawings after installation
Answer: C
Rationale:
Any deviation from approved drawings must be reported and formally approved to
maintain compliance, safety, and accountability. Functionality alone does not
guarantee safety or regulatory acceptance.
QUESTION 11
Which condition MOST increases electrical
risk in underground mining environments?
A. High ceiling height | B. Limited ventilation and moisture | C. Natural
lighting | D. Short cable runs
Answer: B
Rationale:
Moisture and limited ventilation increase the likelihood of insulation failure
and electric shock. These conditions require stricter safety controls than
surface installations.
QUESTION 12
Why is it important to document
electrical inspection findings?
A. For future reference and corrective action tracking | B. To justify overtime
| C. To increase report volume | D. To replace physical repairs
Answer: A
Rationale:
Documentation allows tracking of identified issues, corrective actions, and
compliance over time. It supports accountability and continuous safety
improvement but does not replace actual repairs.
QUESTION 13
What is the BEST indicator that an
electrical risk control measure is effective?
A. No worker complaints | B. Reduced incidents and near misses | C. Increased
power consumption | D. Fewer inspection reports
Answer: B
Rationale:
A reduction in incidents and near misses demonstrates that control measures are
functioning effectively. Absence of complaints or fewer reports does not
necessarily reflect actual safety performance.
QUESTION 14
When developing individual performance
objectives, which principle should guide an electrical technician?
A. Vague and flexible targets | B. Targets unrelated to duties | C. Clear,
measurable, and achievable objectives | D. Supervisor-only objectives
Answer: C
Rationale:
Performance objectives should be specific, measurable, achievable, relevant,
and time-bound to ensure accountability and effective performance evaluation.
Vague or unrelated targets reduce effectiveness.
QUESTION 15
Which test BEST confirms insulation
integrity in electrical equipment?
A. Continuity test | B. Insulation resistance test | C. Voltage drop test | D.
Polarity test
Answer: B
Rationale:
An insulation resistance test measures the effectiveness of insulation in
preventing leakage current. Continuity and polarity tests assess connections,
not insulation condition.
QUESTION 16
What is the MOST appropriate response if
repeated electrical faults occur in the same mining equipment?
A. Replace fuses repeatedly | B. Ignore until major failure | C. Conduct root
cause analysis | D. Increase operating voltage
Answer: C
Rationale:
Repeated faults indicate underlying issues that require systematic root cause
analysis to prevent recurrence. Temporary fixes or voltage changes can worsen
safety risks.
QUESTION 17
Which role does a technician play in
ensuring compliance with electrical safety standards?
A. Enforcement only | B. Advisory role only | C. Implementation and monitoring
| D. Policy formulation
Answer: C
Rationale:
Technicians are responsible for implementing safety measures and monitoring
compliance during daily operations. Policy formulation is usually a management
function.
QUESTION 18
Why should electrical risk assessments be
reviewed periodically?
A. To increase documentation | B. Because risks change over time | C. To
satisfy equipment suppliers | D. To reduce inspection frequency
Answer: B
Rationale:
Mining operations evolve due to equipment changes, expansion, or environmental
factors, requiring regular review of risk assessments to ensure continued
effectiveness.
QUESTION 19
Which situation MOST requires immediate
electrical risk reassessment?
A. Installation of new high-power machinery | B. Change of supervisor | C.
Annual audit schedule | D. Change in shift pattern
Answer: A
Rationale:
New high-power machinery introduces new electrical loads and hazards,
necessitating immediate reassessment to prevent overloads and safety failures.
QUESTION 20
What is the PRIMARY benefit of involving
management in electrical safety programs?
A. Faster procurement | B. Shared safety responsibility | C. Reduced training
time | D. Less technician workload
Answer: B
Rationale:
Management involvement reinforces safety culture, ensures resource allocation,
and promotes shared responsibility. It does not primarily reduce workload or
training needs.
QUESTION 21
Which factor MOST affects electrical
equipment lifespan in mining operations?
A. Brand reputation | B. Equipment color | C. Installation date | D. Environmental
conditions
Answer: D
Rationale:
Dust, moisture, vibration, and temperature extremes in mining environments
significantly affect equipment longevity, regardless of brand or appearance.
QUESTION 22
Why should temporary electrical
installations in mines be closely monitored?
A. They are cheaper | B. They often bypass standard protections | C. They
consume less power | D. They are permanent solutions
Answer: B
Rationale:
Temporary installations may lack full protective measures, increasing risk if
not monitored closely. Their temporary nature does not reduce hazard potential.
QUESTION 23
Which method BEST ensures workers
understand electrical safety procedures?
A. Written notices only | B. Verbal warnings | C. Practical drills and
demonstrations | D. Disciplinary threats
Answer: C
Rationale:
Practical drills reinforce correct behavior and understanding more effectively
than written or verbal instructions alone.
QUESTION 24
What is the MOST appropriate way to
measure performance against individual electrical safety targets?
A. Personal opinion | B. Incident statistics and inspection results | C.
Attendance records | D. Equipment age
Answer: B
Rationale:
Performance should be measured using objective indicators such as incident
rates and inspection outcomes, not subjective opinions or unrelated records.
QUESTION 25
Why is coordination between electrical
technicians and other departments important in mining operations?
A. To reduce reporting | B. To avoid duplication of duties | C. To manage
shared safety risks effectively | D. To limit accountability
Answer: C
Rationale:
Electrical hazards often interact with mechanical and operational risks.
Effective coordination ensures hazards are identified and managed
comprehensively across departments.
QUESTION 26
When reviewing an electrical engineering
plan for a mine, which item MOST helps verify that protective devices will
operate correctly during a fault?
A. Lighting layout schedule | B. Short-circuit calculation data | C. Cable
color coding list | D. Equipment delivery timeline
Answer: B
Rationale:
Short-circuit calculation data shows the expected fault currents and allows
verification that circuit breakers, fuses, and relays can safely interrupt
faults. Without this information, protection may be under-rated, leading to
equipment damage or unsafe conditions. Lighting schedules, color coding, and
delivery timelines do not confirm protection performance.
QUESTION 27
Which practice BEST ensures continued
compliance of electrical installations after commissioning in a mining
environment?
A. One-time final inspection | B. Relying on operator experience | C. Periodic
inspection and maintenance | D. Limiting access to switch rooms
Answer: C
Rationale:
Mining environments are harsh and dynamic, causing wear, vibration, and
deterioration over time. Periodic inspection and maintenance ensure ongoing
compliance and early detection of hazards. One-time inspections and access
restrictions alone do not address progressive degradation.
QUESTION 28
What is the MAIN reason electrical
equipment in mines often requires higher ingress protection (IP) ratings?
A. To improve energy efficiency | B. To reduce installation time | C. To
withstand dust and moisture | D. To simplify maintenance records
Answer: C
Rationale:
Mining areas typically contain dust, water, and harsh conditions that can
penetrate enclosures and damage equipment. Higher IP ratings protect internal
components from these elements, reducing failure and safety risks. IP ratings
do not primarily affect energy efficiency or paperwork.
QUESTION 29
During an electrical risk assessment,
which hazard should be prioritized for heavy mobile mining equipment?
A. Office lighting glare | B. Cable overheating due to load | C. Unauthorized
computer access | D. Noise from generators
Answer: B
Rationale:
Heavy mobile equipment draws high currents and operates continuously,
increasing the risk of cable overheating and insulation failure. Addressing
this hazard reduces fire and shock risks. The other options are either
secondary or unrelated to electrical risk assessment.
QUESTION 30
Which factor MOST influences the
selection of circuit breakers for mining electrical systems?
A. Panel appearance | B. Interrupting capacity | C. Supplier warranty period |
D. Installation convenience
Answer: B
Rationale:
Circuit breakers must have sufficient interrupting capacity to safely clear the
maximum possible fault current. In mining systems with high fault levels, this
is critical for safety. Aesthetic or convenience factors do not ensure
fault-clearing capability.
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