Certified Industrial Engineer (CIE) Examination — Questions and Answers

Question 1: In display design for control rooms, what does the 'primary zone' of a visual display refer to?

The area where emergency alarms are placed
The central field of view typically within ±15° from line of sight (Correct answer)
The area accessible without moving the head
The zone reserved for digital readouts only

Correct answer: The central field of view typically within ±15° from line of sight

The primary zone (±15° from the line of sight) is where frequently consulted displays should be located to minimize eye and head movement.

Question 2: Which queuing model assumes infinite calling population, Poisson arrivals, and exponential service times with a single server?

M/D/1
M/M/s
G/G/1
M/M/1 (Correct answer)

Correct answer: M/M/1

The M/M/1 model denotes Markovian (Poisson) arrivals, Markovian (exponential) service, and one server.

Question 3: A manufacturer produces 500 units/day and the defect rate is 2%. Using Six Sigma terminology, reducing defects to 3.4 per million opportunities represents which sigma level?

Three sigma
Four sigma
Six sigma (Correct answer)
Five sigma

Correct answer: Six sigma

Six Sigma by definition targets no more than 3.4 defects per million opportunities.

Question 4: Which of the following expressions, among Ohno's seven categories of waste, refers to the waiting period between two processes ending?

Transportation
Overproduction
Excessive inventory
Waiting (Correct answer)

Correct answer: Waiting

Among Ohno's seven categories of waste, 'Waiting' specifically refers to any period of inactivity where materials, information, or people are idle and not being processed. This includes waiting for machines, materials, or the completion of a preceding process, representing a direct loss of productive time and efficiency.

Question 5: What does the 'fatal four' refer to in construction and industrial safety?

The four leading causes of construction worker fatalities: falls, struck-by, electrocution, and caught-in/between (Correct answer)
Four OSHA recordable incident categories
Four chemical hazard classes requiring special PPE
Four types of machine guards required by OSHA

Correct answer: The four leading causes of construction worker fatalities: falls, struck-by, electrocution, and caught-in/between

OSHA identifies falls, struck-by objects, electrocution, and caught-in/between as the 'Fatal Four' because they account for the majority of construction worker deaths.

Question 6: What is the purpose of a Job Hazard Analysis (JHA)?

To systematically identify hazards associated with each step of a job task and develop controls (Correct answer)
To calculate workers' compensation premiums
To evaluate employee job performance
To document production efficiency metrics

Correct answer: To systematically identify hazards associated with each step of a job task and develop controls

A JHA breaks a job into steps, identifies the hazards at each step, and recommends controls—making it a proactive tool for preventing workplace injuries.

Question 7: What is 'confined space' entry hazard and what makes a space 'permit-required'?

A space large enough to enter but not designed for continuous occupancy, containing atmospheric, engulfment, or entrapment hazards (Correct answer)
Any space smaller than 4 ft × 4 ft
A space requiring management approval for use
Any underground area accessed by ladder

Correct answer: A space large enough to enter but not designed for continuous occupancy, containing atmospheric, engulfment, or entrapment hazards

A permit-required confined space has one or more serious hazards (hazardous atmosphere, engulfment risk, converging walls, or other recognized hazards) requiring a written entry permit.

Question 8: Which principle of motion economy suggests that both hands should begin and end their motions simultaneously?

Principle of continuous curved motion
Principle of minimum fixations
Principle of symmetry
Principle of simultaneous hand motions (Correct answer)

Correct answer: Principle of simultaneous hand motions

The principle of simultaneous hand motions reduces idle time and cognitive load by synchronizing the start and finish of both hands' movements.

Question 9: Two events A and B are mutually exclusive. If P(A) = 0.3 and P(B) = 0.4, what is P(A ∪ B)?

0.12
1.00
0.58
0.70 (Correct answer)

Correct answer: 0.70

For mutually exclusive events, P(A ∪ B) = P(A) + P(B) = 0.3 + 0.4 = 0.7.

Question 10: Which lean tool uses a visual card or signal to authorize production or material movement between processes?

Kaizen
Kanban (Correct answer)
5S
Poka-yoke

Correct answer: Kanban

Kanban cards serve as authorization signals that trigger replenishment only when downstream consumption occurs.

Question 11: In human reliability analysis, what does a Human Error Probability (HEP) of 0.01 mean?

1% of errors are detectable
There is a 1% probability of human error on a given task (Correct answer)
There are 1 error per 100 workers
1% of tasks are completed correctly

Correct answer: There is a 1% probability of human error on a given task

An HEP of 0.01 means there is a 1-in-100 probability that an operator will make an error when performing a specific task under defined conditions.

Question 12: In PERT, what probability distribution is used to model activity durations?

Exponential distribution
Normal distribution
Uniform distribution
Beta distribution (Correct answer)

Correct answer: Beta distribution

PERT uses the beta distribution to model uncertain activity durations based on optimistic, most likely, and pessimistic time estimates.

Question 13: The OSHA General Duty Clause requires employers to:

Pay workers' compensation for all injuries
Furnish a place of employment free from recognized hazards likely to cause serious harm (Correct answer)
Conduct ergonomic assessments annually
Provide ergonomic chairs to all employees

Correct answer: Furnish a place of employment free from recognized hazards likely to cause serious harm

Section 5(a)(1) of the OSH Act's General Duty Clause obligates employers to provide a workplace free from known serious hazards, including ergonomic hazards.

Question 14: What is a 'near-zero accident culture' also known as in safety management?

Zero waste culture
Six Sigma safety culture
Safety culture or high-reliability organization (HRO) culture (Correct answer)
Lean safety culture

Correct answer: Safety culture or high-reliability organization (HRO) culture

High-reliability organization (HRO) culture and safety culture both describe environments where everyone from executives to frontline workers prioritizes hazard identification and prevention.

Question 15: The expediting process entails monitoring

Flow of material and in case of trouble locate source of trouble
Minimizing the delays
Operator's activity (Correct answer)
Making efficient dispatching

Correct answer: Operator's activity

Expediting in industrial engineering focuses on ensuring that production schedules are met and that work progresses smoothly. This involves closely monitoring the actual execution of tasks and the activities of operators to identify and address any potential bottlenecks or deviations from the plan. While it contributes to minimizing delays and managing material flow, its direct action often involves overseeing the human element performing the work.

Question 16: What is the meaning of 'permissible exposure limit' (PEL) in occupational health?

The legal limit for worker exposure to a chemical or physical hazard established by OSHA (Correct answer)
The acceptable defect rate in product quality
Maximum allowable noise level in decibels
The maximum overtime hours allowed per week

Correct answer: The legal limit for worker exposure to a chemical or physical hazard established by OSHA

PELs are legally enforceable OSHA limits on worker exposure to hazardous substances or conditions, typically expressed as time-weighted averages.

Question 17: Total cost in break-even analysis includes

Fixed cost + variable cost
Fixed cost + variable cost + overheads
Fixed cost
Variable cost (Correct answer)

Correct answer: Variable cost

In break-even analysis, total cost is comprised of two main components: fixed costs and variable costs. Variable cost is a crucial element as it directly fluctuates with the volume of production. As output increases, so does the total variable cost, making it an integral part of the overall cost structure considered in break-even calculations.

Question 18: What is the purpose of a Process Hazard Analysis (PHA) in industrial facilities?

To identify, evaluate, and control hazards associated with chemical processes to prevent catastrophic releases or explosions (Correct answer)
To analyze production throughput efficiency
To review worker safety training records
To audit supplier safety management systems

Correct answer: To identify, evaluate, and control hazards associated with chemical processes to prevent catastrophic releases or explosions

PHA methods such as HAZOP, What-If, and Fault Tree Analysis systematically examine chemical processes for hazardous scenarios and recommend safeguards.

Question 19: Which lighting measurement unit is used to describe the intensity of light falling on a surface?

Watt
Candela
Foot-candle (lux) (Correct answer)
Lumen

Correct answer: Foot-candle (lux)

Foot-candles (or lux in SI) measure illuminance—the amount of light flux incident on a surface per unit area—used to specify workspace lighting levels.

Question 20: What is the assignment problem in operations research primarily used for?

Balancing assembly lines
Minimizing inventory costs
Scheduling production runs
Optimally matching n workers to n jobs (Correct answer)

Correct answer: Optimally matching n workers to n jobs

The assignment problem seeks to optimally assign n agents to n tasks to minimize total cost or maximize total profit.

Question 21: What is the individual dependability of five robots in a production line if the system reliability is 0.95?

0.9354
0.6535
0.8143
0.9897 (Correct answer)

Correct answer: 0.9897

If the five robots are in a series configuration and the overall system reliability is 0.95, then the individual reliability (R) of each robot can be found by taking the 5th root of the system reliability. So, R^5 = 0.95, which means R = (0.95)^(1/5). Calculating this yields an individual reliability of approximately 0.9897 for each robot.

Question 22: Which body posture is most associated with lower back disorder risk on the job?

Walking on level surfaces
Seated with upright spine and feet flat
Sustained forward trunk flexion combined with twisting (Correct answer)
Standing with arms at sides

Correct answer: Sustained forward trunk flexion combined with twisting

Combined trunk flexion and rotation increases spinal compressive and shear forces substantially, raising the risk of intervertebral disc injury.

Question 23: In lean manufacturing, 'Jidoka' (autonomation) refers to:

The authority and mechanism to stop production when a defect is detected (Correct answer)
Standardizing work sequences to reduce variability
Continuous improvement through small incremental changes
Balancing production flow to match takt time

Correct answer: The authority and mechanism to stop production when a defect is detected

Jidoka gives machines and workers the ability to detect abnormalities and stop the line, preventing defects from passing downstream.

Question 24: In statistical process control (SPC), the control limits on an X-bar chart are typically set at:

±1 standard deviation from the process mean
The specification limits defined by engineering
±3 standard deviations from the process mean (Correct answer)
±2 standard deviations from the process mean

Correct answer: ±3 standard deviations from the process mean

Control limits are placed at ±3σ from the process mean, capturing 99.73% of natural process variation.

Question 25: A project has an NPV of $0 at i = 14%. What does this indicate?

The project loses money
The project earns exactly 14% return (the IRR equals 14%) (Correct answer)
The project should be rejected
The MARR must be raised

Correct answer: The project earns exactly 14% return (the IRR equals 14%)

NPV = 0 at a given interest rate means that rate is the project's internal rate of return (IRR).

Question 26: What does 'slack' mean for a non-critical activity in a project network?

The buffer added to pessimistic time estimates
The amount of extra resources available
The difference between PERT and CPM estimates
The amount of time an activity can be delayed without delaying the project (Correct answer)

Correct answer: The amount of time an activity can be delayed without delaying the project

Slack (or float) is the amount of time a non-critical activity can be delayed without causing a delay in the project's completion date.

Question 27: Which nonparametric test is the rank-based alternative to the two-sample t-test?

Friedman test
Mann-Whitney U test (Correct answer)
Chi-square test
Kruskal-Wallis test

Correct answer: Mann-Whitney U test

The Mann-Whitney U test (also called Wilcoxon rank-sum test) compares two independent groups without assuming normality.

Question 28: Which ergonomic analysis tool uses a checklist to score posture risk based on neck, trunk, arm, and wrist positions?

Value Stream Mapping
SMED
RULA (Rapid Upper Limb Assessment) (Correct answer)
FMEA

Correct answer: RULA (Rapid Upper Limb Assessment)

RULA assigns scores to upper body postures and generates an action level indicating the urgency of ergonomic intervention.

Question 29: The NIOSH lifting equation provides a recommended weight limit (RWL) based on which set of task variables?

Horizontal distance, vertical height, travel distance, asymmetry, frequency, and coupling (Correct answer)
Team size, floor type, container weight, and worker strength
Load weight, travel distance, worker age, and shift length
Lifting speed, container shape, glove use, and ambient temperature

Correct answer: Horizontal distance, vertical height, travel distance, asymmetry, frequency, and coupling

The NIOSH equation uses six task factors—horizontal distance, vertical height, vertical travel, asymmetry angle, lift frequency, and hand-to-object coupling—to calculate the RWL.

Question 30: One of the fundamental requirements of an incentive program is that

A differential piece rate system should exist
Minimum wages should be guaranteed
Provide incentive to group efficiency performance
All standards should be based on time studies (Correct answer)

Correct answer: All standards should be based on time studies

For an incentive program to be fair, transparent, and effective, the performance standards used to calculate incentives must be objective and accurately reflect the expected work output. Time studies provide a scientific and systematic method for establishing these standards, ensuring they are based on observable data and reasonable expectations, thereby fostering trust and acceptance among employees.

Question 31: A job's allotted time is equal to standard time +

process allowance
unforeseen allowance.
policy allowance (Correct answer)
learning allowance
interference allowance

Correct answer: policy allowance

In industrial engineering, standard time is the time required for a qualified worker to perform a task under normal conditions, including allowances for personal needs, fatigue, and unavoidable delays. Allotted time, or allowed time, often includes an additional 'policy allowance.' This is a management-determined addition to the standard time, often for strategic reasons or to compensate for specific conditions not covered by other allowances.

Certified Industrial Engineer (CIE) Examination

The CIE exam, administered by the Industrial Engineering Certification Board (IECB) under PIIE, tests BSIE graduates on core industrial engineering knowledge including operations research, production systems, ergonomics, and industrial safety.

150

Questions

180 min

Time Limit

70%

To Pass

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