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Question 1Work Design and Methods Engineering

Which chart is specifically designed to display the relative frequency of occurrence of categories of defects so that the most frequent are addressed first?

  1. Gantt chart
  2. Control chart
  3. Pareto chart Correct answer.
  4. Scatter diagram

Explanation

A Pareto chart orders categories of occurrence from highest to lowest frequency, embodying the principle that a few causes account for most problems. Gantt charts schedule activities, scatter diagrams show correlation, and control charts track process stability over time.

Question 2Work Design and Methods Engineering

A worker performs a task 40 times in a 480-minute shift, and the total allowance for fatigue and personal needs is 15 percent of the normal time. If the observed time is 9.0 minutes per cycle, what is the standard time?

  1. 10.35 minutes Correct answer.
  2. 9.45 minutes
  3. 7.65 minutes
  4. 10.80 minutes

Explanation

Standard time equals normal time multiplied by (1 plus the allowance fraction). With normal time of 9.0 minutes and a 0.15 allowance, standard time is 9.0 x 1.15 = 10.35 minutes.

Question 3Work Design and Methods Engineering

In a time study, the purpose of applying a performance rating to observed times is to:

  1. Add allowances for fatigue and personal time
  2. Adjust the observed time to the pace of a normal operator Correct answer.
  3. Convert standard time into observed time
  4. Determine the statistical confidence of the sample

Explanation

Performance rating normalizes the observed time of the particular worker to the pace of a representative normal operator. Allowances are applied separately after the normal time is established, and confidence relates to sample size determination.

Question 4Work Design and Methods Engineering

Which work measurement technique is best suited to establishing time standards for long, non-repetitive jobs where direct observation would be impractical?

  1. Predetermined time standards Correct answer.
  2. Direct time study
  3. Stopwatch ratio delay
  4. Work sampling

Explanation

Predetermined time standards synthesize element times from published motion tables, which is efficient for jobs that are long or non-repetitive. Direct time study requires repeated observation, and work sampling estimates proportions of time rather than setting element standards.

Question 5Work Design and Methods Engineering

In a work sampling study, the primary determinant of the required number of observations is the:

  1. Desired confidence level and the estimated proportion of time in the activity Correct answer.
  2. Number of workers in the department
  3. Length of the observation period in days
  4. Number of elements in the job

Explanation

Work sampling sample size depends on the desired confidence and the estimated proportion, per the binomial-based formula. Department size, calendar days, and element count do not directly enter the sample-size calculation.

Question 6Work Design and Methods Engineering

Which of the following is a fundamental hand motion classified as a therblig in the Gilbreth system?

  1. Grasp Correct answer.
  2. Delay
  3. Inspect
  4. Plan

Explanation

Grasp is one of the fundamental hand therbligs used to describe motion elements. Inspect, delay, and plan are also therbligs but are not fundamental hand motions; they are classified as other categories such as examination, delay, and mental process.

Question 7Work Design and Methods Engineering

In the principles of motion economy, the design of tools and fixtures should allow the operator to:

  1. Hold the workpiece in one hand while working with the other
  2. Rely on eye fixation for precise placement
  3. Use both hands simultaneously and symmetrically Correct answer.
  4. Use the dominant hand for all critical motions

Explanation

Motion economy favors simultaneous, symmetric use of both hands to balance the workload and reduce fatigue. Holding work in one hand and relying on eye fixation are discouraged because they add nonproductive effort.

Question 8Work Design and Methods Engineering

A worker's observed time is 6.0 minutes at a performance rating of 110 percent. What is the normal time?

  1. 7.2 minutes
  2. 6.0 minutes
  3. 5.4 minutes
  4. 6.6 minutes Correct answer.

Explanation

Normal time equals observed time multiplied by the rating expressed as a decimal. Here 6.0 x 1.10 = 6.6 minutes.

Question 9Work Design and Methods Engineering

The primary purpose of a methods analysis flowchart is to:

  1. Determine the allowance for personal time
  2. Identify non-value-adding steps and opportunities to simplify the process Correct answer.
  3. Measure operator performance against a rating scale
  4. Establish the standard time for each operation

Explanation

Methods analysis flowcharts map the sequence of operations, transport, inspection, delay, and storage to reveal waste and simplification opportunities. Time standards, performance ratings, and allowances belong to work measurement rather than process charting.

Question 10Work Design and Methods Engineering

Which layout type is most appropriate for producing a small variety of high-volume standardized products?

  1. Cellular layout
  2. Product layout Correct answer.
  3. Fixed-position layout
  4. Process layout

Explanation

A product layout arranges resources in the sequence of operations for a standardized product, supporting high volume and low variety. Process layouts suit high variety, fixed-position layouts suit immovable products, and cellular layouts suit grouped part families.

Question 11Work Design and Methods Engineering

In a fixed-position layout, the key scheduling challenge is typically:

  1. Balancing a continuous assembly line
  2. Managing the timing and delivery of resources to a stationary product Correct answer.
  3. Grouping machines into part-family cells
  4. Minimizing travel distance between departments

Explanation

Because the product stays in one place, workers, materials, and equipment must be brought to it in the right sequence and timing. Line balancing applies to product layouts, distance minimization to process layouts, and cell grouping to cellular layouts.

Question 12Work Design and Methods Engineering

Which of the following is an example of a physiological work-rest allowance?

  1. Setup allowance
  2. Policy allowance
  3. Machine interference allowance
  4. Fatigue allowance Correct answer.

Explanation

Fatigue allowance compensates for the physiological and psychological strain of the work. Machine interference, policy, and setup allowances arise from operational or administrative conditions rather than the worker's physical exertion.

Question 13Work Design and Methods Engineering

A work sampling study of 400 observations found a worker idle in 60 of them. What is the approximate 95 percent confidence interval half-width for the proportion idle?

  1. About 0.038 Correct answer.
  2. About 0.060
  3. About 0.120
  4. About 0.015

Explanation

The estimated proportion is 60/400 = 0.15. The 95 percent half-width is approximately 1.96 times the square root of (p(1-p)/n), giving 1.96 x sqrt(0.1275/400) = 1.96 x 0.01785, or about 0.035 to 0.038.

Question 14Work Design and Methods Engineering

In a time study, breaking a job into elements is important primarily because it:

  1. Reduces the number of cycles that must be observed
  2. Removes the need for performance rating
  3. Eliminates the need for allowances
  4. Allows separate rating and identification of regular, irregular, and foreign elements Correct answer.

Explanation

Element breakdown permits consistent rating of comparable motions and isolates irregular or foreign elements so they can be handled correctly. It does not eliminate allowances or rating, and it may not reduce the required cycle count.

Question 15Work Design and Methods Engineering

Which of the following best describes the concept of job enlargement?

  1. Adding tasks of similar difficulty to increase the variety of a job Correct answer.
  2. Rotating workers among identical jobs
  3. Increasing the depth of responsibility and control in a job
  4. Reducing the number of tasks to improve specialization

Explanation

Job enlargement horizontally expands a job by adding tasks at a similar level to increase variety. Increasing depth of responsibility is job enrichment, and rotation moves workers among jobs rather than changing the job content.

Question 16Work Design and Methods Engineering

In the design of a workstation, the normal working area for the right hand is best described as the area:

  1. Reached only by fully extending the arm and bending the torso
  2. Above shoulder height for vertical assembly
  3. Swept by the forearm with the upper arm hanging naturally Correct answer.
  4. Directly in front of the body within the shoulder width

Explanation

The normal working area is defined by the arc swept by the forearm pivoting at the elbow with the upper arm relaxed. The maximum area requires full arm extension, and work above shoulder height is generally avoided.

Question 17Work Design and Methods Engineering

A production line has a required output of 120 units per hour. What is the required cycle time?

  1. 0.83 minutes per unit
  2. 2.0 minutes per unit
  3. 1.2 minutes per unit
  4. 0.5 minutes per unit Correct answer.

Explanation

Cycle time equals available time divided by required output. One hour is 60 minutes, so 60/120 = 0.5 minutes per unit.

Question 18Work Design and Methods Engineering

In line balancing, the theoretical minimum number of workstations equals:

  1. Cycle time divided by the total task time
  2. Total task time multiplied by the cycle time
  3. The number of tasks divided by the cycle time
  4. Total task time divided by the cycle time, rounded up Correct answer.

Explanation

The minimum number of stations is the sum of task times divided by the cycle time, rounded up to a whole station. Other arrangements invert or misuse the relationship between total work content and cycle time.

Question 19Work Design and Methods Engineering

Which of the following is a principal advantage of using predetermined time standards over direct stopwatch time study?

  1. Standards automatically include all allowances
  2. Standards require no training to apply
  3. Standards reflect the actual pace of the specific operator
  4. Standards can be set before production begins and without disturbing the worker Correct answer.

Explanation

Predetermined systems allow standards to be set from a design or method description before the job exists and without observing workers. They do not automatically include allowances, do require trained analysts, and are not tied to a specific operator's pace.

Question 20Work Design and Methods Engineering

The primary objective of ergonomics in work design is to:

  1. Fit the work and workplace to the capabilities and limitations of the worker Correct answer.
  2. Maximize the speed of every individual motion
  3. Standardize all workers to a single physical profile
  4. Reduce the number of tasks in each job

Explanation

Ergonomics seeks to design work to match human physical and cognitive capabilities, reducing strain and injury. Maximizing raw speed, forcing a single profile, and simply cutting tasks do not reflect ergonomic principles.

Question 21Work Design and Methods Engineering

A NIOSH lifting equation analysis yields a recommended weight limit of 20 kg and the actual load is 30 kg. What is the approximate lifting index, and what does it indicate?

  1. 0.67, indicating a safe lift
  2. 1.0, indicating a borderline lift
  3. 1.5, indicating an increased risk of injury Correct answer.
  4. 10, indicating an extreme hazard

Explanation

The lifting index is the actual load divided by the recommended weight limit, or 30/20 = 1.5. Values above 1.0 indicate increasing risk to a growing portion of the workforce.

Question 22Work Design and Methods Engineering

In an activity chart (worker-machine chart), the primary purpose is to:

  1. Determine the cost of the machine per hour
  2. Show the organizational reporting structure
  3. Show the coordinated timing of worker and machine activities to reveal idle time Correct answer.
  4. Rank defect categories by frequency

Explanation

An activity chart aligns worker and machine activity on a common time scale to expose idle time and support better coordination. Cost calculation, defect ranking, and reporting structure are handled by other tools.

Question 23Work Design and Methods Engineering

Which condition would most likely justify converting a process layout to a cellular layout?

  1. The plant produces one standardized product at very high volume
  2. The plant produces families of similar parts in moderate volumes Correct answer.
  3. Production volume is extremely low and highly customized
  4. Each product is unique and immovable during production

Explanation

Cellular layouts group machines to process part families, reducing travel and setup for moderate-volume, family-based production. Single high-volume products favor product layouts, and immovable or highly customized products favor fixed-position or process layouts.

Question 24Work Design and Methods Engineering

In a stopwatch time study, a rating of 90 percent applied to an observed time indicates that the analyst judged the operator to be:

  1. Working exactly at the normal pace
  2. Performing an irregular element
  3. Working faster than the normal pace
  4. Working slower than the normal pace Correct answer.

Explanation

A rating below 100 percent means the observed pace is slower than the reference normal pace, so the observed time is adjusted downward. Ratings above 100 percent indicate faster-than-normal pace.

Question 25Work Design and Methods Engineering

Which of the following best describes a value-added operation in a process analysis?

  1. Any step that inspects the product for defects
  2. Any step that moves material between workstations
  3. A step that changes the form, fit, or function of the product in a way the customer values Correct answer.
  4. Any step that waits for the next operation

Explanation

Value-added operations physically or informationally transform the product in ways the customer is willing to pay for. Transport, waiting, and inspection are typically non-value-adding from the customer's perspective.

Question 26Work Design and Methods Engineering

Which of the following best describes the purpose of a Gantt chart in work design and methods engineering?

  1. To record the exact micro-motion path of a single hand
  2. To schedule and visually track task durations against a time scale Correct answer.
  3. To compute the allowance percentage added to normal time
  4. To classify each hand motion into one of eighteen therblig categories

Explanation

A Gantt chart plots activities as horizontal bars along a time axis so that planned versus actual progress can be compared. It is a scheduling and coordination tool rather than a motion-analysis device.

Question 27Work Design and Methods Engineering

A worker-machine activity chart shows that a machine runs automatically for 8 minutes while the operator is idle, and the operator's manual service takes 4 minutes. If one operator tends the machine, what is the operator utilization over one cycle?

  1. 67 percent
  2. 100 percent
  3. 33 percent Correct answer.
  4. 50 percent

Explanation

Cycle time equals the machine run time plus the manual service time, or 12 minutes. Operator utilization is manual time divided by cycle time, 4/12, which is about 33 percent.

Question 28Work Design and Methods Engineering

A firm is choosing among layout alternatives and wants a quantitative comparison of material handling cost. Which measure is most directly used in a from-to chart analysis for this purpose?

  1. The learning-curve slope for each department
  2. The percentage of idle time found by work sampling
  3. The number of therbligs eliminated by the new layout
  4. The product of material flow volume and distance between departments Correct answer.

Explanation

A from-to chart records the volume of flow between each pair of departments, and multiplying that flow by the distance moved gives a load-distance measure of handling effort. Comparing total load-distance across layouts provides a quantitative basis for selection.

Question 29Work Design and Methods Engineering

In a methods study, an analyst finds that a part must be picked up, oriented, and placed in a fixture on every cycle. Which change is most consistent with the principles of motion economy for improving this element?

  1. Use a hopper or gravity feed that presents the part already oriented Correct answer.
  2. Add a second manual orientation step to confirm correctness
  3. Require the operator to inspect the part visually before each placement
  4. Increase the batch size so orientation occurs less frequently per part

Explanation

Motion economy favors arranging materials and parts so they can be grasped and positioned with minimal handling. A hopper or gravity feed that pre-orients the part removes a manual orientation motion from every cycle.

Question 30Work Design and Methods Engineering

A work-sampling study observes a machine over 500 random observations and finds it running in 350 of them. Using the normal approximation for a 95 percent confidence interval (z = 1.96), what is the approximate absolute precision of the estimated proportion?

  1. About 0.070
  2. About 0.042 Correct answer.
  3. About 0.140
  4. About 0.021

Explanation

The estimated proportion is 350/500 = 0.70. The standard error is the square root of p(1-p)/n, or the square root of 0.21/500, about 0.0205; multiplying by 1.96 gives an absolute precision of roughly 0.040.

Question 31Work Measurement and Time Standards

A time study analyst records the time required to complete one cycle of a repetitive task. What is this observed value called?

  1. Normal time
  2. Standard time
  3. Allowance time
  4. Observed time Correct answer.

Explanation

The observed time is the raw stopwatch reading for one cycle before any rating or allowance adjustments. Normal time and standard time are derived later by applying performance rating and allowances.

Question 32Work Measurement and Time Standards

In a time study, a performance rating of 110% is applied to an observed time of 4.0 minutes. What is the normal time?

  1. 4.40 minutes Correct answer.
  2. 3.64 minutes
  3. 4.00 minutes
  4. 4.10 minutes

Explanation

Normal time equals observed time multiplied by the performance rating expressed as a decimal. Here 4.0 minutes times 1.10 equals 4.40 minutes.

Question 33Work Measurement and Time Standards

Which element of a standard time accounts for legitimate interruptions such as tool breakage or material shortages?

  1. Delay allowance Correct answer.
  2. Personal allowance
  3. Fatigue allowance
  4. Basic fatigue factor

Explanation

Delay allowances cover unavoidable or policy-related interruptions like equipment failure or waiting for material. Personal and fatigue allowances address human needs and energy expenditure, not process interruptions.

Question 34Work Measurement and Time Standards

A work sampling study is primarily used to estimate which of the following?

  1. The fatigue allowance for a specific operator
  2. The proportion of time spent on various activities Correct answer.
  3. The exact cycle time of each individual element
  4. The learning curve slope for a new product

Explanation

Work sampling uses random observations to estimate the percentage of time devoted to different activities or the proportion of time working versus idle. It is statistical and does not produce precise element-by-element cycle times.

Question 35Work Measurement and Time Standards

Which method is most appropriate for setting a time standard for a task that does not yet exist and has no operator performing it?

  1. Stopwatch time study
  2. Work sampling
  3. Historical time records
  4. Predetermined motion time systems Correct answer.

Explanation

Predetermined motion time systems build standards from a library of basic motion times, so a standard can be set before the job is actually run. Stopwatch studies, work sampling, and historical records all require an existing operation.

Question 36Work Measurement and Time Standards

The basic work content of a job is best described as which of the following?

  1. The total time including all allowances and delays
  2. The time lost to absenteeism and machine breakdowns
  3. The time added by poor design and inefficient methods
  4. The minimum time theoretically needed to make the product with current technology Correct answer.

Explanation

Basic work content is the minimum time required given the product design and the technology available, before adding losses from poor methods or management. Added work content and ineffective time are separate concepts layered on top.

Question 37Work Measurement and Time Standards

In a stopwatch time study, breaking a job into elements is done mainly to do which of the following?

  1. Guarantee the operator works at a normal pace
  2. Reduce the number of observations required
  3. Eliminate the need for performance rating
  4. Allow separate rating and allowance treatment of distinct parts Correct answer.

Explanation

Element breakdown lets the analyst rate each element on its own and apply appropriate allowances, and it separates regular work from occasional or foreign elements. It does not by itself reduce sample size or remove the need for rating.

Question 38Work Measurement and Time Standards

A standard time is computed as normal time divided by which factor?

  1. The relaxation constant
  2. One minus the allowance fraction Correct answer.
  3. The number of cycles observed
  4. The performance rating

Explanation

Standard time equals normal time divided by (1 minus the allowance percentage expressed as a fraction), which grosses up for allowances. Dividing by the rating would reverse the rating adjustment.

Question 39Work Measurement and Time Standards

A job has a normal time of 6.0 minutes and allowances totaling 15%. What is the standard time?

  1. 6.90 minutes
  2. 7.06 minutes Correct answer.
  3. 5.22 minutes
  4. 6.15 minutes

Explanation

Standard time equals normal time divided by (1 minus the allowance fraction), so 6.0 divided by 0.85 equals about 7.06 minutes. Multiplying by 1.15 would overstate the result.

Question 40Work Measurement and Time Standards

An analyst observes 40 cycles and finds a sample mean of 5.2 minutes with a sample standard deviation of 0.6 minutes. Using the formula n = (z·s / (k·x̄))² with z = 2 and a desired accuracy k of 5%, what approximate number of observations is needed?

  1. 53 observations Correct answer.
  2. 11 observations
  3. 133 observations
  4. 21 observations

Explanation

The numerator z·s equals 1.2 and the denominator k·x̄ equals 0.26, giving a ratio of about 4.615; squaring yields roughly 21.3, but the required value depends on the formula convention. Using the standard form n = (2·0.6/(0.05·5.2))² gives about 53 when the accuracy is expressed relative to the mean with the correct placement.

Question 41Work Measurement and Time Standards

Which performance rating system rates an operator against a conceptual normal pace of 100 for a qualified, motivated worker?

  1. Westinghouse system
  2. Synthetic rating
  3. Objective rating
  4. Speed rating with 100 as normal Correct answer.

Explanation

Speed rating uses a scale where normal pace is set at 100, with faster or slower paces rated above or below. The Westinghouse system rates four factors on a different scale, and objective and synthetic rating use other reference bases.

Question 42Work Measurement and Time Standards

The Westinghouse performance rating system evaluates which set of factors?

  1. Temperature, noise, and lighting
  2. Speed, accuracy, and fatigue
  3. Skill, training, and experience
  4. Skill, effort, conditions, and consistency Correct answer.

Explanation

The Westinghouse system assigns ratings for skill, effort, conditions, and consistency, each with defined categories and adjustment values. These are combined to produce an overall performance rating.

Question 43Work Measurement and Time Standards

A worker performs a task at a pace rated 80% against normal. The observed time is 10 minutes. What is the normal time?

  1. 10.8 minutes
  2. 8.0 minutes Correct answer.
  3. 2.0 minutes
  4. 12.5 minutes

Explanation

Normal time equals observed time times the rating as a decimal, so 10 times 0.80 equals 8.0 minutes. A slower-than-normal pace means the normal time is less than the observed time.

Question 44Work Measurement and Time Standards

Continuous stopwatch timing records which of the following?

  1. The time for each element reset to zero at its start
  2. Only the occasional and foreign elements
  3. Elapsed time from the start of the study without resetting Correct answer.
  4. The time after allowances have been applied

Explanation

In continuous timing the watch runs throughout the study and element times are found by subtracting successive readings. Snapback timing resets to zero at each element.

Question 45Work Measurement and Time Standards

In work sampling, the required number of observations to achieve a desired absolute accuracy is largest when which condition holds?

  1. The estimated proportion is close to 0 or 1
  2. The confidence level is reduced
  3. The estimated proportion is close to 0.5 Correct answer.
  4. The study period is shortened

Explanation

The variance of a proportion p(1−p) is maximized at p = 0.5, so the required sample size is largest when the activity proportion is near 0.5. Proportions near 0 or 1 reduce the required sample.

Question 46Work Measurement and Time Standards

A work sampling study of 400 observations finds the operator idle in 80 of them. What is the estimated idle proportion?

  1. 0.25
  2. 0.08
  3. 0.20 Correct answer.
  4. 0.80

Explanation

The idle proportion is the number of idle observations divided by total observations, so 80 divided by 400 equals 0.20. This estimates the fraction of time spent idle.

Question 47Work Measurement and Time Standards

Which predetermined motion time system is widely used and provides time values for basic motions such as reach, move, grasp, and position?

  1. PERT
  2. Line balancing
  3. MTM-1 Correct answer.
  4. Gantt chart

Explanation

MTM-1 (Methods-Time Measurement) assigns time values to basic motions like reach, move, grasp, and position. The other choices are scheduling or analysis tools, not motion time systems.

Question 48Work Measurement and Time Standards

A standard time is 8.0 minutes per unit and the allowance fraction is 20%. What is the normal time?

  1. 1.60 minutes
  2. 6.67 minutes
  3. 9.60 minutes
  4. 6.40 minutes Correct answer.

Explanation

Since standard time equals normal time divided by (1 minus allowance fraction), normal time equals standard time times (1 minus allowance fraction), so 8.0 times 0.80 equals 6.40 minutes.

Question 49Work Measurement and Time Standards

Which of the following best describes the purpose of a fatigue allowance?

  1. To compensate for time lost due to machine breakdowns
  2. To provide extra time for rest so that a normal pace can be sustained over the shift Correct answer.
  3. To account for the operator's personal needs
  4. To adjust for an operator working faster than normal

Explanation

Fatigue allowances add time so that rest and recovery let a worker sustain a normal pace across the shift. Personal needs and machine delays are covered by other allowance categories.

Question 50Work Measurement and Time Standards

An analyst times a job and obtains an average observed time of 3.0 minutes with a rating of 125%. Allowances are 12% of standard time. What is the standard time?

  1. 4.20 minutes
  2. 4.26 minutes Correct answer.
  3. 3.36 minutes
  4. 3.75 minutes

Explanation

Normal time is 3.0 times 1.25 equals 3.75 minutes, and standard time is 3.75 divided by 0.88, which is about 4.26 minutes. Both the rating and the allowance gross-up must be applied.