Practice Problems: Chapter 10, Human Resources and Job Design

Practice Problems: Chapter 10, Human Resources, Job Design, and Work MeasurementProblem 1:Develop a Process Chart for making a grilled cheese sandwich.

Problem 2:Develop an Activity Chart for doing three loads of laundry.

Problem 3:Develop a Process Chart for changing the oil in an automobile.

Problem 4:Develop an Activity Chart for writing a term paper.

Problem 5:Carolyn Barrett, a marketing surveyor, takes an average of 10 minutes to complete a particular questionnaire. Carolyns performance rating (pace) is 110% and there is an allowance of 15%.

What is the Normal time for completing this questionnaire?

What is the Standard time for completing this questionnaire?

Problem 6:Tom Leonard, of Leonard, Spitz, and Wareham, takes 3 hours and 25 minutes to write an end of month report. Tom is rated at 95% (work pace is 95%) and the office has a personal time allowance of 8%. There is no delay time or fatigue time.

What is the Normal time for writing an end of month report?

What is the Standard time for writing an end of month report?

Problem 7:The two steps in preparing chocolate candy bars are molding and packaging. Personal fatigue and delay allowances are set at 15%. The molding machine operator is rated at 110% and the packer is rated at 80%. Observed times per batch are given below.

Observed Time in Minutes

Task1234

Molding26302931

Packing45503530

Determine the Normal and standard times for both tasks.

Problem 8:A work-study sample of a manufacturing activity conducted over a 40-hour period shows that a worker with an 85% rating produced 12 parts. The workers idle time was 10% and the allowance factor was 12%

Find the Normal and Standard time for this activity.

Problem 9:Jim and Bob recently time-studied a janitorial task. From a sample of 75 observations, they computed an average cycle time of 15 minutes with a standard deviation of 2 minutes. Was their sample large enough that one can be 99% confident that the standard time is within 5% of the true value?

Problem 10:Consider the following task broken down into 5 MTM elements:

TMUsCode in MTM Books

Reach to tool box14.2R12D

Grasp a tool3.5BG1

Separate tool by pressing10.6AP2

Turn tool3.5T45S

Move and focus eyes13.4M12B

What is the total time for the task?

ANSWERSProblem 1:One possible solution. The level of detail in process charts depends upon the requirements of the job. Time is often included to aid analysis of value added.

Process Chart

DistanceSymbolProcess Description

10Move to cabinet

-Get loaf of bread

6Move to counter

-Open loaf of bread

-Remove two slices of bread

-Lay slices on counter-top

-Close loaf of bread

Move to cabinet

Replace loaf of bread on shelf

10Move to refrigerator

Get mustard, package of ham from refrigerator, and butter

10Move to counter

-Open package of ham

-Remove two slices of ham

-Close package of ham

-Open mustard

-Spread mustard on bread

-Close mustard

-Place ham on bread

-Close sandwich

-Open butter

-Spread butter on top slice of bread

5Move to stove

-Get fry pan

-Turn heat on under fry pan

-Wait for pan to heat

5Move to counter

-Get sandwich & butter

5Move to stove

-Place sandwich, buttered-side down in pan

-Butter top slice

-Close butter

5Move to counter

-Pick up ham, mustard, and butter

10Move to refrigerator

-Return butter, mustard, and ham to refrigerator

5Move to stove

-Wait for sandwich to brown on bottom

-Inspect

-Flip sandwich

-Wait for sandwich to brown on bottom

-Inspect sandwich

10Move to serving area

-Serve sandwich

Problem 2:TimeOperatorMachine 1

WasherMachine 2

Dryer

Load clothes and detergent in to Machine 1Being loadedIdle

IdleRunIdle

Remove clothes from Machine 1Being unloadedIdle

Load clothes into Machine 2IdleBeing loaded

Load clothes and detergent into Machine 1Being loadedRun

IdleRunRun

Remove clothes from Machine 2IdleBeing unloaded

Hang clothesIdleIdle

Problem 3:One solution might be:

Process Chart for

Changing Oil in Car

DistanceSymbol

-Check that needed filter is in stock

-Check that oil is in stock

30Move to car

Get into car

-Start engine

-Idle car to warm engine

-Drive car onto lift

-Stop engine

Release hood catch

-Get out of car

10Go to lift control

Raise lift

10Go to toolbox

Get wrench

Get container for drained oil

Get rag

10Walk under lift

-Wipe around oil drain plug

-Loosen oil drain plug

-Position container

-Remove oil drain plug

-Drain oil

-Wipe around oil drain plug

-Replace oil drain plug

-Tighten oil drain plug

20Remove container to disposal area

15Move to lift control

Lower lift

Wipe oil from wrench

5Move to toolbox

Return wrench to tool chest

Get oil filter wrench from tool chest

Get container for drained oil

10Move to car engine area

-Raise hood

Find oil filter

-Loosen oil filter

-Position container

Remove oil filter

20Take old filter and container of drained oil to disposal area

25Move to filter stock area

Get new filter

25Move to car engine area

-Wipe around filter mount oil seal

-Install new filter

-Tighten new filter

Remove oil filler cap

40Move to oil stock

Get oil from stock

Move to car engine compartment

Open oil container; pour in oil filler

Replace oil filler cap

Clean hands

Start engine

Idle engine

Stop engine

Check oil level

Check oil filter seal

Check oil drain plug

Wipe up any spilled oil

Take empty oil containers to disposal area

Wipe oil from oil filter wrench

25Return oil filter wrench to tool chest

Start engine

Drive car off lift

Park car for owner pickup

Return keys

Problem 4:

Activity Chart for Writing Term Paper

TimeOperatorComputer 1

DesktopComputer 2

Library

Develop topicUsed for word processing

Develop initial outlineUsed for word processing

ResearchUsed for look-up and web search

Flesh out outline with information from researchUsed for word processing

Evaluate paper

Final edit paperUsed for word processing

Proof read paperUsed for word processing

Print final copy of paperUsed for printing

Does this Activity Chart contain enough detail that you could estimate the time it would take to write the term paper?

Problem 5:

Problem 6:

Problem 7:

Observed Times in Minutes

Task1234

Molding26302931

Packing45503530

For Molding:

For Packing:

Average actual Packing time = 40 minutes

Problem 8:Average actual time = 40 hours

Problem 9:To find the number of samples required:

Therefore, the sample size of 75 is sufficient.

Problem 10:

TMUsCode in MTM Books

Reach to tool box14.2R12D

Grasp a tool3.5BG1

Separate tool by pressing10.6AP2

Turn tool3.5T45S

Move and focus eyes13.4M12B

TOTAL45.2

Remember: 1 TMU = .0006 minutes.

Translating to minutes: 45.2 TMUs * .0006 = .027 minutes

Translating to seconds: .027 minutes * 60 = 1.627 seconds

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