Deck 21: Operational Decision-Making Tools: Work Measurement

Question 1

Workers often do not like to be the subject of a time study and are sometimes unwilling to cooperate.

Answer 1

True

Question 2

Work sampling tends to be more disruptive on the workplace than time studies.

Answer 2

False

Question 3

As part of its quality-improvement program a company is conducting a time study for a particular job.The time study encompassed 10 job cycles,and the results include the following cumulative times and performance rating factors for each element.

The standard time for this job using an allowance factor of 16% is:

A)1.809 minutes
B)2.098 minutes
C)1.530 minutes
D)2.233 minutes

Answer 3

2.098 minutes

Question 4

As part of a time study a particular job was analyzed.The study included 20 job cycles and the following cumulative times and performance rating factors for each element were reported:

Assuming an allowance factor of 15% the standard time for this job would be

A)4.35 minutes
B)3.67 minutes
C)2.712 minutes
D)2.358 minutes

Question 5

Rating worker performance is typically an objective,easy task that can be done by any employee.

Question 6

How many cycles should be used in a time study in order to be 95% confident that the time-study average job cycle time is within 5% of the true average job cycle time.Assume that the average job cycle time was 2.67 minutes and the standard deviation of the sample was 0.72 minutes.

A)36 cycles
B)72 cycles
C)98 cycles
D)112 cycles

Question 7

Determining the length of time it takes to do a job is known as work measurement.

Question 8

Under normal circumstances and conditions,the time required by an "average" worker to perform a job once is referred to as the cycle time.

Question 9

The normal time to perform a job is calculated by dividing the elemental average by the standard time.

Question 10

Advantages of using a predetermined motion time system include all of the following except

A)worker cooperation and compliance are not required
B)ignores job context within which a single motion takes place
C)workplace is not disrupted
D)eliminates the need for subjectively determining performance ratings

Question 11

The allowance factor is a percentage increase in the normal cycle time.

Question 12

The normal times for basic,generic micro motions developed by an outside organization in a laboratory-type environment are referred to as

A)standard times
B)normal times
C)predetermined motion times
D)elemental times

Question 13

A time study is a statistical sample distribution,where the number of cycles is the sample size.

Question 14

The basic principle underlying an incentive piece-rate wage system is that workers produced more if they were paid for the additional ouput.

Question 15

In a time study,the normal time is computed as

A)the elemental average time multiplied by the rating factor
B)the elemental average time divided by the rating factor
C)the elemental average time minus the rating factor
D)the elemental average time plus the rating factor

Question 16

_____________ time is the time required by an "average" worker to perform a job under normal circumstances and conditions.

A)Stopwatch
B)Standard
C)Allowance
D)Average

Question 17

In a time study the standard time is calculated as

A)the normal cycle time plus the allowance factor
B)the normal cycle time minus the allowance factor
C)the normal cycle time divided by (1 + allowance factor)
D)the normal cycle time multiplied by (1 + allowance factor)

Question 18

As part of its quality-improvement program a company is conducting a time study for a particular job.The time study encompassed 10 job cycles,and the results include the following cumulative times and performance rating factors for each element.An allowance factor of 16% is assumed.

The normal cycle time for this job would be:

A)1.809 minutes
B)2.098 minutes
C)1.530 minutes
D)2.233 minutes

Question 19

Work sampling is an easier,cheaper,and quicker approach to work measurement than time study.

Question 20

Work sampling is a technique for determining the proportion of time a worker or machine is idle.

Question 21

List the steps in work sampling.

Question 22

A work sampling study is being conducted on a loading machine in a warehouse.How many observations should be taken if management wants to be 95% confident the estimate is within 6% of the actual proportion of time the loader is busy if management believes the loading machine is in use 70% of the time?

A)125 observations
B)175 observations
C)225 observations
D)275 observations

Question 23

As part of a time study a particular job was analyzed.The study included 20 job cycles and the following cumulative times and performance rating factors for each element were reported:

Assuming an allowance factor of 20% the standard time for this job would be

A)10.08 minutes
B)12.10 minutes
C)14.73 minutes
D)16.58 minutes

Question 24

Management believes a critical piece of equipment is busy 85% of the time.How many observations should be taken if management wants to be 98% confident the estimate is within 2.5% of the actual proportion of time the equipment is in use?

A)250 observations
B)525 observations
C)757 observations
D)1,108 observations

Question 25

Briefly discuss the advantages and disadvantages of a predetermined motion time system.

Question 26

How many cycles should be used in a time study in order to be 98% confident that the time-study average job cycle time is within 4% of the true average job cycle time.Assume that the average job cycle time was 4.25 minutes and the standard deviation of the sample was 0.65 minutes.

A)55 cycles
B)70 cycles
C)80 cycles
D)95 cycles

Question 27

For a particular time study a company would like to be 95% confident that the average job cycle time is within 2% of the true average job cycle time.Assume that the average job cycle time was 6.53 minutes and the standard deviation of the sample was 1.26 minutes.The number of cycles that should be used in this time study would be

A)174
B)358
C)463
D)864

Question 28

How many observations should be taken to be 95% confident of being within 5% of the actual time a machine is busy if it is believed that the machine is in use 75% of the time?

A)1,200 observations
B)772 observations
C)364 observations
D)289 observations

Question 29

What is work sampling and what is its primary use?

Question 30

How many observations should be taken to be 90% confident of being within 2% of the actual time a machine is busy if it is believed that the machine is in use 70% of the time?

A)2,021 observations
B)1,421 observations
C)789 observations
D)365 observations

Question 31

For a particular time study a company would like to be 90% confident that the average job cycle time is within 5% of the true average job cycle time.Assume that the average job cycle time was 15.76 minutes and the standard deviation of the sample was 3.2 minutes.The number of cycles that should be used in this time study would be

A)45
B)93
C)127
D)236