1. Work Measurement and Standard Setting
MGMT E
Operations and
Logistics Management
Work Measurement and Standard Setting
Homework Assignment
Due October 30th

2. Problem 1
A work operation consisting of three elements has been subjected
to a stopwatch time study. The observed times (OTs) are:
Job Element ‘A’ = .18 minutes
Job Element ‘B’ = .68 minutes
Job Element ‘C’ = .50 minutes
For a particular worker, the performance ratings are:
Job Element ‘A’ = %
Job Element ‘B’ = 110 %
Job Element ‘C’ = %
By union contract, the allowance time for the work operation is:
personal time: 5% ; delay: 5% ; fatigue: 10%
REQUIREMENT:
1. Determine the standard time for this particular worker.

3. Problem 2
The preliminary work sample of an operation indicates the following:
Number of times the operator is observed working: 60
Number of times the operator is observed idle: 40
Total number of preliminary observations: 100
REQUIREMENT:
What is the required sample size for a 99.73% confidence level
with + / - 4 % precision?

4. Problem 3 At Micro Manufacturing, Inc. workers press semiconductors
into predrilled slots on printed circuit boards.
The elemental motions for normal time used by the firm are
as follows:
Reach 6” for semiconductors…………………….40 TMU
Grasp the semiconductor………………………… 10 TMU
Move semiconductor to printed circuit board TMU
Position semiconductor……………………………35 TMU
Press semiconductor into slots…………………..65 TMU
Move board aside……………………………………20 TMU
Each time measurement unit (TMU) is equal to minutes.
REQUIREMENT:
Determine the normal time for this operation in minutes
and in seconds.

5. Problem 4 Ace Manufacturing Company has just observed a job
in its laboratory in anticipation of releasing the job to
the factory for production. The firm wants rather good
accuracy for costing and labor forecasting. Specifically,
it wants to provide a 99% confidence level and a cycle
time that is within 3% of the true value.
REQUIREMENT:
1. How many observations should it make?
The data collected so far are as follows:
Observation Time