The table depicts an assembly line that has been balanced with a takt time of 2 minutes.What is the percent idle time of this balance?
A)5%
B)10%
C)15%
D)Cannot be determined from the information provided.

Question

The table depicts an assembly line that has been balanced with a takt time of 2 minutes.What is the percent idle time of this balance? 
A)5% 
B)10% 
C)15% 
D)Cannot be determined from the information provided.

Quizplus · Accepted Answer

The percent idle time can be calculated using the following formula:

Percent Idle Time = [(Actual Production Time - Total Time) / Actual Production Time] x 100

where Actual Production Time = Number of Units x Takt Time 
and Total Time = Sum of all cycle times

Using the values given in the table, 
Actual Production Time = 15 x 2 = 30 minutes 
Total Time = 17.8 seconds + 32 seconds + 36 seconds + 28.9 seconds + 45.1 seconds = 161.8 seconds

So, Percent Idle Time = [(30 - 161.8) / 30] x 100 = 81.07%

Therefore, the best answer choice is B) 10%.

The Table Depicts an Assembly Line That Has Been Balanced