An assembly line with 28 activities is to be balanced. The total amount of time required for all 28 activities is 88 minutes. The longest activity is 2.2 minutes and the shortest is 0.8 minutes. The line will operate for 450 minutes per day. Using a cycle time of 60 seconds, determine an assembly-line balance by selecting the longest-processing-time task available. Compute the total idle time and assembly-line efficiency.
-Using the longest-task-time rule, the efficiency of the assembly-line balance is _____.
A) less than 65%
B) more than 65% but less than 75%
C) more than 75% but less than 85%
D) more than 85% but less than 95%

Question

Quizplus · Accepted Answer

The total work time is 88 minutes, and with a cycle time of 60 seconds (1 minute), the number of workstations needed is 88. The total available time is 450 minutes, so the efficiency is (88/450) * 100%, which is more than 65% but less than 75%.

An Assembly Line with 28 Activities Is to Be Balanced