5.2 A worker-machine operation was found to involve 3.8 minutes of machine time

Question

5.2

A worker-machine operation was found to involve 3.8 minutes of machine time per cycle in the course of 40 cycles of stopwatch study. The worker’s time averaged 2.7 minutes per cycle, and the worker was given a rating of 120 percent (machine rating is 100 percent). Midway through the study, the worker took a 10-minute rest break. Assuming an allowance factor of 20 percent of work time which is applied only to the worker element (not the machine element), determine the standard time for this job. (Do not round intermediate calculations. Round your final answer to 2 decimal places.)

A worker-machine operation was found to involve 3.8 minutes of machine time per cycle in the course of 40 cycles of stopwatch study. The worker’s time averaged 2.7 minutes per cycle, and the worker was given a rating of 120 percent (machine rating is 100 percent). Midway through the study, the worker took a 10-minute rest break. Assuming an allowance factor of 20 percent of work time which is applied only to the worker element (not the machine element), determine the standard time for this job. (Do not round intermediate calculations. Round your final answer to 2 decimal places.)

Explanation / Answer

Calculation of standard time

Standard Time = Normal time

(1- Available fraction of time )

Calculating Normal time : Average Cylce Time X Worker Rating= 2.7 x 1.2(120/100) = 3.24 mnts

Now Standard time = 3.24

(1 - 0.2(20/100)

- Actual Standard of time is 4.05 Minute

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