1. The normal time for a repetitive task that produces two work units per cycle is

3.0 min. The plant uses a PFD allowance factor of 15%. Determine (a) the

standard time per piece and (b) how many work units are produced in an 8-hour

shift at standard performance.

2. The normal time to perform a repetitive manual assembly task is 4.25 min. In

addition, an irregular work element whose normal time is 1.75 min must be

performed every 8 cycles. Two work units are produced each cycle. The PFD

allowance factor is 16%. Determine (a) the standard time per piece and (b) how

many work units are produced in an 8-hour shift at standard performance. (c)

Determine the anticipated amount of time worked and the amount of time lost

per 8-hour shift that corresponds to the PFD allowance factor of 16%.

3. A worker performs a repetitive assembly task at a workbench to assemble

products. Each product consists of 25 components. Various hand tools are used

in the task. The standard time for the work cycle is 7.45 min, based on using a

PFD allowance factor of 15%. If the worker completes 75 product units during

an 8-hour shift, determine (a) the number of standard hours accomplished and (b)

worker efficiency. (c) If the worker took only one rest break, lasting 13 min, and

experienced no other interruptions during the 8 hours of shift time, determine her

worker performance.