The structural engineering design section within the engineering department of a

Question

The structural engineering design section within the engineering department of a regional electrical utility corporation has developed several standard designs for a group of similar transmission line towers. The detailed design for each tower is based on one of the standard designs. A transmission line project involving 55 towers has been approved. The estimated number of engineering hours needed to accomplish the first detailed tower design is 127. Assuming a 93% learning curve, What is your estimate of the number of engineering hours needed to design the ninth tower and to design the last tower in the project? What is your estimate of the cumulative average hours required for the first seven designs? The number of engineering hours needed to design the ninth tower is 100.9 hours. (Round to one decimal place.) The number of engineering hours needed to design the last tower in the project is 83.5 hours. (Round to one decimal place.) The cumulative average hours required for the first seven designs is hours. (Round to one decimal place.)

Explanation / Answer

Answer :

b). The cumulative average hours required for the first 7 designs is : 76.4 hours (rounded off to one decimal point)

Working Note :

Learning curve = 93% (Given)

Total hours required for first detailed tower design = 127

Thus, for first 7 cumulative designs is calculated as under :

= Total hours required for first detailed tower design * .93 (i.e. learning curve %age ) for seven times

= 127 * 0.93 * 0.93 *0.93 * 0.93 * 0.93 * 0.93 * 0.93 = 76.4 hours.

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