Question

9. A 3-period moving average places

                        (a) more weight

                        (b) less weight

                        (c) the same weight

   on a new data point than exponential smoothing with alpha=0.2.

10. A process with a linear trend can best be forecasted using

                        (a) regression

                        (b) basic (first-order) exponential smoothing

                        (c) seasonal indices

                        (d) a or b

                        (e) none of the above

11. A basic assumption for the EOQ model is

                        (a) quantity discounts are allowed

                        (b) demand is growing linearly

                        (c) stock-outs can occur

                        (d) demand is constant

12. A “kanban” is

                        (a) a type of push system

                        (b) a production control system that limits inventory

                        (c) a lot-sizing technique similar to EPQ

                        (d) a visual signal used in a pull production system

                        (e) none of the above

13. Which of the following methods will always produce schedules with the minimum mean

            tardiness on a single machine?

                        (a) shortest processing time

                        (b) earliest due date

                        (c) Hodgson's algorithm

                        (d) none of the above

14. A cellular manufacturing system (CMS) may not be preferred over a job shop in some

            situations because

1. a CMS may require a more highly-skilled labor force, which may not

be available

                        (b)        a CMS may require more machines, if machines cannot be shared

                                    between cells

                        (c)        a CMS usually requires longer setup times than in a job shop

                        (d)       a and b

                        (e)        a, b, and c

15. A major drawback of the SPT dispatching rule for dynamic arrivals is

                        (a) it ignores due dates

                        (b) it is hard to implement

                        (c) it makes long jobs wait

                        (d) shorter jobs tend to be less important

                        (e) none of the above

16. Group technology generally provides improvements over job shops by

                        (a) simplifying material flow

                        (b) reducing setup times

                        (c) reducing the number of machines required

                        (d) a and b

                        (e) a and c

Answer 1

9) a

In case of three month moving average, the weight of each unit is 33.3% as it is 100%/3. Hence, for any new unit, the weight will be 33.3%. In case of exponential smoothing with alpha = 0.2, the weight of new unit will be 0.2 or 20%. Hence, three month moving average places more weight

10) a

The regression can be used in case of linear trend. Below is the formula:

11) d

EOQ = sqrt(2*D*S/H)

D = Annual demand

S = Ordering or set up cost

H = Holding or carrying cost

So, in EOQ, the demand is assumed as fixed or constant

12) d

Kanban is an important concept to control the inventory in system. It works in pull concept wherein once the demand comes, products are produced. It is against the belief of Push system in which goods are produced in advance irrespective of demand. So, it helps to replace the inventory of goods that has been removed and maintain smooth flow. It maintains visual to manage flow of goods in the process