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Pupil: Cycle Time

 Essay about Student: Routine Time

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FOR EXAMPLE 472 – Operations of Manufacturing Systems

Midterm, Fall 08/09

1) Express true or perhaps false for every single of the subsequent statements

( T ) In the EOQ model, the sum of holding and setup costs is fairly insensitive to the purchase quantity.

(

F ) The Wagner-Whitin algorithm will be based upon the property the fact that inventory carried to period t + 1 will be less than regarding period t

( Farreneheit ) No cycle time is one of the main targets of JIT.

( T ) With cross-training and autonomation, it becomes possible for a single staff member to operate several machines at the same time.

(

N ) The classical Kanban system used three types of greeting cards: a creation card, a move credit card and a sequencing greeting card.

(

Farrenheit ) In MRP, pegging is the change action of netting.

( T ) Nervousness in MRP arises when a tiny change in the master creation schedule ends in a large difference in planned order releases. (

F ) The JIT's target of zero-inventory cannot be achieved in systems that utilize MRP.

( Capital t ) Almost, increasing throughput must be accompanied with increasing the amount of WIP as long as the bottleneck rate is not come to. ( Farreneheit ) The bottleneck place is referred to as the one that provides the lowest usage.

(

Farrenheit ) Increasing the number of parallel machines within a non-bottleneck workstation reduces the cycle time.

( Farreneheit ) In a balanced production line, pattern time turns into the inverse of the throughput at WIP levels higher than the crucial WIP.

( F ) The higher the practical most severe case routine time is usually, the better the production range will be.

(

F ) In the lean philosophy, " muda” can be achieved by carrying out " kaizen” events.

2) The product framework trees intended for products A and F are demonstrated below. Part of the master production schedule showing when the company will complete production procedures for amounts of these items is displayed in the table below. Discover the gross requirements for item M throughout the 1st 12 several weeks of the learn schedule.

Week

Product A

Product Farreneheit

1

2

3

5

5

6th

7

almost 8

9

twelve 11 doze 13

200 150 two hundred fifty 160 250 300 325 300 225 180 a hundred and fifty

80 one hundred and eighty 125 200 210 75 180 150 250 two hundred 260

A LT = 1 wk

2B

LT = a few wks

3C

LT sama dengan 2 wks

F

LT = 2 wks

3B

2X

LUXURY TOURING = three or more wks

LT = 5 wks

1Y

LT = 2 wks

Solution:

Assuming that the lot-for-lot lot sizing rule is used for all products, we get the next planned buy releases intended for products A and N:

Week

Item A

Item F

1

2

3

4

five

6

six

8

on the lookout for

10 10 12

200 150 two hundred fifty 160 two hundred fifity 300 325 300 240 180 one hundred and fifty

80 one hundred and eighty 125 2 hundred 210 95 180 a hundred and fifty 250 200 260

13

From the data provided in the product structure trees, The gross requirements for item B = 2×Planned buy release sum of merchandise A & 3×Planned order release quantity of item F

Consequently, the major requirements for item N are given under. Week

Item B

1

2

three or more

4

your five

6

six

8

9

10

eleven

12

240 940 675 1100 950 800 1140 1100 1350 1050 1140 300

3) In issue 2, in case the ordering price for item B is usually SR50, the inventory keeping cost per unit is definitely SR zero. 15/unit/year, work with part-period-balancing whole lot sizing rule to determine the great deal sizes of item W.

Solution:

Initial, we have to adapt the products of the having cost, l = SR 0. 15/unit/year h=

0. 15

sama dengan SR 0. 003 /unit/week assuming that you will discover 50 several weeks per year. 50

Quantity intended for

Ordering price

Part-periods

period 1

Inventory

carrying expense

240

60

0

zero

1180

55

940 × 1 sama dengan 940

2 . 82

1855

50

940 + 675 × 2 = 2290

6. 87

2955

40

2290 + 1100 × 3 sama dengan 5590

of sixteen. 77

3905

50

5590 + 950 × four = 9390

28. seventeen

4705

50

9390 & 800 × 5 sama dengan 13390

forty five. 17

5845

50

13390 + 1140 × six = 20230

60. 69

Then, the amount to be purchased in period 1 is usually 4705 which will cover the demand necessity up to week 6.

Amount for

Buying cost

Part-periods

period several

Inventory

having cost

1140

50

0

0

2240

50

1100...

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