Assignment Unit v to Unit VII

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Prepared by Dr. S. Deva Prasad & Mr. A.Hemantha Kumar, Mech. Engg Dept.

Assignment Unit V

1. Define routing. Explain the factors affecting routing procedure.

2. Explain type’s techniques available for preparing Routing.

3. Explain the basic requirements and the steps considered in routing.

4. Explain about the Route sheet.5. Distinguish between the route card and route sheet, with an example.

6. Why the worksheets are prepared? Give an example of worksheet.

7. Write short note on Bill of Materials (BOM).

8. (a) Define Scheduling.

(b) Explain different methods of scheduling

9. Explain the following techniques used for loading and scheduling:

(a) Perpetual schedule and

(b) Order schedule.

10. Differentiate loading and scheduling activities.




Assignment Unit VI1. What are the basic requirements of routing and explain with different steps considered.

(a) Explain master scheduling with suitable example(b) Explain how graphs are useful for scheduling and control problems.

2. A machine operator processes five types of products and must choose sequence for them. The set-upcost per change (Rs.) depends on the products presently on the machine and the set-up be made

according to the following table:

From productTo product

A B C D E

A - 4 7 - 4

B 4 - 6 3 4

C 7 6 - 7 -

D 3 3 7 - 6

E 4 6 4 5 -

Changeovers from A to D and C to E are not allowed. How should one sequence the products in orderto have minimum total set-up cost?

3. Describe any one quantitative technique for getting an optimal solution of a general job shop problem?4. (a) What is scheduling? What are the different scheduling methods?

(b) Explain forward scheduling and back ward scheduling.

5. For the following data, find the schedule that minimizes the mean flow time, if the number of parallel

machines is 2.

Job 1 2 3 4 5 6 7 8

Processing time (hr) 4 6 3 7 2 1 5 9

6. A bomb squad faces a terrible situation that the members wish had never happened. A terrorist hasplanted five bombs in an airport building, endangering lives and property. The squad has located allfive bombs and must now proceed to dismantle them. Because of limited staffing, the bombs can bedismantled only sequentially. Unfortunately, there is not much time left and the squad must choose

judiciously the order in which the bombs will be dismantled. The following data represents are liableestimate by the squad.

Bomb 1 2 3 4 5

Time to dismantle(hr) 3 1 2 4 1

Time remaining before the bomb will explode (hours) 9.0 11.25 11.0 6.0 5.0(a) What sequence for dismantling the bombs would you recommend to the squad?(b) What should be the criterion that the squad optimize?

7. (a) Define Scheduling. What are the principles and policies of Scheduling?(b) Five jobs are to be processed on a machine. In what sequence would the jobs be ranked according

to the following priority scheduling rules. (i) FCFS (ii) SPT. Compute the completion time for all jobs,and the Mean Flow Time.

Job A B C D E

Processing time (t j) 9 7 5 11 6Due Date (d j) 16 20 25 15 40

8. (a) What is priority scheduling? What are the criteria for priority scheduling?(b) The following jobs are waiting to be processed at a machine center. In what sequence would the

jobs be processed according to the decision rules.(i) SPT (ii) EDD. Compute the completion time forall jobs, and the Mean Flow Time.

Job A B C D E

Processing time (t j) 4 17 14 9 11

Due Date (d j) 6 20 18 12 12

9.

(a) Explain Priority Scheduling Rules. Explain with examples.




(b) The following jobs are waiting to be processed at a small machine center. Jobs are logged as theyarrive. In what sequence would the jobs be processed according to the decision rules (i) SPT (ii) EDD .Which is the best decision rule? All dates are specified as Manufacturing planning calendar days.

Assume that all the jobs arrive on day 275.

Job A B C D E

Processing time (t j) 8 16 40 5 3Due Date (d j) 313 312 325 314 314

10. (a) Differentiate Job shop Scheduling and Flow shop Scheduling.(b) The following jobs are waiting to be processed at a small machine center. In what sequence, the jobs are to be processed according to the decision rules: i). FCFS. ii) LPT. Which is the best decision

rule? All dates are specified as manufacturing planning calendar days. Assume that all the jobs arriveon day 210.

Job A B C D E

Processing time (t j) 30 16 8 20 10

Due Date (d j) 260 258 260 270 275

11. (a) Discuss various scheduling techniques.

(b) Compare forward and backward scheduling

12. (a) Explain the terms forward scheduling and backward scheduling.

(b) Explain with a neat sketch how Gantt chart is used to show

schedules. Explain the symbols used indrawing Gantt chart.

13. Draw a schedule chart and a load chart for the following data Jobs Time in Hrs on Machines

Machine

X Y

Job A 2 4

B 5 2

C 1 3

Give order of machine is first on x and then on y




Assignment Unit VII

1. Given the following data describing line balancing problem, develop a solution allowingCycle time of 3 minutes. What is the efficiency of that line?TASK A B C D E F G H I

TIME (Min) 1 1 2 1 3 1 1 2 1

PREDECESSOR A B B C,D A F G E,H

2. Given the following tasks, time and sequence, develop a balanced line capable of operating

with a 10 minute cycle time, calculate line efficiency using RPW method.TASK A B C D E F G H

TIME (Min) 3 5 7 5 3 3 5 6

PREDECESSOR A B C B,D D G

3. For the line balancing problem given below, construct the precedence diagram and computebalance delay.TASK 1 2 3 4 5 6 7 8

TIME (Min) 1 0.5 0.8 0.3 1.2 0.2 0.5 1.5

PREDECESSOR 1,2 2 3 3,4 4 5,6,7

4. The required production volume in an 8 hour shift is 480. Determine the line efficiency andbalance delay using Ranked Positional Weights method?TASK 1 2 3 4 5 6 7 8 9 10

Te 0.5 0.3 0.7 0.5 0.6 0.3 0.4 0.6 0.8 0.9

PREDECESSOR 1 1 1 3 3,4 2 5,6 4 7,8,9

5. Explain various pure strategies and mixed strategies used in Aggregate production plans.

6. What are the graphic methods of Aggregate planning? Explain their relative advantages and

disadvantages. The forecast for a group of items manufactured in a firm is shown below.Quarter 1 2 3 4 5 6 7 8

Demand 370 320 570 670 550 370 350 480

The firm estimates that it costs Rs. 200 per unit to increase the production rate, Rs. 250 per

unit to decrease the production rate, Rs.75 per unit per quarter to carry the items on inventoryand Rs.125 per unit if subcontracted. Compare the cost incurred if the following strategies are

followed:

(a) Varying the workforce size, (b) Changing the inventory levels and (c) Subcontracting.

7. (a) What is meant by Aggregate Planning? Discuss various strategies of aggregate planning.

Explain its role in manufacturing.

(b) What are the strategies of Aggregate Planning? Explain.8. Explain the different methods available for aggregate planning.

9. Write short notes on: (a) Activities of dispatcher and (b) Aggregate planning

10. (a) List out the guide lines for aggregate scheduling

(b) Explain the different costs associated with aggregate planning

11. (a) Explain forward scheduling and back ward scheduling.(b) List out the guide lines for aggregate scheduling(c) Explain the different costs associated with aggregate planning.

12. Explain:(a) Line balancing(b) Expediting.

13. What is Aggregate Planning? How does it differ from Long range Planning and short period

planning? Explain with an example

14. List out and explain various methods of increasing and decreasing capacity of a plant to

match the demand during Aggregate Planning.

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Assignment Unit v to Unit VII