Question Paper: Production Planning And Control Question Paper - May 18 - Mechanical Engineering (Semester 7) - Mumbai University (MU)

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## Production Planning And Control - May 18

### Mechanical Engineering (Semester 7)

Total marks: 80

Total time: 3 Hours
INSTRUCTIONS

(1) Question 1 is compulsory.

(2) Attempt any **three** from the remaining questions.

(3) Draw neat diagrams wherever necessary.

**Answer an four**

**1.a.**Functions of PPC

**1.b.**Work Orders

**1.c.**JIT and MRP

**1.d.**Computer aided process planning

**1.e.**Forecasting Error and Forecasting Bias

**1.f.**Factors influencing scheduling

**2.a.**Explain in details the pre-requisites of the PPC in the form of various types of data

**2.b.**Annual requirement of an item is 2400 units. Each item costs the company Rs. 6/unit. the manufacturer offers discount of 5% if 500 or more quantities are purchased. The ordering cost is rs. 32/ order and inventory cost is 16%. Whether it is advisable to accept the discount?

Comment.

**3.a.**For the given demand pattern, Estimate the sales forecast for the year 2018, using exponential smoothing forecaster. Take $\alpha=0.5$ and the forecasts for the year 2013 as 180 units. Compare the forecast with least square method.

Year | 2013 | 2014 | 2015 | 2016 | 2017 |
---|---|---|---|---|---|

Demand | 200 | 188 | 179 | 190 | 208 |

**3.b.**What do you understand by

**3.b.i.** Safety Stock

**3.b.ii.** Instantaneous Stock replenishment

**3.b.iii.** Recorder Level

**3.b.iv.** Lead Time

**3.b.v.** Economic Order Quantity

**4.a.**Explain the linkage of Product Planning with Process Planning and describe the various steps involved in making a process plan

**4.b.**Four different jobs can be made on four different machines. The set up and take down costs are assumed to be prohibitively high for changeovers. The matrix below gives the cost in rupees of producing Job

*I*on Machine

*J*

How should the jobs be assigned to the various machines so that the total cost is minimized?

**5.a.**Construct the network for the following activities . The three time estimates for activities are given; calculate the Estimated Time for activities. Determine the critical path. What is the probability that the project will be completed in 20 days?

Activities | To | Tm | Tp |
---|---|---|---|

1-2 | 2 | 2 | 8 |

2-3 | 1 | 1.5 | 11 |

2-4 | 0.5 | 1 | 7.5 |

3-4 | 0 | 0 | 0 |

3-5 | 1 | 2.5 | 7 |

4-5 | 6 | 7 | 8 |

3-6 | 1 | 2 | 3 |

4-6 | 3 | 4 | 11 |

5-6 | 4 | 6 | 8 |

**5.b.**Explain the following

**5.b.i.** Difference between PERT and CPM

**5.b.ii.** Types of Floats and their calculations

**6.a.**What are the principle functions of Dispatching? What are the documents generally prepared while performing Dispatching function?

**6.b.**The utility data for a network is given below. Crash the network to minimum project duration and determine the project cost for that duration.