4362

Which of the following is an assumption commonly made in using MRP lot-sizing procedures?

A) Component requirements are aggregated by time period for planning purposes, so all requirements for each period must be available at the beginning of the period. B) All requirements for future periods must be met and cannot be back ordered. C) The requirements are properly offset for manufacturing lead times. D) All of the options are assumptions commonly made in using MRP lot-sizing procedures.

Which of the following statements is correct?

A) Net requirements created by MRP explosion over a multi-period horizon do not reflect the key independent demand assumption of a constant uniform demand. B) Net requirements created by MRP explosion over a multi-period horizon are discrete, because they are stated on a period-by-period basis (time-phased), rather than as a rate. C) Net requirements created by MRP explosion over a multi-period horizon can be lumpy; that is, they can vary substantially from period to period and even have periods with no requirements. D) All of the statements are correct.

The prime objective of PAC is:

Executing MPC plans

A CR (Critical ratio) > 1 of a job implies that the job is already late.

False

At any time, if a set of n jobs is to be scheduled on m machines, there are (n*m) ways to schedule the jobs.

False

In MRP, the only source of uncertainty is supply.

False

In a single machine job shop, the makespan depends on the rule used for scheduling.

False

Johnson's rule when applied in a two-machine case will provide minimum average lateness.

False

KBB will provide the minimum total cost only if the net requirements in MRP are lumpy.

False

Which one of the following lot-sizing rules guarantees an optimal solution when demand is constant?

KBB & EOQ

The lowest planning and control level in MPC

PAC

One way of dealing with the shop-floor complexity is by

Priority sequencing rules

Examining realistic, multiple-machine, dynamic scheduling situations is possible by using

Simulation

Sequencing rules are used to establish

The priorities for the jobs in a queue waiting to be processed at a work center

A critical information service provided by MRP is apprising the SFC systems of all changes in material plans

True

A small change caused by a relatively minor shift in the MPS may amplify the explosion process and use of the discrete lot-sizing procedures.

True

The lot-sizing procedure used for a parent part in an MRP system has a direct impact on the gross requirements data passed to its component parts.

True

The quantities and timings for planned order releases are determined via MRP logic using the inventory records, the gross requirements data, and a quantity-determination (lot-sizing) procedure.

True

Safety stock and safety lead-time are mechanisms to cope with

a.demand uncertainty. b.lead time uncertainty. c.supply uncertainty. d.all the options are valid.

Which of the following statements is correct about complete enumeration?

all possible alternatives are evaluated and compared to pick the best solution.

The lot-for-lot (L4L) procedure

creates order quantities that are exactly equal to net requirements.