Student: Cycle Time
Student Name:
Model Answer
Student ID:
IE 472 – Operations of Manufacturing Systems
Midterm, Fall 08/09
1) State true or false for each of the following statements
( T ) In the EOQ model, the sum of holding and setup costs is fairly insensitive to the order quantity.
(
F ) The Wagner-Whitin algorithm is based on the property that the inventory carried to period t + 1 will always be less than that of period t
( F ) Zero cycle time is one of the main targets of JIT.
( T ) With cross-training and autonomation, it becomes possible for a single worker to operate several machines at once.
(
F ) The classical Kanban system made use of three types of cards: a production card, a move card and a sequencing card.
(
F ) In MRP, pegging is the reverse action of netting.
( T ) Nervousness in MRP occurs when a small change in the master production schedule results in a large change in planned order releases.
(
F ) The JIT’s target of zero-inventory can not be achieved in systems that utilize MRP.
( T ) Practically, increasing throughput must be accompanied with increasing the level of WIP as long as the bottleneck rate is not reached.
( F ) The bottleneck station is identified as the one that has the lowest utilization. (
F ) Increasing the number of parallel machines in a non-bottleneck workstation reduces the cycle time.
( F ) In a balanced production line, cycle time becomes the inverse of the throughput at WIP levels greater than the critical WIP.
( F ) The higher the practical worst case cycle time is, the better the production line will be.
(
F ) In the lean philosophy, “muda” can be achieved by performing “kaizen” events. 2) The product structure trees for products A and F are shown below. Part of the master production schedule showing when the company will complete production operations for quantities of these products is shown in the table below. Find the gross requirements for item B throughout
Model Answer
Student ID:
IE 472 – Operations of Manufacturing Systems
Midterm, Fall 08/09
1) State true or false for each of the following statements
( T ) In the EOQ model, the sum of holding and setup costs is fairly insensitive to the order quantity.
(
F ) The Wagner-Whitin algorithm is based on the property that the inventory carried to period t + 1 will always be less than that of period t
( F ) Zero cycle time is one of the main targets of JIT.
( T ) With cross-training and autonomation, it becomes possible for a single worker to operate several machines at once.
(
F ) The classical Kanban system made use of three types of cards: a production card, a move card and a sequencing card.
(
F ) In MRP, pegging is the reverse action of netting.
( T ) Nervousness in MRP occurs when a small change in the master production schedule results in a large change in planned order releases.
(
F ) The JIT’s target of zero-inventory can not be achieved in systems that utilize MRP.
( T ) Practically, increasing throughput must be accompanied with increasing the level of WIP as long as the bottleneck rate is not reached.
( F ) The bottleneck station is identified as the one that has the lowest utilization. (
F ) Increasing the number of parallel machines in a non-bottleneck workstation reduces the cycle time.
( F ) In a balanced production line, cycle time becomes the inverse of the throughput at WIP levels greater than the critical WIP.
( F ) The higher the practical worst case cycle time is, the better the production line will be.
(
F ) In the lean philosophy, “muda” can be achieved by performing “kaizen” events. 2) The product structure trees for products A and F are shown below. Part of the master production schedule showing when the company will complete production operations for quantities of these products is shown in the table below. Find the gross requirements for item B throughout