SCMA Chapter 14
The MPS calls for 50 units of Product A and 60 of B. There are currently 25 of Product B on hand. Each A requires 2 of Part C; each B requires 5 of C. There are 160 units of C available. The net requirements for C are A) 115 B) 175 C) 240 D) 690 E) 700
A) 115
Given the following bill of material Tier 1: A Tier 2: B(1), C(1) Tier 3: D(2), E(1), F(2), D(1), F(1) If the demand for product A is 50 units, what will be the gross requirement for component E? A) 50 B) 100 C) 150 D) 200 E) 300
A) 50
Which of the following best differentiates material requirements planning (MRP) from finite capacity scheduling (FCS)? A) FCS recognizes the finite nature of capacity while MRP does not. B) FCS works in services while MRP does not. C) MRP requires time buckets while FCS does not. D) FCS is an input into traditional MRP systems. E) FCS uses the Wagner-Whitin algorithm while MRP uses lot-for-lot and EOQ.
A) FCS recognizes the finite nature of capacity while MRP does not.
In continuous (stock-to-forecast) operations, the master production schedule is usually expressed in terms of A) end items B) modules C) kits D) customer orders E) warehouse orders
A) end items
By convention, the top level in a bill of material is A) level 0 B) level 1 C) level T D) level 10 E) level 100
A) level 0
What lot-sizing technique is generally preferred when inventory holding costs are extremely high? A) lot-for-lot B) EOQ C) part-period balancing D) the Wagner-Whitin algorithm E) All of the above are appropriate for the situation.
A) lot-for-lot
Which of the following lot-sizing techniques results in the lowest holding costs? A) lot-for-lot B) EOQ C) part-period balancing D) Wagner-Whitin algorithm E) the quantity discount model
A) lot-for-lot
In MRP, system nervousness is caused by A) management's attempt to continually respond to minor changes in production requirements B) the use of the lot-for-lot approach C) management's marking part of the master production schedule as "not to be rescheduled" D) the use of phantom bills of material E) management's attempt to evaluate alternative plans before making a decision
A) management's attempt to continually respond to minor changes in production requirements
The __________ is (are) the MRP input detailing which end items are to be produced, when they are needed, and in what quantities. A) master production schedule B) load report C) inventory records D) assembly time chart E) bill of material
A) master production schedule
Which of the following is not a key benefit of MRP? A) quality increases B) better response times to customer orders C) faster response to market changes D) improved utilization of facilities E) reduced inventory levels
A) quality increases
Which of the following is a step towards integrating JIT and MRP according to the text? A) smaller buckets B) increase quality C) scrap MRP, it does not work with JIT D) migrate from MRP to ERP E) All of the above are acceptable steps
A) smaller buckets
Each R requires 4 of component S; each S requires 3 of part T. The lead time for assembly of R is 1 week. The lead time for the manufacture of S is 2 weeks. The lead time for the procurement of T is 6 weeks. The cumulative lead time for R is __________ weeks. A) 6 B) 9 C) 12 D) 18 E) 28
B) 9
Which of the following statements is true about the MRP plan when using lot-for-lot ordering? A) The quantity of gross requirements for a child item is always equal to the quantity of planned order releases for its parent. B) The quantity of gross requirements for a child item is equal to the quantity of planned order release(s) multiplied by the number of child items used in the parent assembly. C) The quantity of gross requirements for a child item is always equal to the quantity of gross requirements for its parent. D) The quantity and gross requirements for a child item is always equal to the quantity of net requirements for its parent. E) All of the above are true.
B) The quantity of gross requirements for a child item is equal to the quantity of planned order release(s) multiplied by the number of child items used in the parent assembly.
The phrase "demand related to the demand for other products" describes A) a dependent variable B) dependent demand C) recursive demand D) regression analysis E) independent demand
B) dependent demand
A bill of material must be updated with the corrected dimensions of a part. The document that details this change is a(n) A) modular bill B) engineering change notice C) resource requirements profile D) lead time-offset product structure document E) planning bill
B) engineering change notice
The extension of MRP which extends to resources such as labor hours and machine hours, as well as to order entry, purchasing, and direct interface with customers and suppliers is A) MRP II B) enterprise resource planning C) the master production schedule D) closed-loop MRP E) not yet technically possible
B) enterprise resource planning
Firms making many different final products use __________ to facilitate production scheduling. A) planning bills B) modular bills C) phantom bills D) overdue bills E) none of the above
B) modular bills
Each R requires 2 of component S and 1 of part T. The lead time for assembly of R is 3 days. The lead time for the manufacture of S is 5 days. The lead time for the manufacture of T is 10 days. The cumulative lead time for R is __________ days. A) 6 B) 9 C) 13 D) 17 E) cannot be determined
C) 13
The MPS calls for 110 units of Product A. There are currently 60 of Product A on hand. Each A requires 4 of Part B. There are 20 units of B available. The net requirements for B are A) 20 B) 120 C) 180 D) 240 E) 440
C) 180
The MPS calls for 110 units of Product M. There are currently 30 of Product M on hand. Each M requires 4 of Component N. There are 20 units of N on hand. The net requirements for N are A) 150 B) 170 C) 300 D) 320 E) 440
C) 300
Given the following bill of material Tier 1: A Tier 2: B(1), C(1) Tier 3: D(2), E(1), F(2), D(1), F(1) If the demand for product A is 30 units, and there are 10 units of B on hand and none of C, how many units of part D will be needed? A) 3 B) 40 C) 70 D) 90 E) 110
C) 70
Each X requires 2 of component Y; each Y requires 4 of part Z. The lead time for assembly of X is 1 week. The lead time for the manufacture of Y is 1 week. The lead time for the procurement of Z is 6 weeks. The cumulative lead time for X is __________ weeks. A) 6 B) 7 C) 8 D) 10 E) cannot be determined
C) 8
MRP II is accurately described as A) MRP software designed for services B) MRP with a new set of computer programs that execute on microcomputers C) MRP augmented by other resource variables D) an enhancement of MRP that plans for all levels of the supply chain E) a new generation of MRP software that extends MRP to planning and scheduling functions
C) MRP augmented by other resource variables
A bill of material lists the A) times needed to perform all phases of production B) production schedules for all products C) components, ingredients, and materials required to produce an item D) operations required to produce an item E) components, ingredients, materials, and assembly operations required to produce an item
C) components, ingredients, and materials required to produce an item
he following table is an example of a(n) Clothes Washer W2: 200 W4: 100 Clothes Dryer W1: 300; W2: 100, W3: 100, W5: 100 Upright Freezer W3: 200 W4: 500 A) aggregate plan B) load report C) master production schedule D) capacity plan E) inventory record
C) master production schedule
Linking a part requirement with the parent component that caused the requirement is referred to as A) net requirements planning B) a time fence C) pegging D) kanban E) leveling
C) pegging
A firm makes numerous models of mowers, garden tractors, and gasoline powered utility vehicles. Some assemblies and parts are common to many end items. To relieve the MPS of performing order releases on these common parts, the firm might choose to use the __________ technique. A) Wagner-Whitin B) economic part period C) supermarket D) gross material requirements E) resource requirements profile
C) supermarket
A material requirements plan contains information with regard to all of the following except A) quantities and required delivery dates of all subassemblies B) quantities and required delivery dates of final products C) the capacity needed to provide the projected output rate D) inventory on hand for each final product E) inventory on hand for each subassembly
C) the capacity needed to provide the projected output rate
If a load report (resource requirements profile) shows a work center scheduled beyond capacity A) the company must add capacity by enlarging the facility B) the company must add capacity by such tactics as overtime and subcontracting C) the work center's load may be smoothed by such tactics as operations splitting or lot splitting D) the aggregate plan must be revised E) the Wagner-Whitin algorithm should be used to rebalance the load
C) the work center's load may be smoothed by such tactics as operations splitting or lot splitting
One of the tools that is particularly useful in reducing the system nervousness in the MRP system is (are) A) modular bills B) time phasing C) time fences D) lot sizing E) closed loop system
C) time fences
Dependent demand and independent demand items differ in that A) for any product, all components are dependent-demand items B) the need for independent-demand items is forecast C) the need for dependent-demand items is calculated D) All of the above are true. E) None of the above is true.
D) All of the above are true.
An engineering change notice is used to change a(n) A) MRP B) MPS C) ERP D) BOM E) none of the above
D) BOM
Which of the following statements regarding MRP in services is true? A) MRP is for manufacturing only, and is not applicable to services. B) MRP can be used in services, but only those that offer very limited customization. C) MRP does not work in services because there is no dependent demand. D) Services such as restaurant meals illustrate dependent demand, and require product structure trees, bills-of-material, and scheduling. E) None of the above is true.
D) Services such as restaurant meals illustrate dependent demand, and require product structure trees, bills-of-material, and scheduling.
It is week 1 and there are currently 20 As in stock. The MPS calls for 300 As at the start of week 5. If there are scheduled receipts planned for week 3 and week 4 of 120 As each and A has a lead time of 1 week when and how large of an order should be placed to meet the requirement of 300 As? A) Week 1, 300 A s B) Week 1, 40 A s C) Week 5, 40 A s D) Week 4, 40 A s E) Week 4, 300 A s
D) Week 4, 40 A s
Enterprise resource planning (ERP) A) seldom requires software upgrade or enhancement B) does not integrate well with functional areas other than operations C) is inexpensive to implement D) automates and integrates the majority of business processes E) all of the above
D) automates and integrates the majority of business processes
In job shop (make-to-order) operations, the master production schedule is usually expressed in A) end items B) modules C) kits D) customer orders E) warehouse orders
D) customer orders
In MRP record calculations, the appearance of a negative value for the gross requirements of an end item in a specific time bucket A) signals the need to purchase that end item in that period B) implies that value was scheduled by the MPS C) signals the need for a negative planned order receipt in that period D) is impossible E) All of the above are true.
D) is impossible
A document calls for the production of 50 small garden tractors in week 1; 50 small garden tractors and 100 riding mowers in week 2; 100 riding mowers and 200 garden utility carts in week 3; and 100 riding mowers in week 4. This document is most likely a(n) A) net requirements document B) resource requirements profile C) aggregate plan D) master production schedule E) Wagner-Whitin finite capacity document
D) master production schedule
Which portion of the master production schedule is normally fixed, frozen, or firm? A) the entire schedule B) only the aggregate schedule C) only the middle of the schedule D) only the near-term portion E) only the far-term portion
D) only the near-term portion
In MRP, the number of units projected to be available at the beginning of each time period refers to A) net requirements B) scheduled receipts C) the projected usage of the item D) the amount projected to be on hand E) the amount necessary to cover a shortage
D) the amount projected to be on hand
Demand for a given item is said to be dependent if A) it originates from the external customer B) there is a deep bill of material C) the finished products are mostly services (rather than goods) D) there is a clearly identifiable parent E) the item has several children
D) there is a clearly identifiable parent
An item's holding cost is 60 cents per week. Each setup costs $120. Lead time is 2 weeks. EPP is A) .005 B) 60 C) 72 D) 100 E) 200
E) 200
Given the following bill of material Tier 1: A Tier 2: B(2), C(3), D(1) Tier 3: C(1), D(1), D(1), E(2), F(1), G(2) If the demand for product A is 50 units, what will be the gross requirement for component E? A) 4 B) 100 C) 200 D) 250 E) 300
E) 300
The minimum record accuracy required for successful MRP is approximately A) lower than 90% B) 90% C) 95% D) 97% E) 99%
E) 99%
A grill assembly takes 20 washers. Instead of listing these washers separately they are grouped into a single kit for production. The bill of material for the washers is classified as A) "Pseudo" B) Planning C) Modular D) Low-level E) A and B
E) A and B
Distortion in MRP systems can be minimized when safety stock is held at the A) purchased component or raw material level B) work-in-process level C) finished goods level D) A and B E) A and C
E) A and C
Capacity planning in closed-loop MRP A) utilizes feedback about workload from each work center B) may make use of resource requirements profiles (load reports) C) may smooth work center loads with such tactics as overlapping and lot splitting D) does not add capacity, but rather seeks effective use of existing capacity E) All of the above are true.
E) All of the above are true.
Which of the following statements regarding the gross material requirements plan is true? A) It shows total demand for an item. B) It shows when an item must be ordered from a supplier or when production must be started. C) It combines a master production schedule with the time-phased schedule. D) It requires several inputs, including an accurate bill of material. E) All of the above are true.
E) All of the above are true.
Which of the following statements best compares modular bills and phantom bills? A) Both pertain to assemblies that are not inventoried. B) There is no difference between the two. C) Both pertain to assemblies that are inventoried. D) Modular bills are used for assemblies that are not inventoried, unlike phantom bills. E) Modular bills represent subassemblies that actually exist and are inventoried, while phantom bills represent subassemblies that exist only temporarily and are not inventoried.
E) Modular bills represent subassemblies that actually exist and are inventoried, while phantom bills represent subassemblies that exist only temporarily and are not inventoried.
The aggregate plan gets input or feedback from which of the following areas? A) engineering B) finance, marketing, and human resources C) the master production schedule D) procurement, production, and general management E) all of the above
E) all of the above
The bill of material contains information necessary to A) place an order to replenish the item B) calculate quantities on hand and on order C) convert net requirements into higher level gross requirements D) convert gross requirements into net requirements E) convert (explode) net requirements at one level into gross requirements at the next level
E) convert (explode) net requirements at one level into gross requirements at the next level
If safety stock is desired it should be built into which portion of MRP? A) any B) none C) raw materials D) finished assemblies E) either C or D
E) either C or D
The Wagner-Whitin algorithm is the most widely used MRP lot-sizing technique.
FALSE
The economic part period is a fraction of a time bucket.
FALSE
The master production schedule is a forecast of demand for families of products.
FALSE
A bill of material lists all components, ingredients, and materials needed to produce one unit of an end item.
TRUE
Closed-loop MRP systems allow production planners to move work between time periods to smooth the load or to at least bring it within capacity.
TRUE
DRP is a time-phased stock-replenishment plan for all levels of a distribution network.
TRUE
Finite capacity scheduling, unlike MRP, recognizes the capacity limitations of departments and machines when building schedules.
TRUE
Firms may discover that, rather than adapting ERP to the way they do business, they have to adapt the way they do business to accommodate the ERP software.
TRUE
Gross material requirements do not take into account the amount of inventory on hand.
TRUE
If 100 units of Q are needed and 10 are already in stock, then the gross requirement is 100 and the net requirement is 90.
TRUE
If X consists of one A and one B, and each A consists of one F and two Gs, then A is the "parent" component of G.
TRUE
The quantity required of a dependent demand item is computed from the demand for the final products in which the item is used.
TRUE
The supply-chain systems that result from using ERP in the grocery industry are called efficient consumer response (ECR) systems.
TRUE
The time-phased product structure, unlike the bill of material, adds the concept of lead times.
TRUE
Time fences divide that segment of the MPS that can be revised from that section that is "frozen."
TRUE
Wheeled Coach obtains competitive advantage through MRP in part because of their excellent record integrity and insistence on record accuracy.
TRUE
Which of the following best describes a gross material requirements plan? A) a schedule that shows total demand for an item, and when it must be ordered from a supplier or when production must be started B) an intermediate range plan for the scheduling of families of products C) a chart illustrating whether capacity has been exceeded D) a table that corrects scheduled quantities for inventory on hand E) a schedule showing which products are to be manufactured and in what quantities
A) a schedule that shows total demand for an item, and when it must be ordered from a supplier or when production must be started
Which of the following statements regarding lot-sizing is true? A) EOQ principles should be followed whenever economical. B) Too much concern with lot-sizing results in false accuracy. C) Lot-for-lot cannot be modified for scrap allowance or process constraints. D) The Wagner-Whitin algorithm simplifies lot size calculations. E) All of the above are true.
B) Too much concern with lot-sizing results in false accuracy.
Distribution resource planning (DRP) is A) a transportation plan to ship materials to warehouses B) a time-phased stock replenishment plan for all levels of a distribution network C) a shipping plan from a central warehouse to retail warehouses D) material requirements planning with feedback loop from distribution centers E) a material requirements planning package used exclusively by warehouses
B) a time-phased stock replenishment plan for all levels of a distribution network
A master production schedule contains information about A) quantities and required delivery dates of all subassemblies B) quantities and required delivery dates of final products C) inventory on hand for each subassembly D) inventory on hand for each final product E) scheduled receipts for each final product
B) quantities and required delivery dates of final products
For the lot-sizing technique known as lot-for-lot to be appropriate A) future demand should be known for several weeks B) setup cost should be relatively small C) annual volume should be rather low D) item unit cost should be relatively small E) the independent demand rate should be very stable
B) setup cost should be relatively small
Material requirements plans specify A) the quantities of the product families that need to be produced B) the quantity and timing of planned order releases C) the capacity needed to provide the projected output rate D) the costs associated with alternative plans E) whether one should use phantom bills of material or not
B) the quantity and timing of planned order releases
A paint company mixes ten different base colors into 3,000 different color options. If the MPS is organized around the ten different base colors their bills of material are classified as A) Phantom B) Planning C) Modular D) Low-Level E) A and B
C) Modular
When safety stock is deemed absolutely necessary, the usual policy is to build it into which category of the MRP logic? A) Gross Requirements B) Scheduled Receipts C) Projected On Hand D) Net Requirements E) Planned Order Receipts
C) Projected On Hand
Which of the following statements regarding Wheeled Coach is false? A) Wheeled Coach has found competitive advantage through MRP. B) Wheeled Coach builds ambulances in a repetitive process. C) Wheeled Coach's MRP system allowed the company to meet tight schedules, but caused inventory to rise. D) Wheeled Coach's MRP system maintains excellent record integrity. E) Low inventory and high quality are two positive outcomes of Wheeled Coach's use of MRP.
C) Wheeled Coach's MRP system allowed the company to meet tight schedules, but caused inventory to rise.
Low level coding means that A) a final item has only a few levels in the BOM structure B) it is the code for the lowest level in the BOM structure C) a component item is coded at the lowest level at which it appears in the BOM structure D) the top level of the BOM is below level zero and that BOMs are not organized around the finished product E) none of the above
C) a component item is coded at the lowest level at which it appears in the BOM structure
A master production schedule specifies A) the raw materials required to complete the product B) what component is to be made, and when C) what product is to be made, and when D) the labor hours required for production E) the financial resources required for production
C) what product is to be made, and when
Effective use of MRP and other dependent demand models does not require which of the following? A) master production schedule B) bill of materials C) inventory availability D) lead times E) cost of individual components
E) cost of individual components
Wheeled Coach insists all of the following tasks are key to successful MRP use except A) materials plan must meet both schedule requirements and facility capabilities B) plan must be executed as designed C) inventory investment must be minimized D) excellent record integrity must be maintained E) stringent quality control
E) stringent quality control
"Phantom bills" are bills of material for subassemblies that do not exist in reality.
FALSE
A dependent demand item is so called because its demand is dependent on customer preferences.
FALSE
By convention, the top level in a bill of material is designated level 1.
FALSE
In MRP, a "bucket" refers to a fixed order quantity, such as an EOQ.
FALSE
MRP can be effective only if very accurate lot sizes are calculated in advance.
FALSE
MRP is an excellent tool for scheduling products with variable lead times.
FALSE
Operations splitting sends pieces to the next operation before the entire lot is completed on the previous operation.
FALSE
Since MRP is quite detailed in nature, it has no influence on the longer-range, less detailed aggregate planning.
FALSE
The Aggregate Plan, derived from the Master Production Schedule, specifies in more detail how much of which products is to be made at what times.
FALSE
If parts and subassemblies common to a variety of products are managed through the supermarket concept, formal order releases for such parts are not necessary.
TRUE
In general, the lot-for-lot approach should be used whenever economical.
TRUE
Lead times, inventory availability, and purchase orders outstanding are among the five things operations managers must know for effective use of MRP.
TRUE
MRP is generally practiced on items with dependent demand.
TRUE
Planning bills of material are bills of material for "kits" of inexpensive items such as washers, nuts, and bolts.
TRUE
Reduced inventory levels and faster response to market changes are both benefits of MRP.
TRUE
Smoothing a resource requirements profile to stay within capacity limits may increase setup costs.
TRUE
The lot-for-lot lot-sizing technique is particularly appropriate when demand is not very smooth and set up cost is small compared to holding cost.
TRUE
When safety stock is deemed absolutely necessary, the usual policy is to build it into the projected on-hand inventory of the MRP logic.
TRUE
While ERP may provide a strategic advantage over competitors, it is so complex that many companies cannot adjust to it.
TRUE
