THE ULTIMATE OPMA 3306 EXAM
CRACKER 200 QUESTIONS ANSWERS
AND DETAILED RATIONALES
OPMA 3306 Operations Management Practice Final
1. Which of the following best describes the "Bullwhip Effect" in a
supply chain?
A. The reduction of costs as volume increases.
B. The distortion of demand information as it moves upstream
from the retailer to the manufacturer.
C. The speed at which a product moves through a factory.
D. The process of outsourcing non-core competencies.
Answer: B
Rationale: The bullwhip effect occurs when small fluctuations in
consumer demand lead to progressively larger fluctuations in
orders placed by wholesalers and manufacturers.
2. In the Economic Order Quantity (EOQ) model, what happens
to the optimal order quantity if the annual demand doubles while
all other factors remain constant?
A. The EOQ doubles.
B. The EOQ remains the same.
C. The EOQ increases by approximately 41% (the square root of 2).
D. The EOQ decreases by half.
Answer: C
Rationale: The EOQ formula involves the square root of demand
(\(\sqrt{2DS/H}\)). If D doubles, the result is \(\sqrt{2}\) times
the original EOQ.
3. In a Critical Path Method (CPM) network, "Slack" (or Float) is
defined as:
A. The total duration of the project.
B. The amount of time an activity can be delayed without delaying
the project completion date.
C. The time difference between the Early Start and the Early
Finish.
D. The cost associated with crashing a project.
Answer: B
, Rationale: Slack is calculated as (Late Start - Early Start) or
(Late Finish - Early Finish). Critical path activities always have
zero slack.
4. Which of the following is a key characteristic of a Process-
Focused (Job Shop) facility?
A. High volume and low variety.
B. Highly standardized products.
C. Low volume and high variety of products.
D. Continuous flow of materials.
Answer: C
Rationale: Process-focused facilities are organized around
specific activities (like a machine shop) and are designed to
handle custom or low-volume orders.
5. When using a p-chart for Statistical Process Control, what are we
primarily measuring?
A. The weight of an item.
B. The number of defects per unit.
C. The proportion of defective items in a sample.
D. The range of measurements in a subgroup.
Answer: C
Rationale: P-charts are attribute control charts used specifically
to track the percentage or proportion of non-conforming
(defective) items.
6. What is the primary goal of Six Sigma quality management?
A. To increase the speed of the assembly line.
B. To reduce process variation so that the defect rate is extremely
low (3.4 per million).
C. To eliminate the need for inventory.
D. To outsource all manufacturing to lower-cost regions.
Answer: B
Rationale: Six Sigma focuses on process capability and reducing
variability to ensure high consistency and quality.
7. In Linear Programming, what does the "Shadow Price"
represent?
A. The cost of a product in the black market.
B. The amount the objective function value would change given a
one-unit increase in a constraint's right-hand side.
C. The price of a product after a discount.
, D. The cost of labor in a different country.
Answer: B
Rationale: Shadow prices indicate the marginal value of an
additional unit of a limited resource.
8. Which inventory classification (ABC Analysis) typically represents
the top 15-20% of items that account for 70-80% of the total
annual dollar usage?
A. Class A
B. Class B
C. Class C
D. Class D
Answer: A
Rationale: Class A items are the most critical "vital few" that
require the tightest inventory control and most frequent review.
9. Just-In-Time (JIT) systems view inventory as:
A. A safety net against supplier failure.
B. An asset that should be maximized.
C. Waste (Muda) that hides underlying process problems.
D. A necessary requirement for all business models.
Answer: C
Rationale: JIT philosophy emphasizes reducing inventory to
expose inefficiencies, defects, and bottlenecks.
10. In a Project Crashing scenario, which activity should be
crashed first to reduce the project duration?
A. The activity with the highest cost.
B. The activity on the critical path with the lowest marginal crash
cost.
C. The activity with the most slack.
D. The last activity in the project network.
Answer: B
Rationale: To reduce project time at minimum cost, you must
choose a critical activity (so the end date actually moves) with the
cheapest cost to accelerate.
11. In the Theory of Constraints (TOC), what is the primary
recommendation for managing a bottleneck?
A. Increase the capacity of non-bottleneck stations.
B. Ensure the bottleneck is never idle and work flows through it
constantly.
, C. Add more inventory at the end of the production line.
D. Reduce the wages of workers at the bottleneck station.
Answer: B
Rationale: Because the bottleneck limits the output of the entire
system, an hour lost at the bottleneck is an hour lost for the whole
factory.
12.Which of the following describes a Product-Focused (Line)
layout?
A. A high-variety, low-volume "job shop" environment.
B. An arrangement based on the sequence of operations for a
standardized, high-volume product.
C. A fixed position where the product remains stationary (e.g.,
shipbuilding).
D. A warehouse with no specific organizational structure.
Answer: B
Rationale: Product layouts, like assembly lines, are designed for
efficiency and speed when producing large quantities of identical
items.
13.What is the main disadvantage of a Moving Average forecast?
A. It is too mathematically complex for most computers.
B. It cannot handle seasonal data or trends effectively; it always
lags behind.
C. It requires qualitative data from external experts.
D. It only works for service industries, not manufacturing.
Answer: B
Rationale: Moving averages smooth out fluctuations but struggle
to predict sudden upward or downward shifts because they rely
on historical means.
14.In a Fixed-Period (P) Inventory System, when are orders
placed?
A. Whenever the inventory level hits a specific reorder point.
B. At regular, pre-set time intervals (e.g., every Monday).
C. Only when the warehouse is completely empty.
D. When a customer places a large order.
Answer: B
Rationale: Unlike Fixed-Quantity (Q) systems, P-systems check
inventory and place orders on a fixed schedule, regardless of how
much was used.
CRACKER 200 QUESTIONS ANSWERS
AND DETAILED RATIONALES
OPMA 3306 Operations Management Practice Final
1. Which of the following best describes the "Bullwhip Effect" in a
supply chain?
A. The reduction of costs as volume increases.
B. The distortion of demand information as it moves upstream
from the retailer to the manufacturer.
C. The speed at which a product moves through a factory.
D. The process of outsourcing non-core competencies.
Answer: B
Rationale: The bullwhip effect occurs when small fluctuations in
consumer demand lead to progressively larger fluctuations in
orders placed by wholesalers and manufacturers.
2. In the Economic Order Quantity (EOQ) model, what happens
to the optimal order quantity if the annual demand doubles while
all other factors remain constant?
A. The EOQ doubles.
B. The EOQ remains the same.
C. The EOQ increases by approximately 41% (the square root of 2).
D. The EOQ decreases by half.
Answer: C
Rationale: The EOQ formula involves the square root of demand
(\(\sqrt{2DS/H}\)). If D doubles, the result is \(\sqrt{2}\) times
the original EOQ.
3. In a Critical Path Method (CPM) network, "Slack" (or Float) is
defined as:
A. The total duration of the project.
B. The amount of time an activity can be delayed without delaying
the project completion date.
C. The time difference between the Early Start and the Early
Finish.
D. The cost associated with crashing a project.
Answer: B
, Rationale: Slack is calculated as (Late Start - Early Start) or
(Late Finish - Early Finish). Critical path activities always have
zero slack.
4. Which of the following is a key characteristic of a Process-
Focused (Job Shop) facility?
A. High volume and low variety.
B. Highly standardized products.
C. Low volume and high variety of products.
D. Continuous flow of materials.
Answer: C
Rationale: Process-focused facilities are organized around
specific activities (like a machine shop) and are designed to
handle custom or low-volume orders.
5. When using a p-chart for Statistical Process Control, what are we
primarily measuring?
A. The weight of an item.
B. The number of defects per unit.
C. The proportion of defective items in a sample.
D. The range of measurements in a subgroup.
Answer: C
Rationale: P-charts are attribute control charts used specifically
to track the percentage or proportion of non-conforming
(defective) items.
6. What is the primary goal of Six Sigma quality management?
A. To increase the speed of the assembly line.
B. To reduce process variation so that the defect rate is extremely
low (3.4 per million).
C. To eliminate the need for inventory.
D. To outsource all manufacturing to lower-cost regions.
Answer: B
Rationale: Six Sigma focuses on process capability and reducing
variability to ensure high consistency and quality.
7. In Linear Programming, what does the "Shadow Price"
represent?
A. The cost of a product in the black market.
B. The amount the objective function value would change given a
one-unit increase in a constraint's right-hand side.
C. The price of a product after a discount.
, D. The cost of labor in a different country.
Answer: B
Rationale: Shadow prices indicate the marginal value of an
additional unit of a limited resource.
8. Which inventory classification (ABC Analysis) typically represents
the top 15-20% of items that account for 70-80% of the total
annual dollar usage?
A. Class A
B. Class B
C. Class C
D. Class D
Answer: A
Rationale: Class A items are the most critical "vital few" that
require the tightest inventory control and most frequent review.
9. Just-In-Time (JIT) systems view inventory as:
A. A safety net against supplier failure.
B. An asset that should be maximized.
C. Waste (Muda) that hides underlying process problems.
D. A necessary requirement for all business models.
Answer: C
Rationale: JIT philosophy emphasizes reducing inventory to
expose inefficiencies, defects, and bottlenecks.
10. In a Project Crashing scenario, which activity should be
crashed first to reduce the project duration?
A. The activity with the highest cost.
B. The activity on the critical path with the lowest marginal crash
cost.
C. The activity with the most slack.
D. The last activity in the project network.
Answer: B
Rationale: To reduce project time at minimum cost, you must
choose a critical activity (so the end date actually moves) with the
cheapest cost to accelerate.
11. In the Theory of Constraints (TOC), what is the primary
recommendation for managing a bottleneck?
A. Increase the capacity of non-bottleneck stations.
B. Ensure the bottleneck is never idle and work flows through it
constantly.
, C. Add more inventory at the end of the production line.
D. Reduce the wages of workers at the bottleneck station.
Answer: B
Rationale: Because the bottleneck limits the output of the entire
system, an hour lost at the bottleneck is an hour lost for the whole
factory.
12.Which of the following describes a Product-Focused (Line)
layout?
A. A high-variety, low-volume "job shop" environment.
B. An arrangement based on the sequence of operations for a
standardized, high-volume product.
C. A fixed position where the product remains stationary (e.g.,
shipbuilding).
D. A warehouse with no specific organizational structure.
Answer: B
Rationale: Product layouts, like assembly lines, are designed for
efficiency and speed when producing large quantities of identical
items.
13.What is the main disadvantage of a Moving Average forecast?
A. It is too mathematically complex for most computers.
B. It cannot handle seasonal data or trends effectively; it always
lags behind.
C. It requires qualitative data from external experts.
D. It only works for service industries, not manufacturing.
Answer: B
Rationale: Moving averages smooth out fluctuations but struggle
to predict sudden upward or downward shifts because they rely
on historical means.
14.In a Fixed-Period (P) Inventory System, when are orders
placed?
A. Whenever the inventory level hits a specific reorder point.
B. At regular, pre-set time intervals (e.g., every Monday).
C. Only when the warehouse is completely empty.
D. When a customer places a large order.
Answer: B
Rationale: Unlike Fixed-Quantity (Q) systems, P-systems check
inventory and place orders on a fixed schedule, regardless of how
much was used.
