Types of Acceptance Sampling Plans: A Comprehensive Guide for Industrial Engineering Students

Question 1

Which acceptance sampling plan inspects only one batch of items?

Accepted Answer

Single Sampling Plan

Answer

Double Sampling Plan

Answer

Multiple Sampling Plan

Question 2

How does the OC curve help us evaluate the likelihood of accepting a lot with a specific quality level?

Accepted Answer

It graphically shows the probability of acceptance at different quality levels.

Answer

It determines the ideal sample size for a desired confidence level.

Answer

It calculates the risks for both the producer and the consumer.

Answer

It sets the acceptance criteria for a given sampling plan.

Question 3

Which of the following best describes a single sampling plan?

Accepted Answer

Relies on a single sample to decide whether to accept or reject a lot

Answer

Involves multiple inspections of the same lot to make a decision

Answer

Requires a very large sample size to ensure accuracy

Answer

Has a higher probability of accepting a nonconforming lot compared to other plans

Question 4

What is the primary objective of an acceptance sampling plan?

Accepted Answer

To make a decision about the acceptance or rejection of a lot based on a sample

Answer

To inspect every item in a lot before making a decision

Answer

To ensure that all defective items are identified and removed

Answer

To determine the exact quality level of a production process

Question 5

Which key advantage do multiple sampling plans offer over single sampling plans?

Accepted Answer

They allow for the sample size to be adjusted during the inspection process

Answer

They have a smaller sample size requirement

Answer

They provide greater precision in decision-making

Answer

They are less expensive to implement

Question 6

What does the OC curve in acceptance sampling represent?

Accepted Answer

The relationship between lot quality levels and the probability of acceptance

Answer

A set of instructions for conducting the sampling inspection

Answer

The formula for calculating the probability of accepting a nonconforming lot

Answer

The plot that shows the relationship between sample size and lot size

Question 7

What is the distinction between producer's risk and consumer's risk in acceptance sampling?

Accepted Answer

Producer's risk is the risk of rejecting a good lot, while consumer's risk is the risk of accepting a bad lot

Answer

Consumer's risk is the risk of rejecting a good lot, while producer's risk is the risk of accepting a bad lot

Answer

Producer's risk is always higher than consumer's risk

Answer

Consumer's risk is always higher than producer's risk

Question 8

What is a potential limitation of acceptance sampling?

Accepted Answer

It can lead to incorrect acceptance or rejection decisions

Answer

It requires highly trained inspectors to conduct the inspection

Answer

It can be time-consuming and expensive to implement

Answer

It cannot be used for testing that involves destroying the item being inspected

Question 9

Which essential element characterizes a double sampling plan?

Accepted Answer

Two sample sizes and two sets of acceptance criteria

Answer

Three sample sizes and three sets of acceptance criteria

Answer

Four sample sizes and four sets of acceptance criteria

Answer

Five sample sizes and five sets of acceptance criteria

Question 10

What is the primary advantage of using a multiple sampling plan compared to a single sampling plan?

Accepted Answer

Increased flexibility in decision-making

Answer

Reduced sample size requirement

Answer

Improved accuracy in lot evaluation

Answer

Lower inspection costs

Question 11

How does enlarging the sample size in an acceptance sampling plan influence the total inspection cost?

Accepted Answer

Raises inspection cost due to more items being examined

Answer

Lowers inspection cost as fewer items require examination

Answer

Has no effect on inspection cost as the sample size is fixed

Answer

Reduces inspection cost as fewer items are rejected

Question 12

How does increasing the sample size affect the OC curve of an acceptance sampling plan?

Accepted Answer

Shifts the curve right, increasing the probability of accepting good lots.

Answer

Shifts the curve left, increasing the probability of rejecting good lots.

Answer

Makes the curve steeper, reducing the plan's discrimination power.

Question 13

What does the operating characteristic (OC) curve represent in acceptance sampling?

Accepted Answer

Probability of accepting a lot based on its true quality level

Answer

Probability of rejecting a lot based on its true quality level

Answer

Average sample size needed for decision-making

Question 14

What is the primary purpose of consumer's risk in acceptance sampling?

Accepted Answer

Protecting consumers from accepting low-quality lots

Answer

Protecting producers from rejecting high-quality lots

Answer

Ensuring adequate sample size for reliable decisions

Question 15

In single sampling, the acceptance number defines the:

Accepted Answer

Maximum allowable nonconforming units in a sample for lot acceptance

Answer

Minimum number of nonconforming units in a sample for lot rejection

Answer

Sample size required for a reliable decision

Question 16

When is a double sampling plan advantageous compared to a single sampling plan?

Accepted Answer

When the true quality level is moderate

Answer

When the true quality level is very high

Answer

When the true quality level is very low

Question 17

Which type of acceptance sampling inspection involves examining a sample from each lot?

Accepted Answer

Lot-by-lot inspection

Answer

Continuous inspection

Answer

Skip-lot inspection

Question 18

Which of the following is NOT a relevant factor in selecting an acceptance sampling plan?

Accepted Answer

Product appearance

Answer

Sampling cost

Answer

Inspection reliability

Question 19

Is acceptance sampling applicable solely to manufacturing processes?

Accepted Answer

No

Answer

Yes

Question 20

Which of the following is NOT a type of acceptance sampling plan?

Accepted Answer

Continuous sampling

Answer

Sequential sampling

Answer

Double sampling

Answer

Multiple sampling

Question 21

Which type of acceptance sampling plan is typically used when the lot size is small?

Accepted Answer

Single sampling

Answer

Double sampling

Answer

Sequential sampling

Answer

Multiple sampling

Question 22

What is the primary purpose of an acceptance sampling plan?

Accepted Answer

To make decisions about the acceptance or rejection of a lot based on a sample

Answer

To estimate the quality of a lot

Answer

To control the quality of a process

Question 23

What is the key difference between a single sampling plan and a double sampling plan?

Accepted Answer

A double sampling plan involves taking two samples from a lot, while a single sampling plan involves taking only one sample.

Answer

A single sampling plan is more accurate than a double sampling plan.

Question 24

What does the OC curve of an acceptance sampling plan represent?

Accepted Answer

The probability of accepting a lot as a function of the lot quality

Answer

The average sample size as a function of the lot quality

Answer

The probability of rejecting a lot as a function of the lot quality

Question 25

What is the AQL of an acceptance sampling plan?

Accepted Answer

The quality level that the plan is designed to accept with a high probability

Answer

The average quality level of the lots that the plan will be used to inspect

Answer

The quality level that the plan is designed to reject with a high probability

Question 26

What is the LTPD of an acceptance sampling plan?

Accepted Answer

The quality level that the plan is designed to reject with a low probability

Answer

The average quality level of the lots that the plan will be used to inspect

Answer

The quality level that the plan is designed to accept with a low probability

Question 27

Which acceptance sampling plan involves making a decision about a lot based on the inspection of a single sample?

Accepted Answer

Single sampling plan

Answer

Double sampling plan

Answer

Multiple sampling plan

Answer

Sequential sampling plan

Question 28

A company receives a shipment of 10,000 screws. They decide to inspect 80 screws and accept the lot if no more than 3 are defective. What type of sampling plan is this?

Accepted Answer

Single sampling plan

Answer

Double sampling plan

Answer

Continuous sampling plan

Answer

Multiple sampling plan

Question 29

In a double sampling plan, when is a second sample drawn?

Accepted Answer

When the results of the first sample are inconclusive.

Answer

Only when the first sample leads to lot rejection.

Answer

Always, regardless of the first sample's results.

Question 30

Which of the following is a potential advantage of using a multiple sampling plan over a single sampling plan?

Accepted Answer

It can potentially reduce the total number of items inspected.

Answer

It always requires inspecting fewer items than single sampling.

Answer

It eliminates the risk of accepting bad lots.

Question 31

What does the Operating Characteristic (OC) curve illustrate in acceptance sampling?

Accepted Answer

The relationship between the lot’s quality and the probability of accepting the lot.

Answer

The cost of inspecting one unit of product.

Answer

The average number of defects in a sample.

Question 32

Which of the following factors is essential to consider when selecting an appropriate acceptance sampling plan?

Accepted Answer

The cost of inspection and the cost of accepting a defective lot.

Answer

The day of the week the inspection takes place.

Answer

The color of the product packaging.

Question 33

A manufacturer wants to be very certain of rejecting lots with a high percentage of defects. What would be the effect of choosing a smaller sample size in their acceptance sampling plan?

Accepted Answer

It would increase the risk of accepting lots with high defect rates.

Answer

It would decrease the risk of accepting lots with high defect rates.

Answer

It would have no effect on the risk of accepting lots with high defect rates.

Question 34

Which of the following is a disadvantage of using acceptance sampling compared to 100% inspection?

Accepted Answer

There is always a risk of accepting a bad lot or rejecting a good lot.

Answer

It is always more expensive than 100% inspection.

Answer

It requires more complex statistical calculations.

Question 35

In acceptance sampling, what does the term AQL represent?

Accepted Answer

Acceptable Quality Level

Answer

Average Quantity Limit

Answer

Assessed Quality Lot

Question 36

Which type of sampling plan is typically used when the cost of inspection is very high, and rejecting a good lot is highly undesirable?

Accepted Answer

Multiple sampling plan

Answer

Lot-by-lot sampling plan

Answer

Single sampling plan

Answer

Continuous sampling plan

Question 37

Which acceptance sampling plan involves inspecting a single sample from a lot and making a decision based solely on that sample?

Accepted Answer

Single sampling plan

Answer

Multiple sampling plan

Answer

Sequential sampling plan

Answer

Double sampling plan

Question 38

A double sampling plan is typically used when:

Accepted Answer

The first sample does not provide conclusive evidence of acceptance or rejection.

Answer

The lot size is very small.

Answer

The inspection cost is low.

Question 39

Which type of acceptance sampling plan involves taking multiple samples from a lot and making a decision based on the combined results of all samples?

Accepted Answer

Multiple sampling plan

Answer

Single sampling plan

Answer

Sequential sampling plan

Answer

Double sampling plan

Question 40

The operating characteristic (OC) curve for an acceptance sampling plan shows the relationship between:

Accepted Answer

The probability of acceptance and the true quality level of the lot.

Answer

The inspection cost and the producer's risk.

Answer

The sample size and the lot size.

Question 41

Which of the following is a key factor to consider when selecting an acceptance sampling plan?

Accepted Answer

The acceptable quality level (AQL).

Answer

The inspection cost.

Answer

The sample size.

Answer

The lot size.

Question 42

A lot tolerance percent defective (LTPD) of 10% means that:

Accepted Answer

10% of the lots submitted for inspection will be accepted even though they contain more than 10% defectives.

Answer

10% of the lots submitted for inspection will be rejected even though they contain less than 10% defectives.

Question 43

Which of the following is NOT an advantage of acceptance sampling?

Accepted Answer

It provides 100% assurance of the quality of the lot.

Answer

It allows for the use of statistical methods.

Answer

It reduces inspection costs.

Question 44

A sequential sampling plan is typically used when:

Accepted Answer

The cost of inspection is high and the lot size is large.

Answer

The consumer's risk is high.

Answer

The producer's risk is low.

Question 45

The producer's risk in acceptance sampling is the probability of:

Accepted Answer

Rejecting a good lot.

Answer

Making a wrong decision.

Answer

Incurring high inspection costs.

Answer

Accepting a bad lot.

Question 46

Which of the following is a disadvantage of acceptance sampling?

Accepted Answer

It can lead to the acceptance of lots that do not meet specifications.

Answer

It requires specialized knowledge.

Answer

It is time-consuming.