# Industrial Engineering Questions and Answers – Inspection Sampling Plans

This set of Industrial Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Inspection Sampling Plans”.

1. When a decision on acceptance or rejection of lot is based on one sample, what is it called as?
a) A double sampling plan
b) A single sampling plan
c) A sequential sampling plan
d) Multiple sampling plans

Explanation: When an inspection is done based on a single sample drawn from the lot, then it is referred to as a single sampling plan.

2. Which sampling plan can be used for inspection of a large number of units?
a) Single sampling plan
b) Double sampling plan
c) Sequential sampling plan
d) Multiple sampling plans

Explanation: Generally, for the inspection of the units having a very large number of quantities, single sampling plan is used to make quick and faster decisions.

3. A rectified lot is only inspected for those defects which caused the rejection.
a) True
b) False

Explanation: For inspection of lots using acceptance sampling, after a mutual negotiation both the consumer and producer will make the following agreements.
i. Each lot is accepted based on an acceptable sample drawn at random from a lot.
ii. The defective sample articles of all the lots will be replaced by good articles.
iii. Rejected lots are returned to the producer for rectification.
iv. The rectified lots will be inspected only for those defects which caused for rejection.

4. Who developed Sampling plans?
a) Harold F. Dodge
b) Gilbreth
c) Taylor
d) Fayol

Explanation: Harold F. Dodge is famously known for his contributions to the science of statistical quality control. He introduced the technique of acceptance sampling for inspection of goods.

5. The decision of acceptance or rejection of a lot is done based on one or two samples of inspection in __________ sampling plan.
a) Double
b) Single
c) Sequential
d) Multiple

Explanation: In a double sampling plan, one or two samples are drawn from a lot for inspection. The decision of acceptance or rejection of lot is done based on the combined acceptance number (C = C1 + C2).

6. Double sampling plan either accepts or rejects a lot based on the quality of ______ inspected samples.
a) One
b) Two
c) One or two
d) Three

Explanation: Double sampling plan either accepts or rejects a lot based on the quality of one or two inspected samples. It is because the lot can be directly accepted if the number of defectives in the first sample drawn is less than the acceptance number (C1).

7. Double sampling plan requires the less total amount of inspection compared to the single sampling plan.
a) True
b) False

Explanation: Double sampling plan requires less inspection compared to the single sampling plan. It is because the tendency for rejection of lots in a single sampling plan is more. Hence, lots inspected through a single sampling plan are more prone to 100% inspection than that of double sampling plans.

8. Which sampling plan has more chances for rejection of lot?
a) Double
b) Single
c) Sequential
d) Multiple

Explanation: Single sampling plan has more chances for rejection of lot. It is because it gives only one chance for inspection and decision making. It is to be noted that the double sampling plan has comparatively fewer chances of rejection of lot.

9. Which sampling plan has less cost of administration?
a) Single sampling plan
b) Double sampling plan
c) Sequential sampling plan
d) Multiple sampling plans

Explanation: Single sampling plan has less cost of administration because it requires only one sample to be inspected, all other plans require more cost of administration.

10. The information available regarding prevailing quality level is less in case of a single sampling plan and more in case of a double sampling plan.
a) False
b) True

Explanation: Information available regarding prevailing quality level is more in case of a single plan and less in case of double sampling plan i.e., more information is available in case of single sampling plan and comparatively less information is available regarding double sampling plan.

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