# Industrial Engineering Questions and Answers – Sampling Inspection by Attributes

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

1. What is the maximum allowable percent defectives for the purpose of sampling inspection that the consumer finds definitely acceptable?
a) Average outgoing quality (AOQ)
b) Acceptable quality level (AQL)
c) Rejectable quality level (RQL)
d) Indifferent quality level (IQL)

Explanation: Acceptable quality level (AQL) represents the maximum proportion of defectives which the consumer finds definitely acceptable. The value of AQL has to be selected based on the negotiation of the consumer and the producer.

2. What is Rejectable quality level (RQL) also called as?
a) Acceptable Quality Level (AQL)
b) Lot Tolerance Percent Defective (LTPD)
c) Indifferent Quality Level (IQL)
d) Average Outgoing Quality Level (AQL)

Explanation: Rejectable quality level is also called as “Lot tolerance percent defective” (LTPD). It is the minimum proportion of defectives which the consumer finds definitely unacceptable.

3. What is the probability of acceptance for Acceptable Quality Level (AQL)?
a) Very high
b) High
c) Moderate
d) Low

Explanation: The probability of acceptance for acceptable quality level (AQL) is very high as it indicates the only small proportion of bad components in the lot.

4. Rejectable quality level (RQL) has a very low probability of acceptance.
a) True
b) False

Explanation: RQL has a very low probability of acceptance as it represents the minimum proportion of defectives which the consumers finds definitely rejectable.

5. Rejectable quality level (RQL) is the ________ allowable percent defectives for the purpose of sampling inspection that the consumer finds definitely unacceptable.
a) Maximum
b) Minimum
c) Average
d) Maximum or minimum

Explanation: Rejectable quality level (RQL) is the minimum allowable percent defectives for the purpose of sampling inspection that the consumer finds definitely unacceptable. It is on the right side of the OC curve. It has a high proportion of defectives and very low probability of acceptance.

6. When the lot is having the acceptable quality level (AQL) level less the selected acceptable quality level (AQL), then what lot is treated as?
a) Superior quality
b) Inferior quality
c) Either superior or inferior depending on sample size (n)
d) Neither superior nor inferior

Explanation: The lots having acceptable quality level (AQL) less than the selected acceptable quality level (AQL) are treated as superior quality and lots having more than the selected acceptable quality level (AQL) are treated as inferior quality.

7. What does the probability of accepting a lot at rejectable quality level (RQL) level represent?
a) Producer’s risk
b) Consumer’s risk
c) Retailer’s risk
d) Worker’s risk

Explanation: The probability of accepting a lot at rejectable quality level (RQL) represents consumer’s risk because consumer accepts bad quality products due to good sample.

8. The probability of accepting a lot at ____ level represents the producer’s risk.
a) Rejectable quality level (RQL)
b) Acceptable quality level (AQL)
c) Indifferent quality level (IQL)
d) Lot tolerance percent defective (LTPD)

Explanation: The probability of accepting a lot at an acceptable quality level (AQL) level represents the producer’s risk because consumer rejects good quality products due to a bad sample.

9. What is the quality level between acceptable quality level (AQL) and rejectable quality level (RQL)?
a) Acceptable quality level (AQL)
b) Lot tolerance percent defective (LTPD)
c) Indifferent quality level (IQL)
d) Average outgoing quality level (AQL)

Explanation: Indifferent quality level (IQL) is the quality level between acceptable quality level (AQL) and rejectable quality level (RQL). The defectives present in the lot are more than the acceptable quality level (AQL) and less than the rejectable quality level (RQL).

10. The consumers are said to be indifferent in the lot that exists in _____ level.
a) Acceptable quality level (AQL)
b) Lot tolerance percent defective (LTPD)
c) Indifferent quality level (IQL)
d) Average outgoing quality level (AQL)

Explanation: For a lot in indifferent quality level (IQL), the defectives present in the lot are more than the acceptable quality level (AQL) and less than the rejectable quality level (RQL). For the lots that exist in indifferent quality level (IQL), the consumer is said to be indifferent.

11. What is the quality level having a probability of acceptance of about 50% for a given sampling plan?
a) Acceptable quality level (AQL)
b) Lot tolerance percent defective (LTPD)
c) Indifferent quality level (IQL)
d) Average outgoing quality level (AQL)

Explanation: Indifferent quality level (IQL) is the quality level having a probability of acceptance of about 50% for a given sampling plan.

Sanfoundry Global Education & Learning Series – Industrial Engineering.

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