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Standards and quality practices in Production, Construction, Maintenance and Services
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Standards and quality practices in Production, Construction, Maintenance and Services
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Question 1 of 10
1. Question
1 pointsAssertion (A): Double sampling is preferred over single sampling when the quality or incoming lots is expected to be either very good or very bad.
Reason (R): With double sampling, the amount of inspection required will be lesser than that in the case of single sampling.Correct
A is false but R is true
Incorrect
A is false but R is true

Question 2 of 10
2. Question
1 pointsWhich one of the following statements is not correct?
Correct
Double sampling results in more inspection than single sampling if the incoming quality is very bad.
Incorrect
Double sampling results in more inspection than single sampling if the incoming quality is very bad.

Question 3 of 10
3. Question
1 pointsWhich one of the following is not the characteristic of acceptance sampling?
Correct
It gives definite assurance for the conformation of the specifications for all the pieces
Incorrect
It gives definite assurance for the conformation of the specifications for all the pieces

Question 4 of 10
4. Question
1 pointsAssertion (A): Sampling plans with acceptance numbers greater than zero are generally better than sampling plans with acceptance number equal to zero.
Reason (R): Sampling plans with acceptance numbers greater than zero have a larger sample size as compared to similar sampling plans with acceptance numbers equal to zero.
Correct
A is false but R is true
Incorrect
A is false but R is true

Question 5 of 10
5. Question
1 pointsAssertion (A): In attribute control of quality by sampling, the sample size has to be larger than variable control.
Reason (R): Variables are generally continuous, and attributes have few discrete levelsCorrect
Both A and R are individually true and R is the correct explanation of A
Incorrect
Both A and R are individually true and R is the correct explanation of A

Question 6 of 10
6. Question
1 pointsConsider the following statements in respect of double sampling plan:
1. The average number of pieces inspected is double that of a single sampling
2. The average number of pieces inspected is less than that for single sampling
3. The decision to accept or reject the lot is taken only after the inspection of both samples
4. The decision to accept or reject the lot is reached sometimes after one sample and sometimes after two samples
Which of these statements are correct?Correct
2 and 4
Incorrect
2 and 4

Question 7 of 10
7. Question
1 pointsAssertion (A): In dodge Romig sampling tables, the screening inspection of rejected lots is also included.
Reason (R): Dodge Romig plans are indexed at an LTPD of 10%Correct
Both A and R are individually true but R is not the correct explanation of A
Incorrect
Both A and R are individually true but R is not the correct explanation of A

Question 8 of 10
8. Question
1 pointsThe product is assembled from parts A and B. The probability of defective parts A and B are 0.1 and 0.2 respectively. Then the probability of the assembly of A and B to be nondefective is:
Correct
ExplanationAns. (b) It is a case of mutually independent events. Probability that the part A is nondefective = 1 – 0.1 = 0.9
Probability that PartB is nondefective, = 1 – 0.2 = 0.8
Hence, probability that both PartA and PartB are nondefective = 0.9 × 0.8
= 0.72.Incorrect
ExplanationAns. (b) It is a case of mutually independent events. Probability that the part A is nondefective = 1 – 0.1 = 0.9
Probability that PartB is nondefective, = 1 – 0.2 = 0.8
Hence, probability that both PartA and PartB are nondefective = 0.9 × 0.8
= 0.72. 
Question 9 of 10
9. Question
1 pointsA control chart is established with limits of ± 2 standard errors for use in monitoring samples of size n = 20. Assume the process to be in control. What is the likelihood of a sample mean falling outside the control limits?
Correct
4.5%
Incorrect
4.5%

Question 10 of 10
10. Question
1 pointsIn a study to estimate the idle time of a machine, out of 100 random observations the machine was found idle on 40 observations. The total random observations required for 95% confidence level and ± 5% accuracy is:
Correct
2400
Incorrect
2400