Metrology and Quality Control - Mechanical Engineering (MCQ) questions and answers for Q. 4983

Q.  Which of the following statements is/are false?

1. Fault tree analysis method is used to determine reliability of product
2. The goal of Six Sigma is to reduce number of defects to 2.4 parts per billion
3. Six sigma is represented by normal distribution curve
4. Poka yoke is a policy which prevents occurrence of human errors
- Published on 07 Aug 15

a. Only statement 3
b. Statement 2 and statement 3
c. Statement 1, 3 and 4
d. Only statement 2

ANSWER: Only statement 2

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    Discussion

  • Sravanthi   -Posted on 28 Oct 15
    Fault tree analysis

    - It is a mathematical analysis used to determine reliability of products.
    - The reliability (R) of a system is calculated by using the formula: R = 1 – Probability of failure
    - It graphically depicts combination of events which lead to failure of products.

    Six Sigma

    - Six sigma is a quality improvement programme which reduces number of defects to 3.4 parts per million.
    - The number of defects are just 3.4 parts per million, hence is considered as zero defect production.
    - It is represented by normal distribution curve.
    - High acceptable parts are produced using limits of ± 6σ

    Poka yoke

    - Poka Yoke is used to prevent human errors in production line.
    - The word Poka Yoke means avoiding inadvertent errors.
    - Poka Yoke satisfies three levels such as: error elimination, in process detection and out process detection.

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