Find out the quality, Mechanical Engineering

Find out the quality:

ABC industries manufacture X-band radar scanners utilized to detect speed traps. The printed circuit boards in the scanners are bough from an outside vendor. The vendor generates the boards to an AQL of 2% defectives and is eager to run a 5% risk α of having lots of this level or fewer defectives discarded. The company considers lots of 8% or more defectives (LTPD) unacceptable and wants to ensure that it shall accept such poor quality lots not more than 10% of the time (β). A large shipment has just been delivered. What values of n and c must be choose to find out the quality of this lot?

Solution

It is given in the problem that

AQL = 0.02, α = 0.05, LTPD = 0.08 and β = 0.1. We can use table 14.6 to calculate c and n.

Therefore, the appropriate sampling plan is C = 4 and n = 100. Up to four defects found in the lot, the lot shall be accepted.

Table shows several acceptance numbers C. Corresponding to the specific C values, sample size is constant.

          Table: Data for Deriving a Single Sampling Plan

(Derived from Poisson Cumulative Table with α = 0.05 and β = 0.10)

743_Acceptance Sampling.png

In the present case LTPD/AQL = 4.

If you look at the Table, ratio n p0.10 / n p0.95 is 4.06 when C = 4 which is nearby to the ratio of LTPD/AQL.

n p0.10  = 7.99

n × 0.08 = 7.99

n ≈ 100

Posted Date: 2/1/2013 7:31:14 AM | Location : United States







Related Discussions:- Find out the quality, Assignment Help, Ask Question on Find out the quality, Get Answer, Expert's Help, Find out the quality Discussions

Write discussion on Find out the quality
Your posts are moderated
Related Questions
which are the different types of molding sands?explain each

Boiler efficiency and heat losses, heat Balence sheet, boiler draught, high pressure boiler

Describe the key terms i. Write two differences between boiler and turbine. ii. Compare the rankine cycle with carnot cycle in terms of efficiency and work ratio iii.

Compute the displacement of the particle: The acceleration time diagram for particle is as specified below .Computed velocity of the particle at several time intervals, plot v

define elastomer.explain in details?


Q. Describe Fire clay and Kaolinite Binders? Fire clay : Fire clay is refractory clay usually found in the coal measures. Kaolinite: Its general composition is al 2 o 3

Consider the power system as designed below. The duty fluid is water, and has a mass flow 0.75 kg/ s and all piping through which the liquid flows has diameter 1'', while the steam

Define the nature of shear force and bending moment under load variation. Sol.: The nature of SF and BM variation under two-load region is given in the table below