Find out the quality, Mechanical Engineering

Assignment Help:

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


Related Discussions:- Find out the quality

Evaluate the directions and magnitude of principal stresses, (a) At a point...

(a) At a point in a material under stress, the resultant intensity of stress across a certain plan is 100 N/mm 2 (compressive) inclined at 30 o to its normal. On another plane th

Manufacturing process, Deferentiate between hot working and cold working p...

Deferentiate between hot working and cold working processes

Co2 moulding, more about the carbon dioxide(co2) moulding process,for my se...

more about the carbon dioxide(co2) moulding process,for my seminar topic.

Binomial distribution, Binomial distribution: Let X follow a binomial ...

Binomial distribution: Let X follow a binomial distribution with parameters n = 4 and p = 0.5. Tabulate P ( ¦X - μ¦ ≥ k ) and σ 2 /k 2 for k = 1,2,3,4,5 and verify that Cheby

Dom, what is offset inertia force

what is offset inertia force

Define sweep pattern, Sweep pattern It is used to sweep the complete ca...

Sweep pattern It is used to sweep the complete casting by means of a plane sweep. These are used for generating large shapes which are axis-symmetrical or prismatic in nature s

Mass balances on systems, To make strawberry jam, a two-stage process is us...

To make strawberry jam, a two-stage process is used as shown in the figure.  First, crushed strawberries and sugar are mixed in a 45:55 ratio by mass. Then the mixture is heated to

Centrifugal air compressor, Centrifugal air compressor: A centrifugal...

Centrifugal air compressor: A centrifugal air compressor delivers 15Kg of air per minute. The outlet and inlet conditions are At inlet: Velocity = 5m/sec, enthalpy = 5KJ

Magnitude of frictional force after perfect rolling begins, What is the mag...

What is the magnitude of frictional force after perfect rolling begins and why? solution) After pure rolling begins,frictional force is 0. This is because the velocity of he c

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd