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

MOS, limitations of euler''s theory

limitations of euler''s theory

Generation of continuation, Generation of Continuation It is assumed th...

Generation of Continuation It is assumed that a partial schedule (which may be empty schedule) is given. For this partial schedule, a number of possible continuations is genera

Carbon monoxide-general safety tips , Carbon Monoxide:  If the engine has ...

Carbon Monoxide:  If the engine has to be started make sure the area is well ventilated. Never start the engine in an enclosed area without using the exhaust duct, since exhaust g

Manufacturing systems and technology, The first successful numerical machin...

The first successful numerical machine tool was developed at MIT in the year:

Estimate the air flow velocity , A smooth glass plate is coated with a spec...

A smooth glass plate is coated with a special electrically conductive film that may be used to produce a constant heat flux on the plate. Estimate the air flow velocity which must

Use of stainless steels in welding, Q. Use of Stainless Steels in welding? ...

Q. Use of Stainless Steels in welding? Considerable care must be exercised to obtain sound, crack-free welds. These difficulties are pronounced when welding very high-chromium

Advance dynamics, Ask question i have an assisgment can you please tell me ...

Ask question i have an assisgment can you please tell me how much does it cost #Minimum 100 words accepted#

Working principle of ignition system , Working Principle of Ignition System...

Working Principle of Ignition System: An alternating current (AC) is generated when a magnet moves between two stationary coils. In a magneto, a coil of wires moves between two m

Derive the finite element formulation-galerkin method, Derive the finite el...

Derive the finite element formulation  for a tapered bar element using Galerkin's method.                                                 1- Start with. 2- Use and as shap

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