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

A common cell control software, A Common Cell Control Software  In this...

A Common Cell Control Software  In this section, fine and common implemented cell control software are developed, that is based upon a transition table, to show the restriction

Governors, describe the following characteristics sensitivity stability is...

describe the following characteristics sensitivity stability isochronous

Mechanism and machine, define frame of a machine. which link of the machine...

define frame of a machine. which link of the machine is known as frame?

Hydrostatic pressure, can a swimming pool that is full be cracked or lifted...

can a swimming pool that is full be cracked or lifted by hydrostatic pressure?

CUPOLA FURNACE, WHAT IS THE HISTORY AND COMPOSITION OF CUPOLA FURNACE?

WHAT IS THE HISTORY AND COMPOSITION OF CUPOLA FURNACE?

Illustrate the several kinds of chips, (a) Illustrate the several kinds of ...

(a) Illustrate the several kinds of chips formed during metal cutting with neat diagrams. (b) Why is Titanium Nitride a valuable tool coating? (c) Give the differences betwee

Selection of elctrodes, Q. Describe the Selection of elctrodes? The sel...

Q. Describe the Selection of elctrodes? The selection of a proper electrode for electric arc welding is very important to obtain a sound welded joint of proper strength. The va

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

Find out the maximum deflection in beam, Find out the maximum deflection in...

Find out the maximum deflection in beam: A beam of span 8m is loaded with UDL of 10 kN/m over the middle half portion. Discover the maximum deflection. EI is constant. Sol

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