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

Higher engineering mathematics by bs grewal, give me the solutions for high...

give me the solutions for higher engineering mathematics by bs grewal

Complete outer clutch lugs for deep cuts, Complete outer clutch lugs for de...

Complete outer clutch lugs for deep cuts : Visually check for any deep cuts formed on the outer complete clutch lugs.

Determine frequency of free oscillations, (a) Illustrate critical damping a...

(a) Illustrate critical damping and its uses. (b) A horizontal spring mass system with coulomb damping has a mass of 5 Kg attached to a spring of stiffness 1KN/m. if the coeffic

Express the compression force of hydraulic cylinder, Express the compressio...

Express the compression force C in the hydraulic cylinder of the car hoist in terms of the angle Θ, see Fig Q3. The mass of the hoist is negligible compared with the mass of the ve

Hydraulic jack, explain the operation manual of a hydraulic jack

explain the operation manual of a hydraulic jack

.refrigeration, There are various refrigeration systems employing various m...

There are various refrigeration systems employing various methods. State any seven (7) refrigeration systems, mention the method(s) employed to attain low temperatures, and state a

Transformer for flash butt welding, Transformer for flash butt welding ...

Transformer for flash butt welding The transformer required for flash butt welding is similar to that needed for other resistance welding processes. Here, the transformer is to

Composites , For an automotive component of your choice that is traditional...

For an automotive component of your choice that is traditionally metallic, review how it could be re-engineered as a composite? How factors such as fibre & matrix type, fibre volum

What are the need of a surface condensing, (a) What are the need of a surfa...

(a) What are the need of a surface condensing ? Write disadvantages and advantages of Jet condenser and surface condenser. (b) A surface condenser is designed to handle 10000 Kg

Determine moment of this normal force - rectangular beam, Determine moment ...

Determine moment of this normal force - rectangular beam: A rectangular beam contains a width of 100 mm and a depth of 200 mm. This is utilized as a simply supported beam & th

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