Chapter 11, Problem 2QP

A large tank contains 50 gallons of water in which 10 lbs of salt is dissolved. Water containing 2 lbs of salt per gallon flows into the tank at the rate of 5gal/min .The mixture is kept well-stirred and flows out of the tank at the rate of 3gal/min Find: a) The amount of salt in the tank after 60 minutes. b) The amount of water in the tank after 60 minutes.

Find the discharge coefficient, threshold heat flux, combustion efficiency and emissivity factor for both propane and butane separetly. The pipe which would contain thesge gases is 30 inches in diameter and has an operating pressure of 1000psig.

Choose all the answers that correctly explain why an incoming inspection can be safely eliminated by computer makers. SPC provides some assurance that the monitors are roughly uniform in quality. Prior inspection of the monitors saves the computer makers money because they are confident that the SPC of the monitor manufacturer ensures that all of the monitors are of acceptable quality. Assuming that uniform quality is sufficiently high, the purchaser does not need to inspect the monitors as they arrive because SPC has already achieved the goal of that inspection. Assuming that uniform quality is sufficiently high, the purchaser does not need to inspect the monitors as closely as if they had not been previously inspected. SPC provides some assurance that the monitors are absolutely uniform in quality. Prior inspection of the monitors saves the computer makers money because they are confident that the SPC of the monitor manufacturer ensures that most of…

A manufacturing company produces steel rods. The length of these rods is critical to their customers. The company aims to manufacture rods with a mean length of 150 cm. However, due to variability in the manufacturing process, the lengths of the rods follow a normal distribution. The company's quality control department samples 30 rods and finds that they have a mean length of 151 cm and a standard deviation of 2 cm. Calculate the Process Capability Index (Cp) and the Process Performance Index (Ppk) for this process. Assume the customer's specification limits are 147 cm and 153 cm for the length of the rods.

16. Six per cent, on average, of manufactured spindles are outside stated tolerances. The spindles are randomly packed in boxes of 50 and dispatched in cartons of 100 boxes. For any one carton, determine the number of boxes likely to contain 0, 1, 2, 3, 4, 5-or-more defectives.

(3) The Elon Company manufactures parts for an aircraft company using three computerized numerical controlled (CNC) turning centers. The company has to decide which machines are capable of producing a specific part with design specifications of 0.0970 inch ± 0.015 inch. The machines have the following parameters: Machine 1 (x= 0.0995, o = 0.004); Machine 2 ( = 0.1002, o = 0.009); Machine 3 (x = 0.095, o = 0.005). Determine which machines (if any) can produce the products within the design specifications. ||

Suppose that material hardness is normally distributed with a mean of 52 and a standard deviation of 1. Specification limits for hardness are from 45 to 55. What is Cp?

Webster Chemical’s nominal weight for filling tubes of caulk is 8.00 ounces ± 0.60 ounces. The target process capability ratio is 1.33.  The current distribution of the filling process is centered on 8.054 ounces with a standard deviation of 0.192 ounces.  Compute the process capability ratios Cp and Cpk to assess whether the filling process is capable and set properly.

Tyler Apiaries sells bees and beekeeping supplies. Bees (including a queen) are shipped in special packages according to weight. The target weight of a package is 16 kg. Historically, Tyler's shipments have weighed on average 16 kg, with a standard deviation of 0.8 kg. The buyer will accept some reasonable variation in weight as long as the variation is within a range of +/-3 kg. What is the process capability ratio?