2. The BOD5 of a waste sample was found to be 60 mg/L The initial oxygen concentration of the BOD dilution water was equal to 8.6 mg/L, the DO concentration measured after incubation was equal to 8.6 mg/L and the size of the sample used was equal to 10 mL. If the volume of the BOD bottle used was equal to 300 mL, then the initial DO concentration (in mg/L) of the waste sample is: O 2.025 2.050 O 2.250 2.400 2600

2. The BOD5 of a waste sample was found to be 60 mg/L The initial oxygen concentration of the BOD dilution water was equal to 8.6 mg/L, the DO concentration measured after incubation was equal to 8.6 mg/L and the size of the sample used was equal to 10 mL. If the volume of the BOD bottle used was equal to 300 mL, then the initial DO concentration (in mg/L) of the waste sample is: O 2.025 2.050 O 2.250 2.400 2600

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Mechanical Processes

In civil engineering, the materials have to undergo a series of manufacturing processes before using them in construction and structural applications. These manufacturing processes form the foundation stone of mechanical processes. Some of the civil engineering materials such as bars, metallic beams, metallic columns, surveying equipment, earthmovers, overhead cranes, structural and construction components, and even cement that is the most fundamental construction component need to undergo different manufacturing processes before they are ready to use. These processes are mechanical.

Question

2. The BOD5 of a waste sample was found to be 60 mg/L The initial oxygen concentration of the
BOD dilution water was equal to 8.6 mg/L, the DO concentration measured after incubation was
equal to 8.6 mg/L and the size of the sample used was equal to 10 mL. If the volume of the BOD
bottle used was equal to 300 mL, then the initial DO concentration (in mg/L) of the waste sample
is:
O 2.025
2.050
O 2.250
2.400
2.600
2.850
2.950

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Il Consider the capability of a process that puts pressurized grease in an aerosol can. The design specification calls for an average of 50 pounds per square inch (psi) of pressure in each can with an upper tolerance limit of 56psi and a lower tolerance limit of 46psi. A sample is taken from production, and it is found that the cans average 51psi with a standard deviation of 2psi. Find the following unknowns. 1. Capability Index (Cpk) 2. Is the process capable at the 30 level? 3. What is the probability of producing a defect? Hind: use the standard normal table as seen below.
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