The rate of heat transfer, Q [energy/time = power] through a pipe wall between a fluid and the surroundings depends on fluid properties: density (ρ), viscosity (μ), specific heat (c_p [energy/temperature/mass]); and also on pipe and flow properties: the length (l), diameter (D), and thermal conductivity (λ [power/length/temperature]) of the pipe, fluid mean velocity (V), and the temperature difference (ΔT) between the pipe wall and the surroundings. Use dimensional analysis to express this system in terms of dimensionless numbers. The Π group that includes Q˙ should be expressed as a function of the other Π groups.

When confronted with a discrepancy in the plans and specifications, what form do you use to get an answer from the architect?

1- Submittal

2- AIA Form 101

3- RFI

4- RFP

Given the following excess rainfall hyetograph and 1-hr unit hydrograph, what would the 5th ordinate of the storm hydrograph be in cfs? Pn (intervals of 1 hr) = [0.2, 0.4 ,0.5 ,0.2 ,0 ,0.1] in UH (intervals of 1 hr) = [0, 100, 320, 450, 370, 250, 160, 90, 40, 0] cfs

Perform an ACI mix design using the following data (make assumptions as needed)

The 28-day compressive strength should be 4,000 psi. The concrete is to be used under exterior condition subject to deicer.

The slump should be between 3 and 4 in. and the maximum aggregate size should not exceed 1 in.

The coarse and fine aggregates in the storage bins are wet.

The properties of the materials are as follows:

Cement- Type I, specific gravity = 3.15

Coarse Aggregate:

Bulk specific gravity (SSD) = 2.70; absorption capacity = 1.1%; dry-rodded unit weight = 105 lb./ft.³

Moisture content = 2.1%

Fine Aggregate:

Bulk specific gravity (SSD) = 2.67; absorption capacity = 1.3%; fineness modulus = 2.70;

Moisture content = 2.8%

1. On one approach of an intersection with fixed time traffic signal, vehicles arrival rate is 600 vehicles per hour. The effective green time for this approach is 30 seconds, the saturation flow of this approach is 1800 vehicles per hour and the cycle time of the intersection is 80 seconds.

a. Evaluate the performance of the signal design i.e. will all vehicles clear during the green time?

b. Recommend the changes to the green time for this approach to achieve an optimum signal design i.e. If there is surplus green time, then state its value.

c. Due to a traffic incident, the original saturation flow is reduced by 20%. Will there be any delay under the new situation based on the original design? How many vehicles will experience the delay?

d. Under a new strategic transport plan to divert some vehicles to other areas, the saturation flow has been reduced to 1300 vehicles per hour by reconfiguring the layout of the intersection. Under this condition how may vehicles will be delayed in each cycle?

how does the annual temperature range depend on latitude?

why does the annual temperature range depend on latitude?

1-S0 in an activated sludge process represents _________________________ concentration.


2-X in an activated sludge process represents ___________________________ concentration.


3-Biomass present in the influent is a product of biomass concentration in the influent multiplied by ______________ ___________.

4-Hydraulic detention time is a ratio of ______________ and _________________.


5- ___________________ represents the portion of microorganisms discharged from the process.

Please write concrete specification in Performance approach

To make sure you understand what I mean, this is the 'Performance' approach for writing the specifications.

Performance (results) specifications Characteristics•

- Describe in detail the required performance or service characteristics of the finished product or system•

- Methods used to achieve desired results is left to the discretion of the contractor, but must be guaranteed

-Methods of testing and measurement, to evaluate the results, should be spelled out in the specifications.

1.What is a pre-bid subtrade proposal, and of what benefit is it to the contractor’s estimator?

a.To a general contractor?

b.To a subcontractor?

2.What is a pre-bid subtrade proposal, and of what benefit is it to the contractor’s estimator?

3.What are the benefits and disadvantages to a general contractor of having subtrades provide surety bonds?

A pumping well has four monitoring wells, MW1 is 20m, MW2 is 500m, MW3 is 600m, MW4 is 700m, and the pond is 950m from the pumping well. The drawdown measured at MW1 during the pumping test conducted at a rate of 0.240m3/min:

T=0.195m2/min and S=1.32x10^-4

What drawdown is expected at the four monitoring wells after 5 years of pumping at 30 L/s?

Mix the aggregates given the results of sieve analysis test in Table 1 in appropriate proportions, show the granulometry curves of each aggregate and mixture in Figure 2, calculate the fineness modulus (FM) of the mixture.