An air compressor is operating at a steady state. The air enters at with a volumetric flow rate 1.2 m^3/s at 170 kPa and 22 degrees celsius with negligible velocity and leaves at 1500 kPa with velocity of 200 m/s. The power to the compressor is 60 kW and the compressor is cooled at a rate of 15 kJ/kg. Determine the exit area.

A water harvesting pond is to be constructed by constructing an embankment across a narrow valley.

The top width of the embankment is kept at 3.6 m. using the information in the Table Q8, and taking the upstream and downstream side slopes as 3:1 and 2:1 respectively, a settlement allowance of 12.5%:

1. .       Fill up the table and estimate the earth volume required to construct the dam. Show sample calculations only.
2. .     Sketch the plan view, longitudinal section and centre cross section of the dam.

Table Q8

a. ) Rainwater harvesting is regarded as the simplest way of improving food security and accelerating environmental rehabilitation in the arid and semi-arid lands. Describe and discuss various technologies for rainwater harvesting for agriculture and domestic/livestock water supply             

2. ) What are the steps and data requirements in the design of an earth dam as a water harvesting and storage structure in an arid and semi-arid area?                                                                         

b). There is a general consensus that transport system shapes land-use, and that land-use shapes transport system. Bearing this in mind, discuss with relevant examples how in this relationship different land uses generate trips which call for varying transportation needs.

Define “transportation network” and discuss the network analysis problems that are interest in transportation engineering while explaining how the problems are interconnected. Discuss how the quality of a transportation network is assessed?

unfactored load; DL=27psf and LL=25 psf, span =36ft, spacing =6'0"

select the lightest joist that would satisy the condition

10k10

20k10

20k3

20k9

or anything you think is right

1. What is “gradually varied flow” and, particularly, a “backwater curve”?
2. why is it important in the engineering/ hydrologic (why it matters)
3. what are its strengths and weaknesses.

A ditch was channelized to augment its capacity to convey water from a lake to a detention pond. The channel is straight, and it has a trapezoidal cross-section with side slope 4:1 and bottom width 14 feet. The bottom elevation of the channel is 715.50 feet where it is connected to the lake, and 708.35 feet at the end of the channel where it joins the detention pond. The channel length is 950 feet, and it is lined with concrete with gravel on the bottom. (a) Use Manning’s equation to compute a rating curve for the channel cross section, at a location where channel bottom elevation is 709.27 feet. That is, construct a plot of stage (ft) versus discharge (ft3/s). For these computations, assume the value of the Manning roughness coefficient (n) equals 0.02. (b) At what flow discharge will the channel overflow its banks and cause flooding to occur? (c) Consider the hypothetical case in which the channel is simply excavated and not maintained, resulting in dense weeds as high as the flow depth. Assume a Manning’s n value equal to 0.08 in this case. For what flow discharge will the channel overflow its banks? How does this compare with the value computed in part (b)? (d) For the discharges that cause overflow in parts (b) and (c), is the flow super- or subcritical? What are the critical depths for those discharges?

The following data were recorded from a standard proctor compaction test. The
specific gravity of the soil grains is 2.8. The volume of the mould is 0.945 x 10-3
m
3
Mass (kg) 1,767 1,928 2.013 2.079 2.041 1.975
Water
content (%)
6 9 11 14 17 20

(i) Plot the compaction curve and determine the optimum water content and
maximum dry density.
(ii) Plot the zero air void curve.
(iii) If is proposed to achieve a relative compaction of 97% in the field, what is
the range of water content that would be allowed?
(iv) Determine the degree of saturation at the maximum dry density.

A certain municipality is planning to construct a new water treatment plant. The average water requirement is equivalent to 123456 m3 /d). The peak flow rate is twice the average flow rate. A jar test experiment revealed the following results: Alum dose: 15 mg/L Temperature: 20 o C Coagulation: G = 850 s-1 , t = 40 s Flocculation: GT =123456 . Settling: t = 1.5 h.

a) Determine the size of the coagulation tank (L=2W, W=D) and flocculation tank (L=4W, D=W). Note that if the depth is more than 3 m, you need to use multiple tanks.

b) What power is needed for the coagulation and flocculation units? [2 marks]

c) What would be the volume of Alum storage to serve one month requirements? [Assume density of alum is 1.5 g/cm3 ]

d) Determine the diameter and depth of the circular settling tank. Note that if the dimeter is more than 40 m, multiple tanks should be used.

CE102-Total Leadership in Innovation

1. What are your greatest leadership strengths?

2.What are your opportunities for growth as a leader?

3.How can you capitalize on your strengths?

4.What can you do to improve in areas where you have opportunities for growth?

A 3 meter-thick layer of clay, with a void ratio of 1.4 and compression index, recompression index, and coefficient of consolidation of 0.35, 0.02, and 0.5 m2/year, respectively, carries an effective overburden pressure of 85 kPa. The clay layer is located between two sand layers. Calculate the change (reduction) in thickness of the clay layer if pressure is increased to 105 kPa considering the following conditions: 1- Clay is normally consolidated. 2- Clay has an OCR of 1.15. 3- Clay has an OCR of 1.25 -Determine the time needed to reach 50% degree of consolidation. -What would be the reduction in thickness after 8 months of the loading increase in case “1”?

Water flows through a three-soil system placed in a 10 cm-wide square tube. Soil layers are described as follows:

Calculated the discharge (q) through each soil and through the system when water flows:
1- Parallel to layering (take head difference = 80 cm and length of all layers = 200 cm). 2- Perpendicular to layering (take head difference = 9 cm)

- In case 2, what would be the head at the middle of Soil “C”?

Explain HP bend witb diagram. Briefly explain the use.