WRITE COMPLETE SOLUTION

9. Suppose Paramecium caudatum cultured in a batch reactor obeys the logistic function

X(t) =20,000/3.0 + 50e^−0.01t   ; {t ϵ + ℝ}

Where:
          X(t) = organism count
           t      = time, hours

a. Determine the carrying capacity of the population.
b. Determine the time when the maximum growth rate is expected.
c. Determine the organism count added between the quarter of the maximum growth rate to
three-quarters of the maximum growth rate.

Q.1) Based on your understanding of Aggregate tests answer the following:

a. Show the differences between apparent specific gravity and effective specific gravity by drawing sketches for their aggregate particles.

b. Absorption and specific gravity are critical information for the Hot Mix Asphalt design engineer, Why?

c. How you can make check that the fine aggregate sample reaches the SSD case?


Q.2) Based on your understanding of Asphalt cement tests answer the following:

a. Asphalt binder at room temperature is solid. To be able to mix it with aggregate it must become liquid. How you can convert it to a liquid material (show all methods)?

b. Is there a direct measure for asphalt binder aging? Mention it or them and Explain your answer.

c. In solubility test AC should be moisture free, why?

the key objective of risk management is to increase the probability of a project achieving its goals and objectives. discuss how the nature of competitive tendering influences effective risk management in construction? your answer should include at least 2 suggestions of what clients can do to improve the outcomes of the competitive tendering process?

What is a clinker, which process should be applied to the clinker after production in order to obtain cement? Explain the reasons of that process

A trapezoidal channel carrying 280 cfs has a bottom width of 12 ft, side slope of 2 and a longitudinal bottom slope of 0.001. The critical depth is 2.25 ft and the normal depth is 2.78. The flow depth at the downstream end of this channel is 3.12 ft. Determine which of the statements below is correct.

Select one:

a.

The flow depth decreases in the flow direction.

b.

None of the above.

c.

A flow depth of 2.55 ft will not occur in this channel.

d.

If the channel is very long, a hydraulic jump will occur.

Explain how the 4 main components of cement (C3S, C2S, C3A and C4AF) each participate in the hydration process and contribute to the properties of hydrated cement/concrete.

A retaining wall x m high was designed to stabilize a horizontal ground surface. The back

of the wall is inclined 15 o to vertical direction and can be assumed rough with interface frictionangleofxo.Thesoilparametersareφ' =33o ,γ =18kN/m3,γ =20kN/m3.

Assume no seepage effects.

1. (a) Draw a diagram to show the given wall dimensions, relevant inclinations and the direction of the active force on the wall.

2. (b) Calculate lateral force on the wall assuming the ground water table is at the base of the wall.

3. (c) After a flood, the ground water table rises 0.5m above the wall top surface. Calculate the lateral force on the wall after the flood.

4. (d) If the weight of the wall is (500+ x) kN/m, is the wall safe against sliding after flooding event? Please show your calculations. . the value of x is 28

1. Bearing capacity of strip foundation is independent of water table location (True/False)

2. Density of sand significantly affects the bearing capacity factor Nq (True/False)

3. The bearing capacity of square footing (Length x Width = 39 x 39 m) is higher than strip footing (Width 39 m) under similar conditions (True/False)

4. Bending moment of 39 kNm increases the ultimate bearing capacity of strip footing having a width of 39 m (True/False)

5. Shape factors for square footing with inclined loading should always be set to 1.0 (True/False)

1. Answer the following questions related to “Type HE” cement
   • What property of this cement sets it apart from type GU?
   • What are the benefits of using this type of cement?
   • How does this type of cement differ from Type GU cement with respect to the relative amounts of C2S, C3S and C3A?

1. Which of the following statement is correct?
(a) The maximum stable slope in a coarse-grained soil (φ’= 39^o, in the absence of seepage, is half of 39^o
(b) Taylor’s method can be used to assess short term slope stability
(c) A saturated tension crack in the ground can stabilize slope
(d) The maximum stable slope in a coarse-grained soil (φ’= 39^o), in the presence of seepage, is 2 times of 39^o

2. Which below situation provides the largest bearing capacity for soil under a square footing (width 39m) placed 1m deep into the ground?
(a) When the water table is at the ground surface
(b) When the water table is at the base of the footing
(c) When the water table is at (1+ 39) depth from the ground surface
(d) When the water table is 39 above the ground surface

3. Which of the following statement is correct for a strip foundation (Length 39 m) placed on the ground surface?
(a) Shape factor is 1.0+ 39
(b) Depth factor is < 1.0
(c) Shape factor is 1.2
(d) Shape factor is 1.0

What principles guided President Hoover’s response to the Great Depression, and how did this restrict his ability to help the American people?

Answer in 2 paragraphs.

A simply supported reinforced concrete beam with uniformly distributed load of 10 kN/m has a span of 6.0 metres. The beam cross-section is 225 mm breadth by 300 mm depth. Sketch and design the beam. Make necessary and realistic assumptions where applicable

The flow hydrograph ordinates observed in a basin with a precipitation area of 500 km2 for a
3-hour showers are given in the table below. Assuming the base flow is constant and 10
m3/h;

a) Calculate the total volume of flow as m3, which consists of precipitation.
b) Calculate excess rainfall height and duration.
c) Determine the unit hydrograph which is equal to the precipitation period of excess
rainfall.

(time is given a hour 10m3/h ) not false..

The distance and depth values measured in various slices in a stream section and the measurement times and rotation numbers in a muline with coefficients a = 0.15 and b= 0.08 are given below.
a. Calculate the area, average velocity, and flow rate of each slice as well as the total area and average velocity of the entire cross section.
b. When measuring with another muline, it was measured as n = 22 when V = 1.94 m/s and n = 28 when V = 2.14 m/s. Determine coefficients of muline and equation of velocity. In a measurement made with this muline, calculate the flow rate according to making 35 rotations to the muline in 55 seconds.

A venturi flume is 1.3m wide at the entrance and 0.65m in the throat. Neglecting Hydraulic losses in the flume, calculate

The hump of 20cm is now installed at the throat so that a standing wave