Civil and Environmental Engineering Answers

1.)  A 300-mm pipe carries oil of sp gr 0.812 at a rate of 0.111 m /s, and the pressure at a point A is 18.4 kPa gage. If point A is 1.89 m above the datum plane, calculate the energy at A.

2.) Water flows upward in a vertical 300-mm pipe at the rate of 0.222 m /s. At point A in the pipe the pressure is 210 kPa. At B, 4.57 m above A, the diameter is 600 mm, and the lost head A to B equals 1.83 m. Determine the pressure at B.

3.) A 12′′ pipe line carries oil of specific gravity 0.811 at a velocity of 80.0 ft/sec. At points A and B, measurements of pressure and elevation were 52.6 psi and 100.0 ft and 42.0 psi and 110.0 ft, respectively. For steady flow, find the lost head between A and B. 

4.) A reservoir supplies water to a horizontal 6′′ pipe 800 ft long. The pipe flows full and discharges into the atmosphere at the rate of 2.23 cfs. What is the pressure in psi midway in the pipe, assuming the only lost head is 6.20 ft in each 100 ft of length? 

From the open compass traverse shown, if the forward bearing of line AB is N 75°30’ E, compute the: a. Forward and backward bearing of each line b. Forward and backward azimuth for each line. Tabulate values accordingly. LINE FORWARD BACKWARD BEARING AZIMUTH FROM NORTH AZIMUTH FROM SOUTH BEARING AZIMUTH FROM NORTH AZIMUTH FROM SOUTH AB BC CD

1. Use the Cu-Ni phase diagram

(a)Based on the phase diagram, comment on the solubility of Cu and Ni in eachother and explain your answer.

(b)What type of solid solutions are resulting alloys? Explain your answer.

(c)For a Cu-40Ni alloy (60wt%Cu, 40wt%Ni), determine the degrees of freedom and the phase composition at

(i)1300°C

(ii)1250°C

(iii)1200°C

1.Use the Cu-Ag phase diagram.

(a) What is the maximum solubility of Cu in Ag, and at what temperature do you get the maximum solubility?

(b)What is the maximum solubility of Ag in Cu, and at what temperature do you get the maximum solubility?

(c)(i)What transformation is taking place at point E

(ii)At what temperature and composition does the transformation at point E take place?

(iii)What is the significance of the transformation at point E?

(iv) Sketch, label and describr the microstructure formed at point E.

(d) For theCu-Ag alloy, determine

(i)phase composition at 1100°C

(ii)phase composition at 900°C

(iii)phase composition at 600°C

Note: point E is an eutectic point.

A pipe of 40 mm bore conveys air at a mean velocity of 21.5 m· s−1. The density of the air is

1.225 kg ·m−3 and its dynamic viscosity is 1.8 × 10−5 Pa · s. Calculate that volume flow rate of

water through the pipe which would correspond to the same value of friction factor f if the

dynamic viscosity of water is 1.12 × 10−3 Pa · s. What type of flow is exhibited in this pipe?

A tapered pipe is bent at 600 in the vertical plane. The diameters of inlet and outlet are 200cm

and 400cm respectively. The center of the outlet is 180cm above the inlet. The pressure at outlet

A field is in the form of a regular pentagon. The direction of the bounding sides was surveyed with an assumed meridian of 5° to the right of the true north and south meridian. As surveyed with an assumed meridian, the bearing of one side AB is N 33° 20’ W. Compute the true bearing and azimuth of each side of the field.

Show that 𝑦 = ln (𝑥) is a solution of 𝑥𝑦′′ + 𝑦′ = 0 

Two tangents having azimuths 240 and 282 degrees are connected by a spiral curve with 191 m radius of circular curve. The width of roadways is 15 m. If the design velocity is 75 kph. Determine the ff.

Write the overall reaction for the situation in which acetate is the donor and carbon source, nitrate is the acceptor and nitrogen source, and f. = 0.333.