Civil and Environmental Engineering Answers

a force acting 45 degrees below the negative x-axis is equivalent to a force acting litosphere

A simple manometer is used to measure the pressure of oil (sp. gr. = 0.8) flowing in a pipeline. Its right limb

is open to the atmosphere and left limb is connected to the pipe. The centre of the pipe is 9 cm below the

level of mercury (sp. gr. 13.6) in the right limb. If the difference of mercury level in the two limb is 15 cm,

determine the absolute pressure of oil in the pipe in N/cm2

.

A simple manometer is used to measure the pressure of oil (sp. gr. = 0.8) flowing in a pipeline. Its right limb

is open to the atmosphere and left limb is connected to the pipe. The centre of the pipe is 9 cm below the

level of mercury (sp. gr. 13.6) in the right limb. If the difference of mercury level in the two limb is 15 cm,

determine the absolute pressure of oil in the pipe in N/cm2

.

¨For simplicity, take n = 2.0 and use the value of f for complete turbulence, as given by Eq. (8.54).

¨All pipes are cast iron, and are at the same elevation. For initial flows, assume only values of 30,15, and 0 L/s (the zeros in dg and fh).

¨If the pressure head at a is 40 m, find the pressure head at d (which might represent a fire demand, for example) neglecting velocity heads.

¨Water flows through a pipe AB of diameter d1 = 50 mm, which is in series with a pipe BC of diameter d2 = 75 mm in which the mean velocity v2 = 2 m/s. At C the pipe forks and one branch CD is of diameter d3 such that the mean velocity v3 is 1.5 m/s. The other branch CE is of diameter d4 = 30 mm and conditions are such that the discharge Q2 from BC divides so that Q4 = ½ Q3. Calculate the values of Q1,v1,Q2,Q3,D3,Q4 and v4..

A new machine will cost $25,000. The machine is expected to last 4 years and has no salvage value. If the interest rate is 12%, determine the return and the risk associated with the purchase. Use present worth analysis.

Probability

0.3

0.4

0.3

Annual savings

$7,000

$8,500

$9,500

for the following data marks of 50 students given below find U=1

An overflow spillway with vertical u/s face is to be designed for a flood of 2100m3/s. The level of the spillway crest is at R.L of 130.0 and the river bed at R.L. of 100.0. The end walls of the spillway are 79m apart and there are 4 round-nosed piers, each 1m wide. Determine the total head over the crest. Take C=2.2 and Ka=0.1. Also tabulate the coordinates of the d/s profile

The simple span of 6 m W shape was used as a bridge crane runway girder. Assume that the crane wheel imparts a vertical load of 60 kN and a lateral load of 6 kN at the midspan applied at the top flange of the girder. A standard rail weighing 65 kg/m will be used. Assume that the top flange is not laterally braced between end supports.

Properties of W section:

Sx = 1280 x 10^3 mm^3 Fbx = 207 MPa

Sy = 361 x 10^3 mm^3 Fby = 238 MPa

a. Draw the loading diagram (attached in the solution set)

b. Determine the bending stress along the x-axis.

c. Determine the bending stress along the y-axis

d. Determine the ratio of the actual bending stresses to allowable bending stress.

find the volume of the region in the wedge cut from the cylinder x^2+y^2=1 by the planes z=-y and z=0.