1. No category

Name_______________________
Student I.D. ______________
CIVE321- Sample Final Examination
Attempt All Questions
Please fill in your answers (either √ if true, or X if false) to the brackets printed on the
right hand side of each problem.
(a) Specific heat of air at constant pressure (Cp) is bigger than the specific
heat of air at constant volume (Cv).
(b) Water has high latent heat of vaporization which modulates the climate
of mother earth.
(c) BOD is the amount of oxygen required by microorganisms to oxide
wastes aerobically.
(d) The specific heat of ice is less than that of water but its albedo is much
higher than that of water.
(e) Among various greenhouse gases, CH4 contributes the most to global
warming because it has a very high Global Warming Potential.
(f) If without greenhouse effect, global average annual temperature will be
15oC.
Pick only one answer (√) per sub-problem from each of the five choices
given below. Please note that simple calculations may be necessary to
determine the right answer.
(a) In the real world, most soils have the following property?
(i) Anisotropic and homogeneous
(ii) Isotropic and homogeneous
(iii) Anisotropic and heterogeneous
(iv) Isotropic and heterogeneous
(v) None of the above
(
)
(
)
(
)
(
)
(
)
(
X
)
(
(
(
(
(
)
)
)
)
)
(
(
(
(
(
)
)
)
)
)
(c) At 0oC, a black body with an emissivity of 0.9 will emit the following
amount of longwave radiation in Wm-2?
(
(i) 122
(
(ii) 175
(
(iii) 254
(
(iv) 284
(v) 365
(
)
)
)
)
)
(d) Which of the following assumptions is incorporated into Theis’ solution
to solving unsteady flow of confined aquifers?
(
(i) Homogeneous and isotropic
(
(ii) Areally finite
)
)
(b) Which of the followings leads to a form of non-point source pollution?
(i) Pipes of industries
(ii) Wastewater treatment plants
(iii) Animal feedlots
(iv) Domestic sewage
(v) Agriculture
(
(
(
(iii) Aquifer is of non-uniform thickness
(iv) Well is partial penetrating
(v) Well loss is accounted for
)
)
)
(f) A nuclear power plant discharges 2000MW of waste heat to a river
flowing at 47.78 m3/sec. The temperature of river will rise by:
(
)
(i) 2 oC
(
)
(ii) 5 oC
o
(
)
(iii) 10 C
(
)
(iv) 15 oC
o
(
)
(v) 20 C
(2)
(a) A black German shepherd of body surface area 1.5 m2, an average body
temperature of 35oC, is out in an open environment at -5oC. Assuming this dog is
a perfect blackbody, find its heat loss by radiation in watts.
(b) A BOD test is run using 100mL of treated wastewater mixed with 200mL of pure
water. The initial DO of the mix is 9 mg/L. After 5 days, the DO is 4 mg/L.
After a long period of time, the DO is 2 mg/L, and it no longer seems to be
dropping. Assuming nitrification has been inhibited so that the only BOD being
measured is carbonaceous, what is the BOD5 of the wastewater, and the reaction
rate constant k (day-1)?
(3) Calculate the transmissivity (T) and the storage coefficient (Sc) using the unsteady
Theis' equation. The pumping rate Q = 0.008 m3/s, and the following timedrawdown curve has been recorded from an observation well located 40.5m away
from the test well. Use the well function plot and the 3x5 log-log cycle paper.
Choose a convenient match point as we did in the class or in the laboratory.
Time
(min)
S(m)
Time
(min)
S (m)
1
5
10
16
25
50
70
100
150
240
0.412
300
1.092
450
1.394
600
1.592
780
1.771
900
2.064
1020
2.202
1140
2.361
1260
2.513
1380
2.73
2.824
2.989
3.177
3.22
3.277
3.328
3.372
3.412
3.453
(4) If the globally average annual precipitation is about 1.18 m, find out the energy in
Wm-2 needed to vaporize 1.18 m of water, assuming the average temperature of water on
earth is about 15oC, density of water is 1000 kg/m3, and 365 days per year. Hint:
compute the annual average energy needed over a m2 of surface area.
(4) The incoming solar radiation is 150 Wm-2 while the surface albedo of snowpack 
is 0.60, and its surface temperature is -10oC. Ignore cloud cover effect.
Assuming atmospheric emissivity = 1. Air temperature Ta = -5oC, relative
humidity of air = 1.0, wind velocity (U) is 1m/sec. Find the cold content (Qcc) of
the snowpack in J/m2, the melt rate M (in cm/day of snow water equivalent) after
overcoming the Qcc, given Tp = -10oC, total depth D = 30cm, s = 0.15 gm/cm3,
the latent heat of fusion = 333KJ/kg, and the thermal quality  = 0.95. Find also
the time to melt the snowpack completely after overcoming Qcc, assuming the
energy available for melting, U and Ta remains unchanged throughout the period
of melting. Only consider Qn, Qh, and Qe in computing Qo. Assume Dh = 7.75
Jm-3oC and De= 0.03 Jm-3Pa-1.