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NOVEMBER 2024 CE BOARD EXAM REFRESHER HGE 3

1. A sharp-edged orifice 150 mm in diameter 9. What is the approximate elevation in

discharges oil under head of 3.35 m. The meters above sea level, assuming normal
average velocity at the vena contracta atmospheric conditions? Neglect vapor
is 7.85 m/s. What is the head lost in m? pressure. Air weighs 12 N/m3.
A. 0.2 C. 0.6 A. 6850 C. 8210
B. 0.4 D. 0.8 B. 7780 D. 7840

2. An iceberg having a specific gravity of Situation 3. The discharge pipeline of a

0.90 floats in saltwater having a water system consists of a 5500 m of 300
specific gravity of 1.03. If the volume – mm pipe joined by 3660 m of 450 – mm
of the ice above the surface is 500 m3, pipe that connects to the base of a huge
what is the volume of the iceberg in m3? water reservoir. The difference in
A. 3061.5 C. 3461.5 elevation between the water surface in
B. 4461.5 D. 3961.5 the reservoir and the center of the 300
– mm pipe at the end of the line is 45.7
3. A right cylindrical container of m. Neglecting velocity head and other
diameter D (meter) and H (meter) high is losses in head due to entrances and
filled with water Z (meter) deep. A using coefficient of friction of 0.02
piece of timber having a cross-sectional for both pipes.
dimension b×t (mm) and L (meter) long is
freely allowed to submerge and float in 10. Obtain the velocity of the water in the
a vertical position inside the bigger pipeline, in m/s?
container. The portion of the wood above A. 0.728 C. 0.443
the water surface is observed to be 2/3 B. 0.665 D. 0.500
the length of the timber. Given the 11. Obtain the velocity of the water in the
following information, evaluate the smaller pipeline, in m/s.
specific weight of the timber in kN/m3. A. 1.68 C. 1.40
D = 1 m, H = 5 m, Z = 3 m, b = 250 mm, B. 1.50 D. 1.75
t = 250 mm, L = 3 m 12. Evaluate the rate of flow in the pipes,
A. 3.35 C. 3.27 in m3/s.
B. 3.72 D. 3.44 A. 0.150 C. 0.132
B. 0.106 D. 0.095
Situation 1. A trapezoidal canal having a
depth of 2.25 m flows with a mean Situation 4. A liquid is discharged from a
velocity of 0.9 m/s. container through a circular orifice
having a diameter of 10 mm that is
4. Determine the discharge using the most located h meters from the liquid surface
efficient proportion, in m3/s. to the center of the orifice.
A. 12.68 C. 8.77
B. 14.09 D. 7.89 13. If the container is open to the
atmosphere, obtain the theoretical
5. Determine the discharge if the side discharge through the orifice in
slope is 1H to 2.5V and a depth of flow liters/sec when h=9.
is 2/3 its base width, in m3/s. A. 1.044 C. 0.564
A. 4.86 C. 9.62 B. 1.278 D. 0.852
B. 5.40 D. 8.66 14. If the container is moving upward at
acceleration half that of gravity.
6. Determine the discharge if the canal is Obtain the theoretical discharge
proportioned for minimum seepage with through the orifice in liters/sec when
side slope of 55°, in m3/s. h=9.
A. 8.77 C. 12.68 A. 1.044 C. 0.564
B. 7.89 D. 14.09 B. 1.278 D. 0.852

Situation 2. At a certain elevation above 15. If the container is open to the

sea level, a mercury barometer reads 700 atmosphere, and the coefficient of
mm. velocity is 0.90 and the coefficient of
contraction is 0.60. Obtain the
7. What would be the corresponding reading theoretical discharge through the
of a water barometer in mm? orifice in liters/sec when h=9
A. 8240 C. 7650 A. 1.044 C. 0.564
B. 6700 D. 9520 B. 1.278 D. 0.852
8. Evaluate the atmospheric pressure in kPa
at that level.
A. 88.8 C. 87.6
B. 90.5 D. 93.4

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NOVEMBER 2024 CE BOARD EXAM REFRESHER HGE 3

16. Which one of the following statements 23. The volume of a gas at constant
is not correct? temperature varies inversely as the
A. Specific energy is the total pressure applied to the gas. This
energy above the floor of an open principle is attributed to:
channel A. Boyle
B. For a given specific energy, two B. Pascal
depths exist and these are called C. Archimedes
alternate depths D. Bernoulli
C. Velocity of flow is critical at
maximum specific energy 24. Any body completely or partially
D. Critical velocity occurs at Froude submerged in a fluid (gas or liquid) at
number = 1 rest is acted upon by an upward, or
buoyant, force the magnitude of which is
17. All other conditions and parameters equal to the weight of the fluid
remaining the same, water hammer displaced by the body. This principle is
pressure can be reduced by attributed to:
A. using pipe of greater diameter A. Archimedes
B. using pipe of greater wall B. Pascal
thickness C. Torricelli
C. using a more elastic pipe D. Bernoulli
D. increasing the velocity of the
pressure wave 25. A theorem in fluid dynamics relating the
speed of fluid flowing out of an orifice
18. If a water tank, partially filled with to the height of fluid above the
water is being carried on a truck, opening.
moving with a constant horizontal A. Archimedes
acceleration, the level of liquid will B. Pascal
A. rise and fall alternately on the C. Torricelli
front side of the tank D. Bernoulli
B. fall on the rear side of the tank
C. remain the same on both side of ~o0o~
the tank Nothing Follows
D. rise on the rear side and fall on
the front side of the tank

19. As the depth of immersion of a vertical

plane surface increase, the location of
center of pressure
A. comes closer to the center of
gravity of the area
B. moves apart from the center of
gravity of the area
C. ultimately coincides with the
center of gravity of the area
D. remains unaffected

20. In open channel water flows under

A. force of gravity
B. atmospheric pressure
C. hydrostatic pressure
D. mechanical pressure

21. The pressure exerted onto a liquid is

transmitted undiminished to all
portions of the liquid. This principle
in fluid mechanics is attributed to:
A. Archimedes
B. Boyle
C. Torricelli
D. Pascal

22. In any stream flowing steadily without “Worry is a total waste

friction, the total energy contained is
the same at every point in its path of
of time. It doesn’t
flow. This principle is attributed to: change anything. All it
A. Torricelli
B. Bernoulli does is steal your joy
C. Pascal
D. Boyle and keep you busy doing
nothing.”
This review material is exclusively for the personal use, viewing and downloading of Review Innovations’ reviewees. Unauthorized
reproduction, use, or dissemination is strictly prohibited and shall be prosecuted to the full extent of the law.