FLUID MECHANICS
INSTRUCTION: Select the correct answer for each of the following questions.
Mark only one answer for each item by shading the box corresponding to the
letter of your choice on the answer sheet provided.
MULTIPLE CHOICE
•
Situation 1:
1.
An amount of carbon tetrachloride having a mass of
500 kg and a volume of 0.315 m3 is placed in a
container.
Which of the following most nearly gives the weight of carbon
tetrachloride?
a.
4.90 kN
c.
5.16 kN
b.
5.36 kN
d.
3.86 kN
2.
Which of the following most nearly gives the mass density of
carbon tetrachloride?
a.
1785.30 kg/m3 c.
1758.30 kg/m3
b.
1578.30 kg/m3 d.
1587.30 kg/m3
3.
Which of the following most nearly gives the unit weight of carbon
tetrachloride?
a.
12.25 kN/m3
c.
17.02 kN/m3
b.
16.38 kN/m3
d.
15.57 kN/m3
•
4.
11.
Which of the following most nearly gives the hydrostatic force
acting in the plate?
a.
2604.72 kN
c.
2460.27 kN
b.
2640.27 kN
d.
2406.72 kN
12.
Which of the following most nearly gives the location of the
hydrostatic force from the top surface of the liquid?
a.
8.69 m
c.
7.68 m
b.
9.68 m
d.
6.81 m
FLUID PROPERTIES
Situation 4:
HYDROSTATIC PRESSURE
Assuming specific weight of air to be constant at 12 N/m3, what is
the approximate height of Mt. Banahaw if a mercury barometer at
the base of the mountain reads 654 mm and at the same time
another mercury barometer at the top of the mountain reads 480
mm?
13.
a.
b.
5.
6.
•
1835.62 m
1602.19 m
c.
d.
1748.03 m
1934.53 m
A tank contains oil with specific gravity of 0.80, gasoline with
specific gravity of 0.90, and sea water with specific gravity of 1.05.
What is the pressure at a depth of 1.20 m if the depths of the
liquids are 0.50 m, 0.60 m, and 0.80 m, respectively?
a.
1812 kg/m2
c.
942 kg/m2
b.
1045 kg/m2
d.
1318 kg/m2
14.
Hydrostatic force
a.
2,354.4 kN
b.
2,543.4 kN
c.
d.
784.8 kN
874.8 kN
̅𝒚
a.
b.
c.
d.
6.75m
8.44m
Situation 5:
From the figure shown.
HYDROSTATIC FORCES
The tank is shown below.
15.
Hydrostatic force along the horizontal direction.
a.
1,764 lb
c.
3,121 lb
b.
1,123 lb
d.
1,467 lb
16.
Hydrostatic force along the vertical direction.
a.
1,764 lb
c.
b.
1,123 lb
d.
17.
8.
7.56m
4.48m
A pressure gage at elevation 10 m at the side of a tank containing
a liquid reads 80 kPa. Another gage at elevation 4 m reads 120
kPa. Find the specific gravity of the liquid.
a.
0.62
b.
0.65
b.
0.73
d.
0.68
Situation 2:
7.
From the figure shown, determine the following:
Which of the following most nearly gives the hydrostatic force
acting in liquid 1?
a.
274.68 kN
c.
247.86 kN
b.
472.68 kN
d.
427.86 kN
Which of the following most nearly gives the hydrostatic force
acting in liquid 2?
a.
705.456 kN
c.
750.465 kN
b.
349.78 kN
d.
427.86 kN
9.
Which of the following most nearly gives the hydrostatic force
acting in liquid 3?
a.
1758.24 kN
c.
247.86 kN
b.
472.68 kN
d.
1785.42 kN
10.
Which of the following most nearly gives the location of the total
hydrostatic force from the bottom of the tank?
a.
4.56 m
c.
3.36 m
b.
5.46 m
d.
6.63 m
Situation 3:
The parabolic plate is submerged in water as shown.
•
3,121 lb
1,467 lb
Location of the vertical component horizontally from B.
a.
3.56 ft.
c.
2.75 ft.
b.
4.48 ft.
d.
2.55 ft.
BUOYANCY
Situation 6:
A stone weighs 468 N in air. When submerged in
water it weighs 298 N.
18.
Which of the following most nearly gives the volume of the stone?
a.
0.0015 m3
c.
0.0254 m3
b.
0.0173 m3
d.
0.0357 m3
19.
Which of the following most nearly gives the unit weight of the
stone?
a.
24.03 kN/m3
c.
25.00 kN/m3
b.
26.00 kN/m3
d.
27.05 kN/m3
20.
Which of the following most nearly gives the specific gravity of the
stone?
a.
2.90
c.
2.25
b.
2.45
d.
2.76
Situation 7:
21.
A cylindrical tank 1 m in diameter and 3 m tall weighs
3.86 N.
Which of the following most nearly gives the weight of the lead
(specific wt.= 110 kN/m3) that must be placed inside the tank to
make the tank float vertically with 2.50 m submerged in water?
a.
16.91 kN
c.
19.25 kN
b.
21.14 kN
d.
b.
15.40 kN
22.
Which of the following most nearly gives the weight of the lead
(specific wt.= 110 kN/m3) that must be fastened to the outside
bottom of the tank to make the tank float vertically with 2.50 m
submerged in water?
a.
21.14 kN
c.
15.40 kN
b.
19.25 kN
d.
16.91 kN
23.
Which of the following most nearly gives the weight of the lead
(specific wt.= 110 kN/m3) that must be placed inside the tank to
make the top of the tank flushed with the water surface?
a.
19.25 kN
c.
16.91 kN
b.
15.40 kN
d.
21.14 kN
24.
A wooden block is placed horizontally in the sea with oil spill as
shown. What is the depth o f the block submerged?
Situation 10:
625 N
d.
950 N
Given is the truss as shown in figure ATJL 23.56.
c.
32.
33.
How many are zero – force members?
a.
5
c.
b.
4
d.
7
6
How many are load-carrying members?
a.
5
c.
b.
4
d.
7
6
Situation 12:
a.
b.
2.34 m
2.89 m
c.
d.
Given is the truss as shown in figure ZGE 9.1.
1.95 m
2.23 m
MOVING VESSELS
34.
•
VERTICAL TRANSLATION
Situation 8:
25.
Which of the following most nearly gives the pressure at the
bottom if acceleration is 0 m/s2?
a.
19.62 kPa
c.
161.796 kPa
b.
113.796 kPa
d.
65.796 kPa
26.
Which of the following most nearly gives the pressure at the
bottom if an upward acceleration of 5 m/s2 is applied to the tank?
a.
19.62 kPa
c.
161.796 kPa
b.
113.796 kPa
d.
65.796 kPa
27.
Which of the following most nearly gives the pressure at the
bottom if a downward acceleration of 5 m/s 2 is applied to the
tank?
a.
19.62 kPa
c.
161.796 kPa
b.
113.796 kPa
d.
65.796 kPa
28.
Which of the following most nearly gives the pressure at the
bottom if the tank experienced a free fall?
a.
19.62 kPa
c.
161.796 kPa
b.
113.796 kPa
d.
65.796 kPa
ENGINEERING MECHANICS
29.
30.
See figure FDDW 11.23.
At what angle must the 400-N force be applied in order that the
resultant R of the two forces has a magnitude of 1000 N?
a.
38.68°
c.
71.81°
b.
51.32°
d.
18.19°
What will be the angle between R and the horizontal?
a.
38.68°
c.
71.81°
b.
51.32°
d.
18.19°
31.
a.
7
6
How many are load-carrying members?
a.
15
c.
b.
14
d.
17
16
A tank is shown below.
35.
Situation 9:
How many are zero – force members?
a.
5
c.
b.
4
d.
What is the horizontal component of the resultant?
312 N
c.
781 N