#100.
The moist weight of 0.2 ft3 of a soil is 23 lb. The moisture content and the specific gravity of soil solids determined in the laboratory to be 11 % and 2.7 respectively.What is the moist unit weight in lbs/ft3?
A
115 lbs/ft3
B
125 lbs/ft3
C
107 lbs/ft3
D
118 lbs/ft3
Answer: 115 lbs/ft3
#101.
The moist weight of 0.2 ft3 of a soil is 23 lb. The moisture content and the specific gravity of soil solids determined in the laboratory to be 11 % and 2.7 respectively. What is the dry unit weight in lbs/ft3?
A
102.36 lbs/ft3
B
113.25 lbs/ft3
C
103.62 lbs/ft3
D
105.22 lbs/ft3
Answer: 103.62 lbs/ft3
#102.
The moist weight of 0.2 ft3 of a soil is 23 lb. The moisture content and the specific gravity of soil solids determined in the laboratory to be 11 % and 2.7 respectively. What is the degree of saturation?
A
44.44%
B
57.04%
C
47.44%
D
48.23%
Answer: 47.44%
#103.
A specimen of sand has a porosity of 45% and the specific gravity of its solid is 2.71. Compute the specific weight of this solid in the submerged state.
A
8.32 kN/m3
B
9.92 kN/m3
C
8.44 kN/m3
D
9.23 kN/m3
Answer: 9.23 kN/m3
#104.
The mass of a sample of saturated soil is 520 grams. The dry mass, after oven drying is 05 grams. Calculate the effective unit weight of the soil mass if G = 2.7.
A
8.44 kN/m3
B
9.01 kN/m3
C
9.44 kN/m3
D
10.36 kN/m3
Answer: 9.44 kN/m3
#105.
A trapezoidal canal has a bottom width of 4 m and side slopes of 2 horizontal to 1 vertical. When the depth of flow is 1.2 m, the flow is 30 cumec. The roughness coefficient n =0.015. Evaluate the slope of the channel using Mannings formula.
A
0.0077
B
0.00321
C
0.00747
D
0.00447
Answer: 0.00447
#106.
When the path lines of the individual particles of a flowing liquid are irregular curves and continually cross each other and form a complicated network, the flow is called _________.
A
Turbulent
B
Continuous
C
Laminar
D
Uniform
Answer: Turbulent
#107.
An unconfined compression test was conducted on a sample clay having a diameter of 50 mm. The failure load was recorded at 240 N. Compute the cohesion strength of the clay.
A
60.42
B
65.11
C
61.10
D
60.01
Answer: 61.10
#108.
A soil sample has a water content of 20% and moist unit weight of 18 kN/m3. The specific gravity of the solid is 2.65. What is the void ratio of the soil?
A
0.73
B
0.71
C
0.70
D
0.67
Answer: 0.73
#109.
The perimeter in a falling head permeability test set up involves a cylindrical soil sample 50 mm diameter and a height 200 mm. The hydraulic head in the 10 mm diameter standpipe through which test water passed dropped from 900 to 600 mm in one minute of observation. In that duration, the water collected in the graduated flask was recorded at 1.5 liters. Evaluate the coefficient of permeability of the soil sample in cm/sec.
A
0.00621 cm/sec
B
0.00541 cm/sec
C
0.00441 cm/sec
D
0.00341 cm/sec
Answer: 0.00541 cm/sec
#110.
A hollow cylinder 1.0 m in diameter and 2.8 m long weighs 3.84 kN. Determine the weight of lead (unit weight = 110 kN/m3)must be fastened to the outside bottom to make the
cylinder float vertically with 2.3 m submerged in freshwater.
A
17.54
B
12.70
C
18.55
D
15.25
Answer: 15.25
#111.
A hollow cylinder 1.0 m in diameter and 2.8 m long weighs 3.84 kN. Determine the weight of lead that must be placed inside the cylinder to make the cylinder float vertically
with 2.3 m submerged in freshwater.
A
17.96
B
12.70
C
14.54
D
13.88
Answer: 13.88
#112.
A hollow cylinder 1.0 m in diameter and 2.8 m long weighs 3.84 kN. Calculate the additional load assuming the lead is placed inside the cylinder to make the top of the cylinder flushed with the water surface?
A
3.85 kN
B
5.70 kN
C
8.36 kN
D
7.33 kN
Answer: 3.85 kN
#113.
An open cylindrical tank having a radius of 0.30 m and a height of 1.20 m is filled with
water at a depth of 0.90 m. How fast will it be rotated about its vertical axis if half of its volume is spilled out?
A
191.54 rpm
B
178.34 rpm
C
156.21 rpm
D
145.84 rpm
Answer: 178.34 rpm
#114.
An open cylindrical tank having a radius of 0.30 m and a height of 1.20 m is filled with
water at a depth of 0.90 m. Find the speed of rotation about its vertical axis so that no water will be spilled out?
A
132.85 rpm
B
109.21 rpm
C
133.84 rpm
D
121.70 rpm
Answer: 109.21 rpm
#115.
An open cylindrical tank having a radius of 0.30 m and a height of 1.20 m is filled with
water at a depth of 0.90 m. Determine the speed of rotation about its vertical axis to produce zero pressure with 0.20 m from the
center of the tank.
A
207.22 rpm
B
198.56 rpm
C
211.45 rpm
D
222.75 rpm
Answer: 207.22 rpm
#116.
If \(12 m^2\) of nitrogen at \(30^{o} C\) and \(125 ~kPa\) absolute pressure is expanded isothermally to \(30\)
\(m^3\), use \(k = 1.40\) and constant \(= pV^k\) for an isentropic condition. Find the resulting pressure.
A
45 kPa
B
50 kPa
C
30 kPa
D
75 kPa
Answer: 50 kPa
#117.
If \(12 m^2\) of nitrogen at \(30^{o} C\) and \(125 ~kPa\) absolute pressure is expanded isothermally to \(30\)
\(m^3\), use \(k = 1.40\) and constant \(= pV^k\) for an isentropic condition. Find the pressure in an isentropic condition.
A
62.4 kPa
B
50 kPa
C
44.1 kPa
D
34.7 kPa
Answer: 34.7 kPa
#118.
If \(12 m^2\) of nitrogen at \(30^{o} C\) and \(125 ~kPa\) absolute pressure is expanded isothermally to \(30\)
\(m^3\), use \(k = 1.40\) and constant \(= pV^k\) for an isentropic condition. Find the temperature in an isentropic condition. Use \( \frac{T_2}{T_1} = (\frac{p_2}{p_1})^{(k-1)/k}\).
A
\(63^{o}C\)
B
\(-30^{o}C\)
C
\(30^{o}C\)
D
\(-63^{o}C\)
Answer: \(-63^{o}C\)
#119.
If \(12 m^2\) of nitrogen at \(30^{o} C\) and \(125 ~kPa\) absolute pressure is expanded isothermally to \(30\)
\(m^3\), use \(k = 1.40\) and constant \(= pV^k\) for an isentropic condition. If K = 2.2 GPa is the bulk modulus of elasticity of water, what pressure is required to reduce a volume
by 0.6 percent?