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All questions of Three-phase System and Phase Relationships for Civil Engineering (CE) Exam
A soil mass in a three-phase system consists of ______- a)solids, water and air
- b)sand, gravel and air
- c)solids and water only
- d)solids and air only
Correct answer is option 'A'. Can you explain this answer?
A soil mass in a three-phase system consists of ______
a)
solids, water and air
b)
sand, gravel and air
c)
solids and water only
d)
solids and air only
|
Tanvi Shah answered |
Solids and water, solids and air are two-phase systems. Sand, gravel and air are not the phases. Solids, water and air are considered to be a three-phase system of the soil mass.
A soil sample weighs 190kN. After oven drying it weighs 150kN. What will be the weight of Water before oven drying?- a)35 kN
- b)40 kN
- c)30 kN
- d)45 kN
Correct answer is option 'B'. Can you explain this answer?
A soil sample weighs 190kN. After oven drying it weighs 150kN. What will be the weight of Water before oven drying?
a)
35 kN
b)
40 kN
c)
30 kN
d)
45 kN
|
|
Tanvi Shah answered |
Given,
Weight of soil sample W = 190kN
Weight after oven drying Wd = 150kN
Weight of Water WW = W - Wd
WW = 190 - 150
WW = 40kN.
Weight of soil sample W = 190kN
Weight after oven drying Wd = 150kN
Weight of Water WW = W - Wd
WW = 190 - 150
WW = 40kN.
In the phase diagram, volumes are represented on the ________- a)left side
- b)right side
- c)top
- d)bottom
Correct answer is option 'A'. Can you explain this answer?
In the phase diagram, volumes are represented on the ________
a)
left side
b)
right side
c)
top
d)
bottom
|
|
Tanvi Shah answered |
Volumes are represented on the left side whereas weights are represented on the right side of the block diagram.
The weight of solids is represented as _______- a)Wd
- b)WW
- c)Wa
- d)W
Correct answer is option 'A'. Can you explain this answer?
The weight of solids is represented as _______
a)
Wd
b)
WW
c)
Wa
d)
W
|
|
Tanvi Shah answered |
The weights of Water, air and total weight are represented as WW, Wa and W. The weight of solids is represented as Wd or WS in the phase diagram.
The phase diagram is also known as _______- a)soil grain diagram
- b)block diagram
- c)constituents diagram
- d)element diagram
Correct answer is option 'B'. Can you explain this answer?
The phase diagram is also known as _______
a)
soil grain diagram
b)
block diagram
c)
constituents diagram
d)
element diagram
|
|
Tanvi Shah answered |
It is always convenient to show the constituents occupying separate spaces as blocks. In the phase diagram, the soil occupies the bottom position. Water and air occupy the middle and top positions.
The total weight of the moist sample is the sum of _______- a)WW + Wd
- b)Wa + WW
- c)Wa + Wd
- d)Wv
Correct answer is option 'A'. Can you explain this answer?
The total weight of the moist sample is the sum of _______
a)
WW + Wd
b)
Wa + WW
c)
Wa + Wd
d)
Wv
|
|
Tanvi Shah answered |
The sum of the weight of voids Wv and weight of solid is the total weight. The weight of total voids is equal to the weight of Water and weight of air. Since the weight of air is considered to be negligible, the weight of total voids is equal to the weight of Water. Therefore, the total weight of the moist sample is the sum of WW + Wd.
In wet soil mass, air occupies one-seventh of its volume and Water occupies one- eighth of its volume. What will be the ratio of volume of voids with respect to the total volume?- a)0.329
- b)0.279
- c)0.432
- d)0.286
Correct answer is option 'D'. Can you explain this answer?
In wet soil mass, air occupies one-seventh of its volume and Water occupies one- eighth of its volume. What will be the ratio of volume of voids with respect to the total volume?
a)
0.329
b)
0.279
c)
0.432
d)
0.286
|
|
Tanvi Shah answered |
Given,
Volume of Water Va = (1/7) total volume V
Volume of Water VW = (1/8) total volume V
Volume of voids Vv = Va + VW
Vv = (1/7)V+(1/8)V
Vv = (15/56)V = 0.268V.
Volume of Water Va = (1/7) total volume V
Volume of Water VW = (1/8) total volume V
Volume of voids Vv = Va + VW
Vv = (1/7)V+(1/8)V
Vv = (15/56)V = 0.268V.
The volume of voids Vv is equal to the sum of ______- a)the volume of air and volume of solids
- b)the volume of air and volume of water
- c)the volume of water and volume of solids
- d)the volume of water and the weight of water
Correct answer is option 'B'. Can you explain this answer?
The volume of voids Vv is equal to the sum of ______
a)
the volume of air and volume of solids
b)
the volume of air and volume of water
c)
the volume of water and volume of solids
d)
the volume of water and the weight of water
|
|
Tanvi Shah answered |
The voids in soil mass are occupied by air and water. Hence, the volume of voids equals to the volume of air and volume of water.
For a fully saturated soil sample, the volume of voids is equal to _______- a)volume of air
- b)volume of water
- c)the volume of air and volume of water
- d)the volume of water and volume of solids
Correct answer is option 'B'. Can you explain this answer?
For a fully saturated soil sample, the volume of voids is equal to _______
a)
volume of air
b)
volume of water
c)
the volume of air and volume of water
d)
the volume of water and volume of solids
|
|
Tanvi Shah answered |
In a fully saturated sample, the volume of voids gets completely filled by water leaving no air voids present in the sample. Hence, volume of voids equals the volume of water.
The volume of solids is represented as _______ in the phase diagram.- a)Vv
- b)VW
- c)VS
- d)Va
Correct answer is option 'C'. Can you explain this answer?
The volume of solids is represented as _______ in the phase diagram.
a)
Vv
b)
VW
c)
VS
d)
Va
|
|
Tanvi Shah answered |
The volume of voids, water and air are represented as Vv, VW and Va. The volume of solids is represented as Vd or VS in the phase diagram.
Chapter doubts & questions for Three-phase System and Phase Relationships - Soil Mechanics 2025 is part of Civil Engineering (CE) exam preparation. The chapters have been prepared according to the Civil Engineering (CE) exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for Civil Engineering (CE) 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.
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