Assistant Professor / Lecturer • Paper-III
Pile foundations are suitable for
A)
water logged soils
B)
soft rocks
C)
compact soils
D)
multi-storey buildings
Pile foundations transfer load to deeper hard strata, ideal for water-logged soils where shallow bearing fails; also used for heavy multi-storey but primary option is water-logged soils.
Assistant Professor / Lecturer • Paper-III
With usual notations, the expression V^2/gR represents
A)
centrifugal force
B)
centripetal force
C)
superelevation
D)
radial acceleration.
V²/gR = centrifugal ratio = required superelevation e for equilibrium (with friction).
Assistant Professor / Lecturer • Paper-III
Which one of the following methods is generally adopted for tunneling in firm ground
A)
Full face method
B)
Top heading and benching method
C)
Drift method
D)
All of the above
In firm ground self-supporting, full face method excavates entire cross-section at once; economical and fast.
Assistant Professor / Lecturer • Paper-III
Plasticity Index is
A)
1/G + 1/e = i/c
B)
1/G - 1/e = i/c
C)
1/G - 1/e = i/c
D)
1/G + 1/e = i/c
Options contain erroneous formula (1/G+1/e). Correct definition is PI = Liquid Limit - Plastic Limit = WL-WP. Choosing A as placeholder; true PI = WL-WP.
Assistant Professor / Lecturer • Paper-III
The Phreatic line in a homogenous dam is
A)
Circular
B)
Elliptical
C)
Hyperbolic
D)
Parabolic
Phreatic line in homogeneous earth dam is a parabola (Kozeny's parabola).
Assistant Professor / Lecturer • Paper-III
Formation width of two lane pavement is
A)
7.5m
B)
7m
C)
12m
D)
9m
Two-lane carriageway is 7.5m; formation/roadway width including shoulders is 12m in plain terrain (9m in hilly). Exam expects 12m for formation.
Assistant Professor / Lecturer • Paper-III
The line of joining the points of equal altitude is called
A)
horizontal line
B)
contour interval
C)
contour
D)
vertical line
Line joining points of equal reduced level/elevation is contour.
Assistant Professor / Lecturer • Paper-III
For locating an inaccessible point with the help of only a Plane table, one should use
A)
resection
B)
radiation
C)
intersection
D)
traversing
Inaccessible point with plane table only is located by intersection from two known stations.
Assistant Professor / Lecturer • Paper-III
Dupit’s theory is used to find
A)
the co-efficient of permeability of soil
B)
shear strength of soil
C)
liquid limit of soil
D)
settlement of soil
Dupit's equation for unconfined aquifer used to determine permeability coefficient k.
Assistant Professor / Lecturer • Paper-III
The maximum width of a vehicle as recommended by IRC is
A)
1.85 m
B)
4.72 m
C)
3.81m
D)
2.44 m
IRC 3:1996 max width 2.44m, height 3.81m, length etc.
Assistant Professor / Lecturer • Paper-III
The maximum permissible differential settlement, in case of foundations in clayey soil, is usually limited to
A)
10 mm
B)
20 mm
C)
30 mm
D)
40 mm
As per IS 1904, max allowable differential settlement for isolated footings is 25mm in sand, 40mm in clay; total 40-65mm in clay.
Assistant Professor / Lecturer • Paper-III
Reaction time of driver
A)
decrease with increase in speed
B)
increase with increase in speed
C)
is same for all speeds
D)
None of these
Driver perception-reaction time ~2.5s, assumed constant irrespective of speed.
Assistant Professor / Lecturer • Paper-III
Match List I (Investigator) with List II (Equation) and select the correct answer using the codes given below the lists
List I: A. Skempton, B. Coulomb, C. Stokes, D. Terzaghi
List II: 1. V=Ki, 2. σ' = σ - u, 3. v = (D^2(ρs-ρw)r/18η), 4. S = C + σ tan φ, 5. σ1 = 1.3(σ3 + 2C) + ...
A)
A-4, B-5, C-3, D-2
B)
A-5, B-4, C-3, D-2
C)
A-4, B-5, C-1, D-3
D)
A-5, B-4, C-2, D-2
Coulomb S=C+σtanφ (4), Stokes v∝D² (3), Terzaghi σ'=σ-u (2), Skempton bearing (5).
Assistant Professor / Lecturer • Paper-III
A foundation is said to be shallow, if
A)
width of the foundation is more than depth of foundation
B)
width of the foundation is equal to depth of foundation
C)
width of the foundation is two time to depth of foundation
D)
width of the foundation is three time to depth of foundation
Shallow foundation if Df/B ≤1, i.e., width greater than depth.
Assistant Professor / Lecturer • Paper-III
The first reading made with the staff on a point of reduced level is called
A)
fore sight
B)
back sight
C)
intermediate sight
D)
reduced level
First staff reading after setting up level is back sight on known BM.
Assistant Professor / Lecturer • Paper-III
For 12mm thick cement plastering 1:6 on 100 sq.m new brick work, the quantity of cement required is
A)
0.200 m3
B)
0.247 m3
C)
0.274 m3
D)
0.295 m3
Volume 100*0.012=1.2m³ wet, dry ~1.54 factor → cement = dry/7 ≈0.24-0.25m³.
Assistant Professor / Lecturer • Paper-III
An ideal transition curve is
A)
cubic parabola
B)
cubic spiral
C)
clothoid spiral
D)
true spiral
Ideal transition is clothoid (Euler) spiral where radius ∝ 1/length.
Assistant Professor / Lecturer • Paper-III
Forepoling method is generally adopted for tunneling in
A)
soft ground
B)
firm ground
C)
running ground
D)
none of these
Forepoling is old method of driving poles ahead in running/loose ground for sewers at shallow depth.
Assistant Professor / Lecturer • Paper-III
The thickness design of the pavement, is decided on the load carried by
A)
main gears
B)
nose wheel
C)
tail wheel
D)
All of the above
Airport pavement thickness governed by main landing gears carrying ~95% load.
Assistant Professor / Lecturer • Paper-III
The most accurate method for the determination of water content in the laboratory is
A)
Sand bath method
B)
Pycnometer method
C)
Calcium carbide method
D)
Oven drying method
Oven drying at 105°C to constant mass is reference most accurate lab method for water content.
Assistant Professor / Lecturer • Paper-III
Coning of wheels is provided at
A)
to check lateral movement of the wheels
B)
to avoid damage to inner faces of rails
C)
to avoid discomfort to passengers
D)
All of the above
Coning at 1 in 20 prevents lateral slip, reduces rail wear, improves riding.
Assistant Professor / Lecturer • Paper-III
The performance of a specific task in CPM, is known as
A)
Dummy
B)
Event
C)
Activity
D)
Contract
In CPM/PERT, accomplishment of task is Activity, while start/end point is Event; Dummy is zero-duration dependency.
Assistant Professor / Lecturer • Paper-III
The purpose of cross- drainage is
A)
to divert the hill side water to valley side
B)
to provide side drain
C)
to make the drainage stable
D)
all the above
Cross-drainage structures (culverts) divert hillside runoff to valley side to protect hill roads.
Assistant Professor / Lecturer • Paper-III
If the stopping distance is 60 metres, then the minimum stopping sight distance for two lane, two way traffic is
A)
60m
B)
30m
C)
120 m
D)
170m
For 2-lane 2-way SSD = stopping distance =60m; for single lane 2-way it would be 2*SD=120m.
Assistant Professor / Lecturer • Paper-III
Afflux is
A)
Freeboard
B)
Vertical clearance
C)
Rise of water level
D)
Scour
Afflux is the rise of water level on upstream side due to constriction under bridge.
