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Civil Engineering GATE 2015 Set-1 Questions with Answer

Ques 40 Geotechnical Engineering

Which of the following statements is NOT correct?

A

Loose sand exhibits contractive behavior upon shearing.

B

Dense sand when sheared under undrained condition, may lead to generation of negative pore pressure.

C

Black cotton soil exhibits expansive behavior.

D

Liquefaction is the phenomenon where cohesionless soil near the downstream side of dams or sheet-piles loses its shear strength due to high upward hydraulic gradient.



Ques 41 Geotechnical Engineering

An earth embankment is to be constructed with compacted cohesionless soil. The volume of the embankment is 5000 m3 and the target dry unit weight is 16.2 kN/m3. Three nearby sites (see figure below) have been identified from where the required soil can be transported to the construction site. The void ratios (e) of different sites are shown in the figure. Assume the specific gravity of soil to be 2.7 for all three sites. If the cost of transportation per km is twice the cost of excavation per m3 of borrow pits, which site would you choose as the most economic solution? (Use unit weight of water = 10 kN/m3)

A

Site X

B

Site Y

C

Site Z

D

Any of the sites



Ques 42 Geotechnical Engineering

A water tank is to be constructed on the soil deposit shown in the figure below. A circular footing of diameter 3 m and depth of embedment 1 m has been designed to support the tank. The total vertical load to be taken by the footing is 1500 kN. Assume the unit weight of water as 10 kN/m3 and the load dispersion pattern as 2V:1H. The expected settlement of the tank due to primary consolidation of the clay layer is _______ mm.


52.5 is the correct answer.


Ques 43 Geotechnical Engineering

A 20 m thick clay layer is sandwiched between a silty sand layer and a gravelly sand layer. The layer experiences 30 mm settlement in 2 years.

where Tv is the time factor and U is the degree of consolidation in %. If the coefficient of consolidation of the layer is 0.003 cm2/s, the deposit will experience a total of 50 mm settlement in the next _______ years.


4.44 is the correct answer.


Ques 44 Geotechnical Engineering

A non-homogeneous soil deposit consists of a silt layer sandwiched between a fine-sand layer at top and a clay layer below. Permeability of the silt layer is 10 times the permeability of the clay layer and one-tenth of the permeability of the sand layer. Thickness of the silt layer is 2 times the thickness of the sand layer and two-third of the thickness of the clay layer. The ratio of equivalent horizontal and equivalent vertical permeability of the deposit is _______.


10.9 is the correct answer.


Ques 45 Geotechnical Engineering

A square footing (2 m x 2 m) is subjected to an inclined point load, P as shown in the figure below. The water table is located well below the base of the footing. Considering one-way eccentricity, the net safe load carrying capacity of the footing for a factor of safety of 3.0 is _______ kN.
The following factors may be used:
Bearing capacity factors: Nq = 33.3, Nγ = 37.16; Shape factors: Fqs = Fγs = 1.314; Depth factors: Fqd = Fγd = 1.113; Inclination factors: Fqi = 0.444, Fγi = 0.02


439.15 is the correct answer.


Ques 46 Hydrology

The two columns below show some parameters and their possible values.

Which of the following options matches the parameters and the values correctly?

A

P-I, Q-II, R-III, S-IV

B

P-III, Q-VI, R-I, S-V

C

P-I, Q-V, R-VI, S-II

D

P-III, Q-II, R-V, S-IV



Ques 47 Hydrology

In a catchment, there are four rain-gauge stations, P, Q, R, and S. Normal annual precipitation values at these stations are 780 mm, 850 mm, 920 mm, and 980 mm, respectively. In the year 2013, stations Q, R, and S, were operative but P was not. Using the normal ratio method, the precipitation at station P for the year 2013 has been estimated as 860 mm. If the observed precipitation at stations Q and R for the year 2013 were 930 mm and 1010 mm, respectively; what was the observed precipitation (in mm) at station S for that year?


1093.33 is the correct answer.


Ques 48 Hydrology

The 4-hr unit hydrograph for a catchment is given in the table below. What would be the maximum ordinate of the S-curve (in m3/s) derived from this hydrograph?


22 is the correct answer.


Ques 49 Structural Engineering

Consider the singly reinforced beam shown in the figure below:

At cross-section XX, which of the following statements is TRUE at the limit state?

A

The variation of stress is linear and that of strain is non-linear.

B

The variation of strain is linear and that of stress is non-linear.

C

The variation of both stress and strain is linear.

D

The variation of both stress and strain is non-linear.



Ques 50 Structural Engineering

For the beam shown below, the stiffness coefficient K22 can be written as ____________ kN-m.


5 is the correct answer.


Ques 51 Structural Engineering

The development length of a deformed reinforcement bar can be expressed as (1 / k)(Φσs / τbd). From the IS: 456-2000, the value of k can be calculated as _______.


6.38 to 6.42 is the correct answer.


Ques 52 Structural Engineering

Two triangular wedges are glued together as shown in the following figure. The stress acting normal to the interface, σn is _______ MPa.


0 is the correct answer.


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