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Civil Engineering GATE 2019 Set-2 Questions with Answer
Ques 40 Civil
The critical bending compressive stress in the extreme fibre of a structural steel section is 1000 MPa. It is given that the yield strength of the steel is 250 MPa, width of flange is 250 mm and thickness of flange is 15 mm. As per the provisions of IS:800-2007, the non-dimensional slenderness ratio of the steel cross-section is
Ques 41 Civil
In the context of provisions relating to durability of concrete, consider the following assertions:
Assertion (1): As per IS 456-2000, air entrainment to the extent of 3% to 6% is required for concrete exposed to marine environment.
Assertion (2): The equivalent alkali content (in terms of Na2O equivalent) for a cement containing 1% and 0.6% of Na2O and K2O, respectively, is approximately 1.4% (rounded to 1 decimal place).
Which one of the following statements is CORRECT?
Ques 42 Civil
Chlorine is used as the disinfectant in a municipal water treatment plant. It achieves 50 percent of disinfection efficiency measured in terms of killing the indicator microorganisms (E-Coli) in 3 minutes. The minimum time required to achieve 99 percent disinfection efficiency would be
Ques 43 Civil
A camera with a focal length of 20 cm fitted in an aircraft is used for taking vertical aerial photographs of a terrain. The average elevation of the terrain is 1200 m above mean sea level (MSL). What is the height above MSL at which an aircraft must fly in order to get the aerial photographs at a scale of 1:8000?
Ques 44 Civil
A flexible pavement has the following class of loads during a particular hour of the day.
i. 80 buses with 2-axles (each axle load of 40 kN);
ii. 160 trucks with 2-axles (front and rear axle loads of 40 kN and 80 kN, respectively).
The equivalent standard axle load repetitions for this vehicle combination as per IRC:37-2012 would be
Ques 45 Civil

Ques 46 Civil
A long uniformly distributed load of 10 kN/m and a concentrated load of 60 kN are moving together on the beam ABCD shown in the figure (not drawn to scale). The relative positions of the two loads are not fixed. The maximum shear force (in kN, round off to the nearest integer) caused at the internal hinge B due to the two loads is _______.

70 to 70 or -70 to -70 is the correct answer.
Ques 47 Civil
A plane frame shown in the figure (not to scale) has linear elastic springs at node H. The spring constants are kx = ky = 5 × 105 kN/m and kθ = 3 × 105 kNm/rad.

0.005 to 0.007 is the correct answer.
Ques 48 Civil
A rolled I-section beam is supported on a 75 mm wide bearing plate as shown in the figure. The thicknesses of the flange and web of the I-section are 20 mm and 8 mm, respectively. The root radius of the I-section is 10 mm. Assume: material yield stress, fy = 250 MPa and partial safety factor for material, γmo = 1.10.

272.60 to 272.80 is the correct answer.
Ques 49 Civil
When a specimen of M25 concrete is loaded to a stress level of 12.5 MPa, a strain of 500 × 10-6 is recorded. If this load is allowed to stand for a long time, the strain increases to 1000 × 10-6. In accordance with the provisions of IS:456-2000, considering the long-term effects, the effective modulus of elasticity of the concrete (in MPa) is _______.
12500 to 12500 is the correct answer.
Ques 50 Civil
A water treatment plant treats 6000 m3 of water per day. As a part of the treatment process, discrete particles are required to be settled in a clarifier. A column test indicates that an overflow rate of 1.5 m per hour would produce the desired removal of particles through settling in the clarifier having a depth of 3.0 m. The volume of the required clarifier (in m3, round off to 1 decimal place) would be _______.
495.0 to 505.0 is the correct answer.
Ques 51 Civil
Raw municipal solid waste (MSW) collected from a city contains 70% decomposable material that can be converted to methane. The water content of the decomposable material is 35%. An elemental analysis of the decomposable material yields the following mass percent: C:H:O:N:other = 44:6:43:0.8:6.2.
The methane production of the decomposable material is governed by the following stoichiometric relation:
CaHbOcNd + nH2O → mCH4 + sCO2 + dNH3
Given atomic weights: C = 12, H = 1, O = 16, N = 14.
The mass of methane produced (in grams, round off to 1 decimal place) per kg of raw MSW will be _______.
135.0 to 140.0 is the correct answer.
Ques 52 Civil
Consider the reactor shown in the figure. The flow rate through the reactor is Q m3/h. The concentrations (in mg/L) of a compound in the influent and effluent are C0 and C, respectively. The compound is degraded in the reactor following the first-order reaction. The mixing condition of the reactor can be varied such that the reactor becomes either a completely mixed flow reactor (CMFR) or a plug-flow reactor (PFR). The length of the reactor can be adjusted in these two mixing conditions to LCMFR and LPFR while keeping the cross-section of the reactor constant. Assuming steady state and for C/C0 = 0.8, the value of LCMFR / LPFR (round off to 2 decimal places) is _______.

1.10 to 1.15 is the correct answer.

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