Civil Engineering GATE 2022 Set-1 Questions with Answer

Ques 53 Civil

A raft foundation of 30 m × 25 m is proposed to be constructed at a depth of 8 m in a sand layer. A 25 m thick saturated clay layer exists 2 m below the base of the raft foundation. Below the clay layer, a dense sand layer exists at the site. A 25 mm thick undisturbed sample was collected from the mid-depth of the clay layer and tested in a laboratory oedometer under double drainage condition. It was found that the soil sample had undergone 50% consolidation settlement in 10 minutes.
The time (in days) required for 25% consolidation settlement of the raft foundation will be _______. (round off to the nearest integer)

Ques 54 Civil

A two-hour duration storm event with uniform excess rainfall of 3 cm occurred on a watershed.

Ques 55 Civil

Two reservoirs are connected by two parallel pipes of equal length and of diameters 20 cm and 10 cm, as shown in the figure (not drawn to scale). When the difference in the water levels of the reservoirs is 5 m, the ratio of discharge in the larger diameter pipe to the discharge in the smaller diameter pipe is _______. (round off to two decimal places) (Consider only loss due to friction and neglect all other losses. Assume the friction factor to be the same for both the pipes)

Ques 56 Civil

Depth of water flowing in a 3 m wide rectangular channel is 2 m. The channel carries a discharge of 12 m³/s. Take g = 9.8 m/s². The bed width (in m) at the contraction, which just causes critical flow, is _______ without changing the upstream water level. (round off to two decimal places)

Ques 57 Civil

A wastewater sample contains two nitrogen species, namely ammonia and nitrate. Consider the atomic weight of N, H, and O as 14 g/mol, 1 g/mol, and 16 g/mol respectively. In this wastewater, the concentration of ammonia is 34 mg NH₃/liter and that of nitrate is 6.2 mg NO₃-/liter. The total nitrogen concentration in this wastewater is _______ milligram nitrogen per liter. (round off to one decimal place)

Ques 58 Civil

A 2% sewage sample (in distilled water) was incubated for 3 days at 27°C temperature. After incubation, a dissolved oxygen depletion of 10 mg/L was recorded. The biochemical oxygen demand (BOD) rate constant at 27°C was found to be 0.23 day^-1 (at base e). The ultimate BOD (in mg/L) of the sewage will be _______. (round off to the nearest integer)

Ques 59 Civil

A water treatment plant has a sedimentation basin of depth 3 m, width 5 m, and length 40 m. The water inflow rate is 500 m³/h. The removal fraction of particles having a settling velocity of 1.0 m/h is _______. (round off to one decimal place) (Consider the particle density as 2650 kg/m³ and liquid density as 991 kg/m³)

Ques 60 Civil

A two-phase signalized intersection is designed with a cycle time of 100 s. The amber and red times for each phase are 4 s and 50 s, respectively. If the total lost time per phase due to start-up and clearance is 2 s, the effective green time of each phase is _______ s. (in integer)

Ques 61 Civil

At a traffic intersection, cars and buses arrive randomly according to independent Poisson processes at an average rate of 4 vehicles per hour and 2 vehicles per hour, respectively. The probability of observing at least 2 vehicles in 30 minutes is _______. (round off to two decimal places)

Ques 62 Civil

The vehicle count obtained in every 10 minute interval of a traffic volume survey done in peak one hour is given below.

Ques 63 Civil

For the dual-wheel carrying assembly shown in the figure, P is the load on each wheel, a is the radius of the contact area of the wheel, s is the spacing between the wheels, and d is the clear distance between the wheels. Assuming that the ground is an elastic, homogeneous, and isotropic half space, the ratio of Equivalent Single Wheel Load (ESWL) at depth z = d/2 to the ESWL at depth z = 2s is _______. (round off to one decimal place) (Consider the influence angle to be 45° for the linear dispersion of stress with depth)