Civil Engineering Gate Yearwise 

Civil Engineering Gate 2019 Set-1 Questions with Answer

Ques 53 GATE 2019 SET-1

If the section shown in the figure turns from fully-elastic to fully-plastic, the depth of neutral axis (N.A.), ȳ decreases by

A

10.75 mm

B

12.25 mm

C

13.75 mm

D

15.25 mm


(c) is the correct answer.

Ques 54 GATE 2019 SET-1

Sedimentation basin in a water treatment plant is designed for a flow rate of 0.2 m3/s. The basin is rectangular with a length of 32 m, width of 8 m, and depth of 4 m. Assume that the settling velocity of these particles is governed by Stokes' law. Given: density of the particles = 2.5 g/cm3; density of water = 1 g/cm3; dynamic viscosity of water = 0.01 g/(cm·s); gravitational acceleration = 980 cm/s2. If the incoming water contains particles of diameter 25 μm (spherical and uniform), the removal efficiency of these particles is

A

51%

B

65%

C

78%

D

100%


(b) is the correct answer.

Ques 55 GATE 2019 SET-1

A survey line was measured to be 285.5 m with a tape having a nominal length of 30 m. On checking, the true length of the tape was found to be 0.05 m too short. If the line lay on a slope of 1 in 10, the reduced length (horizontal length) of the line for plotting of survey work would be

A

283.6 m

B

284.5 m

C

285.0 m

D

285.6 m


(a) is the correct answer.

Ques 56 GATE 2019 SET-1

A 16 mm thick gusset plate is connected to the 12 mm thick flange plate of an I-section using fillet welds on both sides as shown in the figure (not drawn to scale). The gusset plate is subjected to a point load of 350 kN acting at a distance of 100 mm from the flange plate. Size of fillet weld is 10 mm.

The maximum resultant stress (in MPa, round off to 1 decimal place) on the fillet weld along the vertical plane would be _______.


(78.0 to 78.2 or 105.3 to 105.5) is the correct answer.

Ques 57 GATE 2019 SET-1

The network of a small construction project awarded to a contractor is shown in the following figure. The normal duration, crash duration, normal cost, and crash cost of all the activities are shown in the table. The indirect cost incurred by the contractor is INR 5000 per day.

If the project is targeted for completion in 16 days, the total cost (in INR) to be incurred by the contractor would be _______.


(149500 to 149500) is the correct answer.

Ques 58 GATE 2019 SET-1

A box measuring 50 cm × 50 cm × 50 cm is filled to the top with dry coarse aggregate of mass 187.5 kg. The water absorption and specific gravity of the aggregate are 0.5% and 2.5, respectively. The maximum quantity of water (in kg, round off to 2 decimal places) required to fill the box completely is _______.


(50.50 to 51.20) is the correct answer.

Ques 59 GATE 2019 SET-1

A portal frame shown in figure (not drawn to scale) has a hinge support at joint P and a roller support at joint R. A point load of 50 kN is acting at joint R in the horizontal direction. The flexural rigidity, EI, of each member is 106 kNm2. Under the applied load, the horizontal displacement (in mm, round off to 1 decimal place) of joint R would be _______.


(24.9 to 25.1) is the correct answer.

Ques 60 GATE 2019 SET-1

A sample of air analysed at 0°C and 1 atm pressure is reported to contain 0.02 ppm (parts per million) of NO2. Assume the gram molecular mass of NO2 as 46 and its volume at 0°C and 1 atm pressure as 22.4 litres per mole. The equivalent NO2 concentration (in microgram per cubic meter, round off to 2 decimal places) would be _______.


(41.00 to 41.10) is the correct answer.

Ques 61 GATE 2019 SET-1

A 0.80 m deep bed of sand filter (length 4 m and width 3 m) is made of uniform particles (diameter = 0.40 mm, specific gravity = 2.65, shape factor = 0.85) with bed porosity of 0.4. The bed has to be backwashed at a flow rate of 3.60 m3/min. During backwashing, if the terminal settling velocity of sand particles is 0.05 m/s, the expanded bed depth (in m, round off to 2 decimal places) is _______.


(1.15 to 1.25) is the correct answer.

Ques 62 GATE 2019 SET-1

A wastewater is to be disinfected with 35 mg/L of chlorine to obtain 99% kill of microorganisms. The number of microorganisms remaining alive (Nt) at time t, is modelled by Nt = N0e-kt, where N0 is number of microorganisms at t = 0, and k is the rate of kill. The wastewater flow rate is 36 m3/h, and k = 0.23 min-1. If the depth and width of the chlorination tank are 1.5 m and 1.0 m, respectively, the length of the tank (in m, round off to 2 decimal places) is _______.


(7.95 to 8.15) is the correct answer.

Ques 63 GATE 2019 SET-1

A staff is placed on a benchmark (BM) of reduced level (RL) 100.000 m and a theodolite is placed at a horizontal distance of 50 m from the BM to measure the vertical angles. The measured vertical angles from the horizontal at the staff readings of 0.400 m and 2.400 m are found to be the same. Taking the height of the instrument as 1.400 m, the RL (in m) of the theodolite station is _______.


(100 to 100) is the correct answer.

Ques 64 GATE 2019 SET-1

Consider the ordinary differential equation 2(d2y/dx2) - 2x(dy/dx) + 2y = 0. Given the values of y(1) = 0 and y(2) = 2, the value of y(3) (round off to 1 decimal place), is _______.


(5.9 to 6.1) is the correct answer.

Ques 65 GATE 2019 SET-1

Average free flow speed and the jam density observed on a road stretch are 60 km/h and 120 vehicles/km, respectively. For a linear speed-density relationship, the maximum flow on the road stretch (in vehicles/h) is _______.


(1800 to 1800) is the correct answer.

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