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Civil Engineering Gate 2014 Set-2 Questions with Answer
Ques 14 GATE 2014 SET-2
A suspension of sand like particles in water with particles of diameter 0.10 mm and below is flowing into a settling tank at 0.10 m3/s. Assume g = 9.81 m/s2, specific gravity of particles = 2.65, and kinematic viscosity of water = 1.0105 x 10-2 cm2/s. The minimum surface area (in m2) required for this settling tank to remove particles of size 0.06 mm and above with 100% efficiency is ______.
Ques 15 GATE 2014 SET-2
A surface water treatment plant operates round the clock with a flow rate of 35 m3/min. The water temperature is 15°C and jar testing indicated an alum dosage of 25 mg/l with flocculation at a Gt value of 4 x 104 producing optimal results. The alum quantity required for 30 days (in kg) of operation of the plant is ______.
Ques 16 GATE 2014 SET-2
An effluent at a flow rate of 2670 m3/d from a sewage treatment plant is to be disinfected. The laboratory data of disinfection studies with a chlorine dosage of 15 mg/l yield the model Nt = Noe-0.145t where Nt = number of micro-organisms surviving at time t (in min.) and No = number of micro-organisms present initially (at t = 0). The volume of disinfection unit (in m3) required to achieve a 98% kill of micro-organisms is ______.
Ques 17 GATE 2014 SET-2
A waste water stream (flow = 2 m3/s, ultimate BOD = 90 mg/l) is joining a small river (flow = 12 m3/s, ultimate BOD = 5 mg/l). Both water streams get mixed up instantaneously. Cross-sectional area of the river is 50 m2. Assuming the de-oxygenation rate constant, k = 0.25/day, the BOD (in mg/l) of the river water, 10 km downstream of the mixing point is ______.
Ques 18 GATE 2014 SET-2
The dominating microorganisms in an activated sludge process reactor are
Ques 19 GATE 2014 SET-2
The two air pollution control devices that are usually used to remove very fine particles from the flue gas are
Ques 20 GATE 2014 SET-2
A plane flow has velocity components u = (x/T1), v = (-y/T2) and w = 0 along x, y and z directions respectively, where T1(≠ 0) and T2(≠ 0) are constants having the dimension of time. The given flow is incompressible if
Ques 21 GATE 2014 SET-2
A horizontal nozzle of 30 mm diameter discharges a steady jet of water into the atmosphere at a rate of 15 litres per second. The diameter of inlet to the nozzle is 100 mm. The jet impinges normal to a flat stationary plate held close to the nozzle end. Neglecting air friction and considering the density of water as 1000 kg/m3, the force exerted by the jet (in N) on the plate is ______.
Ques 22 GATE 2014 SET-2
A venturimeter having a throat diameter of 0.1 m is used to estimate the flow rate of a horizontal pipe having a diameter of 0.2 m. For an observed pressure difference of 2 m of water head and coefficient of discharge equal to unity, assuming that the energy losses are negligible, the flow rate (in m3/s) through the pipe is approximately equal to ______.
Ques 23 GATE 2014 SET-2
A rectangular channel of 2.5 m width is carrying a discharge of 4 m3/s. Considering that acceleration due to gravity as 9.81 m/s2, the velocity of flow (in m/s) corresponding to the critical depth (at which the specific energy is minimum) is ______.
Ques 24 GATE 2014 SET-2
With reference to a standard Cartesian (x, y) plane, the parabolic velocity distribution profile of fully developed laminar flow in x-direction between two parallel, stationary and identical plates that are separated by distance, h, is given by the expression u = -(h2 / 8µ)(dp/dx)(1 - 4(y/h)2). In this equation, the y = 0 axis lies equidistant between the plates at a distance h/2 from the two plates, p is the pressure variable and µ is the dynamic viscosity term. The maximum and average velocities are, respectively ______.
Ques 25 GATE 2014 SET-2
Choose the most appropriate word from the options given below to complete the following sentence.
A person suffering from Alzheimer’s disease ______ short-term memory loss.
Ques 26 GATE 2014 SET-2
Choose the most appropriate word from the options given below to complete the following sentence.
______ is the key to their happiness; they are satisfied with what they have.
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