Civil Engineering GATE 2014 Set-2 Questions with Answer

Ques 14 Environmental Engineering

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 Environmental Engineering

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 Environmental Engineering

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 N_t = N_oe^-0.145t where N_t = number of micro-organisms surviving at time t (in min.) and N_o = 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 Environmental Engineering

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 Environmental Engineering

The dominating microorganisms in an activated sludge process reactor are

Ques 19 Environmental Engineering

The two air pollution control devices that are usually used to remove very fine particles from the flue gas are

Ques 20 Fluid Mechanics

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 Fluid Mechanics

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 Fluid Mechanics

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 Fluid Mechanics

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 Fluid Mechanics

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 General Aptitude

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 General Aptitude

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.