Q1.A 2 km pipe of 0.2 m diameter connects two reservoirs. The difference between
the water levels in the reservoir is 8 m. The Darcy Weisbach friction factor of the
pipe is 0.04. Accounting for frictional entry and exit losses, the velocity in the
pipe in (m/sec) is
Q2.A settling tank is designed for a surface overflow rate of Assuming
specific gravity of sediment particles = 2.65, Density of water, rw = 1000 kg / m3, dynamic viscosity of water mwater = 0.001 Ns / m2 and stokes law is valid.
The approximate minimum size of particles which can be completely removed is
Answer : Option BExplaination / Solution:
To calculate minimum size of particles equating settling velocity to overflow rate,
we get
Q3. The transplantation of rice requires 10 days and total depth of water required
during transplantation is 48 cm. During transplantation there is an effective
rainfall (useful for irrigation) of 8 cm. The duty of irrigation water in hectare/
cumecs is
Q4.A multistorey building with a basement is to be constructed. The top 4 m
contains loose silt below which dense sand layer is present upto a great depth.
Ground water table is at the ground surface. The foundation consists of the
basement slab of 6 m width which will rest on the top of dense sand as shown in
figure. For dense sand saturated unit weight is 3 20kN / m3 and bearing
capacity factor, Nq = 40, Nγ = 45, for loose silt saturated unit
weight = 18kN / m3 , Nq = 15, Nγ = 20 . Effective cohesion is 0. Neglect depth factor
average elastic modulus E, and Poisson ratio µ of dense sand is 60 ×102 kN / m2 and 0.3 respectively, using factor of safety = 3. (Take influence
factor = 2)
The net safe bearing capacity (in kN / m3) of foundation is
Q5.In a compaction test, G, w, S and e represent the specific gravity, water content, degree of saturation and void ratio of the soil sample, respectively. If γw represents the unit weight of water and γd represents the dry unit weight of the soil, the equation of zero air voids line is
Answer : Option BExplaination / Solution: No Explaination.
Q7.The flow in a rectangular channel is subcritical. If width of the channel is reduced
at a certain section, the water surface under no-choke condition will
Answer : Option AExplaination / Solution: No Explaination.
Q10.Consider the following unit processes commonly used in water treatment; rapid mixing (RM), flocculation (F), primary sedimentation (PS), secondary sedimentation (SS), chlorination (C) and rapid sand filtration (RSF). The order of these unit processes (first to last) in a conventional water treatment plant is
Answer : Option DExplaination / Solution: No Explaination.
Total Question/Mark :
Scored Mark :
Mark for Correct Answer : 1
Mark for Wrong Answer : -0.5
Mark for Left Answer : 0