QUESTIONS CARRY ONE MARK EACH.
For a highway, with design speed of 100 kmph, the safe OSD is (acceleration, a = 0.53 m/s2)
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Solution
QUESTIONS CARRY ONE MARK EACH.
The cumilative noise power distribution curve at a certain location is given below.
The value of L40 is equal to
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Solution
QUESTIONS CARRY ONE MARK EACH.
An activated sludge aeration tank (length = 30 m, width =14 m, effective depth = 4.3m) has a flow of 0.0796 m3 and soluble BOD5 after primary settling 130 mg/l. Determine the aeration period.
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Solution
QUESTIONS CARRY ONE MARK EACH.
The theorotical oxygen demand of 0.001 mol/L glucose solution is
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Solution
Glucose in C6H12O6
C6H12O6 + 6O2 → 6CO2+ 6H2O
(180) (192) ← Molecular weight
∴ for 180 parts of glucose, 192 parts of O2 is needed.
0.001 moles/l of glucose
0.001 × 180 × 1000 = 180 mg/l
∴ It requires 192 mg/l O2
QUESTIONS CARRY ONE MARK EACH.
If duty (D) is 1726 hectam percumec and base period is 135 days for an irrigated crop then delta in m is given by _____.
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Solution
Δ= 8.64 × B⁄D
= \(8.64\times \frac{135}{1726}\)
= 0.676 m
QUESTIONS CARRY ONE MARK EACH.
A Trapezoidal channel with bottom width of 3m and sides loped 1V : 1.5H carries a discharge of 8m3/s with the flow depth of 1.5m. The Froude number of flow is _________ .
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Solution
QUESTIONS CARRY ONE MARK EACH.
The height of hydraulic jump in the stilling of 1:25 scale model was observed to be 10cm. The corresponding prototype height of jump is _________ .
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Solution
QUESTIONS CARRY ONE MARK EACH.
A point load of 700 kN is applied on the surface of thick layer of saturated clay. Closing Boussinesq’s elastic analysis, the estimated vertical stress (σv) at a depth of 2m and a radial distance of 1m from the point of application of load is __________ .
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Solution
QUESTIONS CARRY ONE MARK EACH.
A pile of 0.5 m diameter and length 10m is embedded in a deposit of clay. The undrained strength parameters of clay are cohesion = 60 kN/m2 and the angle in internal friction=0. The skin friction capacity (kN) of pile for an adhesion factor of 0.6 is __________ .
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Solution
Skin friction, Qf
Qf = As.α.c
= (πdL)αc
= (π × 0.5 × 10) × 0.6 × 60
= 565 kN
QUESTIONS CARRY ONE MARK EACH.
The pressure heads of two location of a pipe is shown in figure. The internal diameter of pipe is 1 m and coefficient of permeability is 1 × 105 m/s. What is the flow quantity through the soil in litre free?
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Solution