The BOD removal efficiency, in percentage, during primary treatmet under normal

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Question
The BOD removal efficiency, in percentage, during primary treatmet under normal conditions is about
Options
A. 65%
B. 85%
C. 30%
D. Zero

Correct Answer

65%

GATE Exam Questions problems

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1. The problem of lateral buckling can arise only in those steel beams which have
Options
A. Moment of inertia about the bending axis larger than the other
B. Moment of inertia about the bending axis smaller than the other
C. Fully supported compression flange
D. None of the above.

2. A three hinged arch shown in the below figur is quarter of a circle, If the vertical and horizontal components of reaction at A are equal, the value of ? is
Options
A. 60�
B. 45�
C. 30�
D. None in (0�, 90�)

3. The equation along a stream line holds true for :
Options
A. steady, frictionless, compressible fluid
B. steady, uniform, incompressible fluid
C. steady, frictionless, incompressible fluid
D. unsteady incompressible fluid

4. The net effective cross sectional area calculated in the steel angle tension member design, accounts for:
Options
A. the tensile force and bolt holes
B. the eccentricity of the end connections and the bolt holes
C. the effectiveness of the tack connection along the length
D. the effectiveness of the end connection

6. If a single pipe of length L and diameter D is to be replaced by three pipes of same material, same length and equal diameter d (d < D), to convey the same total discharge under the same head loss, then d and D are related by
Options
A.
B.
C.
D.

7. The Piezometric head at point C, in the experimental set-up shown in the below figure when the flow takes place under a constant head through the soils A and B is
Options
A. 0 cm
B. 40 cm
C. 80 cm
D. 120 cm

8. In an area of 200 hectare, water table drops by 4 m. If the porosity is 0.35 and the specific retention is 0.15, change in volume of storage in the aquifer is
Options
A. 160 m³
B. 1.6 x 10⁶ m
C. 8 x 10⁶ m³
D. 1.6 x 10³ m³

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