Civil Engineering MCQAE Level Civil Engineering
The equivalent permeability for flow perpendicular to three soil layers (depths Z1, Z2, Z3; permeabilities K1, K2, K3) is
Soil MechanicsSoil MechanicsMEDIUM
Choose the correct answer
A
(Z1+Z2+Z3)/(Z1/K1+Z2/K2+Z3/K3)
B
(K1Z1+K2Z2+K3Z3)/(Z1+Z2+Z3)
C
(Z1K1+Z2K2+Z3K3)/(Z1+Z2+Z3)
D
(Z1+Z2+Z3)(K1Z1+K2Z2+K3Z3)
Correct Answer
A. (Z1+Z2+Z3)/(Z1/K1+Z2/K2+Z3/K3)
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Flow perpendicular to layers → harmonic mean: Keq = ΣZ / Σ(Z/K).
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This MCQ belongs to WBPSC AE Previous Years Questions Series. Full tests include timed attempts, rank comparison and subject-wise analysis.