Subtopic: I.C. engine systems – fuel, cooling, lubrication, ignition, electrical, intake and exhaust
Question Statement:
Mole drain is the most suitable drainage system for
Options:
(A) heavy clay soil
(B) loamy soil
(C) sandy soil
(D) silty soil
Official Answer Key:
A
Step-by-Step Solution & Explanation
Mole drains are unlined tunnel-shaped channels formed by pulling a mole plough through the soil; they rely on the soil having sufficient cohesion and stability to hold the tunnel shape open without lining. Heavy clay soils possess this cohesive strength (and the low permeability that most needs subsurface drainage), making them ideally suited to mole draining. Loamy, sandy and silty soils (B, C, D) lack the cohesion to sustain a stable unlined mole channel and are prone to collapse. Hence (A) is correct.
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