Highway Engineering
The most suitable equipment for compacting clayey soils is a

pneumatic tyred roller
vibrator
smooth wheeled roller
sheep foot roller

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Highway Engineering
If b is the wheel track of a vehicle and h is the height of centre of gravity above road surface, then to avoid overturning and lateral skidding on a horizontal curve, the centrifugal ratio should always be

less than b/2h and greater than co-efficient of lateral friction
greater than b/2h and also greater than coefficient of lateral friction
less than b/2h and also less than co-efficient of lateral friction
greater than b/2h and less than co-efficient of lateral friction

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Highway Engineering
In soils having same values of plasticity index, if liquid limit is increased, then

Compressibility, permeability and dry strength decrease
Compressibility, permeability and dry strength increase
Compressibility and permeability increase and dry strength decreases
Compressibility and permeability decrease and dry strength increases

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