Soil Mechanics and Foundation
In a triaxial compression test when drainage is allowed during the first stage (i. e. application of cell pressure) only and not during the second stage (i.e. application of deviator stress at constant cell pressure), the test is known as

unconsolidated undrained test
consolidated undrained test
consolidated drained test
unconsolidated drained test

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Soil Mechanics and Foundation
A tri-axial shear test is preferred to direct shear test, because

It can be performed under all three drainage conditions with complete control
Stress distribution on the failure plane, is non uniform
None of these
Precise measurement of pore pressure and change in volume during test, is not possible

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Soil Mechanics and Foundation
With the increase in the amount of compaction energy

both optimum water content and maximum dry density decrease[ES 93]
optimum water content decreases but maximum dry density increases
optimum water content increases but maximum dry density decreases
both optimum water content and maximum dry density increase

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