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 drained test
consolidated undrained test
consolidated drained test
unconsolidated undrained test

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

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

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