What compacting equipment generates compactive forces such as pressure, impact, and vibration and are most effective on granular materials?
a. Smooth-drum vibratory soil compactors
b. Pad-drum vibratory soil compactors
c. Vibrating compactors
d. Tamping rollers
e. Pneumatic-tired rollers
Answer: a. Smooth-drum vibratory soil compactors
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