AZ ROC A-4 Drilling Practice Questions - Arizona ROC A-4 Drilling Examination Exam

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An air rotary rig is operating a 6-inch down-the-hole (DTH) hammer in hard granite bedrock. What component supplies pneumatic energy to actuate the internal hammer piston?

A high-pressure hydraulic pump on the rig deck High-pressure bentonite slurry pumped down the casing Compressed air delivered through the hollow drill string Mechanical rotation of the Kelly bar

Correct Answer:

Compressed air delivered through the hollow drill string

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