NGWA Air Rotary Drilling Certification
Exam (Exam C) Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of air rotary drilling?
A. To drill through soft clay only
B. To circulate drilling mud
C. To remove cuttings using compressed air
D. To install casing without rotation
Air rotary drilling relies on compressed air to lif t cuttings out of the
borehole.
2. Which formation is best suited for air rotary drilling?
A. Saturated sand
B. Soft peat
C. Hard consolidated rock
D. Expansive clay
Air rotary methods perform best in hard, dry, consolidated
formations.
3. What is the function of the drill bit in air rotary drilling?
A. Seal the borehole
, B. Compress air
C. Cut and fracture formation material
D. Measure depth
The drill bit breaks rock so cuttings can be lifted by air.
4. Which compressor capacity is most critical in air rotary drilling?
A. Voltage
B. PSI only
C. CFM (cubic feet per minute)
D. Temperature rating
High airflow volume is essential to lift cuttings effectively.
5. What happens if insufficient air volume is used?
A. Faster drilling
B. Cleaner borehole
C. Poor cuttings removal
D. Increased penetration rate
Low air volume allows cuttings to fall back into the hole.
6. What is a common hazard when drilling with air in fractured
formations?
A. Mud loss
B. Bit overheating
C. Blowing water or debris from the borehole
D. Bent drill rods
Compressed air can force water and debris violently upward.
7. Which component directs compressed air down the drill string?
A. Swivel
B. Air injection system
C. Derrick
, D. Hoist line
The air system channels compressed air to the bit.
8. What is the main purpose of foam in air rotary drilling?
A. Lubricate the engine
B. Increase torque
C. Improve cuttings removal and control dust
D. Harden the borehole
Foam stabilizes cuttings and reduces dust and water inflow.
9. Excessive dust during drilling indicates:
A. Too much water
B. Insufficient foam or mist
C. Low rotation speed
D. Excess casing
Dust control requires proper mist or foam injection.
10. Which safety risk is highest at the discharge line?
A. Electrical shock
B. High-velocity air and debris
C. Noise only
D. Slippery surfaces
Debris expelled at high speed poses serious injury risk.
11. What PPE is especially critical during air rotary drilling?
A. Cotton gloves
B. Face mask only
C. Eye and face protection
D. Rubber boots only
Flying cuttings make eye and face protection essential.
Exam (Exam C) Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of air rotary drilling?
A. To drill through soft clay only
B. To circulate drilling mud
C. To remove cuttings using compressed air
D. To install casing without rotation
Air rotary drilling relies on compressed air to lif t cuttings out of the
borehole.
2. Which formation is best suited for air rotary drilling?
A. Saturated sand
B. Soft peat
C. Hard consolidated rock
D. Expansive clay
Air rotary methods perform best in hard, dry, consolidated
formations.
3. What is the function of the drill bit in air rotary drilling?
A. Seal the borehole
, B. Compress air
C. Cut and fracture formation material
D. Measure depth
The drill bit breaks rock so cuttings can be lifted by air.
4. Which compressor capacity is most critical in air rotary drilling?
A. Voltage
B. PSI only
C. CFM (cubic feet per minute)
D. Temperature rating
High airflow volume is essential to lift cuttings effectively.
5. What happens if insufficient air volume is used?
A. Faster drilling
B. Cleaner borehole
C. Poor cuttings removal
D. Increased penetration rate
Low air volume allows cuttings to fall back into the hole.
6. What is a common hazard when drilling with air in fractured
formations?
A. Mud loss
B. Bit overheating
C. Blowing water or debris from the borehole
D. Bent drill rods
Compressed air can force water and debris violently upward.
7. Which component directs compressed air down the drill string?
A. Swivel
B. Air injection system
C. Derrick
, D. Hoist line
The air system channels compressed air to the bit.
8. What is the main purpose of foam in air rotary drilling?
A. Lubricate the engine
B. Increase torque
C. Improve cuttings removal and control dust
D. Harden the borehole
Foam stabilizes cuttings and reduces dust and water inflow.
9. Excessive dust during drilling indicates:
A. Too much water
B. Insufficient foam or mist
C. Low rotation speed
D. Excess casing
Dust control requires proper mist or foam injection.
10. Which safety risk is highest at the discharge line?
A. Electrical shock
B. High-velocity air and debris
C. Noise only
D. Slippery surfaces
Debris expelled at high speed poses serious injury risk.
11. What PPE is especially critical during air rotary drilling?
A. Cotton gloves
B. Face mask only
C. Eye and face protection
D. Rubber boots only
Flying cuttings make eye and face protection essential.
