NGWA Cable Tool Drilling Exam (A/B) –
Complete Practice Test Bank {Questions}
Instructions
• Correct Answers are in Bold Italics
• Rationales are in Italic
• Based on NGWA Exam A/B: Cable Tool Drilling certification
requirements
• Covers mechanical principles, components, operational
procedures, and safety protocols
1. What is the primary purpose of a cable tool rig in drilling?
A. To drill using a rotary bit
B. To drill using percussion and lifting
C. To drill using chemical dissolution
D. To drill using hydraulic fracturing
Correct Answer: B. To drill using percussion and lifting.
Rationale: Cable tool drilling breaks formations by repeatedly lifting
and dropping a heavy tool string to mechanically crush and
pulverize the rock. This percussion action, rather than rotation or
fluid circulation, is the fundamental mechanism of the method .
,2. Which physical principle primarily provides the cutting
action in a cable-tool drill?
A. Hydraulic pressure
B. Rotational torque
C. Percussive impact of the "pounder"
D. Chemical dissolution
*Correct Answer: C. Percussive impact of the "pounder". *
Rationale: The cable-tool drill relies on a heavy "pounder" that
repeatedly strikes the drill bit, delivering percussive force that
breaks rock. Hydraulic pressure and torque are not primary
mechanisms in this system .
3. How does the elasticity of the wire line influence drilling
efficiency?
A. It dampens the impact, reducing penetration depth
B. It stores energy during the upstroke and releases it on
downstroke, enhancing impact
C. It causes the line to stretch permanently, shortening the drill
string
D. It has no effect on drilling performance
Correct Answer: B. It stores energy during the upstroke and
releases it on downstroke, enhancing impact.
,Rationale: The wire line's elasticity allows it to act like a spring,
storing energy when the line is tensioned and releasing it during
the downstroke, which augments the percussive force .
4. Which factor most directly increases the rate of penetration
(ROP) in cable-tool drilling?
A. Longer stroke length
B. Higher water flow through the bit
C. Faster wire line retrieval speed
D. Higher rotation speed
Correct Answer: A. Longer stroke length.
Rationale: A longer stroke delivers greater impact energy to the bit,
thereby increasing the energy applied to each blow and improving
penetration .
5. Which component of a cable tool rig supplies the vertical
lifting motion?
A. Rotary table
B. Walking beam
C. Kelly
D. Mud pump
Correct Answer: B. Walking beam.
, Rationale: The walking beam converts rotary motion from the
power source into an up-and-down motion that lifts and drops the
drilling tools .
6. What is the typical speed of penetration for a cable tool rig
in unconsolidated sands?
A. 10–20 ft/hr
B. 50–100 ft/hr
C. 200–300 ft/hr
D. 500–600 ft/hr
Correct Answer: A. 10–20 ft/hr.
Rationale: Cable tool drilling is relatively slow, especially in
unconsolidated formations .
7. Which tool is used to remove cuttings from the borehole in
cable tool drilling?
A. Bailer
B. Reamer
C. Stabilizer
D. Under-reamer
Correct Answer: A. Bailer.
Complete Practice Test Bank {Questions}
Instructions
• Correct Answers are in Bold Italics
• Rationales are in Italic
• Based on NGWA Exam A/B: Cable Tool Drilling certification
requirements
• Covers mechanical principles, components, operational
procedures, and safety protocols
1. What is the primary purpose of a cable tool rig in drilling?
A. To drill using a rotary bit
B. To drill using percussion and lifting
C. To drill using chemical dissolution
D. To drill using hydraulic fracturing
Correct Answer: B. To drill using percussion and lifting.
Rationale: Cable tool drilling breaks formations by repeatedly lifting
and dropping a heavy tool string to mechanically crush and
pulverize the rock. This percussion action, rather than rotation or
fluid circulation, is the fundamental mechanism of the method .
,2. Which physical principle primarily provides the cutting
action in a cable-tool drill?
A. Hydraulic pressure
B. Rotational torque
C. Percussive impact of the "pounder"
D. Chemical dissolution
*Correct Answer: C. Percussive impact of the "pounder". *
Rationale: The cable-tool drill relies on a heavy "pounder" that
repeatedly strikes the drill bit, delivering percussive force that
breaks rock. Hydraulic pressure and torque are not primary
mechanisms in this system .
3. How does the elasticity of the wire line influence drilling
efficiency?
A. It dampens the impact, reducing penetration depth
B. It stores energy during the upstroke and releases it on
downstroke, enhancing impact
C. It causes the line to stretch permanently, shortening the drill
string
D. It has no effect on drilling performance
Correct Answer: B. It stores energy during the upstroke and
releases it on downstroke, enhancing impact.
,Rationale: The wire line's elasticity allows it to act like a spring,
storing energy when the line is tensioned and releasing it during
the downstroke, which augments the percussive force .
4. Which factor most directly increases the rate of penetration
(ROP) in cable-tool drilling?
A. Longer stroke length
B. Higher water flow through the bit
C. Faster wire line retrieval speed
D. Higher rotation speed
Correct Answer: A. Longer stroke length.
Rationale: A longer stroke delivers greater impact energy to the bit,
thereby increasing the energy applied to each blow and improving
penetration .
5. Which component of a cable tool rig supplies the vertical
lifting motion?
A. Rotary table
B. Walking beam
C. Kelly
D. Mud pump
Correct Answer: B. Walking beam.
, Rationale: The walking beam converts rotary motion from the
power source into an up-and-down motion that lifts and drops the
drilling tools .
6. What is the typical speed of penetration for a cable tool rig
in unconsolidated sands?
A. 10–20 ft/hr
B. 50–100 ft/hr
C. 200–300 ft/hr
D. 500–600 ft/hr
Correct Answer: A. 10–20 ft/hr.
Rationale: Cable tool drilling is relatively slow, especially in
unconsolidated formations .
7. Which tool is used to remove cuttings from the borehole in
cable tool drilling?
A. Bailer
B. Reamer
C. Stabilizer
D. Under-reamer
Correct Answer: A. Bailer.
