Examination
180 minutes
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NCCCO - National Commission for the Certification of
Crane Operators 2024- 2025
NCCCO Drill Rig Operator Essential Interview Questions
and Answers | 100% Pass Guaranteed | Graded A+ |
Read All Instructions Carefully and Answer All the
Questions Correctly Good Luck: -
Essential Interview Questions For Drilling Rig
Operator
1. Explain the principle of operation of a typical
drilling rig?
A typical drilling rig operates on the principle of rotary
drilling, where a drill bit is rotated at high speeds to
penetrate the earth’s surface and create a borehole.
The drill bit is attached to a drill string, which is a long,
hollow pipe that transmits power and drilling fluid to
the bit.
The drill string is rotated by a top drive or rotary
table, which provides torque and speed to the bit.
Drilling fluid is pumped down the drill string and
through the drill bit, which helps to lubricate the
bit, cool it, and remove cuttings from the borehole.
As the drill bit penetrates the earth, cuttings are
generated and carried up the borehole by the
drilling fluid. These cuttings are then separated
from the fluid using a solids control system.
The drilling process continues until the desired
depth is reached or the geological formation
changes, requiring a different drilling technique.
2. Describe the different types of drilling rigs and
their applications.
Onshore Drilling Rigs
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