NCCCO Digger Derrick Operator
Certification Exam Preparation
(UPDATED 2026) – Practice Questions
with Verified Answers and Rationales
Complete Study Guide Instant Download
Pdf
What does the white flag represent? -CORRECTANSWER Proposed excavation
What does the pink flag represent? -CORRECTANSWER Temporary Survey Markings
What does the red flag represent? -CORRECTANSWER Electric power lines, cables,
and conduits
What does the yellow flag represent? -CORRECTANSWER Gas, oil, steam, petroleum,
and gaseous materials
What does the orange flag represent? -CORRECTANSWER Communications, alarms,
or signal lines
What does the blue flag represent? -CORRECTANSWER Potable water
, What does the purple flag represent? -CORRECTANSWER Reclaimed water, irrigation,
slurry lines
What does the green flag represent? -CORRECTANSWER Sewers and drain lines
What does the OSHA standard say in 1926.959a2? -CORRECTANSWER The critical
safety components of mechanical elevating and rotating equipment shall receive a
thorough visual inspection before use on each shift
At minimum, what should be done for a critical component check? -
CORRECTANSWER Raise the boom and rotate both ways to verify proper operation
then extend/retract
What is the number for call before you dig and what information do you need to know? -
CORRECTANSWER 811 contact information, location of the dig, and type of work
What is a tolerance zone used for? -CORRECTANSWER To use prudent excavation
techniques
What are prudent excavation techniques? -CORRECTANSWER Digging by hand or
vacuum excavation
What does TTC stand for? -CORRECTANSWER Temporary Traffic Control
Certification Exam Preparation
(UPDATED 2026) – Practice Questions
with Verified Answers and Rationales
Complete Study Guide Instant Download
What does the white flag represent? -CORRECTANSWER Proposed excavation
What does the pink flag represent? -CORRECTANSWER Temporary Survey Markings
What does the red flag represent? -CORRECTANSWER Electric power lines, cables,
and conduits
What does the yellow flag represent? -CORRECTANSWER Gas, oil, steam, petroleum,
and gaseous materials
What does the orange flag represent? -CORRECTANSWER Communications, alarms,
or signal lines
What does the blue flag represent? -CORRECTANSWER Potable water
, What does the purple flag represent? -CORRECTANSWER Reclaimed water, irrigation,
slurry lines
What does the green flag represent? -CORRECTANSWER Sewers and drain lines
What does the OSHA standard say in 1926.959a2? -CORRECTANSWER The critical
safety components of mechanical elevating and rotating equipment shall receive a
thorough visual inspection before use on each shift
At minimum, what should be done for a critical component check? -
CORRECTANSWER Raise the boom and rotate both ways to verify proper operation
then extend/retract
What is the number for call before you dig and what information do you need to know? -
CORRECTANSWER 811 contact information, location of the dig, and type of work
What is a tolerance zone used for? -CORRECTANSWER To use prudent excavation
techniques
What are prudent excavation techniques? -CORRECTANSWER Digging by hand or
vacuum excavation
What does TTC stand for? -CORRECTANSWER Temporary Traffic Control
