NCCCO Tower Crane Operator Exam Questions & Verified Answers with Rationale Latest Edition 2026/2027

NCCCO Tower Crane Operator Exam
Questions & Verified Answers with
Rationale Latest Edition 2026/2027


Question 1
According to ASME B30.3, how should an overhead power line
be treated prior to operating a tower crane in its vicinity?
 A. Assumed to be completely de-energized if it looks old
 B. Always considered to be energized until the power
utility or owner verifies positively that it is not energized
 C. Treated as a low-voltage line safe for accidental touch
 D. Safe to work around as long as the crane boom does not
physically touch it
CORRECT ANSWER: B
RATIONALE: Safety standards dictate that all power lines must
be treated as live and energized until explicit confirmation and
lockout/tagout verification are provided by the utility authority.
Question 2
What specific markings are required on high-tensile bolts used
for critical tower crane structural connections, such as tower
sections and the slewing ring support?
 A. Manufacturer designation and a specific strength rating
 B. Only the length and diameter dimensions
 C. A colored painted dot representing the batch

,  D. The maximum allowable crane capacity
CORRECT ANSWER: A
RATIONALE: High-tensile structural bolts must clearly display
the manufacturer's mark and strength grade designation to
ensure they match the structural engineering specifications.
Question 3
What is the minimum strength rating requirement for high-
tensile nuts used in conjunction with structural tower section
bolts?
 A. Grade 5
 B. Grade 8
 C. Rating of 12
 D. Rating of 2
CORRECT ANSWER: C
RATIONALE: High-tensile connections on tower cranes
undergo immense cyclic stress, requiring heavy-duty nuts rated
at 12 to match or exceed the bolt proof load.
Question 4
What surface marking is mandatory on washers used in high-
tensile structural bolt connections on tower cranes?
 A. CR
 B. HV
 C. NC
 D. TX

,CORRECT ANSWER: B
RATIONALE: Hardened washers marked with "HV" (High
Vickers hardness) are specifically manufactured to prevent
embedding and maintain correct clamp load under high bolt
tension.
Question 5
When ready to torque a high-tensile structural bolt connection
on a tower crane, what should be done to the threads?
 A. Keep them completely dry and dusty
 B. Coat them with heavy industrial grease or manufacturer-
approved thread lubricant
 C. Apply permanent thread-locking glue
 D. Clean them with water only
CORRECT ANSWER: B
RATIONALE: Lubricating the threads reduces friction
resistance, ensuring that the applied torque translates accurately
into the correct bolt stretch and tension limit.
Question 6
When tightening high-tensile bolt connections on a tower crane,
where should the tightening torque preferably be applied?
 A. To the bolt head
 B. To the nut
 C. Simultaneously to both ends using an impact wrench
 D. It does not matter which end is turned

, CORRECT ANSWER: B
RATIONALE: Applying torque to the nut prevents torsional
stress from twisting the bolt shank itself, achieving a truer
clamping force and tension measurement.
Question 7
When torquing down the foundation anchor bolts on a tower
crane, what position should the counter jib ideally be oriented in
relation to the bolts being checked?
 A. 0 degrees from the bolt
 B. 90 degrees away from the anchor base
 C. 180 degrees directly opposite
 D. Orientation has no effect on base torquing
CORRECT ANSWER: A
RATIONALE: Positioning the counter jib at 0 degrees aligns
balance points and weight distributions correctly relative to the
foundation anchor assembly during critical torquing phases.
Question 8
According to the NCCCO reference manual, how many full
safety turns (wraps) must be left on the hoist drum at a minimum
when the load hook is in its lowest possible position?
 A. Exactly 1 turn
 B. At least 2 turns
 C. At least 3 turns
 D. At least 5 turns