NCCCO Telescopic Boom Crane Exam
Questions & Verified Answers with
Rationale Latest Edition 2026/2027
Question 1
According to ASME B30.5, what is the minimum required
clearance between any part of a telescopic boom crane or its
load and a high-voltage power line carrying up to 50 kV?
A. 5 feet (1.5 meters)
B. 10 feet (3.0 meters)
C. 20 feet (6.0 meters)
D. 50 feet (15.0 meters)
CORRECT ANSWER: B
RATIONALE: For lines rated 50 kV or below, federal OSHA
and ASME B30.5 standards mandate a minimum safe operating
clearance of 10 feet unless the lines have been positively
verified as de-energized and grounded.
Question 2
What is the primary function of a telescopic crane's load
moment indicator (LMI)?
A. To record daily fuel consumption and engine hours
B. To continuously monitor boom length, boom angle,
operating radius, and weight on the hook, warning the
operator or locking out functions before an overload occurs
, C. To measure the temperature of the hydraulic fluid
reservoir
D. To control the automatic transmission shifting on the
carrier frame
CORRECT ANSWER: B
RATIONALE: The LMI is a critical electronic safety device that
calculates real-time lifting capacity versus actual load,
preventing structural overloads and crane tip-overs.
Question 3
What is the correct action if an operator experiences hydraulic
system chatter or spongy control responses when operating
boom extension cylinders?
A. Increase the engine throttle to maximum speed
immediately
B. Check hydraulic fluid levels, inspect for air aeration in
the system, and check pump performance
C. Continue lifting heavy loads until the air works its way
out naturally
D. Drain all hydraulic oil onto the ground
CORRECT ANSWER: B
RATIONALE: Spongy controls or chatter typically indicate air
aeration, low fluid levels, or pump cavitation, which can damage
internal components and cause erratic load control.
Question 4
,According to ASME B30.5, 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
CORRECT ANSWER: C
RATIONALE: A minimum of 3 full wraps must remain on the
drum to ensure friction holds the rope and prevents anchor
failure or slip under maximum load.
Question 5
What is the primary purpose of an anti-two-block (A2B)
warning and lockout system on a telescopic boom crane?
A. To automatically stop hoist-up, boom-extend, and
boom-down functions before the hook block collides with
the boom nose sheaves
B. To shut down the main diesel engine completely
C. To lock the outrigger vertical jacks in place
D. To prevent the operator from swinging the crane too fast
CORRECT ANSWER: A
RATIONALE: The A2B system takes control away from the
operator when two-blocking is imminent, automatically halting
the specific motions that cause the collision and prevent hoist
line parting.
, Question 6
When inspecting synthetic web slings used with a telescopic
crane, what defect requires immediate removal from service?
A. Slight fading of the sewn-on identification tag
B. Acid or caustic burns, melting, charring, snags,
punctures, or broken stitching
C. Accumulation of clean dust from the job site
D. Standard manufacturer warning labels
CORRECT ANSWER: B
RATIONALE: Chemical exposure, heat damage, cuts, and torn
stitching severely compromise the tensile strength of synthetic
slings, making them unsafe for lifting.
Question 7
What is the primary hazard of side-loading the boom of a
telescopic hydraulic crane?
A. Lateral twisting forces can cause structural buckling,
wear out wear pads prematurely, and damage boom section
alignment or stability
B. Faster tire wear on the carrier chassis
C. Rapid draining of the hydraulic oil cooler
D. Slipping of the swing brake friction discs
CORRECT ANSWER: B
RATIONALE: Telescopic booms are engineered for vertical
load resistance and possess very low structural tolerance for
lateral twisting or side-loading forces.
Questions & Verified Answers with
Rationale Latest Edition 2026/2027
Question 1
According to ASME B30.5, what is the minimum required
clearance between any part of a telescopic boom crane or its
load and a high-voltage power line carrying up to 50 kV?
A. 5 feet (1.5 meters)
B. 10 feet (3.0 meters)
C. 20 feet (6.0 meters)
D. 50 feet (15.0 meters)
CORRECT ANSWER: B
RATIONALE: For lines rated 50 kV or below, federal OSHA
and ASME B30.5 standards mandate a minimum safe operating
clearance of 10 feet unless the lines have been positively
verified as de-energized and grounded.
Question 2
What is the primary function of a telescopic crane's load
moment indicator (LMI)?
A. To record daily fuel consumption and engine hours
B. To continuously monitor boom length, boom angle,
operating radius, and weight on the hook, warning the
operator or locking out functions before an overload occurs
, C. To measure the temperature of the hydraulic fluid
reservoir
D. To control the automatic transmission shifting on the
carrier frame
CORRECT ANSWER: B
RATIONALE: The LMI is a critical electronic safety device that
calculates real-time lifting capacity versus actual load,
preventing structural overloads and crane tip-overs.
Question 3
What is the correct action if an operator experiences hydraulic
system chatter or spongy control responses when operating
boom extension cylinders?
A. Increase the engine throttle to maximum speed
immediately
B. Check hydraulic fluid levels, inspect for air aeration in
the system, and check pump performance
C. Continue lifting heavy loads until the air works its way
out naturally
D. Drain all hydraulic oil onto the ground
CORRECT ANSWER: B
RATIONALE: Spongy controls or chatter typically indicate air
aeration, low fluid levels, or pump cavitation, which can damage
internal components and cause erratic load control.
Question 4
,According to ASME B30.5, 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
CORRECT ANSWER: C
RATIONALE: A minimum of 3 full wraps must remain on the
drum to ensure friction holds the rope and prevents anchor
failure or slip under maximum load.
Question 5
What is the primary purpose of an anti-two-block (A2B)
warning and lockout system on a telescopic boom crane?
A. To automatically stop hoist-up, boom-extend, and
boom-down functions before the hook block collides with
the boom nose sheaves
B. To shut down the main diesel engine completely
C. To lock the outrigger vertical jacks in place
D. To prevent the operator from swinging the crane too fast
CORRECT ANSWER: A
RATIONALE: The A2B system takes control away from the
operator when two-blocking is imminent, automatically halting
the specific motions that cause the collision and prevent hoist
line parting.
, Question 6
When inspecting synthetic web slings used with a telescopic
crane, what defect requires immediate removal from service?
A. Slight fading of the sewn-on identification tag
B. Acid or caustic burns, melting, charring, snags,
punctures, or broken stitching
C. Accumulation of clean dust from the job site
D. Standard manufacturer warning labels
CORRECT ANSWER: B
RATIONALE: Chemical exposure, heat damage, cuts, and torn
stitching severely compromise the tensile strength of synthetic
slings, making them unsafe for lifting.
Question 7
What is the primary hazard of side-loading the boom of a
telescopic hydraulic crane?
A. Lateral twisting forces can cause structural buckling,
wear out wear pads prematurely, and damage boom section
alignment or stability
B. Faster tire wear on the carrier chassis
C. Rapid draining of the hydraulic oil cooler
D. Slipping of the swing brake friction discs
CORRECT ANSWER: B
RATIONALE: Telescopic booms are engineered for vertical
load resistance and possess very low structural tolerance for
lateral twisting or side-loading forces.
