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MOBILE CRANE EXAM PREP TLL/TSS 2026/2027 | TLL & TSS
Certification | 100% Correct Verified Answers | Pass
Guaranteed - A+ Graded
Section 1: Mobile Crane Configurations & Components (Q1-12)
Q1. A crane operator is preparing to operate a rough terrain crane where the
operator's cab rotates with the upperstructure. This crane type is classified as:
A. TSS carrier-mounted fixed cab
B. TLL swing cab [CORRECT]
C. LBC lattice boom crawler
D. TSS telescopic boom truck
Correct Answer: B
Rationale: Per NCCCO classification, TLL refers to telescopic boom cranes with a
swing cab where the cab rotates with the upperstructure, typical of rough terrain
cranes. TSS refers to carrier-mounted cranes with fixed cabs.
Q2. During setup of a telescopic boom crane, the operator extends the boom using
hydraulic telescoping sections. Which statement about hydraulic boom extension is
correct?
A. All boom sections must be extended equally to maintain structural integrity.
B. Hydraulic telescoping allows variable boom lengths without pinning intermediate
sections [CORRECT]
C. Hydraulic extension is only permitted when the crane is on outriggers.
D. The boom must be fully retracted before any load is lifted.
Correct Answer: B
Rationale: Hydraulic telescopic booms extend and retract continuously without
requiring manual pinning of intermediate sections, unlike pinned booms. Sections do
not need equal extension (A), hydraulic extension is not restricted to outriggers (C),
and loads can be lifted at partial extension (D).
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Q3. A TSS crane is fitted with a lattice boom extension (jib) attached to the main
telescopic boom tip. Which factor most significantly reduces the main boom's rated
capacity when a lattice jib is installed?
A. The additional weight of the jib and its suspension system [CORRECT]
B. The increased wind resistance of the lattice structure
C. The change in boom material from steel to aluminum
D. The additional counterweight required at the rear
Correct Answer: A
Rationale: Lattice jib attachments add weight to the boom tip, increasing boom
dead load and reducing net lifting capacity. This weight must be deducted from the
gross capacity. Wind resistance (B) affects dynamics but not static chart capacity.
Material (C) is irrelevant. Counterweight (D) is for stability, not a reduction factor.
Q4. An operator needs to configure a TLL crane for a heavy lift requiring maximum
capacity over the rear. Which configuration provides the greatest stability and
capacity?
A. Main boom only at minimum radius with standard counterweight
B. Main boom with fully extended fly jib offset at 20°
C. Main boom at minimum radius with maximum counterweight installed [CORRECT]
D. Main boom retracted with no hook block attached
Correct Answer: C
Rationale: Maximum counterweight increases the crane's resisting moment, and
minimum radius minimizes the load moment, providing the greatest net capacity
over the rear. Fly jibs (B) reduce capacity. No hook block (D) is unsafe and irrelevant
to structural capacity.
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Q5. Which component on a mobile crane directly measures the load moment (load ×
radius) and triggers an alarm when the rated capacity is approached?
A. Load line tension meter
B. Load Moment Indicator (LMI) or Rated Capacity Limiter (RCL) [CORRECT]
C. Boom angle indicator
D. Outrigger load cell
Correct Answer: B
Rationale: The LMI/RCL continuously calculates load moment by sensing boom
angle, length, and load, comparing it to the rated capacity curve. A load line meter
(A) measures line pull only. Boom angle indicator (C) shows angle but does not
calculate moment. Outrigger cells (D) measure ground bearing force.
Q6. A job site requires lifting a 12,000 lb load to a height of 85 ft with a radius of 45
ft. The crane selection committee must choose between a TLL and TSS crane. Which
factor most influences the decision if the site has soft ground and limited access?
A. The TSS crane's ability to lift on rubber eliminates the need for outrigger mats.
B. The TLL crane's swing cab provides better visibility but lower capacity than a TSS.
C. The TLL crane's outrigger setup provides better load distribution on soft ground
than TSS on rubber [CORRECT]
D. The TSS crane's fixed cab allows for higher travel speeds with the load.
Correct Answer: C
Rationale: On soft ground, outriggers with proper mats distribute load over a larger
area than tires (rubber), preventing sinking and instability. Lifting on rubber (A) is
unsafe on soft ground. Visibility (B) and travel speed (D) are not primary selection
factors for ground bearing.
Q7. On a telescopic boom crane with pinned boom sections, what must the operator
verify before lifting?
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A. That all hydraulic cylinders are fully retracted
B. That all pinning mechanisms are fully engaged and locked [CORRECT]
C. That the boom angle is exactly 45 degrees
D. That the anti-two-block is disabled for maximum hook height
Correct Answer: B
Rationale: Pinned boom sections require manual insertion of pins at specific
intervals; failure to lock pins risks boom collapse. Hydraulic cylinders (A) may be
partially extended. Exact angle (C) is not required. Anti-two-block (D) must never be
disabled.
Q8. Which statement correctly describes the difference between a stowed jib and a
pinned offset jib during lifting operations?
A. A stowed jib is attached but not used, while a pinned offset jib is active and
changes boom geometry [CORRECT]
B. A stowed jib is removed from the crane, while a pinned offset jib remains attached
at all times.
C. A stowed jib adds no weight to the boom, while a pinned offset jib reduces
capacity by 50%.
D. A stowed jib is used for lifting, while a pinned offset jib is used only for boom
storage.
Correct Answer: A
Rationale: A stowed jib is carried on the boom but not deployed for lifting; its
weight may still require deduction. A pinned offset jib is deployed at an angle and
actively used, affecting boom geometry and capacity. Stowed jibs are not removed
(B), they do add weight (C), and offset jibs are for lifting (D).
Q9. The main boom of a mobile crane is equipped with an auxiliary lifting sheave
(headache ball) at the boom tip. What is the primary purpose of this device?
MOBILE CRANE EXAM PREP TLL/TSS 2026/2027 | TLL & TSS
Certification | 100% Correct Verified Answers | Pass
Guaranteed - A+ Graded
Section 1: Mobile Crane Configurations & Components (Q1-12)
Q1. A crane operator is preparing to operate a rough terrain crane where the
operator's cab rotates with the upperstructure. This crane type is classified as:
A. TSS carrier-mounted fixed cab
B. TLL swing cab [CORRECT]
C. LBC lattice boom crawler
D. TSS telescopic boom truck
Correct Answer: B
Rationale: Per NCCCO classification, TLL refers to telescopic boom cranes with a
swing cab where the cab rotates with the upperstructure, typical of rough terrain
cranes. TSS refers to carrier-mounted cranes with fixed cabs.
Q2. During setup of a telescopic boom crane, the operator extends the boom using
hydraulic telescoping sections. Which statement about hydraulic boom extension is
correct?
A. All boom sections must be extended equally to maintain structural integrity.
B. Hydraulic telescoping allows variable boom lengths without pinning intermediate
sections [CORRECT]
C. Hydraulic extension is only permitted when the crane is on outriggers.
D. The boom must be fully retracted before any load is lifted.
Correct Answer: B
Rationale: Hydraulic telescopic booms extend and retract continuously without
requiring manual pinning of intermediate sections, unlike pinned booms. Sections do
not need equal extension (A), hydraulic extension is not restricted to outriggers (C),
and loads can be lifted at partial extension (D).
,2
Q3. A TSS crane is fitted with a lattice boom extension (jib) attached to the main
telescopic boom tip. Which factor most significantly reduces the main boom's rated
capacity when a lattice jib is installed?
A. The additional weight of the jib and its suspension system [CORRECT]
B. The increased wind resistance of the lattice structure
C. The change in boom material from steel to aluminum
D. The additional counterweight required at the rear
Correct Answer: A
Rationale: Lattice jib attachments add weight to the boom tip, increasing boom
dead load and reducing net lifting capacity. This weight must be deducted from the
gross capacity. Wind resistance (B) affects dynamics but not static chart capacity.
Material (C) is irrelevant. Counterweight (D) is for stability, not a reduction factor.
Q4. An operator needs to configure a TLL crane for a heavy lift requiring maximum
capacity over the rear. Which configuration provides the greatest stability and
capacity?
A. Main boom only at minimum radius with standard counterweight
B. Main boom with fully extended fly jib offset at 20°
C. Main boom at minimum radius with maximum counterweight installed [CORRECT]
D. Main boom retracted with no hook block attached
Correct Answer: C
Rationale: Maximum counterweight increases the crane's resisting moment, and
minimum radius minimizes the load moment, providing the greatest net capacity
over the rear. Fly jibs (B) reduce capacity. No hook block (D) is unsafe and irrelevant
to structural capacity.
,3
Q5. Which component on a mobile crane directly measures the load moment (load ×
radius) and triggers an alarm when the rated capacity is approached?
A. Load line tension meter
B. Load Moment Indicator (LMI) or Rated Capacity Limiter (RCL) [CORRECT]
C. Boom angle indicator
D. Outrigger load cell
Correct Answer: B
Rationale: The LMI/RCL continuously calculates load moment by sensing boom
angle, length, and load, comparing it to the rated capacity curve. A load line meter
(A) measures line pull only. Boom angle indicator (C) shows angle but does not
calculate moment. Outrigger cells (D) measure ground bearing force.
Q6. A job site requires lifting a 12,000 lb load to a height of 85 ft with a radius of 45
ft. The crane selection committee must choose between a TLL and TSS crane. Which
factor most influences the decision if the site has soft ground and limited access?
A. The TSS crane's ability to lift on rubber eliminates the need for outrigger mats.
B. The TLL crane's swing cab provides better visibility but lower capacity than a TSS.
C. The TLL crane's outrigger setup provides better load distribution on soft ground
than TSS on rubber [CORRECT]
D. The TSS crane's fixed cab allows for higher travel speeds with the load.
Correct Answer: C
Rationale: On soft ground, outriggers with proper mats distribute load over a larger
area than tires (rubber), preventing sinking and instability. Lifting on rubber (A) is
unsafe on soft ground. Visibility (B) and travel speed (D) are not primary selection
factors for ground bearing.
Q7. On a telescopic boom crane with pinned boom sections, what must the operator
verify before lifting?
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A. That all hydraulic cylinders are fully retracted
B. That all pinning mechanisms are fully engaged and locked [CORRECT]
C. That the boom angle is exactly 45 degrees
D. That the anti-two-block is disabled for maximum hook height
Correct Answer: B
Rationale: Pinned boom sections require manual insertion of pins at specific
intervals; failure to lock pins risks boom collapse. Hydraulic cylinders (A) may be
partially extended. Exact angle (C) is not required. Anti-two-block (D) must never be
disabled.
Q8. Which statement correctly describes the difference between a stowed jib and a
pinned offset jib during lifting operations?
A. A stowed jib is attached but not used, while a pinned offset jib is active and
changes boom geometry [CORRECT]
B. A stowed jib is removed from the crane, while a pinned offset jib remains attached
at all times.
C. A stowed jib adds no weight to the boom, while a pinned offset jib reduces
capacity by 50%.
D. A stowed jib is used for lifting, while a pinned offset jib is used only for boom
storage.
Correct Answer: A
Rationale: A stowed jib is carried on the boom but not deployed for lifting; its
weight may still require deduction. A pinned offset jib is deployed at an angle and
actively used, affecting boom geometry and capacity. Stowed jibs are not removed
(B), they do add weight (C), and offset jibs are for lifting (D).
Q9. The main boom of a mobile crane is equipped with an auxiliary lifting sheave
(headache ball) at the boom tip. What is the primary purpose of this device?
