NCCCO Telescopic Boom Crane – Fixed Cab (TSS) | NCCCO TSS Exam Study
Guide & Exam Prep 2026–2027 | NCCCO TSS Certification Test Review |
Telescopic Boom Cranes Fixed Cab, TSS Written Exam, TSS Practical Exam,
NCCCO Core Exam, Crane Operations, Crane Safety, Load Charts, Rated
Capacity, Load Radius, Boom Length, Boom Angle, Wire Rope, Reeving, Parts
of Line, Crane Setup, Outriggers, Ground Conditions, Work Area Control,
Power Lines, Electrical Hazards, Signalperson Communication, Rigging,
Lifting Operations, Dynamic Loading, Stability, Crane Inspection, OSHA Crane
Safety & Operator Responsibilities | Practice Questions, Load Chart
Problems, Scenario-Based Review & Detailed Rationales
Question 1: What is the primary purpose of the load moment indicator (LMI) on
a telescopic boom crane?
A. To display the boom angle and length
B. To warn the operator when the load approaches the crane's rated capacity
C. To control the swing speed automatically
D. To measure wind speed at the boom tip
CORRECT ANSWER: B. To warn the operator when the load approaches the
crane's rated capacity
Rationale: The load moment indicator (LMI) continuously monitors the load
moment and warns the operator when the crane is approaching its rated
capacity, helping prevent overloading and tipping. It is a critical operational aid
that calculates the relationship between boom length, radius, and load weight.
Question 2: Under OSHA 1926 Subpart CC, what is the minimum clearance
distance for crane operation near power lines rated up to 50 kV?
A. 5 feet
B. 10 feet
C. 15 feet
D. 20 feet
CORRECT ANSWER: B. 10 feet
Rationale: OSHA Table A in 1926.1408 specifies that the minimum approach
distance for power lines up to 50 kV is 10 feet. This clearance must be maintained
between any part of the crane, load line, or load and the energized line.
,Question 3: When a telescopic boom crane is set up on outriggers, what is the
primary purpose of blocking or cribbing beneath the outrigger floats?
A. To increase the crane's lifting capacity beyond the load chart
B. To distribute the outrigger load over a larger ground area
C. To raise the crane to a higher operating position
D. To reduce hydraulic pressure in the outrigger cylinders
CORRECT ANSWER: B. To distribute the outrigger load over a larger ground area
Rationale: Blocking or cribbing spreads the concentrated outrigger reaction forces
over a larger surface area, reducing ground-bearing pressure and preventing
settlement or penetration that could compromise crane stability.
Question 4: Which condition would require the operator to immediately stop
operations and address the situation?
A. The load is swinging slightly due to wind
B. An outrigger begins to settle into the ground during a lift
C. The boom angle indicator reads slightly differently than expected
D. The signal person is using standard hand signals
CORRECT ANSWER: B. An outrigger begins to settle into the ground during a lift
Rationale: Outrigger settlement indicates a loss of ground support, which directly
affects crane stability and can lead to tipping or structural failure. The operator
must stop the lift immediately and address the ground-support problem before
continuing.
Question 5: What does the term "net capacity" represent on a crane load chart?
A. The maximum capacity of the crane with no deductions
B. The gross capacity minus all applicable deductions
C. The weight of the load only
D. The capacity listed for the shortest boom length
CORRECT ANSWER: B. The gross capacity minus all applicable deductions
Rationale: Net capacity is the actual available lifting capacity after deducting the
weight of all load-handling equipment such as hook blocks, headache balls,
rigging, and lifting beams from the gross rated capacity.
,Question 6: If a load weighs 15,000 lb, the hook block weighs 1,000 lb, and the
rigging weighs 500 lb, what is the minimum gross rated capacity required from
the load chart?
A. 15,000 lb
B. 15,500 lb
C. 16,000 lb
D. 16,500 lb
CORRECT ANSWER: D. 16,500 lb
Rationale: The gross rated capacity must be equal to or greater than the total load
comprising the load weight plus all deductions. Total = 15,000 + 1,000 + 500 =
16,500 lb.
Question 7: Which device is designed to prevent the load block from contacting
the boom tip?
A. Boom angle indicator
B. Anti-two-block device
C. Load moment indicator
D. Drum rotation indicator
CORRECT ANSWER: B. Anti-two-block device
Rationale: The anti-two-block device detects when the load block or headache
ball approaches the boom tip and either warns the operator or stops the
hazardous functions (hoist up, boom down, telescope out) to prevent contact and
potential wire rope failure.
Question 8: According to OSHA, what is the minimum number of wraps of wire
rope that must remain on the hoist drum at all times?
A. One wrap
B. Two wraps
C. Three wraps
D. Four wraps
CORRECT ANSWER: B. Two wraps
, Rationale: OSHA 1926.1416 requires that a minimum of two full wraps of wire
rope remain on the hoist drum at all times to ensure sufficient friction and
prevent the rope from slipping off the drum.
Question 9: When operating a telescopic boom crane, which factor most directly
determines the crane's rated capacity?
A. The color of the load
B. Boom length and load radius
C. The operator's experience level
D. The time of day
CORRECT ANSWER: B. Boom length and load radius
Rationale: Rated capacity is determined by the specific boom length and load
radius configuration as indicated in the manufacturer's load chart. As radius
increases or boom length changes, capacity generally decreases.
Question 10: What is the most stable quadrant of operation for a typical boom
truck?
A. Over the front
B. Over the rear
C. Over the side
D. All quadrants are equally stable
CORRECT ANSWER: B. Over the rear
Rationale: The rear quadrant of a boom truck provides the greatest stability
because the crane's counterweight and structural design offer maximum support
in that direction, allowing the highest lifting capacities.
Question 11: What is the most unstable quadrant of operation for a typical
boom truck?
A. Over the rear
B. Over the front
C. Over the side
D. All quadrants are equally stable
CORRECT ANSWER: C. Over the side
Guide & Exam Prep 2026–2027 | NCCCO TSS Certification Test Review |
Telescopic Boom Cranes Fixed Cab, TSS Written Exam, TSS Practical Exam,
NCCCO Core Exam, Crane Operations, Crane Safety, Load Charts, Rated
Capacity, Load Radius, Boom Length, Boom Angle, Wire Rope, Reeving, Parts
of Line, Crane Setup, Outriggers, Ground Conditions, Work Area Control,
Power Lines, Electrical Hazards, Signalperson Communication, Rigging,
Lifting Operations, Dynamic Loading, Stability, Crane Inspection, OSHA Crane
Safety & Operator Responsibilities | Practice Questions, Load Chart
Problems, Scenario-Based Review & Detailed Rationales
Question 1: What is the primary purpose of the load moment indicator (LMI) on
a telescopic boom crane?
A. To display the boom angle and length
B. To warn the operator when the load approaches the crane's rated capacity
C. To control the swing speed automatically
D. To measure wind speed at the boom tip
CORRECT ANSWER: B. To warn the operator when the load approaches the
crane's rated capacity
Rationale: The load moment indicator (LMI) continuously monitors the load
moment and warns the operator when the crane is approaching its rated
capacity, helping prevent overloading and tipping. It is a critical operational aid
that calculates the relationship between boom length, radius, and load weight.
Question 2: Under OSHA 1926 Subpart CC, what is the minimum clearance
distance for crane operation near power lines rated up to 50 kV?
A. 5 feet
B. 10 feet
C. 15 feet
D. 20 feet
CORRECT ANSWER: B. 10 feet
Rationale: OSHA Table A in 1926.1408 specifies that the minimum approach
distance for power lines up to 50 kV is 10 feet. This clearance must be maintained
between any part of the crane, load line, or load and the energized line.
,Question 3: When a telescopic boom crane is set up on outriggers, what is the
primary purpose of blocking or cribbing beneath the outrigger floats?
A. To increase the crane's lifting capacity beyond the load chart
B. To distribute the outrigger load over a larger ground area
C. To raise the crane to a higher operating position
D. To reduce hydraulic pressure in the outrigger cylinders
CORRECT ANSWER: B. To distribute the outrigger load over a larger ground area
Rationale: Blocking or cribbing spreads the concentrated outrigger reaction forces
over a larger surface area, reducing ground-bearing pressure and preventing
settlement or penetration that could compromise crane stability.
Question 4: Which condition would require the operator to immediately stop
operations and address the situation?
A. The load is swinging slightly due to wind
B. An outrigger begins to settle into the ground during a lift
C. The boom angle indicator reads slightly differently than expected
D. The signal person is using standard hand signals
CORRECT ANSWER: B. An outrigger begins to settle into the ground during a lift
Rationale: Outrigger settlement indicates a loss of ground support, which directly
affects crane stability and can lead to tipping or structural failure. The operator
must stop the lift immediately and address the ground-support problem before
continuing.
Question 5: What does the term "net capacity" represent on a crane load chart?
A. The maximum capacity of the crane with no deductions
B. The gross capacity minus all applicable deductions
C. The weight of the load only
D. The capacity listed for the shortest boom length
CORRECT ANSWER: B. The gross capacity minus all applicable deductions
Rationale: Net capacity is the actual available lifting capacity after deducting the
weight of all load-handling equipment such as hook blocks, headache balls,
rigging, and lifting beams from the gross rated capacity.
,Question 6: If a load weighs 15,000 lb, the hook block weighs 1,000 lb, and the
rigging weighs 500 lb, what is the minimum gross rated capacity required from
the load chart?
A. 15,000 lb
B. 15,500 lb
C. 16,000 lb
D. 16,500 lb
CORRECT ANSWER: D. 16,500 lb
Rationale: The gross rated capacity must be equal to or greater than the total load
comprising the load weight plus all deductions. Total = 15,000 + 1,000 + 500 =
16,500 lb.
Question 7: Which device is designed to prevent the load block from contacting
the boom tip?
A. Boom angle indicator
B. Anti-two-block device
C. Load moment indicator
D. Drum rotation indicator
CORRECT ANSWER: B. Anti-two-block device
Rationale: The anti-two-block device detects when the load block or headache
ball approaches the boom tip and either warns the operator or stops the
hazardous functions (hoist up, boom down, telescope out) to prevent contact and
potential wire rope failure.
Question 8: According to OSHA, what is the minimum number of wraps of wire
rope that must remain on the hoist drum at all times?
A. One wrap
B. Two wraps
C. Three wraps
D. Four wraps
CORRECT ANSWER: B. Two wraps
, Rationale: OSHA 1926.1416 requires that a minimum of two full wraps of wire
rope remain on the hoist drum at all times to ensure sufficient friction and
prevent the rope from slipping off the drum.
Question 9: When operating a telescopic boom crane, which factor most directly
determines the crane's rated capacity?
A. The color of the load
B. Boom length and load radius
C. The operator's experience level
D. The time of day
CORRECT ANSWER: B. Boom length and load radius
Rationale: Rated capacity is determined by the specific boom length and load
radius configuration as indicated in the manufacturer's load chart. As radius
increases or boom length changes, capacity generally decreases.
Question 10: What is the most stable quadrant of operation for a typical boom
truck?
A. Over the front
B. Over the rear
C. Over the side
D. All quadrants are equally stable
CORRECT ANSWER: B. Over the rear
Rationale: The rear quadrant of a boom truck provides the greatest stability
because the crane's counterweight and structural design offer maximum support
in that direction, allowing the highest lifting capacities.
Question 11: What is the most unstable quadrant of operation for a typical
boom truck?
A. Over the rear
B. Over the front
C. Over the side
D. All quadrants are equally stable
CORRECT ANSWER: C. Over the side
