NCCCO Telescopic Boom Crane – Fixed Cab (TSS) 2026/2027 | CCO Mobile Crane Operator TSS Certification Exam Study Guide, Practice Questions & Answers, Written & Practical Exam Prep, Crane Safety, Load Charts, Rigging, Inspection, Hoisting, Booming, Swingin

NCCCO Telescopic Boom Crane – Fixed Cab (TSS)
2026/2027 | CCO Mobile Crane Operator TSS
Certification Exam Study Guide, Practice Questions &
Answers, Written & Practical Exam Prep, Crane Safety,
Load Charts, Rigging, Inspection, Hoisting, Booming,
Swinging, Hand Signals, Operational Procedures &
Detailed Rationales

Question 1: What is the primary purpose of the Load Moment
Indicator (LMI) on a telescopic boom crane?
A. To measure wind speed and direction at the boom tip
B. To warn the operator when the load is swinging out of control
C. To indicate the load weight, boom angle, and radius to prevent
overloading
D. To display the crane's fuel consumption and engine hours
CORRECT ANSWER: C. To indicate the load weight, boom angle,
and radius to prevent overloading
Rationale: The LMI is a critical operator aid that continuously monitors
load weight, boom angle, and radius, comparing the actual condition to the
manufacturer's load chart to warn of overload. It does not measure wind or
fuel consumption.


Question 2: When is it permissible for a person to ride the
headache ball of a crane?
A. When the lift has been approved by a qualified engineer
B. When no other means of access is available
C. When other means of access would be more dangerous
D. It is never permissible under any circumstances
CORRECT ANSWER: D. It is never permissible under any
circumstances
Rationale: Federal OSHA regulations explicitly prohibit riding the headache
ball or hook under any circumstances. There are no exceptions based on
engineer approval, access needs, or relative danger.

,Question 3: A bold line on a load chart indicates that capacities
below that line:
A. Are based on the structural strength of the crane
B. Must not be used under any circumstances
C. Are based on the stability of the crane
D. Should only be used when the crane is on outriggers
CORRECT ANSWER: C. Are based on the stability of the crane
Rationale: On load charts, a bold line typically separates structural limits
from stability limits. Capacities listed below the bold line are governed by
stability (tipping) rather than structural strength.


Question 4: What is the function of the anti-two-block device on a
telescopic boom crane?
A. To prevent the boom from being lowered too rapidly
B. To prevent the load block from contacting the boom tip
C. To measure the weight of the load being lifted
D. To limit the swing speed of the superstructure
CORRECT ANSWER: B. To prevent the load block from contacting
the boom tip
Rationale: The anti-two-block device prevents the load block or headache
ball from being pulled into contact with the boom tip, which could cause
wire rope damage or catastrophic failure. It does not control lowering speed
or measure load weight.


Question 5: What is the maximum permissible speed for pick-and-
carry operations with a telescopic boom crane?
A. 5 mph
B. 10 mph
C. 15 mph
D. The manufacturer's recommended speed limit
CORRECT ANSWER: D. The manufacturer's recommended speed
limit

,Rationale: The manufacturer's load chart and operating manual specify the
maximum travel speed for pick-and-carry operations based on crane
configuration, tire capacity, and stability. Generic speed limits do not
account for specific machine variables.


Question 6: When using blocking under outrigger floats, the
operator must ensure the blocking is:
A. Made of hardwood only
B. Painted for high visibility
C. Sufficient to support and stabilize the crane
D. The same dimensions as the outrigger float
CORRECT ANSWER: C. Sufficient to support and stabilize the crane
Rationale: Blocking or cribbing must be adequate to distribute the outrigger
load and provide a stable foundation. The material type and size alone do
not guarantee adequacy; the blocking must be structurally sufficient for the
applied loads.


Question 7: What is the most unstable quadrant of operation for a
boom truck?
A. Over the rear
B. Over the front
C. Over the side
D. Over the corner
CORRECT ANSWER: C. Over the side
Rationale: The side quadrant provides the narrowest stability base for a
boom truck, making it the most unstable lifting position. The rear quadrant
is typically the most stable.


Question 8: What does the term "luffing jib" refer to on a telescopic
boom crane?
A. A jib that can change radius independent of the main boom
B. A jib that is fixed permanently at the boom tip

, C. A jib used only for lifting personnel platforms
D. A jib that must be removed before traveling
CORRECT ANSWER: A. A jib that can change radius independent of
the main boom
Rationale: A luffing jib is an articulated attachment that can be raised or
lowered independently of the main boom, allowing the operator to change
the working radius without changing the main boom angle.


Question 9: When are outrigger floats or pads required to be
fastened to the outrigger beams?
A. Only during transport on public highways
B. When the crane is set up for a lifting operation
C. Never; they should remain loose for quick removal
D. Only when working on soft or uneven ground
CORRECT ANSWER: B. When the crane is set up for a lifting
operation
Rationale: Outrigger floats must be securely fastened to the outrigger
beams during lifting operations to prevent shifting or detachment under
load, which could cause instability.


Question 10: What is required when operating a boom truck over
the front quadrant?
A. Extended outriggers only
B. A front stabilizer
C. A reduced load capacity of 50 percent
D. Two dedicated signal persons
CORRECT ANSWER: B. A front stabilizer
Rationale: The front of a boom truck typically has less structural support
than the rear. A front stabilizer is required to provide additional support and
stability when lifting over the front.