NCCCO TELESCOPIC BOOM CRANE – FIXED CAB (TSS) EXAM BANK |
ALL EXAM QUESTIONS AND ANSWERS WITH RATIONALES CURRENTLY
TESTING AND FREQUENTLY TESTED | EXPERT VERIFIED FOR
GUARANTEED PASS | LATEST UPDATE
Question 1
When a telescopic boom crane is used to lift a hook-suspended personnel platform, what safety
device is required to be operational?
A) A load moment indicator (LMI)
B) A boom length indicator
C) An anti-two-block device
D) A drum rotation indicator
E) A load-weighing device
Correct Answer: C) An anti-two-block device
Rationale: According to OSHA and ASME standards, an anti-two-block device is
mandatory when lifting personnel. This device prevents the load block or overhaul ball
from coming into contact with the boom tip sheave, which could cause the hoist line to part
and the platform to fall. It is a critical safety feature for personnel lifting operations.
Question 2
When the anti-two-block device on a telescopic boom crane is activated, which three functions
are typically disabled?
A) Swing, hoist up, and boom down
B) Hoist up, extend the boom, and boom down
C) Hoist down, retract the boom, and boom up
D) Swing, extend the boom, and hoist down
E) Boom up, hoist up, and retract the boom
Correct Answer: B) Hoist up, extend the boom, and boom down
Rationale: The purpose of the anti-two-block system is to prevent the block from hitting the
boom tip. The three functions that cause this to happen are hoisting the block up, extending
the boom out (which brings the tip closer to the block), and booming down (which also
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brings the tip closer to the block for a given line length). Therefore, these are the functions
that must be disabled.
Question 3
When performing a pick-and-carry operation with a telescopic boom crane, the safest maximum
travel speed is determined by:
A) The operator's judgment
B) The posted speed limit on the job site
C) The manufacturer's recommended speed limit
D) The maximum speed the crane is capable of traveling
E) The speed of other vehicles on the job site
Correct Answer: C) The manufacturer's recommended speed limit
Rationale: Pick-and-carry operations are high-risk due to the dynamic loads and potential
for tipping. The crane manufacturer determines the safe travel speeds based on the crane's
design, load, and configuration. These speeds are specified in the operator's manual and
load chart and must be strictly followed.
Question 4
When setting up a crane on outriggers, blocking is placed under the outrigger floats/pads. This
blocking must be:
A) At least three times smaller than the area of the outrigger pad.
B) Made of steel to prevent crushing.
C) Sufficient in size and strength to support and stabilize the crane and its load.
D) Placed directly on soft or uneven ground.
E) A single, thick piece of wood.
Correct Answer: C) Sufficient in size and strength to support and stabilize the crane and its
load.
Rationale: The purpose of blocking (also known as cribbing or dunnage) is to distribute the
immense pressure from the outrigger pad over a larger surface area to prevent the ground
from failing. The blocking must be strong enough to not be crushed, large enough to create
the required surface area, and properly assembled to provide a stable base.
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Question 5
When a boom extension (jib) is in the stowed position, it is attached to which part of the boom?
A) The boom tip section
B) The boom base section
C) The underside of the entire boom
D) The crane's superstructure
E) The carrier chassis
Correct Answer: B) The boom base section
Rationale: For transport and when not in use, the boom extension is typically folded or
retracted and secured with pins along the side or top of the main boom's base section (the
thickest section closest to the cab).
Question 6
When a telescopic boom crane is performing a pick-and-carry operation (on rubber), the rated
capacity is based on what percentage of the load that would cause the crane to tip?
A) 100%
B) 85%
C) 75%
D) 66%
E) 50%
Correct Answer: C) 75%
Rationale: Crane stability ratings are based on a percentage of the tipping load to provide a
margin of safety. For stationary lifts on outriggers, the rating is 85% of the tipping
capacity. For pick-and-carry operations on rubber tires, which are less stable, the rating is
reduced to 75% of the tipping capacity.
Question 7
According to OSHA 1926 Subpart CC, all telescopic boom cranes must be equipped with which
of the following?
A) An anemometer (wind speed indicator)
B) A boom angle indicator
C) A backup camera
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D) A radio remote control
E) A fire suppression system in the cab
Correct Answer: B) A boom angle indicator
Rationale: OSHA 1926.1482 requires all cranes to have a boom angle or radius indicator
that is readily visible to the operator. Boom angle is a critical piece of information used in
conjunction with boom length to determine the load radius and verify the crane's capacity
from the load chart.
Question 8
Capacities listed for a jib (boom extension) are primarily based on:
A) The tipping stability of the crane
B) The structural strength of the jib
C) The capacity of the hoist winch
D) The strength of the hoist rope
E) The ground conditions
Correct Answer: B) The structural strength of the jib
Rationale: Jibs are lightweight, lattice-style structures designed for lifting lighter loads to
greater heights or radii. Their capacity is almost always limited by their own structural
integrity (their ability to resist bending and buckling), not by the tipping stability of the
crane.
Question 9
When a crane is set up on outriggers and making a lift over a corner, the ground pressure under
that one outrigger can approach a weight that is:
A) Equal to the weight of the suspended load only.
B) Equal to the total weight of the crane.
C) Equal to the total weight of the crane plus the weight of the suspended load.
D) Half the total weight of the crane and load.
E) Unchanged from the pressure when no load is lifted.
Correct Answer: C) Equal to the total weight of the crane plus the weight of the suspended
load.
ALL EXAM QUESTIONS AND ANSWERS WITH RATIONALES CURRENTLY
TESTING AND FREQUENTLY TESTED | EXPERT VERIFIED FOR
GUARANTEED PASS | LATEST UPDATE
Question 1
When a telescopic boom crane is used to lift a hook-suspended personnel platform, what safety
device is required to be operational?
A) A load moment indicator (LMI)
B) A boom length indicator
C) An anti-two-block device
D) A drum rotation indicator
E) A load-weighing device
Correct Answer: C) An anti-two-block device
Rationale: According to OSHA and ASME standards, an anti-two-block device is
mandatory when lifting personnel. This device prevents the load block or overhaul ball
from coming into contact with the boom tip sheave, which could cause the hoist line to part
and the platform to fall. It is a critical safety feature for personnel lifting operations.
Question 2
When the anti-two-block device on a telescopic boom crane is activated, which three functions
are typically disabled?
A) Swing, hoist up, and boom down
B) Hoist up, extend the boom, and boom down
C) Hoist down, retract the boom, and boom up
D) Swing, extend the boom, and hoist down
E) Boom up, hoist up, and retract the boom
Correct Answer: B) Hoist up, extend the boom, and boom down
Rationale: The purpose of the anti-two-block system is to prevent the block from hitting the
boom tip. The three functions that cause this to happen are hoisting the block up, extending
the boom out (which brings the tip closer to the block), and booming down (which also
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brings the tip closer to the block for a given line length). Therefore, these are the functions
that must be disabled.
Question 3
When performing a pick-and-carry operation with a telescopic boom crane, the safest maximum
travel speed is determined by:
A) The operator's judgment
B) The posted speed limit on the job site
C) The manufacturer's recommended speed limit
D) The maximum speed the crane is capable of traveling
E) The speed of other vehicles on the job site
Correct Answer: C) The manufacturer's recommended speed limit
Rationale: Pick-and-carry operations are high-risk due to the dynamic loads and potential
for tipping. The crane manufacturer determines the safe travel speeds based on the crane's
design, load, and configuration. These speeds are specified in the operator's manual and
load chart and must be strictly followed.
Question 4
When setting up a crane on outriggers, blocking is placed under the outrigger floats/pads. This
blocking must be:
A) At least three times smaller than the area of the outrigger pad.
B) Made of steel to prevent crushing.
C) Sufficient in size and strength to support and stabilize the crane and its load.
D) Placed directly on soft or uneven ground.
E) A single, thick piece of wood.
Correct Answer: C) Sufficient in size and strength to support and stabilize the crane and its
load.
Rationale: The purpose of blocking (also known as cribbing or dunnage) is to distribute the
immense pressure from the outrigger pad over a larger surface area to prevent the ground
from failing. The blocking must be strong enough to not be crushed, large enough to create
the required surface area, and properly assembled to provide a stable base.
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Question 5
When a boom extension (jib) is in the stowed position, it is attached to which part of the boom?
A) The boom tip section
B) The boom base section
C) The underside of the entire boom
D) The crane's superstructure
E) The carrier chassis
Correct Answer: B) The boom base section
Rationale: For transport and when not in use, the boom extension is typically folded or
retracted and secured with pins along the side or top of the main boom's base section (the
thickest section closest to the cab).
Question 6
When a telescopic boom crane is performing a pick-and-carry operation (on rubber), the rated
capacity is based on what percentage of the load that would cause the crane to tip?
A) 100%
B) 85%
C) 75%
D) 66%
E) 50%
Correct Answer: C) 75%
Rationale: Crane stability ratings are based on a percentage of the tipping load to provide a
margin of safety. For stationary lifts on outriggers, the rating is 85% of the tipping
capacity. For pick-and-carry operations on rubber tires, which are less stable, the rating is
reduced to 75% of the tipping capacity.
Question 7
According to OSHA 1926 Subpart CC, all telescopic boom cranes must be equipped with which
of the following?
A) An anemometer (wind speed indicator)
B) A boom angle indicator
C) A backup camera
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D) A radio remote control
E) A fire suppression system in the cab
Correct Answer: B) A boom angle indicator
Rationale: OSHA 1926.1482 requires all cranes to have a boom angle or radius indicator
that is readily visible to the operator. Boom angle is a critical piece of information used in
conjunction with boom length to determine the load radius and verify the crane's capacity
from the load chart.
Question 8
Capacities listed for a jib (boom extension) are primarily based on:
A) The tipping stability of the crane
B) The structural strength of the jib
C) The capacity of the hoist winch
D) The strength of the hoist rope
E) The ground conditions
Correct Answer: B) The structural strength of the jib
Rationale: Jibs are lightweight, lattice-style structures designed for lifting lighter loads to
greater heights or radii. Their capacity is almost always limited by their own structural
integrity (their ability to resist bending and buckling), not by the tipping stability of the
crane.
Question 9
When a crane is set up on outriggers and making a lift over a corner, the ground pressure under
that one outrigger can approach a weight that is:
A) Equal to the weight of the suspended load only.
B) Equal to the total weight of the crane.
C) Equal to the total weight of the crane plus the weight of the suspended load.
D) Half the total weight of the crane and load.
E) Unchanged from the pressure when no load is lifted.
Correct Answer: C) Equal to the total weight of the crane plus the weight of the suspended
load.
