NCCCO TELESCOPIC BOOM CRANE – FIXED
CAB (TSS) PRACTICE EXAM 350
MULTIPLECHOICE QUESTIONS WITH
ANSWERS AND RATIONALES
SECTION 1: CRANE COMPONENTS AND IDENTIFICATION (Questions 135)
1. What is the primary distinguishing characteristic of a Telescopic Boom
Crane – Fixed Cab (TSS) as defined by NCCCO?
A) The cab rotates with the boom
B) The operator's station does not rotate with the boom
C) The crane has more than four axles
D) The boom is made of lattice sections
Correct Answer: B
Rationale: A TSS crane has a fixed (nonrotating) operator's station. The cab
remains stationary while the boom rotates above it. This distinguishes it from
a Swing Cab (TLL) crane where the operator's station rotates with the upper
works.
2. Which of the following best describes the boom type used on a TSS crane?
,A) Lattice boom
B) Telescopic boom
C) Fixed length boom
D) Articulating boom
Correct Answer: B
Rationale: TSS stands for Telescopic Boom – Fixed Cab. The boom consists of
nested sections that extend and retract hydraulically, allowing variable reach
and height.
3. The antitwoblock device on a telescopic boom crane is designed to prevent:
A) The boom from collapsing
B) The load from swinging
C) The hook block from contacting the boom tip
D) The crane from tipping over
Correct Answer: C
Rationale: An antitwoblock (A2B) device prevents the load hook or hook block
from contacting the boom tip sheave, which could damage the wire rope and
cause failure. It is a critical safety device required by OSHA and ASME
standards.
4. What is the function of the boom angle indicator?
,A) To show the weight of the load
B) To indicate the angle of the boom relative to horizontal
C) To measure wind speed
D) To display hydraulic pressure
Correct Answer: B
Rationale: The boom angle indicator displays the angle of the boom relative to
the horizontal plane. This information is essential for load chart calculations
as the crane's capacity varies with boom angle.
5. The load moment indicator (LMI) on a TSS crane provides the operator
with:
A) The current wind speed reading
B) Visual and audible warnings when approaching capacity limits
C) The distance to the nearest power line
D) The crane's fuel level
Correct Answer: B
Rationale: The LMI monitors load weight, boom angle, and radius to warn the
operator when the crane approaches or exceeds its rated capacity. It may also
prevent operation in unsafe conditions.
6. On a fixed cab crane, the operator's cab is typically located:
, A) On the rotating upper structure
B) On the nonrotating carrier or chassis
C) At the tip of the boom
D) On the counterweight
Correct Answer: B
Rationale: In a fixed cab crane, the operator's cab is mounted on the
nonrotating carrier or chassis. This means the operator does not rotate with
the boom during operation.
7. What does the term "boom hoist" refer to?
A) The mechanism that extends the boom sections
B) The mechanism that raises and lowers the boom angle
C) The device that lifts the load
D) The system that rotates the crane
Correct Answer: B
Rationale: The boom hoist is the mechanism (typically hydraulic cylinders)
that raises and lowers the boom to change its angle relative to the ground.
8. The swing mechanism on a TSS crane allows the boom to:
A) Extend and retract
CAB (TSS) PRACTICE EXAM 350
MULTIPLECHOICE QUESTIONS WITH
ANSWERS AND RATIONALES
SECTION 1: CRANE COMPONENTS AND IDENTIFICATION (Questions 135)
1. What is the primary distinguishing characteristic of a Telescopic Boom
Crane – Fixed Cab (TSS) as defined by NCCCO?
A) The cab rotates with the boom
B) The operator's station does not rotate with the boom
C) The crane has more than four axles
D) The boom is made of lattice sections
Correct Answer: B
Rationale: A TSS crane has a fixed (nonrotating) operator's station. The cab
remains stationary while the boom rotates above it. This distinguishes it from
a Swing Cab (TLL) crane where the operator's station rotates with the upper
works.
2. Which of the following best describes the boom type used on a TSS crane?
,A) Lattice boom
B) Telescopic boom
C) Fixed length boom
D) Articulating boom
Correct Answer: B
Rationale: TSS stands for Telescopic Boom – Fixed Cab. The boom consists of
nested sections that extend and retract hydraulically, allowing variable reach
and height.
3. The antitwoblock device on a telescopic boom crane is designed to prevent:
A) The boom from collapsing
B) The load from swinging
C) The hook block from contacting the boom tip
D) The crane from tipping over
Correct Answer: C
Rationale: An antitwoblock (A2B) device prevents the load hook or hook block
from contacting the boom tip sheave, which could damage the wire rope and
cause failure. It is a critical safety device required by OSHA and ASME
standards.
4. What is the function of the boom angle indicator?
,A) To show the weight of the load
B) To indicate the angle of the boom relative to horizontal
C) To measure wind speed
D) To display hydraulic pressure
Correct Answer: B
Rationale: The boom angle indicator displays the angle of the boom relative to
the horizontal plane. This information is essential for load chart calculations
as the crane's capacity varies with boom angle.
5. The load moment indicator (LMI) on a TSS crane provides the operator
with:
A) The current wind speed reading
B) Visual and audible warnings when approaching capacity limits
C) The distance to the nearest power line
D) The crane's fuel level
Correct Answer: B
Rationale: The LMI monitors load weight, boom angle, and radius to warn the
operator when the crane approaches or exceeds its rated capacity. It may also
prevent operation in unsafe conditions.
6. On a fixed cab crane, the operator's cab is typically located:
, A) On the rotating upper structure
B) On the nonrotating carrier or chassis
C) At the tip of the boom
D) On the counterweight
Correct Answer: B
Rationale: In a fixed cab crane, the operator's cab is mounted on the
nonrotating carrier or chassis. This means the operator does not rotate with
the boom during operation.
7. What does the term "boom hoist" refer to?
A) The mechanism that extends the boom sections
B) The mechanism that raises and lowers the boom angle
C) The device that lifts the load
D) The system that rotates the crane
Correct Answer: B
Rationale: The boom hoist is the mechanism (typically hydraulic cylinders)
that raises and lowers the boom to change its angle relative to the ground.
8. The swing mechanism on a TSS crane allows the boom to:
A) Extend and retract
