EICA MOBILE CRANE & DIGGER DERRICK EXAM 2026/2027 |
Questions with Complete Solutions | Crane Operator
Certification | Pass Guaranteed - A+ Graded
Mobile Crane & Digger Derrick Safety Fundamentals
Q1: A truck-mounted crane is being used to lift materials on a commercial construction
site. Which of the following best describes the primary difference between a
truck-mounted crane and a rough terrain crane?
A. Truck-mounted cranes have higher lifting capacities than rough terrain cranes
B. Truck-mounted cranes are designed for highway travel and require outriggers for
lifting, while rough terrain cranes have all-wheel drive and rubber tires for off-road
mobility without needing outriggers [CORRECT]
C. Rough terrain cranes cannot use load charts and must rely on operator experience
D. Truck-mounted cranes are exempt from OSHA crane standards
Correct Answer: B
Rationale: Truck-mounted cranes (commercial chassis) travel on highways but need
outriggers for stability during lifts. Rough terrain cranes (RTs) have 4x4 capability, large
flotation tires, and can operate on unimproved surfaces, though they still use outriggers
for lifting. Option A is incorrect as capacity varies by model; C is false as all cranes use
load charts; D is incorrect as truck-mounted cranes are fully covered by OSHA
1926.1400.
Q2: An operator is setting up a digger derrick for pole-setting operations near energized
power lines. According to OSHA 1926 Subpart V and the 10-foot rule, what is the
minimum safe approach distance for a digger derrick operating near 50kV power lines?
A. 5 feet
,B. 10 feet [CORRECT]
C. 15 feet
D. 20 feet
Correct Answer: B
Rationale: OSHA's 10-foot rule (1926.1408) requires minimum 10 feet clearance for
cranes/digger derricks near power lines up to 50kV. Higher voltages require greater
distances (15 feet for 50-200kV, 20 feet for 200-350kV). The 10-foot rule is the baseline
requirement for standard distribution voltages.
Q3: Which of the following is a key safety feature required on modern mobile cranes to
prevent two-blocking?
A. Load moment indicator (LMI) only
B. Anti-two-block (A2B) warning system or damage prevention feature [CORRECT]
C. Outrigger position monitoring only
D. Wind speed indicator only
Correct Answer: B
Rationale: Anti-two-block (A2B) devices are required by OSHA 1926.1416 to prevent the
hook block or load from contacting the boom tip, which could damage wire rope or
cause structural failure. LMIs (A) prevent overloads but not two-blocking; outrigger
monitors (C) and wind indicators (D) serve different safety functions.
Q4: A digger derrick operator is preparing to use the auger function to dig a pole hole.
Which of the following describes a key difference between digger derrick auger
operations and crane lifting operations?
A. Digger derricks are not required to have load charts for auger operations
B. Auger operations generate torque reactions that must be considered for stability,
unlike vertical lifting [CORRECT]
C. Auger operations are exempt from OSHA crane standards entirely
,D. Digger derricks cannot use outriggers during auger operations
Correct Answer: B
Rationale: Digger derrick auger operations create rotational forces (torque) that affect
stability differently than vertical lifts. OSHA 1926.1400 Subpart CC covers digger
derricks used for lifting, with specific provisions for their unique operations. Option A is
false as capacity charts are required; C is false as lifting operations are covered; D is
false as outriggers are typically used.
Q5: According to ANSI/ASME B30.5, which of the following is considered a "critical lift"
requiring additional planning and supervision?
A. Any lift over 1,000 pounds
B. Lifts where the load exceeds 75% of rated capacity, lifts over personnel, or lifts
involving two or more cranes [CORRECT]
C. Only lifts performed in high winds
D. Any lift using synthetic slings
Correct Answer: B
Rationale: Critical lifts involve higher risk factors: near-capacity loads (75%+), personnel
lifting (man-baskets), or multi-crane picks. These require written lift plans, engineering
review, and enhanced supervision. The 75% threshold is the industry standard, not 1,000
lbs (A), winds alone (C), or sling type (D).
Q6: An operator is inspecting wire rope on a mobile crane before the shift. According to
OSHA and ANSI standards, which condition would require immediate replacement of
the rope?
A. Slight surface rust that wipes off with a rag
B. Six randomly distributed broken wires in one rope lay or three broken wires in one
strand in one lay [CORRECT]
C. Minor surface wear on outer wires
, D. Slight discoloration from lubricant
Correct Answer: B
Rationale: ASME B30.5 and OSHA 1926.1413 specify removal criteria: 6 randomly
distributed broken wires in one lay, or 3 broken wires in one strand in one lay. Surface
rust (A), minor wear (C), and discoloration (D) don't meet replacement thresholds.
Q7: Which type of mobile crane is specifically designed to travel on both paved
highways and rough terrain, featuring multiple axles with all-wheel steering and drive?
A. Truck-mounted crane
B. Rough terrain crane
C. All-terrain crane [CORRECT]
D. Crawler crane
Correct Answer: C
Rationale: All-terrain (AT) cranes combine highway travel capability (multiple axles, road
tires) with off-road performance (all-wheel drive, all-wheel steering, outriggers).
Truck-mounted (A) is highway-only; rough terrain (B) is off-road optimized; crawler (D)
uses tracks and requires transport.
Q8: A signal person is directing a crane operator using hand signals. According to OSHA
1926.1419, when must a signal person be provided?
A. Only when the operator cannot see the load
B. When the operator cannot see the load or load's travel path, when the load is near
power lines, or when the operator requests assistance [CORRECT]
C. Only for lifts over 10,000 pounds
D. Only when using radio communication
Correct Answer: B
Questions with Complete Solutions | Crane Operator
Certification | Pass Guaranteed - A+ Graded
Mobile Crane & Digger Derrick Safety Fundamentals
Q1: A truck-mounted crane is being used to lift materials on a commercial construction
site. Which of the following best describes the primary difference between a
truck-mounted crane and a rough terrain crane?
A. Truck-mounted cranes have higher lifting capacities than rough terrain cranes
B. Truck-mounted cranes are designed for highway travel and require outriggers for
lifting, while rough terrain cranes have all-wheel drive and rubber tires for off-road
mobility without needing outriggers [CORRECT]
C. Rough terrain cranes cannot use load charts and must rely on operator experience
D. Truck-mounted cranes are exempt from OSHA crane standards
Correct Answer: B
Rationale: Truck-mounted cranes (commercial chassis) travel on highways but need
outriggers for stability during lifts. Rough terrain cranes (RTs) have 4x4 capability, large
flotation tires, and can operate on unimproved surfaces, though they still use outriggers
for lifting. Option A is incorrect as capacity varies by model; C is false as all cranes use
load charts; D is incorrect as truck-mounted cranes are fully covered by OSHA
1926.1400.
Q2: An operator is setting up a digger derrick for pole-setting operations near energized
power lines. According to OSHA 1926 Subpart V and the 10-foot rule, what is the
minimum safe approach distance for a digger derrick operating near 50kV power lines?
A. 5 feet
,B. 10 feet [CORRECT]
C. 15 feet
D. 20 feet
Correct Answer: B
Rationale: OSHA's 10-foot rule (1926.1408) requires minimum 10 feet clearance for
cranes/digger derricks near power lines up to 50kV. Higher voltages require greater
distances (15 feet for 50-200kV, 20 feet for 200-350kV). The 10-foot rule is the baseline
requirement for standard distribution voltages.
Q3: Which of the following is a key safety feature required on modern mobile cranes to
prevent two-blocking?
A. Load moment indicator (LMI) only
B. Anti-two-block (A2B) warning system or damage prevention feature [CORRECT]
C. Outrigger position monitoring only
D. Wind speed indicator only
Correct Answer: B
Rationale: Anti-two-block (A2B) devices are required by OSHA 1926.1416 to prevent the
hook block or load from contacting the boom tip, which could damage wire rope or
cause structural failure. LMIs (A) prevent overloads but not two-blocking; outrigger
monitors (C) and wind indicators (D) serve different safety functions.
Q4: A digger derrick operator is preparing to use the auger function to dig a pole hole.
Which of the following describes a key difference between digger derrick auger
operations and crane lifting operations?
A. Digger derricks are not required to have load charts for auger operations
B. Auger operations generate torque reactions that must be considered for stability,
unlike vertical lifting [CORRECT]
C. Auger operations are exempt from OSHA crane standards entirely
,D. Digger derricks cannot use outriggers during auger operations
Correct Answer: B
Rationale: Digger derrick auger operations create rotational forces (torque) that affect
stability differently than vertical lifts. OSHA 1926.1400 Subpart CC covers digger
derricks used for lifting, with specific provisions for their unique operations. Option A is
false as capacity charts are required; C is false as lifting operations are covered; D is
false as outriggers are typically used.
Q5: According to ANSI/ASME B30.5, which of the following is considered a "critical lift"
requiring additional planning and supervision?
A. Any lift over 1,000 pounds
B. Lifts where the load exceeds 75% of rated capacity, lifts over personnel, or lifts
involving two or more cranes [CORRECT]
C. Only lifts performed in high winds
D. Any lift using synthetic slings
Correct Answer: B
Rationale: Critical lifts involve higher risk factors: near-capacity loads (75%+), personnel
lifting (man-baskets), or multi-crane picks. These require written lift plans, engineering
review, and enhanced supervision. The 75% threshold is the industry standard, not 1,000
lbs (A), winds alone (C), or sling type (D).
Q6: An operator is inspecting wire rope on a mobile crane before the shift. According to
OSHA and ANSI standards, which condition would require immediate replacement of
the rope?
A. Slight surface rust that wipes off with a rag
B. Six randomly distributed broken wires in one rope lay or three broken wires in one
strand in one lay [CORRECT]
C. Minor surface wear on outer wires
, D. Slight discoloration from lubricant
Correct Answer: B
Rationale: ASME B30.5 and OSHA 1926.1413 specify removal criteria: 6 randomly
distributed broken wires in one lay, or 3 broken wires in one strand in one lay. Surface
rust (A), minor wear (C), and discoloration (D) don't meet replacement thresholds.
Q7: Which type of mobile crane is specifically designed to travel on both paved
highways and rough terrain, featuring multiple axles with all-wheel steering and drive?
A. Truck-mounted crane
B. Rough terrain crane
C. All-terrain crane [CORRECT]
D. Crawler crane
Correct Answer: C
Rationale: All-terrain (AT) cranes combine highway travel capability (multiple axles, road
tires) with off-road performance (all-wheel drive, all-wheel steering, outriggers).
Truck-mounted (A) is highway-only; rough terrain (B) is off-road optimized; crawler (D)
uses tracks and requires transport.
Q8: A signal person is directing a crane operator using hand signals. According to OSHA
1926.1419, when must a signal person be provided?
A. Only when the operator cannot see the load
B. When the operator cannot see the load or load's travel path, when the load is near
power lines, or when the operator requests assistance [CORRECT]
C. Only for lifts over 10,000 pounds
D. Only when using radio communication
Correct Answer: B
