EICA Mobile Crane &
Digger Derrick Questions
With Complete Solutions
1. What is the primary purpose of a crane load chart?
A. To calculate fuel consumption
B. To determine safe lifting capacity under specific conditions
C. To identify crane manufacturer
D. To set engine RPM
Answer: B
The load chart specifies the maximum safe lifting capacity based on boom length,
radius, and configuration.
2. The lifting capacity of a crane decreases as:
A. Boom angle increases
B. Radius decreases
C. Radius increases
D. Counterweight increases
Answer: C
As the working radius increases, lifting capacity decreases.
3. What is the function of outriggers?
,A. Increase fuel efficiency
B. Stabilize the crane and increase lifting capacity
C. Increase boom length
D. Control load swing
Answer: B
4. Before lifting a load, the operator must:
A. Rev engine to maximum
B. Check ground stability
C. Remove counterweights
D. Fully extend boom
Answer: B
5. The term “radius” refers to:
A. Distance from boom tip to ground
B. Distance from crane center of rotation to load center
C. Boom length
D. Outrigger width
Answer: B
6. A two-block condition occurs when:
A. Boom collapses
B. Load exceeds capacity
C. Hook block contacts boom tip
D. Crane tips over
, Answer: C
7. Anti-two block devices are designed to:
A. Prevent boom collapse
B. Stop hoist movement before contact occurs
C. Increase lift speed
D. Reduce swing
Answer: B
8. The most common cause of crane tip-overs is:
A. Wind
B. Mechanical failure
C. Overloading
D. Poor communication
Answer: C
9. When working near power lines, OSHA minimum clearance up to 50kV is:
A. 5 feet
B. 10 feet
C. 15 feet
D. 20 feet
Answer: B
10. A signal person must be:
Digger Derrick Questions
With Complete Solutions
1. What is the primary purpose of a crane load chart?
A. To calculate fuel consumption
B. To determine safe lifting capacity under specific conditions
C. To identify crane manufacturer
D. To set engine RPM
Answer: B
The load chart specifies the maximum safe lifting capacity based on boom length,
radius, and configuration.
2. The lifting capacity of a crane decreases as:
A. Boom angle increases
B. Radius decreases
C. Radius increases
D. Counterweight increases
Answer: C
As the working radius increases, lifting capacity decreases.
3. What is the function of outriggers?
,A. Increase fuel efficiency
B. Stabilize the crane and increase lifting capacity
C. Increase boom length
D. Control load swing
Answer: B
4. Before lifting a load, the operator must:
A. Rev engine to maximum
B. Check ground stability
C. Remove counterweights
D. Fully extend boom
Answer: B
5. The term “radius” refers to:
A. Distance from boom tip to ground
B. Distance from crane center of rotation to load center
C. Boom length
D. Outrigger width
Answer: B
6. A two-block condition occurs when:
A. Boom collapses
B. Load exceeds capacity
C. Hook block contacts boom tip
D. Crane tips over
, Answer: C
7. Anti-two block devices are designed to:
A. Prevent boom collapse
B. Stop hoist movement before contact occurs
C. Increase lift speed
D. Reduce swing
Answer: B
8. The most common cause of crane tip-overs is:
A. Wind
B. Mechanical failure
C. Overloading
D. Poor communication
Answer: C
9. When working near power lines, OSHA minimum clearance up to 50kV is:
A. 5 feet
B. 10 feet
C. 15 feet
D. 20 feet
Answer: B
10. A signal person must be:
