NCCCO CORE CERTIFICATION EXAM 200
COMPLETE QUESTIONS AND VERIFIED ANSWERS
WITH RATIONALE ALREADY GRADED A+
NEW!!!!!!!!!!!!!!!!!!
1. What is the minimum distance that must be maintained from power lines
when the voltage is 50 kV?
A) 5 feet
B) 10 feet
C) 15 feet
D) 20 feet
Answer B: 10 feet
Rationale: OSHA requires a minimum clearance of 10 feet for lines up to 50 kV.
Add 4 inches for each additional 10 kV.
2. Which part of the crane is used to support the load and provide leverage?
A) Boom
B) Boom (yes)
C) Counterweight
D) Outriggers
Answer A: Boom
,Rationale: The boom is the main structural component used to support and
position the load.
3. What is the purpose of outriggers?
A) Increase lifting capacity
B) Stabilize the crane and reduce tipping
C) Increase boom length
D) Adjust load radius
Answer B: Stabilize the crane and reduce tipping
Rationale: Outriggers extend from the carrier to provide a wider base, increasing
stability.
4. The rated capacity of a crane is based on:
A) Boom angle only
B) Load radius and boom length
C) Wind speed
D) Ground condition
Answer B: Load radius and boom length
Rationale: Load charts specify rated capacity based on the load radius (distance
from center of rotation) and boom length.
5. What does the term "tip angle" refer to?
,A) The boom angle at maximum capacity
B) The angle at which the crane would tip over
C) The angle of the outriggers
D) The swing angle
Answer B: The angle at which the crane would tip over
Rationale: Tip angle is the boom angle at which the crane becomes unstable and
would tip.
6. Which type of sling is most resistant to abrasion?
A) Wire rope sling
B) Synthetic web sling
C) Chain sling
D) Round sling
Answer C: Chain sling
Rationale: Chain slings are highly durable and abrasion-resistant, but they are
heavier and more expensive.
7. The maximum safe working load for a sling decreases as the angle of the
legs:
A) Increases
B) Decreases
C) Remains the same
D) Doubles
, Answer B: Decreases
Rationale: As the angle between sling legs decreases, the tension on each leg
increases, reducing the safe working load.
8. What is the minimum D/d ratio recommended for wire rope?
A) 10:1
B) 20:1
C) 30:1
D) 40:1
Answer B: 20:1
Rationale: A D/d ratio (sheave diameter to rope diameter) of at least 20:1
minimizes bending stress and extends rope life.
9. The crane operator should perform a pre-operational inspection:
A) Once a month
B) Daily
C) Weekly
D) At the beginning of each shift
Answer D: At the beginning of each shift
Rationale: OSHA and ASME require a pre-operational inspection before each shift
to ensure safe operation.
COMPLETE QUESTIONS AND VERIFIED ANSWERS
WITH RATIONALE ALREADY GRADED A+
NEW!!!!!!!!!!!!!!!!!!
1. What is the minimum distance that must be maintained from power lines
when the voltage is 50 kV?
A) 5 feet
B) 10 feet
C) 15 feet
D) 20 feet
Answer B: 10 feet
Rationale: OSHA requires a minimum clearance of 10 feet for lines up to 50 kV.
Add 4 inches for each additional 10 kV.
2. Which part of the crane is used to support the load and provide leverage?
A) Boom
B) Boom (yes)
C) Counterweight
D) Outriggers
Answer A: Boom
,Rationale: The boom is the main structural component used to support and
position the load.
3. What is the purpose of outriggers?
A) Increase lifting capacity
B) Stabilize the crane and reduce tipping
C) Increase boom length
D) Adjust load radius
Answer B: Stabilize the crane and reduce tipping
Rationale: Outriggers extend from the carrier to provide a wider base, increasing
stability.
4. The rated capacity of a crane is based on:
A) Boom angle only
B) Load radius and boom length
C) Wind speed
D) Ground condition
Answer B: Load radius and boom length
Rationale: Load charts specify rated capacity based on the load radius (distance
from center of rotation) and boom length.
5. What does the term "tip angle" refer to?
,A) The boom angle at maximum capacity
B) The angle at which the crane would tip over
C) The angle of the outriggers
D) The swing angle
Answer B: The angle at which the crane would tip over
Rationale: Tip angle is the boom angle at which the crane becomes unstable and
would tip.
6. Which type of sling is most resistant to abrasion?
A) Wire rope sling
B) Synthetic web sling
C) Chain sling
D) Round sling
Answer C: Chain sling
Rationale: Chain slings are highly durable and abrasion-resistant, but they are
heavier and more expensive.
7. The maximum safe working load for a sling decreases as the angle of the
legs:
A) Increases
B) Decreases
C) Remains the same
D) Doubles
, Answer B: Decreases
Rationale: As the angle between sling legs decreases, the tension on each leg
increases, reducing the safe working load.
8. What is the minimum D/d ratio recommended for wire rope?
A) 10:1
B) 20:1
C) 30:1
D) 40:1
Answer B: 20:1
Rationale: A D/d ratio (sheave diameter to rope diameter) of at least 20:1
minimizes bending stress and extends rope life.
9. The crane operator should perform a pre-operational inspection:
A) Once a month
B) Daily
C) Weekly
D) At the beginning of each shift
Answer D: At the beginning of each shift
Rationale: OSHA and ASME require a pre-operational inspection before each shift
to ensure safe operation.
