NCCCO Core and Mobile Crane Operator | National Commission for the
Certification of Crane Operators | Academic Year 2026/2027 |
Comprehensive Certification Examination | Verified Questions and
Correct Answer Rationales
1. On a mobile cranes range diagram, boom length and boom angle can be used to
determine? - ANSWERS-Load radius
2. On a mobile crane, what is the weight of the slowed jib that is deducted in load chart
calculations called? - ANSWERS-Effective weight
3. When determining boom tip elevation for a mobile crane, the user could: use the
range diagram - ANSWERS-use the range diagram
4. When lifting off the main boom, how is the effective weight of the flyjib different in the
erected position from that of the stowed position? - ANSWERS-Effective weight
increasses
5. Why do most crane manufacturers reduce load capacity for duty-cycle operations? -
ANSWERS-Side loading forces may occur
6. What is the difference between anti-two-block warning device and an anti-two-block
prevention device? - ANSWERS-Warning device only warns, but prevention devices
will stop the functions
7. How can the LMI's boom length or load radius reading be verified? - ANSWERS-Actual
measurements
8. On mobile cranes, what does the boom angle indicator show the operator? -
ANSWERS-Angle of boom to horizontal
9. What is the device called that automatically stops the boom when it nears the cranes
maximum angle? - ANSWERS-Boom hoist limiting
10. When the number of layers of wire rope on a drum increases the: - ANSWERS-
Allowable line pull decreases
11. On a mobile crane, side loading of the boom could be caused by which of the
following? - ANSWERS-Starting or stopping the swing too rapidly
12. Which person listed below, has the responsibility for determining the correct weight
of a load? - ANSWERS-Lift Director
13. What must an operator do when an operator leaves the controls of the crane from an
extended period of time? - ANSWERS-Apply all brakes and dogs, and lower the load
to the ground
, 14. When should a tag line be used, during the hoisting of material? - ANSWERS-When
the rotation of the load would be dangerous
15. What percentage of the rated capacity of a mobile crane must be used when lifting
with two cranes attached to the same load? - ANSWERS-75%
16. When lifting a load with two mobile cranes, it is very important to: - ANSWERS-Keep
the hoist lines of both cranes vertical
17. If lifting a load with two mobile cranes of different rated capacities, the crane with the
larger rated capacity should: - ANSWERS-Be hooked at a distance closer to the loads
center of gravity
18. When performing a multiple crane lift is is important for the operator's of each crane
to understand that: - ANSWERS-The weight may increase if the other crane lands the
load
19. When lifting loads that are submerged under water with a mobile crane, what is one
of the conditions that the operator should be familiar with? - ANSWERS-Load will
increase when lifting the load out of the water
20. When lifting over water with a personnel platform, what are the occupants of the
platform required to wear? - ANSWERS-A floatation device
21. What is the minimum pitch diameter used for sheaves in a boom hoist reeving system
using rotation resistant wire rope? - ANSWERS-Not less than 18 times rope diameter
22. When can capacity altering modifications be made to mobile cranes? - ANSWERS-
When permission is given by the crane manufacturer
23. A crane is at the point of instability when the crane's leverage on the load equals: -
ANSWERS-100% of the load's leverage on the crane
24. Who must determine maximum speed for a mobile crane to travel with a suspended
load? - ANSWERS-The competent person
25. When traveling with a suspended load on a mobile crane climbing an incline, the load
should be carried in which direction? - ANSWERS-Uphill
26. Which mobile crane boom configuration can cause the most hazardous side-loading
condition for the crane? - ANSWERS-Long boom with minimum radius
27. When preparing to hoist a load, the load block hook should be positioned: -
ANSWERS-Directly above the load's center of gravity
Certification of Crane Operators | Academic Year 2026/2027 |
Comprehensive Certification Examination | Verified Questions and
Correct Answer Rationales
1. On a mobile cranes range diagram, boom length and boom angle can be used to
determine? - ANSWERS-Load radius
2. On a mobile crane, what is the weight of the slowed jib that is deducted in load chart
calculations called? - ANSWERS-Effective weight
3. When determining boom tip elevation for a mobile crane, the user could: use the
range diagram - ANSWERS-use the range diagram
4. When lifting off the main boom, how is the effective weight of the flyjib different in the
erected position from that of the stowed position? - ANSWERS-Effective weight
increasses
5. Why do most crane manufacturers reduce load capacity for duty-cycle operations? -
ANSWERS-Side loading forces may occur
6. What is the difference between anti-two-block warning device and an anti-two-block
prevention device? - ANSWERS-Warning device only warns, but prevention devices
will stop the functions
7. How can the LMI's boom length or load radius reading be verified? - ANSWERS-Actual
measurements
8. On mobile cranes, what does the boom angle indicator show the operator? -
ANSWERS-Angle of boom to horizontal
9. What is the device called that automatically stops the boom when it nears the cranes
maximum angle? - ANSWERS-Boom hoist limiting
10. When the number of layers of wire rope on a drum increases the: - ANSWERS-
Allowable line pull decreases
11. On a mobile crane, side loading of the boom could be caused by which of the
following? - ANSWERS-Starting or stopping the swing too rapidly
12. Which person listed below, has the responsibility for determining the correct weight
of a load? - ANSWERS-Lift Director
13. What must an operator do when an operator leaves the controls of the crane from an
extended period of time? - ANSWERS-Apply all brakes and dogs, and lower the load
to the ground
, 14. When should a tag line be used, during the hoisting of material? - ANSWERS-When
the rotation of the load would be dangerous
15. What percentage of the rated capacity of a mobile crane must be used when lifting
with two cranes attached to the same load? - ANSWERS-75%
16. When lifting a load with two mobile cranes, it is very important to: - ANSWERS-Keep
the hoist lines of both cranes vertical
17. If lifting a load with two mobile cranes of different rated capacities, the crane with the
larger rated capacity should: - ANSWERS-Be hooked at a distance closer to the loads
center of gravity
18. When performing a multiple crane lift is is important for the operator's of each crane
to understand that: - ANSWERS-The weight may increase if the other crane lands the
load
19. When lifting loads that are submerged under water with a mobile crane, what is one
of the conditions that the operator should be familiar with? - ANSWERS-Load will
increase when lifting the load out of the water
20. When lifting over water with a personnel platform, what are the occupants of the
platform required to wear? - ANSWERS-A floatation device
21. What is the minimum pitch diameter used for sheaves in a boom hoist reeving system
using rotation resistant wire rope? - ANSWERS-Not less than 18 times rope diameter
22. When can capacity altering modifications be made to mobile cranes? - ANSWERS-
When permission is given by the crane manufacturer
23. A crane is at the point of instability when the crane's leverage on the load equals: -
ANSWERS-100% of the load's leverage on the crane
24. Who must determine maximum speed for a mobile crane to travel with a suspended
load? - ANSWERS-The competent person
25. When traveling with a suspended load on a mobile crane climbing an incline, the load
should be carried in which direction? - ANSWERS-Uphill
26. Which mobile crane boom configuration can cause the most hazardous side-loading
condition for the crane? - ANSWERS-Long boom with minimum radius
27. When preparing to hoist a load, the load block hook should be positioned: -
ANSWERS-Directly above the load's center of gravity
