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CERTIFICATION PROGRAMS

Mobile Crane Operator

Written Exam - Lattice Boom Truck Crane (LBT) 

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These sample questions are intended to convey something of the style and content of the National Operator Certification Program examination developed and administered by the National Commission for the Certification of Crane Operators (NCCCO). They are not actual test questions, nor do they attempt to address all of the areas of knowledge tested on the CCO certification examination. Response to these questions is not necessarily an indication of performance on the CCO examinations.

(Note: N/A means Not Applicable)

Sample Item #1

Configuration On Outriggers Extension N/A
Counterweight AB+A Ext. Off-set / Angle N/A
Main Boom 160-ft. Block N/A
Main Boom Angle 40-degrees Ball 750-lb
Radius N/A Rigging 180-lb.
Other N/A Main Rope Type RB, 2-lb./ft.
Other N/A Aux. Rope N/A

Note: For line in use, when wire rope deductions are required, the wire rope length shall be measured from the boom tip to the ground.

What is the net capacity for 360 degree rotation?

A.   8,770 lbs.

Correct,
Gross Capacity
9,700
Ball
750
Rigging
180
Total Deducts
930
Net Capacity
8,770

B.   12,670 lbs.

Incorrect, Used over the rear chart

C.   7,770 lbs.

Incorrect, Used AB+0 counterweight chart

D.   10,370 lbs.

Incorrect, Wrong boom angle = 43 degrees

Sample Item #2

Configuration On Tires Extension N/A
Counterweight AB+A Ext. Off-set / Angle N/A
Main Boom 110-ft. Block 2,600-lb., 4-parts of line
Main Boom Angle 71-degrees Ball N/A
Radius N/A Rigging 300-lb.
Other N/A Main Rope Type N, 2-lb./ft.
Other N/A Aux. Rope N/A

Note: For line in use, when wire rope deductions are required, the wire rope length shall be measured from the boom tip to the ground

What is the net capacity when lifting from the main boom over the rear?

A.   32,700 lbs.

Incorrect, No rope deducts

B.   24,160 lbs.

Incorrect, Used AB+0 counterweight chart

C.   32,260 lbs.

Correct,
Gross Capacity
35,600
Block
2,600
Rigging
300
Main Rope
440
Total Deducts
3,340
Net Capacity
32,260

D.   32,480 lbs.

Incorrect, Used 1 part excess rope

Sample Item #3

Configuration On Outriggers Extension 60-ft. jib
Counterweight ABC+A Ext. Off-set / Angle 15-degrees
Main Boom 190-ft. Block 2,600-lb., 4-parts of line, 15-ft. below tip
Main Boom Angle N/A Ball 750-lb., 1-part of line
Radius 90-ft. Rigging 200-lb.
Other N/A Main Rope Type N, 2-lb./ft.
Other N/A Aux. Rope Type RB, 2-lb./ft.

Note: For line in use, when wire rope deductions are required, the wire rope length shall be measured from the boom tip to the ground

What is the net capacity when lifting off the jib?

A.   11,430 lbs.

Incorrect, No deduct for rigging

B.   11,350 lbs.

Incorrect, No deduct for main rope

C.   9,730 lbs.

Incorrect, Used 100 ft. radius

D.   11,230 lbs.

Correct,
Gross Capacity
14,900
Block
2,600
Jib
750
Rigging
200
Main Rope
120
Total Deducts
3,670
Net Capacity
11,230