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CERTIFICATION PROGRAMS

Mobile Crane Operator

Written Exam - Lattice Boom Crawler Crane (LBC) 

American

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 Side Frames Extended Extension N/A
Counterweight 58,100-lb. Ext. Off-set / Angle N/A
Main Boom 110-ft. Block N/A
Main Boom Angle N/A Ball 700-lb., 1-part of line
Radius 45-ft. Rigging 500-lb.
Other N/A Main Rope 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 off the main boom?

A. 21,540 lbs.

Correct,
Gross Capacity
22,740
Ball
700
Rigging
500
Total Deducts
1,200
Net Capacity
21,540

B. 23,450 lbs.

Incorrect, Wrong gross capacity due to line pull

C. 22.740 lbs.

Incorrect, Line pull capacity

D. 22,040 lbs.

Incorrect, Forgot rigging

Sample Item #2

Configuration Side Frames Extended Extension 50-ft. Jib
Counterweight 58,100-lb. Ext. Off-set / Angle 15-degree offset
Main Boom 170-ft. Block N/A
Main Boom Angle 72-degrees Ball 450-lb.
Radius N/A Rigging 320-lb.
Other N/A Main Rope N/A
Other N/A Aux. Rope 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. 7,600 lbs.

Incorrect, Gross capacity

B. 7,380 lbs.

Incorrect, Used higher boom angle at 73.1 degrees

C. 5,100 lbs.

Incorrect, Used 25 degree offset

D. 6,830 lbs.

Correct,
Gross Capacity
7,600
Ball
450
Rigging
320
Total Deducts
770
Net Capacity
6,830

Sample Item #3

Configuration Side Frames Extended Extension N/A
Counterweight 58,100-lb. Ext. Off-set / Angle N/A
Main Boom 130-ft. Block 1,200-lb., 2-parts of line
Main Boom Angle N/A Ball N/A
Radius 65-ft. Rigging 450-lb.
Other N/A Main Rope 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 off the main boom?

A. 14,000 lbs.

Incorrect, No rope deductions

B. 13,764 lbs.

Correct,
Gross Capacity
15,650
Block
1,200
RIgging
450
Main Rope
236
Total Deducts
1,886
Net Capacity
13,764

C. 17,344 lbs.

Incorrect, Used higher boom angle at 64.7 degrees

D. 15,650 lbs.

Incorrect, Gross capacity