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CERTIFICATION PROGRAMS

Mobile Crane Operator

Written Exam - Lattice Boom Crawler Crane (LBC) 

Manitowoc

These sample questions are intended to convey something of the style and content of the Crane Operator Certification Program written examinations 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 examinations. 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 Crawlers Extended Extension 30-ft. jib
Counterweight 179,100-lb. + 44,000-lb. Ext. Off-set / Angle 5-degrees
Main Boom 260-ft. Block N/A
Main Boom Angle 65-degrees Ball 500-lb., 1-part of line
Radius 130-ft. Rigging 150-lb.
Other 1,545-lb. Lifting Beam Main Rope N/A
Other N/A Aux. Rope 2-lb./ft.

Note: For line in use, deductions for wire rope length beneath boom/jib point shall be based on the boom/jib point-elevation column listed on the boom/jib capacity chart. Boom/jib point elevation shall be rounded to nearest whole number.

What is the net capacity when lifting off the jib?

A.   21,665 lbs.

Incorrect, No ball deduct

B.   21,705 lbs.

Incorrect, No rope deduct

C.   21,165 lbs.

Correct,
Gross Capacity
23,900
Ball
500
Rigging
150
Aux Rope
540
Lifting Beam
1,545
Total Deducts
2,735
Net Capacity
21,165

D.   22,205 lbs.

Incorrect, No rope or ball deduct

Sample Item #2

Configuration Crawlers Extended Extension 30-ft. jib
Counterweight 179,100-lb. + 44,000-lb. Ext. Off-set / Angle 5-degrees
Main Boom 190-ft. Block 1,200-lb., 2-parts of line
Main Boom Angle 69.1-degrees Ball N/A
Radius N/A Rigging 150-lb.
Other N/A Main Rope 2-lb./ft.
Other N/A Aux. Rope N/A

Note: For line in use, deductions for wire rope length beneath boom/jib point shall be based on the boom/jib point-elevation column listed on the boom/jib capacity chart. Boom/jib point elevation shall be rounded to nearest whole number.

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

A.   62,500 lbs.

Incorrect, Gross capacity without considering 2 part line restriction

B.   54,210 lbs.

Correct,
Gross Capacity
59,000
Jib
2,700
Block
1,200
Rigging
150
Main Rope
740
Total Deducts
4,790
Net Capacity
54,210

C.   57,710 lbs.

Incorrect, Proper deducts, used gross without considering 2 part line restriction

D.   64,402 lbs.

Incorrect, Wrong radius at 70 ft.

Sample Item #3

Configuration Crawlers Extended Extension 30-ft. jib
Counterweight 179,100-lb. + 44,000-lb. Ext. Off-set / Angle 5-degrees
Main Boom 120-ft. Block 2,175-lb., 4-parts of line
Main Boom Angle 58.3-degrees Ball 500-lb., 1-part of line, 10-ft. below tip
Radius N/A Rigging 310-lb.
Other N/A Main Rope 2-lb./ft.
Other N/A Aux. Rope 2-lb./ft.

Note: For line in use, deductions for wire rope length beneath boom/jib point shall be based on the boom/jib point-elevation column listed on the boom/jib capacity chart. Boom/jib point elevation shall be rounded to nearest whole number.

What is the net capacity when lifting off the main boom?

A.   64,323 lbs.

Correct,
Gross Capcity
70,900
Jib
2,700
Block
2,175
Ball
500
Rigging
310
Main Rope
872
Aux Rope
20
Total Deducts
6,577
Net Capacity
64,323

B.   64,843 lbs.

Incorrect, No ball deduct or aux rope deduct

C.   57,647 lbs.

Incorrect, Wrong gross

D.   67,023 lbs.

Incorrect, No jib deduction