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CERTIFICATION PROGRAMS

Mobile Crane Operator

Written Exam - Lattice Boom Truck Crane (LBT) 

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 On Fully Extended Outriggers Extension 40-ft. jib
Counterweight 95,400-lb. + 25,000-lb. Ext. Off-set / Angle 5-degrees
Main Boom 140-ft. Block 5,000-lb., 4-parts of line
Main Boom Angle 60.3-degrees Ball 500-lb., 1-part of line, 15-ft. below tip
Radius N/A Rigging 1,000-lb.
Other Boom Butt Mounted Auxiliary Drum 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 boom/jib point-elevation column listed on the boom/jib capacity chart. Round boom/jib point elevation to the nearest whole number.

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

A. 39,100 lbs.

Incorrect, No excess rope deduct

B. 38,030 lbs.

Correct, 
Gross Capacity
52,000
Jib
4,700
Block
5,000
Ball
500
Rigging
1,000
Main Rope
1,040
Aux Rope
30
Aux Drum
1,700
Total Deducts
13,970
Net Capacity
38,030

C. 31,230 lbs.

Incorrect, Used 78,400 lb. + 25,000 lb. counterweight

D. 42,730 lbs.

Incorrect, No jib deduct

Sample Item #2

Configuration On Fully Extended Outriggers Extension 30-ft. jib
Counterweight 95,400-lb. + 25,000-lb. Ext. Off-set / Angle 25-degrees
Main Boom 100-ft. Block 2,650-lb., 4-parts of line, 10-ft below tip
Main Boom Angle N/A Ball 500-lb., 1-part of line
Radius 105-ft. Rigging 375-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 boom/jib point-elevation column listed on the boom/jib capacity chart. Round boom/jib point elevation to the nearest whole number.

What is the net capacity when lifting off the jib over the rear?

A. 26,029 lbs.

Incorrect, Used 5 degree offset chart

B. 25,375 lbs.

Incorrect, No main or aux rope deducts

C. 25,129 lbs.

Correct,
Gross Capacity
28,900
Block
2,650
Ball
500
Rigging
375
Main Rope
80
Aux Rope
166
Total Deducs
3,771
Net Capacity
25,129

D. 21,229 lbs.

Incorrect, Deducted jib

Sample Item #3

Configuration On Fully Extended Outriggers Extension 40-ft. jib
Counterweight 95,400-lb. + 25,000-lb. Ext. Off-set / Angle 15-degrees
Main Boom 140-ft. Block 5,000-lb., 4-parts of line
Main Boom Angle 68.5-degrees Ball 500-lb., 15-ft. below tip
Radius N/A Rigging 800-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 boom/jib point-elevation column listed on the boom/jib capacity chart. Round boom/jib point elevation to the nearest whole number.

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

A. 73,200 lbs.

Incorrect, Gross capacity

B. 66,304 lbs.

Incorrect, No deducts for jib, ball, or aux rope

C. 60,374 lbs.

Incorrect, Used 360 degree chart

D. 61,074 lbs.

Correct,
Gross Capacity
73,200
Jib
4,700
Block
5,000
Ball
500
Rigging
800
Main Rope
1,096
Aux Rope
30
Total Deducts
12,126
Net Capacity
61,074