NCCCO Tower Crane Operator Test 1 5

Question 1

Which condition requires an immediate shutdown of a tower crane and notification of the competent person?

Accepted Answer

Discovery of a broken wire rope strand exceeding ASME B30.3 removal-from-service criteria

Answer

ASME B30.3 specifies broken wire criteria that, when met, require immediate removal from service until the rope is replaced.

Question 2

What is the maximum allowable slope for a tower crane base when the manufacturer's specification states the crane must be level?

Accepted Answer

The manufacturer's tolerance, typically within 1/500 (0.2%) of plumb

Answer

Tower cranes must be installed to the manufacturer's plumb tolerance, which is typically within 1/500 of the mast height.

Question 3

When performing a pick-and-carry operation with a tower crane, what is the most critical consideration?

Accepted Answer

Tower cranes are not designed for travel with a suspended load and must never pick-and-carry

Answer

Tower cranes are stationary structures and are never designed for pick-and-carry operations; they must remain fixed during all lifts.

Question 4

A qualified rigger attaches a load using a single-leg wire rope sling at a 45-degree angle from vertical. How does this affect the sling's capacity compared to a vertical hitch?

Accepted Answer

Capacity is reduced because the sling experiences a higher tension than the load weight

Answer

At 45 degrees from vertical, the sling tension exceeds the load weight by approximately 41%, reducing its effective working load limit.

Question 5

Under OSHA 29 CFR 1926.1431, what is the maximum number of workers permitted to be hoisted in a personnel platform (man basket) on a tower crane?

Accepted Answer

The number specified by the platform manufacturer not to exceed the platform's rated capacity

Answer

OSHA requires that occupancy not exceed the platform's rated capacity as specified by the manufacturer.

NCCCO (National Commission for the Certification of Crane Operators) Practice Test

NCCCO (National Commission for the Certification of Crane Operators) Practice Test

NCCCO Tower Crane Operator Test 1 5