NCCCO Crane Type Identification and Applications 4

Question 1

A stiff-leg derrick differs from a guy derrick primarily because it:

Accepted Answer

Uses rigid inclined legs instead of guy wires for mast support

Answer

A stiff-leg derrick uses two rigid inclined legs (stiff legs) to support the mast rather than flexible guy wires, providing a stable, fixed-position lifting platform.

Question 2

Which crane type is most appropriate for indoor use in a facility where overhead clearance is severely limited?

Accepted Answer

Low-headroom hoist with underhung trolley

Answer

Low-headroom hoists with underhung trolleys are specifically engineered to minimize the vertical space required between the hook and the overhead beam.

Question 3

A climbing tower crane is designed to:

Accepted Answer

Raise itself as a building's floors are constructed

Answer

Climbing tower cranes use a hydraulic climbing frame to jump upward as new building floors are completed, keeping the crane at an optimal working height.

Question 4

Which crane type would be LEAST suitable for operation in a petrochemical plant with explosion hazard zones?

Accepted Answer

Standard AC electric overhead crane without explosion-proof classification

Answer

Standard electric cranes without explosion-proof ratings can produce sparks that ignite flammable atmospheres; only ATEX/explosion-proof rated equipment is permitted in hazardous zones.

Question 5

What operational characteristic defines a 'hammerhead' tower crane?

Accepted Answer

A horizontal jib fixed at a constant angle with a trolley that travels along it

Answer

A hammerhead (flat-top or horizontal jib) tower crane has a fixed horizontal jib with a load trolley that travels in and out along its length to position the load.

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

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

NCCCO Crane Type Identification and Applications 4