NCCCO Mobile Crane Operator Test 1 3

Question 1

When operating a mobile crane near an unguarded energized power line of unknown voltage, the minimum safe approach distance is:

Accepted Answer

20 feet

Answer

OSHA 1926.1408 requires a minimum 20-foot clearance from energized lines when voltage is unknown.

Question 2

A load chart rating for a mobile crane is based on which structural condition of the crane?

Accepted Answer

Crane on level, firm ground with all outriggers fully extended

Answer

Load charts assume the crane is on firm, level ground with all outriggers fully extended and set on pads.

Question 3

Which of the following conditions requires an operator to immediately cease crane operations?

Accepted Answer

The load line becomes slightly slack during a pick

Answer

A slack load line can cause sudden uncontrolled load movement or two-blocking, requiring immediate stoppage.

Question 4

What is the purpose of a load moment indicator (LMI) on a mobile crane?

Accepted Answer

To alert the operator when the crane approaches its rated capacity

Answer

An LMI (also called a rated capacity indicator) warns the operator as the crane nears its load limit for the current configuration.

Question 5

During a lift, the operator notices the load is slowly swinging uncontrollably. The FIRST action should be to:

Accepted Answer

Lower the load to the ground as smoothly as possible

Answer

An uncontrolled swinging load should be landed as safely and smoothly as possible to eliminate the hazard.

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