NCCCO Mobile Crane Operator Test 3

Question 1

Under which circumstance is a crack in the windshield of a crane cab okay?

Accepted Answer

As long as it causes no visible distortion that would interfere with safe operations

Answer

A crack in the windshield of a crane cab is only acceptable if it does not cause any visible distortion that would impede the operator's clear line of sight or interfere with safe operations. Any crack that impairs visibility must be repaired or the windshield replaced immediately to ensure the operator can safely monitor the work area.

Question 2

Unless the manufacturer states otherwise, what crane capacity chart is appropriate when a crane is set up with 3 of its 4 outriggers extended and the fourth is retracted?

Accepted Answer

On-rubber chart

Answer

If a crane is set up with fewer than all outriggers fully extended (e.g., three out of four), its stability is compromised compared to a fully outrigged setup. In such situations, the crane's capacity must be downgraded to the 'on-rubber chart' capacity, as this chart reflects a less stable configuration, unless the manufacturer provides specific charts for partial outrigger extension.

Question 3

According to OSHA, while hoisting personnel, the total load must not exceed what percentage of the crane's rated capacity?

Accepted Answer

Answer

The question is incomplete as the correct answer (percentage) is missing. However, according to OSHA 1926.1431(g)(1)(i)(A), when hoisting personnel, the total load must not exceed 50% of the crane's rated capacity for the radius and configuration.

Question 4

When is side loading of crane booms permitted?

Accepted Answer

Only with freely suspended loads

Answer

Side loading of crane booms is generally prohibited because it introduces bending forces that the boom is not designed to withstand, potentially leading to structural failure. However, it is permissible only with freely suspended loads, as these loads can swing freely and align themselves with the hoist line, thereby minimizing lateral forces on the boom.

Question 5

What is indicated if an operator makes two audible signals when moving a crane?

Accepted Answer

He/she intends to go ahead

Answer

In crane operations, two audible signals are a standard communication method used to indicate that the operator intends to move the crane forward or 'go ahead.' This signal alerts personnel in the vicinity of the crane's impending movement, enhancing safety on the job site.

Uncategorized Practice Test

Uncategorized Practice Test

NCCCO Mobile Crane Operator Test 3