Mobile Crane Operator Fundamentals Flashcards

What does the term 'rated capacity' mean for a mobile crane?

Answer: The maximum load the crane is designed to handle under specified conditions

Rated capacity is the maximum load a crane is approved to lift under specific conditions defined by the manufacturer, including boom angle, radius, and configuration.

Which of the following must be done before operating a mobile crane on a new job site?

Answer: Review the load chart and assess ground conditions for stability

Before operating a crane on any job site, the operator must review the load chart and assess ground conditions to ensure the crane can be set up safely and the planned lifts are within capacity.

What is the primary purpose of a crane's counterweight?

Answer: To offset the load moment and improve crane stability

Counterweights are positioned on the crane's superstructure to counterbalance the load moment, improving stability and increasing the crane's lifting capacity.

When a mobile crane is traveling on a public road, the boom should typically be:

Answer: Positioned over the front of the carrier in the direction of travel

When traveling on public roads, the boom is typically positioned over the front of the carrier in the direction of travel to reduce overall height and maintain stability during transport.

What does 'tipping capacity' mean in crane operations?

Answer: The load at which the crane begins to tip over

Tipping capacity is the load at which the crane would begin to tip over; rated capacity is typically a percentage of tipping capacity to maintain a safety margin.

Which document provides the most authoritative information about a crane's lifting capacities for a given configuration?

Answer: The crane manufacturer's load chart for that crane model

The crane manufacturer's load chart is the most authoritative source for lifting capacities, as it is specific to that crane model and configuration.