Service Truck Crane Operator Test 1 Flashcards

When reading a service truck crane load chart, what does the 'working radius' refer to?

Answer: The horizontal distance from the crane's rotation axis to the center of the load

Working radius is the horizontal distance from the axis of crane rotation to the center of the suspended load.

Which condition requires an operator to immediately stop crane operations?

Answer: A nearby worker enters the swing radius

Operations must stop immediately when any person enters the crane's swing radius to prevent crush injuries.

What is the purpose of a anti-two-block device on a service truck crane?

Answer: To prevent the load block from being raised into the boom tip

An anti-two-block device automatically stops hoist travel to prevent the load block from colliding with the boom tip sheaves.

When setting outrigger pads on soft or unstable ground, the operator should:

Answer: Use cribbing or mats to distribute the load over a larger area

Cribbing or crane mats spread the outrigger load over a larger area to prevent sinking or tipping on soft ground.

According to ASME B30.22, what is the minimum number of wraps of wire rope that must remain on the hoist drum during operation?

Answer: 2 wraps

ASME B30.22 requires at least two wraps of wire rope on the hoist drum at maximum extension to maintain rope retention.

A load chart lists a capacity of 4,000 lbs at a 10-foot radius. The operator wants to lift at a 15-foot radius. What should the operator do?

Answer: Refer to the load chart value for the 15-foot radius before lifting

Capacity decreases as radius increases, so the operator must always read the load chart at the actual working radius.

What does a yellow tag on a sling indicate?

Answer: The sling requires inspection before next use

A yellow tag on rigging equipment signals that it requires reinspection before being returned to service.