NCCCO - National Commission for the Certification of Crane Operators Mobile Crane Operator Test 1

Question 1

When setting up a mobile crane on outriggers, what must the operator verify before beginning any lift?

Accepted Answer

The outrigger floats are fully extended and bearing on ground of adequate capacity, with the crane level within manufacturer tolerances

Answer

The outrigger pads are centered under the crane body, not the outrigger floats

Answer

The outrigger cylinders are extended to their maximum stroke regardless of ground conditions

Answer

All outriggers are set to equal height using a tape measure

Question 2

A mobile crane's load chart lists capacities based on different boom lengths and radii. What is the 'radius' as used in crane load charts?

Accepted Answer

The horizontal distance from the center of rotation to the center of the load

Answer

The length of the boom from the boom foot pin to the boom tip sheave

Answer

The vertical height from the ground to the hook at maximum lift

Answer

The distance from the front of the carrier to the load

Question 3

What action should a mobile crane operator take if a load starts to swing uncontrollably during a pick?

Accepted Answer

Lower the load as smoothly and quickly as possible to a safe location

Answer

Increase hoist speed to get the load above the swing arc

Answer

Rotate the upper works in the opposite direction to cancel the swing

Answer

Extend the boom to increase the radius and slow the load

Question 4

Under OSHA 1926 Subpart CC, who is responsible for ensuring that the weight of the load to be lifted is known before the lift begins?

Accepted Answer

The employer, though the operator may also refuse the lift if the weight is unknown

Answer

The signal person, who must weigh the load before any communication begins

Answer

The rigger, who must stamp the load weight on the rigging hardware

Answer

The crane manufacturer's representative on site

Question 5

What does 'structural competency' of a mobile crane refer to?

Accepted Answer

The crane's ability to handle a load without any component failing due to stress

Answer

The operator's formal education credentials as verified by NCCCO

Answer

The rated capacity after deducting the weight of all rigging hardware

Answer

The travel speed rating of the carrier on public roads

Question 6

When is a crane operator required to halt operations and consult with a competent person before continuing?

Accepted Answer

When the operator encounters site conditions not addressed by the manufacturer's specifications or the pre-lift plan

Answer

Any time the wind speed exceeds 5 mph at the job site

Answer

Only when the load exceeds 75% of the rated capacity at the given radius

Answer

Whenever a new signal person takes over mid-shift