NCCCO Final Test Flashcards

Questions and Answers

Which area do truck cranes without a 5th outrigger generally have no lifting capacity unless the manufacturer states otherwise?

The side

The front (correct)

The top

The rear

What is the definition of 'operating radius'?

The distance from the center of rotation of the crane to the center of gravity of the load

What applies to the capacities below the bold line shown on a load chart?

They are based on the stability of the crane (correct)

They are based on the weight of the load

They are based on the height of the lift

They are based on the speed of the operation

In which quadrant are rough terrain crane capacities generally greater?

Over the front Signup and view all the answers

What percentage do most manufacturers require a crane's load chart capacity to be reduced by for duty cycle operations?

20% Signup and view all the answers

From which two points should the boom be measured?

From the boom hinge pins to the center of the boom tip sheave Signup and view all the answers

What is the preferred method of installing wire rope from a reel onto a hoist drum?

Running the rope from the top of the reel to the top of the drum Signup and view all the answers

Over which quadrant are truck crane capacities usually greater?

Over the rear Signup and view all the answers

According to OSHA, which accessible area of an operating crane must always be barricaded?

The swing radius of the rear of the rotating superstructure Signup and view all the answers

What is the OSHA regulation governing cranes in construction?

1926.1400 Signup and view all the answers

According to ASME, what percentage of the manufacturer's crane rating must not be exceeded if a load test is done on a repaired crane?

100% Signup and view all the answers

Where is the tipping axis of a crawler crane located?

It depends if the idler or sprocket are in line or offset from the track rollers Signup and view all the answers

What should be done with materials placed under overhead energized power lines?

Not be lifted by crane Signup and view all the answers

What determines the amount of deduction required for an erected jib that is not being used?

The effective weight of the jib Signup and view all the answers

What happens to ground bearing pressure if you move a crawler crane from soft ground to harder ground?

It increases Signup and view all the answers

How should the wheels of a crane be positioned when it is set up for working on outriggers?

Just high enough off the ground to relieve the tires of crane weight Signup and view all the answers

Where are the Standard Method hand signals found?

OSHA Subpart CC Signup and view all the answers

A truck crane is set up on outriggers. The part of the load chart governed by stability is based on what percentage of the crane's capacity?

85% Signup and view all the answers

Truck crane capacities are usually greater over the _________

rear Signup and view all the answers

If the operator makes two audible signals when moving a crane, he/she intends to ______________

go ahead Signup and view all the answers

Blocking (cribbing) may be placed under outrigger beams.

False Signup and view all the answers

Timber blocking placed under the tips of the tracks on a crawler crane will:

Make the crane more stable Signup and view all the answers

What is the primary purpose of placing blocking under the ends of the tracks on a crawler crane?

To ensure that the tipping axis is the sprocket or idler, rather than a track roller Signup and view all the answers

Suppose you are traveling a crawler crane with the drive trains to the rear, and you need to turn right on hard, level ground. What should you do?

Travel the left track forward to minimize wear Signup and view all the answers

When using outrigger jacks to level a crane, what is the best procedure to follow?

Make firm contact with all four jacks. Then operate two jacks at a time on either side of the lowest corner to get to level. Last, make sure the crane is high enough to have the tires off the ground. Signup and view all the answers

How does the use of outriggers increase the tipping capacity of a crane?

By moving the tipping axis further from the center of gravity of the crane Signup and view all the answers

Many load charts for cranes state that the area of least stability is over the side. What statement explains this the best?

The distance between the crane's center of gravity and the tipping axis is smallest in that quadrant Signup and view all the answers

Study Notes

Truck Crane Operations

Truck cranes without a 5th outrigger typically have no lifting capacity in the front area unless specified by the manufacturer.
Operating radius is defined as the distance from the crane's center of rotation to the load's center of gravity.

Load Chart Capacities

Capacities below the bold line on a load chart reflect the stability of the crane.
Rough terrain cranes generally have greater lifting capacities over the front quadrant.

Duty Cycle Operations

Manufacturers typically require a 20% reduction in crane load chart capacity for duty cycle operations, such as high-volume concrete placements.

Boom Measurements

Boom measurements are made from the boom hinge pins to the center of the boom tip sheave.
Preferred installation method for wire rope involves running the rope from the top of the reel to the top of the hoist drum.

Safety Regulations

According to OSHA, the swing radius at the rear of a rotating superstructure must always be barricaded.
OSHA regulation 1926.1400 governs crane operations in construction sites.

Crane Testing and Ratings

ASME specifies that a repaired crane should not exceed 100% of the manufacturer's rated load during tests.
The tipping axis of a crawler crane depends on whether the idler or sprocket is in line or offset from the track rollers.

Safety Precautions

Materials near energized power lines should not be lifted with cranes.
The deduction for an unused jib is based on its effective weight.

Ground Conditions

Ground bearing pressure increases when a crawler crane is moved from soft to harder ground.
When setting up a crane on outriggers, its wheels should be elevated just enough to relieve weight from the tires.

Load Chart and Stability

Stability governs 85% of the load chart capacity for a truck crane set on outriggers.
Truck crane capacities are typically greater over the rear quadrant.

Communication Signals

Two audible signals from the operator indicate the intention to proceed with the operation.

Outrigger and Stability

Blocking or cribbing under outrigger beams is not permitted.
Timber blocks under crawler crane track tips enhance stability and ensure the tipping axis is aligned with the sprocket or idler.

Crawler Crane Maneuvering

When maneuvering a crawler crane with rear drive trains, traveling the left track forward minimizes wear.
The best leveling procedure with outrigger jacks involves making firm contact with all jacks and adjusting two at a time on either side of the lowest corner.

Tipping Capacity

Outriggers enhance tipping capacity by moving the tipping axis away from the crane's center of gravity.
The area of least stability for many cranes is over the side, as the distance between the center of gravity and the tipping axis is smallest there.

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Description

Prepare for the NCCCO certification with these flashcards covering essential crane operation concepts. Test your knowledge on lifting capacities, operating radius, and load charts to ensure you are well-prepared for your final exam.