NCCCO CORE T EST QUESTIONS

NCCCO CORE T EST QUESTIONS

ALL ANSWERED

Before leveling a mobile crane on outriggers, an operator should ensure: - ANSWER- there is no weight of the crane bearing on any tires

Operating a mobile crane with a long boom, on uneven ground, what support condition should be considered? - ANSWER- Keeping 90 degree angle between cylinder rod and pad

What is the primary purpose fir a rooster sheave or auxiliary boom point sheave? - ANSWER- Separate the boom hoist lines

How many randomly broken wires in a lay length must there be on a mobile cranes hoist line, before it should be removed from service? - ANSWER- 6

On a mobile crane, how many broken wires are permitted at the end connection of a pendent before it must be taken out of service? - ANSWER- 1

Type 1 rotation resistant hoist wire rope has a design factor of: - ANSWER- 5 to 1

How many randomly distributed broken wires in rotation- resistant hoist wire rope are considered for replacement? - ANSWER- 2 broken wires in 6 rope diameters

The term net capacity is best defined by which of the terms listed below? - ANSWER- Gross capacity minus capacity deductions

Mobile cranes that are set up on barges, shall have a list chart provided by which of the entities listed below? - ANSWER- Manufacturer

When lifting loads on tires, mobile cranes are rated at what percentage of tipping? -

ANSWER- 75%

How does the effective weight of a slowed extension relate to the actual weight of the extension? - ANSWER- Higher than the actual weight.

When load radius is between radii values, the operator must use the: - ANSWER-

longer radius

Why should only approved attachments or extra counterweights provided by the manufacturer be placed on the rear of the crane? - ANSWER- They could cause a backward stability problem.

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A mobile crane's jib is offset 15º versus its original 0º offset, but the boom angle remains

unchanged. In this situation, the load radius: - ANSWER- increases

Abruptly stopping a rapid swing on a long-boom mobile crane will produce what major effect? - ANSWER- Collapsing the boom.

When determining the position to a mobile crane should be left in over night, when high

winds in the forecast the operator should: - ANSWER- Follow the manufacturers

recommendations.

If a mobile crane is NOT set-up level and the operator swings the load from the high side to the low side, what effect will that have on the radius? - ANSWER- The radius increase.

Increasing the distance from the crane's center of gravity to the tipping axis will have what effect on the mobile crane? - ANSWER- Decreases stability.

Backward stability of a mobile crane is tested in which configuration listed below? - ANSWER- Basic boom at minimum angle with no load

Deflection of the boom while operating a mobile crane will increase? - ANSWER- Load Radius (Swings out)

A sudden start or stop of the hoisting function while operating a mobile crane can

produce a: - ANSWER- dynamic load

Before lifting an occupied personnel platform on a job site, which of the following applies? - ANSWER- Use 50% of rated capacity, Trial lift to anticipated weight, Ensure rigging dedicated to platform only.

According to OSHA 1926. 1431, while hoisting a personnel platform, what weather condition listed below will promptly discontinue the operation? - ANSWER- Dangerous

If working near overhead power line and using a tag line, which type of rope is least conductive to electricity? - ANSWER- Polypropylene

When working near power lines with the mobile crane, where does OSHA require caution stickers be installed on all equipment? - ANSWER- At operators station and 2 on the outside of the equipment.

According to OSHA table T, what is the minimum clearance for 133kV power lines? - ANSWER- 10ft

According to OSHA's table T, what clearance should a mobile crane IN TRANSIT keep while going under 445kV lines? - ANSWER- 16ft

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