NCCCO Rigger 1 Study Questions and

NCCCO Rigger 1 Study Questions and Answers with complete solution

• A wire rope that is a 6x19 classification could have how many wires per strand?

Answer- 15 through 26 wires per strand

• How often should a synthetic web sling be inspected? Answer- Each day before use
• Which considerations should be given to suspend lifting operations with a mobile

crane? Answer- Winds in excess of 35 mph

• What is the term that best describes surface wear on a wire rope sling to rubbing or

sliding? Answer- Abrasion

• Which of the following defects discovered during an inspection would cause for

removing a wire rope sling from service? Answer- Ten broken wires in one lay

• According to OSHA, each day before being used, all rigging hardware and slings

shall be inspected for damage or defects by a? Answer- Competent person

• When the hoist line is not vertical what type of dynamic force is being introduced to

the crane? Answer- Side pull

• What is the term used to describe the ultimate or maximum load that a sling fails at ?

Answer- Breaking strength

• A non-shouldered eyebolt is primarily designed for lifting in which plane ? Answer-

Vertical

• According to ASME B30.9, (Slings) what is the maximum width of an object that can

be placed in the eye of a wire rope sling? Answer- 1/2 the length

• What is the term used to describe a sudden or unplanned loading of the crane when

raising or lowering a load that will increase the stress on rigging and the load? Answer- Shock loading

• What formula is used to determine the sling length when you only know the hook

height and the distance from the center of gravity to the pick point? Answer- A2+B2=C2 look at paper

• What is the approximate weight of one cubic foot of steel ? Answer- 480 pounds

(lbs) 1 / 2

• Which type of sling is required to have permanent affixed identification tag stating

size, grade, rated capacity for hitch type that can be used? Answer- Alloy steel chain sling

• Where would you measure to check the diameter of wire rope? Answer- Across the

crowns

• How is the working load limit of slings determined? Answer- Divide the breaking

strength by the design factor

• What is the formula used to find volume of a rectangle? Answer- Length x height x

width

• The tag on a synthetic web sling shall have what required information on it ?

Answer- Name of manufacturer Rated load for each hitch type and type of material

• One leg of a four leg alloy steel chain sling is longer than the other three; this is

possible indication of what type of damage ? Answer- The leg has been over loaded

• Using a cheater pipe on a chain hoist come along what will it give you ? Answer-

More leverage

• What type of hitches provides maximum contact between the sling and the load?

Answer- Double wrap choker/ double wrap basket

• According to 29CFR1910.184, polypropylene web slings shall not be used at

temperatures in excess of ? Answer- 200 degrees

• According to 29CFR1910.184 which type of sling requires annual inspections, with

records retained, and be performed by a competent person designated by the employer? Answer- Alloy steel chain

• What is the term used to describe the distance that it takes one strand to wrap 360

degrees around the core ? Answer- One lay

• What piece of rigging hardware should be used to prevent the wearing in the eye of

a wire rope sling ? Answer- Thimble

• What action should be taken if damaged rigging or rigging hardware is found ?

Answer- Remove from service immediately and inform supervisor

• Which type of wire rope construction has both the wires in the strand and the

strands in the rope laid right-handed in the right hand direction ? Answer- Right-lay, lang-lay

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