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Crane Class > Crane Class 1 > Flashcards

Crane Class 1 Flashcards

1
Q

Duty cycle

A

Relative operating in a short cycle

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2
Q

Running wire rope

A

Wire rope running over a sheave

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3
Q

Periodic inspection

A

With records kept for at least 3 months

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4
Q

Lay length

A

Horizontal distance of one rotation of a strand on the wire rope

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5
Q

Rope lay

A

Signifies the rotation of wire and strands

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6
Q

Safety factor of regular lay wire rope while hoisting personnel

A

7 to 1

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7
Q

The dead end of a wire rope should never be less than?

A

6 inches

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8
Q

When using rotation resistant wire rope on a becket the tail should never be less than

A

20 diameters of the wire rope

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9
Q

What are the 5 parts that make up a wire rope?

A

Wire
Center wire
Strand
Wire rope core
Wire rope

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10
Q

Which is the number of strands and which is the number of wires per strand?

6x19

A

6 strands 19 wires per strand

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11
Q

Regular lay

A

Wires and strands that fall in opposite directions

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12
Q

Lang lay

A

Wires and strands that fall in the same direction

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13
Q

Rigging wire rope removal criteria

A

10% broken wires in 8 rope diameters

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14
Q

How do you measure wire rope and how many times?

A

Crown to crown

3 times for 6 strand wire rope
4 times for 8 strand wire rope

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15
Q

What is the termination efficiency of a wire rope clip turn back eye?

A

90% 1” and over
80% under 1”

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16
Q

Nylon choker his has ___ capacity of a single leg sling

A

75% the capacity

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17
Q

Double choker hitch has ____ capacity of a bridle at the same sling angle

A

75% capacity

18
Q

What is the D/d ratio of a basket hitch?

A

25/1

19
Q

What is the safety factor of IWRC (Independent Wire Rope Core)

A

7/1 for rotation resistant

10/1 for personnel lifting

20
Q

What is the design factor for wire rope and synthetic slings?

A

5/1

21
Q

What is the design factor for chain slings?

A

4/1

22
Q

What is the formula for determining safe working load SWL of a wire rope sling?

A

Diameter of the sling multiplied by itself then multiplied by 8 or:

d x d x 8 = SWL

23
Q

How do you determine if the ultimate breaking strength UBS of wire core, wire rope?

A

Diameter of the wire rope multiplied by itself, multiplied by 45 or:

d x d x 45 = UBS

24
Q

What is the safety factor of rotation resistant wire rope?

A

5/1

25
Q

Wire core wire rope is ___% stronger than fiber core wire rope

A

7.5%

26
Q

What are the 3 types of shackles?

A

Safety pin

Bolt type

Screw type

27
Q

What does D/d stand for?

A

Diameter to diameter ratio

Big D = diameter of the object the wire rope sling goes around

Little d = diameter of the wire rope sling

28
Q

Sorting hooks (pelican hooks) should be used at what angle and up to what WLL?

A

45 degree angle and a 7.5t WLL

2t WLL when tip loading

29
Q

3 wire rope lubricant criteria

A

Non corrosive

Recommended by manufacturer

Cannot hinder inspection

30
Q

Termination efficiency of a Flemish eye?

A

90%

31
Q

Termination efficiency of a wedge socket

A

80%

32
Q

Termination efficiency of a spelter socket

A

100%

33
Q

Reasons for wire rope removal

A

Electrical contact

Crushing

Birdcaging

Core protrusion and wear

34
Q

Turnback eye formula for number of clips needed

A

3 times the diameter of the wire rope plus one

1” wire rope: 4 clips

1 x 3 + 1 = 4 clips

35
Q

Removal criteria of wire rope sling

A

5 broken wire in one strand in one lay or 10 broken wires in one lay

36
Q

Maximum included angle of a hook

A

90 degrees

37
Q

Maximum included angle of a shackle

A

120 degrees

38
Q

Wear criteria of a hook

A

5% critical areas

5% or 1/4” throat opening

10% other areas

39
Q

What is fleet angle

A

The angle between a line drawn from the tip of the boom to the ground and a line drawn from the boom tip to the outermost flange point

40
Q

Removal criteria of wire rope

A

1/3 of the original dimension

41
Q

Rejection criteria for chain slings

A

10% wear

5% stretch

Weld splatter

Twists

Gouges

Excessive nicks

Kinks

42
Q

Wire rope sling capacities

A

Two legs 200%

Single leg 100%

Single choke 75%

Crane Class (18 decks)

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