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Crane Class > Practice crane test > Flashcards

Practice crane test Flashcards

1
Q

What is the percent of capacity of a triple chain compared to two legs

A

150%

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2
Q

Defined the mechanical advantage of the block to the winch

A

Can multiply pulling power,
safe working load of cable increases equal to the parts added

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3
Q

What are the broken wire removal criteria for rotation resistant wire rope

A

Two random broken wires and six diameters or four randomly broken wires and 30 diameters

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4
Q

What is rope lay length

A

The length of the strand to make one full revolution around the wire rope

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5
Q

Define fleet angle

A

The angle drawn from the boom tip sheave to the ground and other line from the boom tip sheave to the center of the outer most flange of the boom hoist
1.5° smooth 2° grooved

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6
Q

What are the wear criteria for taking wire rope out of service

A

1/3 wear of the original outside dimension

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7
Q

Name four types of cranes

A

Rough terrain
All-terrain
Crawler mounted
Carrier mounted

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8
Q

Give two reasons why one Crane in a two crane pick would intentionally be given more weight

A

One crane has a higher capacity
Offset center of gravity

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9
Q

Give two causes of the majority of crane accidents

A

Wind, erratic swing, improper set up, human error

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10
Q

What type of bolt is used for angular lifts

A

Shoulder eyebolt

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11
Q

The rule of thumb is that all sheaves should have a D/d ratio of

A

20/1

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12
Q

What is overhaul weight

A

The weight needed to pull the line off the drum

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13
Q

What is the efficiency of a Flemish eye

A

90%

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14
Q

What is the termination efficiency of a wedge socket

A

80%

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15
Q

Being off level results in?

A

In accurate radius, invalid load chart, uncontrolled swinging, tipping

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16
Q

Wire rope sling capacities
Single leg___%?
Single choker___%?
Two leg vertical_____%?

A

Single leg 100%
Single choker 75%
To like vertical 200%

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17
Q

What is the minimum D/d ratio for boom hoist sheaves , boom tip sheaves, hoist block sheaves

A

Boom hoist sheaves 15/1
Boom tip sheaves 18/1
Hoist block sheaves16/1

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18
Q

Seven rejection criteria for chain slings

A

Heat damage, 5% stretch links, cuts, bent links, 10% wear, welded links, weld splatter. 4:1 safety factor

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19
Q

What is the allowable throat opening on a hook due to wear of original dimension?

A

5% 1/4”

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20
Q

ANSI B30.5 OSHA1926 sub part cc

A

Safety and health regulations for cranes in derricks in construction

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21
Q

List five things to look for when inspecting wire rope

A

Broken wires, kinks, core Protrusion, corrosion, bird caging, Electrical contact

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22
Q

What are the broken wire removal criteria for wire rope terminations?

A

One broken wire at the end fitting, no more than two broken wires beyond the end fitting

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23
Q

What’s three basic functions of blocks

A

Increase permissible line pull, change of direction, change of speed

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24
Q

What are four causes of bird caging

A

Pulling through tight sheaves, shock loading, sudden stops, rope wound to tight on drum

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25
Q

What is the termination efficiency of a swage socket

A

100%

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26
Q

The D/D ratio of shackle to Flemish I should be

A

One size greater

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27
Q

Define the fleet angle standards for drums

A

1.5° smooth, 2° grooved

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28
Q

What is sideloading

A

When the hoist line or load is not directly under the boom tip

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29
Q

What is gross load

A

The weight of a load plus all deductions

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30
Q

Termination efficiency for a spelter socket

A

100%

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31
Q

What is the formula for the number of clips required to make a wire rope turn back eye

A

Three times the diameter +1

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32
Q

List three factors that determine crane capacity

A

Crane stability, structural competence, Crane configuration, crane deduction

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33
Q

What is the formula that determines tension in a sling

A

Weight of the load divided by number of legs times the L/H factor

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34
Q

List five criteria that determine a critical lift

A

Two crane pick, over 75% of capacity, specialized rigging, personnel lift, working within table A

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35
Q

List five parts of a lattice boom section

A

Pin connections, picture frame, main cord, diagonal, lacing, lattice members

36
Q

What is cabling

A

What are multipart block spends 90° and different parts touch

37
Q

What are two precautions to take when extending the hydraulic boom

A

Extend evenly, cable down to prevent 2 blocking

38
Q

Define load radius

A

Distance from boom center pin to load being lifted

39
Q

List two categories and load chart capacities

A

Structural/stability

40
Q

What is gross capacity

A

The number found in the load chart

41
Q

What are the removal criteria for a rope slings

A

Five broken wires and one strand and one lay, 10 randomly broken wires in one lay 

42
Q

 what is the load applied to test rigging gear

A

125% for five minutes

43
Q

What is effective weight

A

The weight of an object in comparison to its placement on the crane

44
Q

Name five parts of wire rope

A

Core, strand, center wire, wire rope, wire

45
Q

Describe daily inspection

A

Inspection to be done at the beginning of each shift no records needed

46
Q

Describe periodic inspection

A

1 to 12 months intervals, must be recorded by a qualified person

47
Q

What is the unit weight of steel

A

490 pounds per cubic foot

48
Q

Define boom angle

A

The line drawn from the center of the boom to the horizontal

49
Q

The included angle of a hook is

A

90°

50
Q

The operator shall test the brakes each time a load is approaching the rate of a load or is handled by

A

Slightly lift the load off ground, apply brakes and make sure they hold

51
Q

The horizontal lines indicate what are at the range diagram

A

Tip height or elevation

52
Q

Rope must extend at least six times the rope diameter be on the wedge socket and be

A

No less than 6 inches

53
Q

Rotation resistant wire rope must extend____times the diameter four tail on a wedge socket and be_______

A

20
No less than 6 inches

54
Q

What is jib angle to the ground

A

Main boom angle minus jib offset angle

55
Q

Above the bold line on a load chart represents what

A

Strength

56
Q

Unit weight of water is what

A

62 pounds per cubic foot

57
Q

Load chart capacity is based on the following percentages:

A

Outrigger
85%
Rubber
75%
Crawler
75%

58
Q

____ is the maximum load that can be applied to working gear in service

A

SWL WLL

59
Q

What is the best way to reeve a block and why

A

Even parts symmetrically, to avoid tours in loading the boom tip

60
Q

What is wear the criteria for hooks

A

10% wear, 5% wear in critical areas

61
Q

What is ductility

A

The point of material can stress or flex without failure

62
Q

What is a range diagram

A

Shows cranes working range, Boom tip height, radius, boom angle

63
Q

How much more capacity does a four legged sling have versus a three legged sling

A

Zero

64
Q

Double leg basket must not be use that a sling angle less than____°

A

60°

65
Q

3° off level can’t lose as much as ____ capacity

A

50%

66
Q

How many gallons per cubic foot

A

7.48 gallons

67
Q

What is the formula for the volume of a cube

A

Length X width X height

68
Q

What is the formula for the volume of a cylinder

A

Pi X radius squared X length

69
Q

Wire rope core is____% stronger than fiber core

A

7.5%

70
Q

List three types of shackles

A

Pin, screw, bolt

71
Q

Name a type of wire rope that has a tendency to untwist

A

Lang Lay

72
Q

Testing a crane after repairs shall not exceed___% of manufacturers load rating

A

110%

73
Q

Sorting hooks should be used at what angle? What happens to it 7 1/2 ton weight load limit when tip loaded

A

45° and is reduced to 2 tons

74
Q

What is D/d ratio

A

Ratio of hardware diameter compared to the wire rope diameter

75
Q

Duty cycle has _____% reduction from the rated capacity

A

20%

76
Q

Rigging gear fails at

A

Ultimate breaking strength

77
Q

What is the minimum number of wraps on a hoist drawn

A

2 wraps 

78
Q

What do the vertical lines indicate on a range diagram

A

Load radius

79
Q

What is the definition of lay in reference to wire rope

A

Rope lay signifies direction of wires and strands

80
Q

What would you use to lubricate wire rope

A

Light mineral oil that is not a corrosive and does not hinder rope inspection

81
Q

What is WSC

A

Wire strand core

82
Q

How do you determine parts of line required

A

SWL/PLP which ever is lower divided by the weight of suspended load

83
Q

What does a range diagram illustrate

A

Placement, boom length, Boom angle, load radius, jib and Jib offset, load height

84
Q

What is fatigue

A

Material being stressed to the point of failure

85
Q

What is IWRC

A

Independent wire rope core

Crane Class (18 decks)

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