Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Crane Class > Crane Refresher Practice Test > Flashcards

Crane Refresher Practice Test Flashcards

1
Q

List for criteria that make a critical lift

A

75% of rated capacity, personnel hoisting, special rigging procedures, two or more cranes (or hooks)used to make a lift

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What prevents the boom from falling when a hydraulic line fails 

A

Positive pressure holding valve/ check valves on the cylinder

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What are the where criteria for taking a hook out of service?

A

More than 5% wear in critical areas, 10% in other areas, no more than 1/4” inch at throat opening

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is fleet angle?

A

The maximum angle made by a rope with a line perpendicular with the drum on a crane. It would be centerline of points to the drum flange farthest from the perpendicular centerline. 1.5 degree smooth 2 degree grooved max

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Describe how to make a turn back eye with wire rope clips

A

Measure the dead end length, fasten first clip furthest from eye, 1 saddle width in from the end of tail, be sure to install all clips with saddle on the live end, install second clip closest to eye, with thimble placed in eye, install remaining clips evenly spaced between the 1st and 2nd, torque to manufacturers specification, then re-torque a second time. Never saddle a dead horse

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is PLP?

A

Permissible Line Pull. The rated pull capacity of a winch ( allowable in pounds)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Explain D/d ratio

A

The diameter of the wire rope compared to the diameter of the object it goes around

“D” divided by “d” = D:d ratio

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is the D/d ratio for different types of sheaves?

A

Block sheave 16:1
Boom point sheave 18:1
Boom hoist sheave15:1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

How are parts of line determined?

A

Suspended load divided by Safe Working Load SWL or PLP Permissible line pull 

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What class is 6x25 wire rope?

A

6x19 (6 strand 15-26 wires, 6x7 6x37 8x19)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is cabling?

A

When a multipart hoist spins/twists enough that different parts of line make contact

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What will reduce cabling?

A

Switch to even parts of line, reduce length of the fall, use rotation resistant rope, reeve fall symmetrically, change sheave size

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

How far out of level may a crane be before the load chart is not valid?

A

1%

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Short sections of boom go towards______

A

The boom base section

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Broken wire out of service criteria, rotation resistant rope.

A

2 wires in 6 diameters or 4 in 30 diameters. Personnel lifts add 1 valley break

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

wire rope sling broken wire criteria

A

5 wires in one strand in one lay , or 10 or more random wires in one lay

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Broken wire for running ropes

A

3 broken wires in one strand in one lay or 6 random broken wires in one lay

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Crane hook closest to the center of gravity picks _____ weight.

A

More

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

If a two crane pick is not made evenly, more load shifts to the upper or lower hook?

A

The lower hook

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Why would you want one crane to get more of the load in a two crane pick?

A

Offset C/G, odd sized or shaped load, different load capacities

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Wear criteria for taking wire rope out of service.

A

Reduction in diameter of 1/3 of the outside wires original diameter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Safety factor for running rope

A

Working 3.5:1
Erecting 3.0:1

23
Q

Safety factor for standing wire rope

A

3.0:1 working
2.5:1 erecting
Tower crane 5:1

24
Q

Safety factor for rotation resistant wire rope

A

5:1
10:1 for personnel lifting

25
Q

Reasons for taking wire rope out of service, other than wear and broken wires

A

Heat damage, corrosion, birdcaging, core protrusions, distortion, high stranding, dog legs, crushing, kinks

26
Q

What information is obtained from a load chart?

A

Gross capacity, boom length/angle/radius, deductions, warnings, operational notes, configurations

27
Q

List 7 reasons for backward tipping

A

Improper set up, severe unloading, two blocking, rigging failure, erratic swinging, traveling uphill with too high a boom angle, operator error, wind

28
Q

List the three types of shackles

A

Pin
Screw
Bolt

29
Q

Symmetrical reeving of fall block is best, avoids torsion loading of boom tip

A
30
Q

What is recommended for blocking (cribbing) off outrigger pads 

A

3 times the size of outrigger pad surface area, tight together and parallel

31
Q

What is the minimum allowable amount of wraps on a hoist/boom drum?

A

2 wraps minimum

32
Q

What is duty cycle?

A

Repetitive motion operation, for example digging, concrete, bucket, steel erection

33
Q

What is the chart reduction for duty cycle

A

20%

34
Q

What are the weights for these items per cubic foot in pounds?

Water
Steel
Concrete

A

Water 62 pounds per cubic foot
Steel, 490 pounds per cubic foot
Concrete150 pounds per cubic foot

35
Q

What is the efficiency of a Flemish eye

A

90%

36
Q

What is the efficiency of a wedge socket? (Becket)

A

80%

37
Q

What is the efficiency of wire rope clips

A

80% under 1 inch diameter
90% 1 inch and above

38
Q

What is the efficiency of a spelter socket?

A

100%

39
Q

What is the efficiency of a swaged fitting?

A

100%

40
Q

What should a tail length be on a wedge socket with regular rope? 

A

Six diameters of the wire rope, but never less than 6 inches

41
Q

What should the tail length to be on a wedge socket with rotation resistant wire rope?

A

20 diameters of the wire rope, and no less than 6 inches

42
Q

What makes wire rope more flexible

A

More wires equals more flex or softer core construction

43
Q

Maximum allowable throat opening for a hook

A

5% of the original dimensions, but no more than a quarter of an inch

44
Q

Other types of wire rope core besides IWRC

A

Fiber and synthetic

45
Q

Triple leg slings have 50% more capacity than double leg slings. Only if the center of gravity is in center of the connection point and legs are adjusted to equally share the load. Quad leg slings offer improved stability but do not provide increased lifting capacity.

A
46
Q

Only use drop forged wire, rope clips

A
47
Q

What is the criteria when measuring wire rope?

A

Measure crown to crown, 3 times for 6 strand wire and 4 times for 8 strand wire

48
Q

How is safe working load (SWL) determined

A

Ultimate breaking strength divided by the safety factor

49
Q

Two categories of weight chart

A

Stability, and structural

50
Q

How far back from a hole 10 feet deep is recommended

A

1 to 1 plus 2’ for the berm = 12’
10” plus 2” for the berm= 12”

51
Q

Sorting hooks should be used at an angle less than___degrees

A

45°

52
Q

A 7 1/2 ton sorting hook tip loaded it will only be good for about two tones 

A
53
Q

Out of service speeds for wind

A

20MPH when lifting personnel
30MPH

54
Q

Load angle factors

90°
60°
50°
45°
30° 

A

90° 1.0
60°, 1.155
50°, 1.305
45°, 1.414
30° 2.0 

Crane Class (18 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions