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Millwright > Rigging And Hoisting > Flashcards

Rigging And Hoisting Flashcards

1
Q

Of a block and tackle with 5 rope falls and minimum friction, how much force is needed to retain 250lbs?

A

50 lbs (250 Γ· 5)

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2
Q

What diameter rope is needed to support 2 tons using a vertical lift?

A

1/2”

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3
Q

What is the standard safety factor to consider for platform supporting people?

A

10:1

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4
Q

If a wire rope has a breaking strength of 15000 lbs, determine the safe working load under normal lifting conditions.

A

3000 lbs

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5
Q

Hi πŸ‘‹

A

Good job, Keep it up !

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6
Q

What type of lifting technique has the least lifting capacity ( if all use the same rope) ?

A

Choker sling

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7
Q

What type of sling presentation will accept 200% of the SWL? ( Safe working limit)

A

Basket

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8
Q

The signal for stop in rigging is what?

A

Flat of hand waved across chest

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9
Q

The construction of a wire rope is determined by the direction of the twist of strands. This is known as what?

A

Lay

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10
Q

What type (number) of flexible wire rope for overhead Crane use?

A

6-37

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11
Q

A type of knot used to tie 2 lines of the same size together so they will not slip is called?

A

Reef

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12
Q

What sling setup can achieve good gripping action?

A

Choker

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13
Q

When using a swivel eyebolt for rigging, what must you do?

A

Make sure it is torqued correctly

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14
Q

A signal person has their arm at 90Β°, and thumbs pointing inwards. What is this signal?

A

Retract boom

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15
Q

You are using an electromagnet magnet drill to drill a hole in an I-beam. What is the 1st safety precaution to take?

A

Rig the drill to the beam

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16
Q

What stops the Crane block at the top?

A

Upper limit switch

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17
Q

What are double clip hooks used for?

A

Use for human safety harnesses

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18
Q

What is the distance between slings if you are using a 2 part bridle with 2 slings at 60ﾟ, and each sling is 46” long?

A

46”

19
Q

What type of rope is not to be used in high heat environments?

A

Manila

20
Q

What is the calculation for the SWL (safe working load) of a 4 part bridal?

A

SWL X H/L X 3

21
Q

What do you use to lift an acetylene container?

A

Suitable cradle

22
Q

What is the lift capacity of a 6000 lbs breaking strength rope when used on a platform supporting people?

A

600 lbs (6000Γ·10)

23
Q

What prevents the lower and upper chain blocks from touching?

A

Limit switch

24
Q

What is a turnbuckle used for?

A

Leveling the load( adjusting tension)

25
Q

If you are 60” away from a Crane, looking up at a 45ﾟ angle to the boom, what is the boom height if it is in the vertical position?

A

60”

26
Q

How is the mechanical advantage gained in a rope fall?(pulleys)

A

By the # of rope falls

27
Q

What is a tag line used for?

A

To prevent the swinging of the load

28
Q

What term is given to the opening of a hook?

A

Throat

29
Q

What is a continuous piece of rope called?

A

Endless sling

30
Q

High stranding of one layer of wire rope is called what?

A

Bird caging

31
Q

What type of rope is used for heavy lifting?

A

6-7

32
Q

What happens to a rope when it is unwound incorrectly?

A

Kinking

33
Q

How are cable clips installed?

A

Saddles are on the live side only

34
Q

What is the safe working limit of a 3/8” diameter rope in a 2 part bridal configuration at 60ﾟ lifting angle?

A

4000 lbs

35
Q

The signal of the finger rotated in the palm of the hand means what?

A

Everything slow

36
Q

When are wire ropes replaced?

A

When 3 or more broken wires are found a one strand of 1 lay

37
Q

Using the average weight of 500 lbs per cubic foot for steel, calculate the approximate weight of a plate you want to lift that is 6” long, 5’ 8” wide, and 1 1/4 β€œ thick.

A

1700 lbs

38
Q

A hand signal where thumb is pointing upwards and fingers on same hand are flexing means what?

A

Boom up load down

39
Q

What is the type of rope for good flexibility?

A

6-37

40
Q

What is the correct way to store a sling?

A

Hanging vertically

41
Q

What is used on a shackle pin when lifting a rotating load?

A

Safety pin

42
Q

What is used with a Crane to move a load horizontally?

A

Snatch block

43
Q

What type of lift is used for a bundle of pipes?

A

Double wrap choker

Millwright (11 decks)

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