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1ST YEAR WELDING > MATERIALS HANDLING 120101J > Flashcards

MATERIALS HANDLING 120101J Flashcards

1. Identify safe procedures for handling and storing materials. 2. Determine weight and centre of gravity of loads. 3. Describe the effect that sling angles have on safe lifting. 4. Identify the load limits of commonly used wire rope slings and synthetic slings. 5. Describe the causes and effects of shock loading on rigging. 6. Identify Occupational Health and Safety Regulations regarding safety factors. 7. Identify and use hand signals for crane operations. 8. Describe safe procedures fo

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1
Q

Before attempting to lift an object, you should determine its:

a) length.
b) width.
c) weight.
d) height.

A

c) weight.

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2
Q

If you have to carry a heavy object, what is the best way to hold it?

a) on your shoulder
b) at arms length
c) on your hip
d) close to your body

A

d) close to your body

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3
Q

What should you do if you are helping to move a suspended load?

a) pull the load towards yourself
b) stand under the load
c) guide and follow the load
d) stand on top of the load

A

c) guide and follow the load

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4
Q

What is the safest method of storing loose materials?

a) put them in containers or bins
b) pile them up into the shape of a pyramid
c) stack them according to size on shelves
d) stack them against a wall according to length

A

a) put them in containers or bins

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5
Q

What is the approximate weight of a piece of steel that is 305 mm by 305 mm and 25.4 mm thick (one foot by one foot and one inch thick)?

a) 4.5 kg (10 lb)
b) 18.5 kg (40 lb)
c) 37.0 kg (80 lb)
d) 45.5 kg (100 lb)

A

b) 18.5 kg (40 lb)

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6
Q

What is the approximate weight of a pipe that is 305 mm (12”) in diameter and 3660 mm (12’) long with a wall thickness of 6.4 mm (1/4”)?

a) 17 kg (38 lb)
b) 176 kg (377 lb)
c) 205 kg (452 lb)
d) 2053 kg (4523 lb)

A

b) 176 kg (377 lb)

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7
Q

Where is the centre of gravity of an object located?

a) at the point where it weighs the least
b) at the point where it lands when dropped
c) at the point that causes it to topple over
d) at the point where the object will balance

A

d) at the point where the object will balance

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8
Q

What can happen if you lift a load with the centre of gravity above the lifting points?

a) The load could slide out of the slings.
b) The load could damage the slings.
c) The load could tip over or shift.
d) You could lift the load higher.

A

c) The load could tip over or shift

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9
Q

What is the definition of sling angle?

a) the angle formed between the two slings
b) the angle formed by the legs to the horizontal plane
c) the angle formed by the legs to the vertical plane
d) the angle made by the hook when it is lifting

A

b) the angle formed by the legs to the horizontal plane

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10
Q

A small change in sling angle can drastically affect the:

a) sling load.
b) boom angle.
c) load angle.
d) load weight.

A

a) sling load.

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11
Q

At what sling angle does the load on each leg of a two-legged sling equal the weight of the load?

a) 15
b) 30
c) 45
d) 60

A

b) 30

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12
Q

The rule of thumb formula to find the working load limit of a wire rope sling or choker is D2 x 5 = WLL in tons. What is the WLL of a 1/2” wire rope sling?

a) 10 tons
b) 5 tons
c) 2.5 tons
d) 1.25 tons

A

d) 1.25 tons

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13
Q

When using the choker stress formula to calculate the tension per leg in pounds, why should you use only two legs in the formula?

a) It is easier to divide the weight by two.
b) The choker has two ends.
c) Two legs may carry all the weight.
d) So the centre of gravity does not move.

A

c) Two legs may carry all the weight.

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14
Q

Which statement is true with respect to synthetic web slings?

a) They are heavier than wire rope slings.
b) They are lightweight and very flexible.
c) They can lift on sharp corners without padding.
d) Irregularly shaped loads cannot be lifted.

A

b) They are lightweight and very flexible.

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15
Q

What is the approximate maximum working load limit for a 3” wide nylon sling (8000 lb/in material) using a single choker hitch? (See Table 1.)

a) 2400 lb
b) 3600 lb
c) 4800 lb
d) 9600 lb

A

b) 3600 lb

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16
Q

A load resulting from a rapid change of movement such as impacting or jerking is called a:

a) shock load.
b) static load.
c) working load limit.
d) rated load.

A

a) shock load.

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17
Q

What is one cause of a shock load?

a) contacting an overhead power line
b) using an oversized wire rope
c) applying power smoothly and steadily
d) having the load bounce while it is lifted

A

d) having the load bounce while it is lifted

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18
Q

A shock load is generally ___________________________________ a static load.

a) the same as
b) significantly less than
c) significantly greater than
d) the opposite of

A

c) significantly greater than

A shock load is generally significantly greater than a static load.

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19
Q

What unfavourable situation could result from shock loading?

a) The overstressed rope may later fail without warning.
b) The rope gets shorter and exceeds the drum capacity.
c) The WLL rating of the rope will be increased.
d) A fast acceleration cannot be used to lift the load.

A

a) The overstressed rope may later fail without warning.

20
Q

Where the rigging was assembled or fabricated by the employer, what percent of the ultimate breaking strength of the weakest component must the working load not exceed if the rigging is used to support workers?

a) 10%
b) 20%
c) 30%
d) 40%

A

a) 10%

21
Q

How often must an employer inspect the rigging to be used during a work shift, to ensure it is safe and functional?

a) Whenever it is practical.
b) Once a month.
c) Beginning of each shift.
d) Quarterly per year.

A

c) Beginning of each shift.

22
Q

The working load limit on rigging equipment may not exceed ___________ of the ultimate breaking strength of the weakest component of the rigging, if the rigging is used for lifting steel structures only.

a) 10%
b) 20%
c) 30%
d) 40%

A

b) 20%

The working load limit on rigging equipment may not exceed 20% of the ultimate breaking strength of the weakest component of the rigging, if the rigging is used for lifting steel structures only

23
Q

All components of rigging must be thoroughly inspected:

a) at the start of each day.
b) at the start of each shift.
c) once a week by the foreman.
d) once a month by OH&S.

A

b) at the start of each shift.

24
Q

What is the hand signal for an emergency stop when hoisting a load?

a) both arms straight up over your head
b) one arm horizontal and one arm vertical
c) both arms straight out from your shoulders
d) both arms straight down at your sides

A

c) both arms straight out from your shoulders

25
Q

Which signal indicates boom down?

a) arm position horizontal and thumb pointing down
b) arm position horizontal and thumb pointing up
c) arm position horizontal and fingers pointing down
d) arm position vertical and thumb pointing down

A

a) arm position horizontal and thumb pointing down

26
Q

Which signal indicates hoist load?

a) arm straight out with thumb pointing upwards
b) arm vertical with fingers pointing upwards
c) both arms straight up in a vertical position
d) forearm vertical, forefinger pointing up, small circles.

A

d) forearm vertical, forefinger pointing up, small circles.

27
Q

Which signal indicates lower the boom and raise the load?

a) thumb pointing down and other hand under thumb
b) thumb pointing up and other hand above thumb
c) thumb pointing down and fingers moving back and forth
d) thumb pointing up and fingers moving back and forth

A

c) thumb pointing down and fingers moving back and forth

28
Q

What is used to prevent slings from being cut by sharp corners of the load?

a) splitters
b) softeners
c) equalizers
d) spreaders

A

b) softeners

29
Q

Which hitch is excellent for lifting pipe and tubing because it makes a full 360 contact and pulls the load together?

a) single basket hitch
b) double basket hitch
c) double choker hitch
d) double wrap basket hitch

A

d) double wrap basket hitch

30
Q

When using a double choker hitch to lift a pipe, which way should the hooks be pointing?

a) it does not matter
b) one each way
c) both pointing out
d) both pointing in

A

c) both pointing out

31
Q

What is the problem if the main hoist line hangs off centre to the raised boom?

a) The crane is not level.
b) The jib is not installed.
c) A boom pin is missing.
d) The bearing mat is flat.

A

a) The crane is not level.

32
Q

Which type of wire rope reduces the chance of failure by fatigue caused by constant bending over sheaves and around drums?

a) a rope with 6 strands and 1 wire per strand
b) a rope with 6 strands and 6 wires per strand
c) a rope with 8 strands and 19 wires per strand
d) a rope with 8 strands and 26 wires per strand

A

d) a rope with 8 strands and 26 wires per strand

33
Q

The rule of thumb working load limit for wire rope is D2 x 8 = WLL (in tons). What is the WLL of 3/4” diameter wire rope?

a) 4.5 tons
b) 5.6 tons
c) 10.6 tons
d) 12.0 tons

A

a) 4.5 tons

34
Q

A knot in a fibre rope can reduce the strength of the rope by approximately:

a) 5%.
b) 15%.
c) 50%.
d) 85%.

A

c) 50%.

35
Q
  1. Which synthetic fibre rope is the strongest?
    a) nylon
    b) polyester
    c) polypropylene
    d) polyethylene
A

a) nylon

36
Q

Why are chains better suited than wire rope for certain jobs?

a) Chains do not get damaged from shock loading.
b) Chains withstand rougher handling and will not kink.
c) A damaged link can be welded while holding the load.
d) You can tie a knot in a chain and use it safely for lifting.

A

b) Chains withstand rougher handling and will not kink.

37
Q

Why should alloy chain, not be welded or subjected to excessive temperatures?

a) The chain links will tend to stretch under shock loading.
b) Excessive heating will cause the links to stretch too much.
c) A welded chain is not as flexible, so it cannot be looped.
d) The heat treatment will be affected and the chain will lose its strength.

A

d) The heat treatment will be affected and the chain will lose its strength.

38
Q

What is the maximum number of plates that can be lifted safely using a plate clamp with a locking grip?

a) one
b) two
c) three
d) as many as will fit between the jaws

A

a) one

39
Q

When U-bolt type clips are used for wire rope fastening, where is the U-bolt section applied?

a) on either side of the rope
b) alternating on each side
c) on the live end of the rope
d) on the dead end of the rope

A

d) on the dead end of the rope

40
Q

How many U-bolt type wire rope clips should be installed when making an eye using 1/2” wire rope? (See Table 6.)

a) one
b) two
c) three
d) four

A

c) three

41
Q

A tagline is:

a) a number informing personnel of shop procedures.
b) a small dialmeter wire rope.
c) a fibre rope used to control the load.
d) a metal tag attached to chain slings.

A

c) a fibre rope used to control the load.

42
Q

A clove hitch:

a) can be used to attach rope to a post or pipe.
b) can be used to haul personnel.
c) reduces the fibre rope to 25% of its working strength.
d) is a good non-slip knot.

A

a) can be used to attach rope to a post or pipe.

43
Q

A bowline knot:

a) slips easily when load is applied.
b) can be used for hoisting safety personnel.
c) is easy to tie and untie when a load has been applied.
d) is a hitch type knot.

A

c) is easy to tie and untie when a load has been applied.

44
Q

What hitch would be best used as a back-up to other knots/hitches?

a) timber hitch
b) catspaw
c) half hitch
d) carrick bend

A

c) half hitch

45
Q

A knot in a rope:

a) increases the rope strength by 50%.
b) increases the rope strength by 25%.
c) decreases the rope strength by 50%.
d) decreases the rope strength by 25%.

A

c) decreases the rope strength by 50%.

1ST YEAR WELDING (9 decks)

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