LEEA Correspondence Courses
ASSIGNMENT 1.3
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1. The single most important property of materials used in the manufacture of lifting equipment is:
Toughness
# Strength
Brittleness
Ductility
2. Ductility is:
The tendency to fracture without visible plastic deformation
The ability of a material to return to its original dimensions after the removal of the stress
The ability to resist rupture when a load is applied
# The ability to undergo cold plastic deformation, usually as the result of tension
3. Strength is:
The tendency to fracture without visible plastic deformation
The ability of a material to return to its original dimensions after removal of the stress
# The ability to resist rupture when a load is applied
The ability to undergo cold plastic deformation, usually as the result of tension
4. Brittleness is:
# The tendency to fracture without visible plastic deformation
The ability of a material to return to its original dimensions after removal of the stress
The ability to resist rupture when a load is applied
The ability to undergo cold plastic deformation, usually as the result of tension
5. A material needs to display hardness so that:
It will resist shock loads
It will not deform under load
# It will resist wear and abrasion
It will corrosion resistant
6. It is generally true that a tough material will also be:
# Strong
Elastic
Plastic
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Malleable
7. Materials that are elastic will:
# Return to their original dimensions when the stress is removed
Retain their new dimensions when the stress is removed
Also be malleable
Tend to become brittle
8. Ferrite is the base element of:
Polymers
Brass and bronze
# Iron and steel
Aluminium
9. The inclusion of up to 1% phosphorous in bronze makes it:
Weaker
# Stronger
More prone to corrosion
Un-machineable
10. Cast iron is:
Ideal for the manufacture of chain fittings as it has high tensile strength
Highly resistant to corrosion
# Used to make jack bodies as is has high compressive strength
Widely used in lifting equipment manufacture as it is easily welded
11. Typical uses of cast iron in lifting equipment are:
Shackle and eyebolt manufacture
Chain and chain sling manufacture
# Trolley wheel and rope sheave manufacture
The manufacture of end stops and travel stops for cranes and runways
12. A ‘killed steel’ is one which:
# Has been treated to remove the oxygen during smelting
Has been overheated during rolling so removing the carbon
Has become plastic due to repeated rolling
Has become very ductile due to constant hammering
13. Steels with a carbon content of 0.25% to 0.33% are known as:
Mild steels
# Higher tensile steels
Alloy steels
Stainless steels
14. Higher tensile steel is:
Weaker than wrought iron
One third weaker than mild steel
Stronger than alloy steel
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# One third stronger than mild steel
15. A steel with added nickel, chromium and molybdenum is known as:
Mild steel
Higher tensile steel
High tensile steel
# Alloy steel
16. A high carbon content in iron and steel:
Makes it very easy to weld
Makes it impossible to weld
# Makes it less easy to weld
Makes it liable to smelt when welded
17. Metals with little or no iron in their composition are known as:
Polymers
Plastics
Ferrous metals
# Non-ferrous metals
18. Sisal is the product of:
The cotton plant
The wild banana tree
# Cactus
Cannabis grass
19. The use of timber for loadbearing structural members is:
To be recommended due to its low cost when compared to steel
# Effectively banned
Common for derrick cranes
Common for gantries and runways
20. Chemically based man-made materials, of long chain like molecules, with a carbon backbone are known as:
Latex
Neoprene
# Polymers
Plantain
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