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Corrected paper 1.3.doc

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  LEEA Correspondence Courses ASSIGNMENT 1.3 Please note: Use the up and down cursor keys to move between fields in this form.Enter your name and student number in the spaces below. Name:             Student number:             Each question has several answers, only one of which is correct. Select your answer by typing # inthe box. When complete, save the file using the same name . Then use the upload facility to return it for marking. 1.The single most important property of materials used in the manufacture of lifting equipment is:   Toughness # Strength  Brittleness  Ductility2.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 tension3.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 tension4.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 tension5.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 resistant6.It is generally true that a tough material will also be: # Strong  Elastic  Plastic  Malleable training\1-3e 1  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 brittle8.Ferrite is the base element of:   Polymers  Brass and bronze# Iron and steel  Aluminium9.The inclusion of up to 1% phosphorous in bronze makes it:   Weaker # Stronger   More prone to corrosion  Un-machineable10.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 welded11.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 runways12.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 hammering13.Steels with a carbon content of 0.25% to 0.33% are known as:   Mild steels# Higher tensile steels  Alloy steels  Stainless steels14.Higher tensile steel is:   Weaker than wrought iron  One third weaker than mild steel  Stronger than alloy steel# One third stronger than mild steel training\1-3e 2  15.A steel with added nickel, chromium and molybdenum is known as:  Mild steel  Higher tensile steel  High tensile steel# Alloy steel16.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 welded17.Metals with little or no iron in their composition are known as:  Polymers  Plastics  Ferrous metals# Non-ferrous metals18.Sisal is the product of:  The cotton plant  The wild banana tree# Cactus  Cannabis grass19.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 runways20.Chemically based man-made materials, of long chain like molecules, with a carbon backbone are known as:   Latex  Neoprene# Polymers  Plantain Marking Answers still shown in black were correctAnswers now shown in red were incorrect – the correct answers are shown in blue Result 100% training\1-3e 3

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Sep 10, 2019

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Sep 10, 2019
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