Worksheetswrsh
Total questions: 68
Worksheet time: 59mins
List three common tools of personal protective equipment (PPE)
(a)
List three properties of hand protection gloves that employee should be aware of before using it:
(a)
List two safety precautions while working in casting shop
(a)
-State the type of Cast Iron
(a)
State 4 from safety rules apply in casting work shop
(a)
State the classification of engineering materials
(a)
Draw stress-strain curve for ductile material?
list common pattern materials
(a)
What are the two major groups of metals? Define them
(a)
Name the precautions safety in Welding shop
(a)
Machinability
(a)
Hardness
(a)
Stiffness
(a)
Weldability
(a)
Ductility
(a)
Brittleness
(a)
Engineering Material is divided into metallic and non-metallic materials list the types of both metallic and non-metallic and give two examples for each one
(a)
Metal casting process
(a)
Metal welding process
(a)
Ferrous metal
(a)
h
b
name
Brittleness It is the ability to be resist fracture or deformation
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Compressive strength It is the ability of a material to withstand being scratched
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Steel is an alloy of iron and carbon with carbon content maximum up to 1.7%.
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Toughness measure of how much energy is required to break
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Ductility It is the ability to be elongated
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Low carbon or mild steel It possesses very low percentage of carbon varying from 0.05 to 0.15%.
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Dead carbon steel is sometimes known as mild steel also. It contains 0.20 to 0.30% C
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High carbon steels High carbon steels (HCS) contain carbon from 0.8 to 1.5%.
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If the instructor leaves the shop for any reason, the power should be shut off
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Nickel. Steels contain 2 to 5% nickel and from 0.1 to 0.5% carbon increase its strength and toughness.
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Chromium. It improves corrosion resistance (about 12 to 18% addition). It increases tensile strength, hardness, wear resistance and heat resistance.
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The wooden pieces should be fed to the sawing machines faster than the cutting speed of the machine.
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A core is a device used in casting and molding processes to produce internal cavities and reentrant angles
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Steel is an alloy of Iron and Oxygen
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Ceramic are metallic materials made of organic compound.
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Closed mold is consisting of two halves cope and drag
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In all cases, not clean machinery thoroughly when you have finished work
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Vanadium. It improves tensile strength, elastic limit, ductility, fatigue resistance, shock resistance and response to heat treatment.
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Keep tools and other materials in their proper places. Keep the floor clear of chip and objects.
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Two or more operator at a time should control a machine
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Aluminum. It improves magnetic permeability and decreases hysteresis losses.
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Do not work in the shop if too tired or fatigued
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Copper. It improves resistance to corrosion. It increases strength. More than 0.6 per cent copper for precipitation.
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Carbon. It decreases tensile strength and hardness. It increases ductility and weld ability.
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If I am unsure how to move some material I should
Ask a co-worker
Try different ways of doing it
Ask my supervisor
If a compressed gas cylinder is damaged it must be
Placed back in storage
Returned to the manufacturer
Repaired by a certified welder
When not in use, gas cylinders must be
Capped
Kept outside
Painted
If you see a broken part on a tool or piece of equipment you should
Tell a supervisor
Use it carefully
Try to repair it
Equipment Operating instructions are
Specific steps to follow every time
Only guidelines
For new employee
Thermoplastic materials are those materials which
Are flexible and can withstand considerable wear under suitable conditions
Do not become hard with the application of heat and pressure and no chemical change occurs
Are formed into shape under heat and pressure and results in a permanently hard product
Which of the following material has maximum ductility
Mild steel
Stainless steel
High speed steel
The percentage of carbon in cast iron varies from
0.1 to 1
1 to 1.7
1.7 to 4.5
Brass is an alloy of
Copper and zinc
Copper and tin
Copper, tin and zinc
The percentage of carbon in steel varies from
1 to 1.45
0.02 to 2.11
2.11 to 4.5
It is added in low carbon steels for preventing them from becoming porous.
Manganese
Silicon
Sulphur
Aluminum is a type of material that is:
Ferrous
non ferrous
nonmetallic material
The mold pattern is enlarged to account for
Solidification
buoyancy
shrinkage
The device for measure the stress with elongation is called
Impact test
hardness test
tensile test
The shear strength of a metal is usually
greater than or
less than its tensile strength?
Which one of the following materials has the highest hardness:
polystyrene
high carbon steel
hardened tool steel
gray cast iron
alumina ceramic
h
The strength and hardness of steel increases as carbon content
increases
decreases
Which of the following is the most important cast iron commercially
white cast iron
malleable iron,
gray cast iron
Ductile cast iron
Which of the following metals is noted for its good electrical conductivity
tungsten
nickel
iron
gold
copper
m,
