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WorksheetsUNIT II- QUIZ II
Total questions: 40
Worksheet time: 40mins
Identify the type of plastic that can best be used to make electrical switches.
PVC
Polythene
PET
Bakelite
Select the correct option from the given statements.
Polymers cannot form fibres
Polymers can be both natural and synthetic
Polymer is a natural substance
Polymer is a synthetic substance
What are the 2 types of Polymers?
Thermosetting Plastics
Thermochromic Plastics
Thermoplastics
Thermopolymers
Which type of chain would be found in a thermosetting plastic?
Branched chain
Continuous chain
Cross linked chain
Linear chain
Thermosetting Plastics
Can be reshaped using heat and pressure.
Are lighter plastics
Can be recycled
Can not be reshaped using heat and pressure
Thermoplastic polymers melt when heated, while thermosetting polymers do not melt when heated. True or false?
True
False
All plastics are man made and do not biodegrade.
True
False
Polythene and PVC are examples of
Bio degradable substance
Thermosetting plastics
Thermoplastics
Rayon
The following are the benefits of Compression Moulding, EXCEPT,
Low Cost
Little Waste
Produce Large Parts
High Production Rate
Once formed, it can be heated and reformed over and over again
thermoset
thermoplastic
elastomer
kevlar
Thermoplastic have...
good surface finish, UV resistance, recyclabillity
good surface finish, low strength, can't be reformed with heat
good dimensional stability, low strength, good heat resistance
high regidity, UV resistant, can be reformed with heat
Which of these is an example of synthetic polymer?
cotton fibers
rubber
wool
polyvinyl chloride (PVC)
A thermoplastic polymer will be ______________________.
below its glass transition temperature.
soft and flexible
rigid and brittle
translucent
rubbery
Urea formaldehyde is which sort of polymer?
Thermo setting
Thermo plastic
Elastomer
Composite
The process of heating and compressing the preform material in to the mould is ___________.
Blow moulding
Transfer moulding
Injection moulding
Compression moulding
In compression moulds, polymerization of plastic takes place in _____________.
machine
mould
material
hopper
The plastic used in compression molding is __________.
thermoset plastic
thermoplastic
PMMA
PVC
Thermoset Plastic parts are manufactured by __________ process.
Compression moulding
Blow moulding
Rotational moulding
Extrusion
Which plastic manufacturing process involves forcing melted plastic through a shaped opening in a "die" to create a continuous piece which is then often cut to length.
Injection Molding
Extrusion
Blow Molding
3D Printing
Which formation thecnique would you use for a STRAW
Extrusion
Injection
Blow moulding
Compression moulding
Vacuum forming
Which plastic process continuously compresses melted plastic through an opening (called a die) to create a long plastic piece that can then be cut to length?
Extrusion
Injection Molding
Blow Molding
Blown Film
Match the parts of the the diagram.
The screw rotates.
The polymer pellets are transferred from the hopper to the cylinder.
The plastic bottle is ejected.
The molten polymer is extruded into the mould.
Match the parts of the diagram.
The polymer pellets are heated and melted.
The warm, soft molten polymer moves along the cylinder.
The two halves of the mould are closed with the molten polymer inside.
The polymer pellets are transferred from the hopper to the cylinder.
The plastic bottle is ejected.
Match the parts of the diagram.
The molten polymer is extruded into the mould.
The cold polymer pellets are moved along the cylinder.
The plastic bottle shape is cooled
The screw rotates.
Match the parts of the diagram.
The two halves of the mould are closed with the molten polymer inside.
The polymer is expanded to fit the shape of the mould.
The molten polymer is extruded into the mould.
The molten polymer is inflated by the compressed air.
Match the parts of the diagram.
The two halves of the mould are closed with the molten polymer inside.
The warm, soft molten polymer moves along the cylinder.
The polymer pellets are heated and melted.
The molten polymer is extruded into the mould.
Match the parts of the diagram.
The molten polymer is inflated by the compressed air.
The polymer pellets are heated and melted.
The warm, soft molten polymer moves along the cylinder.
The plastic bottle shape is cooled
Match the parts of the diagram.
The cold polymer pellets are moved along the cylinder.
Compressed air is blown inside the molten polymer.
The plastic bottle shape is cooled
The polymer pellets are heated and melted.
What is the definition of a composite?
Composites are when you weld two or more metals together to form a new type of metal.
Composites are a combination of two or more materials that are bonded together to improve their mechanical or physical properties.
Composites are when you take 2 or more metals and fuse them through melting.
Composites are when you take 2 or more matrix and mix them to create a new material.
Laminated glass is often used to make...
Greenhouses
Windows in high-rise buildings
Windows in residential buildings
Vehicle windshields
Composites always have at least a ______ and a _______
structure and tensile strength
matrix and structure
tensile strength and reinforcement
matrix and reinforcement
what is reinforcement
fibers or particles that give the composites strength,stiffness and density
a composite with different sets of properties than its constituent materials
decrease in cracking by distributing stress evenly
fillers added to save money or modify properties
Which of the following is not a composite material
MDF
Carbon fibre
Arimid fibre
Structural concrete
Glass
In CFRP the carbon fibres are know as the
Matrix
Reinforcement
Filler
Structure
