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WorksheetsQUIZ -UNIT I & II
Total questions: 60
Worksheet time: 40mins
Permanent hardness in water is caused by the presence of:
Calcium bicarbonate
Magnesium sulfate
Both of them
None of them
Water is hard when it contains:
Acid solution
Precipitate in suspension
Dissolved sodium salts
Dissolved Ca and Mg salts
Which of the following does not cause the permanent hardness in water?
Nitrates
Sulphates
Chlorides
Bicarbonates
In _____________ when the water is heated then the soluble salts turns into insoluble ones and removed by filtration.
Temporary hardness
Permanent hardness
Non-carbonate
Non-alkaline
Scale formation in boilers causes
no loss of heat
wastage of heat
increase in efficiency
none of the above
Hard water is unfit for use in boilers for “steam raising” because
its boiling point is higher
steam generated at a high pressure
it leads to scale formation inside the boiler
water undergoes decomposition in to oxygen and hydrogen.
What is the function of a boiler?
to heat water to make steam
to heat water to make spaghetti
to transform liquid into a mist
to mix air and fuel
True or false. When water is heated to its boiling point, it changes from a liquid to a vapor.
true
false
priming is dangerous and can lead to ___ hammer
steam
water
gas
air
scale buildup on the water side of a steam boiler is caused by ___
an impure water supply
scale in raw water
improper boiler water treatment
none of the above
boiler water is treated to prevent...
scale
oxygen pitting
caustic embrittlement
all of the above
boiler water having high alkalinity could develop ___
acidic corrosion
oxygen pitting
caustic embrittlement
warping
The process of removing extra common salt from water is called:
Ionization
Softening
Disinfections
Desalination
Ion-exchange resin is __________
Soluble
Organic polymer with porous structure
Low molecular weight
Linear
Which of the following ion get released from the anion exchange column?
SO4-2
Cl–
OH–
CO3-2
Which of the following ion get released from the cation exchange column?
Ca+2
K+
Na+
H+
Ion-free water coming out from the exchanger is known as ____________
Demineralised water
Potable water
Disinfected water
Coagulated water
The exhausted cation exchange column is regenerated by passing a solution of ____________
Conc. NaCl
Conc. HCl
Dil. HCl
Dil. NaCl
The exhausted anion exchange column is regenerated by passing a solution of ____________
Dil. KOH
Conc. KOH
Conc. NaOH
Dil. NaOH
In ion-exchange process, the capital cost is _________ and the operational expenses are ______________
High, low
High, high
Low, low
Low, high
Large molecules made up of small monomers are called
polymers
peptides
peptones
monomers
Monomers of ethene in thousand numbers react together in addition polymerization to produce
polyamides
polyesters
poly(ethene)
all of them
Once formed, it can be heated and reformed over and over again
thermoset
thermoplastic
elastomer
kevlar
Which of these is an example of synthetic polymer?
cotton fibers
rubber
wool
polyvinyl chloride (PVC)
What is the name of the reaction used to make polymers?
polymerization
cracking
polygonization
precipitation
1,6-hexadiamine and hexanedioic acid are the monomers for
kevlar
nylon 6,6
nylon 6
terylene
Which of the following reaction is not accompanied by elimination of a byproduct molecule?
addition polymerization
condensation polymerization
both of the mentioned
none of the mentioned
Polymer classification based on structure are... EXCEPT
Network
Linear
Synthetic
Branched
Stages involve in addition polymerization EXCEPT
propagation
catalyst
termination
initiation
Monomer means
Big molecules
Small molecule s
Molecule
Not a molecule
Which of the following is true about plastic?
It's cheap
It's versatile (many uses)
It's disposable
All of the above
Name the plastic used for making water pipes
Polythene
PVC
Acrylic
Bakelite
Polythene which is used to make polythene bags is an example of a ________.
Thermoplastics
thermosetting plastics
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.
Composites always have at least a ______ and a _______
structure and tensile strength
matrix and structure
tensile strength and reinforcement
matrix and reinforcement
what is a matrix
fibers that give the composite strength
material that retains its own structure
working together of reinforcements and heat
continuous portion of the composites
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
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
Match the parts of 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 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 warm, soft molten polymer moves along the cylinder.
The polymer pellets are heated and melted.
The molten polymer is extruded into the mould.
