QUIZ
1) Cstr works on the principle of:
Heat Transfer
Mass transfer
Both heat and mass transfer.
None
2) Accumulation of mass in the reactor is given by:
Accumulation=[IN]-[Out]-[Generation]
Accumulation=[IN]-[Out]+[Generation]
Accumulation=[IN]+[Out]-[Generation]
Accumulation=[Out]-[IN}+[Generation]
3) Assumptions on which the CSTR works is/are:
Uniform mixing of the cooling fluid and reactor fluid
Heat transfer coefficient to the reactor jacket is constant.
Mean heat capacity is constant
All of the above
4) In Arrhenius rate law k=Aexp(-Ea/RT) Ea represents.
Frequency factor
Activation energy
Rate of the reaction
Constant
5) What do you understand by quasi steady state.
A permanent steady state
An unstable state
A state where the reaction rests for predestined time and then jumps back to steady state.
None of these
6) Which of these sets can act as the control parameters of the polymerization of styrene?
Feed rate of monomer,initiator,temperature of cooling fluid
Activation energy of the reaction.
Density of reactor fluid and cooling fluid
None of above
7) What do you understand by the term polymerization
Two or more simple compounds react to form a complex molecule
Two or more monomers react in a chemical reaction to form a large polymer
The large molecule formed by reacting of simple molecules generally containg a repeating structure
All of the above
8) What are the steps of the radical polymerization
Termination-propagation-initiation
Initiation-propagation-termination
Initiation-termination-propagation
Propagation-initiation-termination
9) Heat transfer expression in the CSTR is given by
Heat accumulation=[heat in]-[heat out]+[rate of heat generation]+[heat transfer]
Heat accumulation=[heat out]-[heat in]+[rate of heat generation]+[heat transfer]
Heat accumulation=[heat in]-[heat out]-[rate of heat generation]+[heat transfer]
Heat accumulation=[heat in]-[heat out]+[rate of heat generation]-[heat transfer]
10) The order of the reaction of polymerization of styrene is
Zero
First
Third
Second
11) Middle Steady state among multiple steady states is generally
unstable
stable
depends on time
none of above
12) In CSTR contents are
well stirred throughout
uniform throughout
well stirred but not uniform
well stirred and uniform throughout
13) If the heat of reaction is positive then reaction is _________, and if negative then __________
exothermic, endothermic
exothermic, exothermic
endothermic, exothermic
endothermic, endothermic
14) Process model for the free radical solution polymerization of styrene in a jacketed cstr involves
reaction kinetics
material balance
energy balance
all of these
15) Polysterene
inexpensive and soft
expensive and hard
inexpensive and hard
expensive and soft
16) Molecular formula of styrene is
C8H8
C8H10
C2H4
none of above
17) Molar mass of styrene is
104.15 g/mol
106 g/mol
28 g/mol
78.96 g/mol
18) During a step growth polymerization,what would happen for an addition polymerisation ?
Monomer molecules are still present in the final polymer.
Monomer breaks down to form free radicals.
Monomer breaks down to form ions.
Monomer disappears early in the reaction.
19) A co polymer can be found by:
Polymerising two different monomers
Polymerising two identical monomers
Mixing two different polymers
mixing two identical polymers.
20) The effect of chain transfer reagents is to:
Increase the average degree of polymerization
Reduce average degree of polymerization
Increase the rate of polymerisation.
Reduce the rate of polymerisation.
21) In ionic polymerisation "living Polymer" is formed when
termination reactions do not occur
propagation reactions do not occur
initiation reactions occur faster than termination reactions
Amino acids are used as monomers.
22) The free radical polymerisation, inhibitors
stop the formation of free radicals
increase the average degree of polymerisation
Increase the rate of polymerisation
Reduce average degree of polymerisation.
23) Which of the following is not a natural polymer
Silk
Starch
Nylon
protein
24) the monomer that is polymerized to make natural rubber is______________
melamine
ethylene
isoprene
adipic acid
25) as a polymer becomes more crystalline_____________
its melting point decreases
its density decreases
its yield stress decreases
none of the above
26) In the context of biopolymers ,the opposite of the polymerization process is___
sublimation
condensation
hydrolysis
addition
27) the monomer that is polymerized to make natural rubber is
melamine
formaldehyde
ethylene
isoprene
28) the formation of a condensation polymer generally involves_____
the addition of a plasticizer
the mixing of sulfur with an addition polymer
the elimination of a small molecule
the vaporization of a plasticizer
29) which of the following,only______is an addition polymer
polystyrene
polyurethane
polycarbonate
nylon
30) the empirical formula of an addition polymer______
is the same as that of the monomer from which it is formed except that 2 H and 1 O have been added
is the same as that of the monomer from which it is formed except that 2 H and 1 O have been subtracted
is the same as that of the monomer from which it is formed
is the same as that of the monomer from which it is formed except that 2 H and 1 C have been added