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This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Polymer Engineering knowledge and support exam preparation. Choose a topic below to get started.
1. |
With the introduction of solvents in modifying the initiator species and affecting the degradative chain transfer, the value of parameter kp2/kt , changes with the solvent concentration. State true or false. |
A. | True |
B. | Falses |
Answer» C. | |
2. |
Viscosity of the polymerization medium has a great influence on the termination process. State true or false. |
A. | True |
B. | Falses |
Answer» B. Falses | |
3. |
What is the value of intercept of the line plotted between the terms (2kt/kp2)(Rp2/[I][M]2) and Rp/[M], when there is simultaneous occurrence of bimolecular termination and termination by degradative process? |
A. | 2fkd |
B. | fkd |
C. | kt’/kp |
D. | [I] s |
Answer» B. fkd | |
4. |
What is the order of dependence of monomer concentration on Rp, in the exclusive case of degradative initiator transfer process? |
A. | 1 |
B. | 0 |
C. | 2 |
D. | 0.5s |
Answer» B. 0 | |
5. |
Consider initiator-monomer complexation in polymerization reaction, and a straight line is plotted between [M]3/Rp2 and [M]. What is the value of quotient of slope and the intercept? |
A. | equilibrium rate constant of monomer complexation reaction, K |
B. | termination rate constant, kt |
C. | propagation rate constant, kp |
D. | initiator concentrations |
Answer» B. termination rate constant, kt | |
6. |
VISCOSITY_OF_THE_POLYMERIZATION_MEDIUM_HAS_A_GREAT_INFLUENCE_ON_THE_TERMINATION_PROCESS._STATE_TRUE_OR_FALSE.?$ |
A. | True |
B. | False |
Answer» B. False | |
7. |
With_the_introduction_of_solvents_in_modifying_the_initiator_species_and_affecting_the_degradative_chain_transfer,_the_value_of_parameter_kp2/kt_,_changes_with_the_solvent_concentration._State_true_or_false.$ |
A. | True |
B. | False |
Answer» C. | |
8. |
What is the value of intercept of the line plotted between the terms (2kt/kp2)(Rp2/[I][M]2) and Rp/[M], when there is simultaneous occurrence of bimolecular termination and termination by degradative process? |
A. | 2fk<sub>d</sub> |
B. | fk<sub>d</sub> |
C. | k<sub>t</sub><sup>’</sup>/k<sub>p</sub> |
D. | [I]  |
Answer» B. fk<sub>d</sub> | |
9. |
How does the addition of solvents and additives, due to their abnormal effects, can affect the process of polymerization? |
A. | increase initiator efficiency |
B. | increase radical generation |
C. | enhance chain initiation rate |
D. | all of the mentioned |
Answer» E. | |
10. |
What is the order of dependence of monomer concentration on Rp, in the exclusive case of degradative initiator transfer process? |
A. | 1 |
B. | 0 |
C. | 2 |
D. | 0.5 |
Answer» B. 0 | |
11. |
What are the initiator and monomer orders, in limiting case of exclusive primary radical termination? |
A. | 0, 2 |
B. | 1, 2 |
C. | 1, 1 |
D. | 2, 0 |
Answer» B. 1, 2 | |
12. |
Which of the following can restrict the bimolecular termination? |
A. | high monomer concentration |
B. | insolubility of polymer formed in monomer |
C. | presence of solvents, additives |
D. | none of the mentioned |
Answer» C. presence of solvents, additives | |
13. |
What is the order of reaction with respect to initiator, considering exclusive case of unimolecular termination? |
A. | 1 |
B. | 0 |
C. | 2 |
D. | 0.5 |
Answer» B. 0 | |
14. |
Consider initiator-monomer complexation in polymerization reaction, and a straight line is plotted between [M]3/Rp2 and [M]. What is the value of quotient of slope and the intercept? |
A. | equilibrium rate constant of monomer complexation reaction, K |
B. | termination rate constant, k<sub>t</sub> |
C. | propagation rate constant, k<sub>p</sub> |
D. | initiator concentration |
Answer» B. termination rate constant, k<sub>t</sub> | |
15. |
Which of the following is not a reason for non-ideal kinetics of radical polymerization? |
A. | initiator-monomer complexation |
B. | unimolecular termination |
C. | degradative initiator transfer |
D. | none of the mentioned |
Answer» E. | |