Karnataka PGCET 2017 Question Paper Polymer Science and Technology

POST GRADUATE COMMON ENTRANCE TEST-2017
DATE and TIME COURSE SUBJECT
ME/M.Tech/M.Arch/
01 -07-2017 POLYMER SCIENCE &
courses offered by
2.30 p.m. to 4.30 p.m. TECHNOLOGY
VTU/UVCE/UBDTCE
MAXIMUM MARKS TOTAL DURATION MAXIMUM TIME FOR ANSWERING
100 150 Minutes 120 Minutes
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Marks Distribution
PART-1 : 50 QUESTIONS CARRY ONE MARK EACH (1 TO 50)
PART-2 : 25 QUESTIONS CARRY TWO MARKS EACH (51 TO 75)

PO-Al iii 11111111111

Od Z I -V

POLYMER SCIENCE AND TECHNOLOGY

PART — 1

Each question carries one mark. (50 x 1 = 50)

1. Most important to separate a mixture 4. Metals are good heat conductors,
of two volatile liquids by distillation is
because
(A) Solubility
(A) of free electron present
(B) Relative volatility

(C) Density difference (B) of their atoms are relatively far

(D) Selectivity apart

(C) of their atoms collide frequently
2. Alcohol is dehydrated using

(A) Extractive distillation (D) of presence of free ions

(B) Azeotropic distillation

(C) Steam distillation
5. Heat transfer by radiation between two
(D) Molecular distillation
surfaces can be decreased by

3. The ratio of flux to concentration (A) Bringing the surfaces together
gradient is called
(B) Polishing the surfaces
(A) Thermal diffusivity

(B) Eddy diffusivity (C) Providing a radiation shield

(C) Mass transfer coefficient between the surfaces

(D) Volumetric diffusivity (D) controlling humidity

PO 3 A-1

6. An exchanger in which hot and cold 9. Cp — Cv = R is valid for

fluids flow over heat transfer
(A) Real gas
alternatively is
(B) Ideal gas
(A) Direct contact exchanger
(C) All gases
(B) Regenerator
(D) Gases at very high pressure and
(C) Parallel flow exchanger low temperature

(D) Free convection

10. During isothermal expansion of an

7. An example of extensive property is ideal gas, its

(A) Refractive index (A) Enthalpy reduces to zero

(B) Enthalpy decreases
(B) Viscosity
(C) Internal energy increases
(C) Internal energy
(D) Enthalpy remains unaffected
(D) Surface tension

8. Thermodynamic property of a system 11. A system in which there may be
exchange of energy but not mass is
is
known as
(A) Entropy
(A) Classed system
(B) Density
(B) Isolated system
(C) Viscosity
(C) Open system
(D) Concentration
(D) Insulated system

A-i 4 PO

12. All spontaneous process are 15. In laminar flow, maximum velocity at
the centre of the pipe is how many
(A) Reversible adiabatic
times to the average velocity

(B) Reversible (A) Zero

(C) Adiabatic (B) Two

(D) Irreversible (C) Three

(D) Four

A fluid in which resistance to
dethrmation is independent of the 16. A flow in which each liquid particle
has a definite path and their paths do
shear stress is called
not cross each other is called
(A) Bingham plastic fluid
(A) Steady flow
(B) Pseudo plastic fluid
(B) Stream line flow

(C) Dilatant fluid (C) Uniform flow

(D) Newtonian fluid (D) Turbulent flow

17. Head loss in turbulent flow in a pipe
14. A large Raynold number is indication
of (A) varies directly as velocity

(A) Highly turbulent flow (B) varies inversely as square of
velocity
(B) Steady flow
(C) varies approximately as square
(C) Laminar flow of velocity

(D) Smooth and stream line flow (D) varies inversely as velocity

PO • 5 A-1

18. Two forces most important in laminar 21. Equivalent weight of AT,(SO4)3 is
flow between closely parallel plates (if molecular weight is 342)
are
(A) 570
(A) Viscous and pressure
(B) 57
(B) Inertial and viscous
(C) 5.7
(C) Pressure and inertial
(D) 34.2
(D) Gravity and pressure

19. Converting 100 kg/h of water flow rate 22. Moles of 0, in 500 g is

to litres/second gives a value of
(A) 5.0 g moles
(A) 0.028
(B) 50 g moles
(B) 0.238
(C) 15.62 g moles
(C) 10.03
(D) 1.56 g moles
(D) 2.834

23. The volume of chlorine gas at 230 °C
20. If a solution contains 30 kg of sugar and 150 atm using ideal gas law is
and 50 kg of water, mass fraction of
sugar is (Given R = 0.082051. atm/g mol. °k)

(A) 0.50 (A) 0.275 litres

(B) 3.76 (B) 2.86 litres

(C) 0.375 (C) 28.7 litres

(D) 0.48 (D) 287 litres

A-1 6 PO

24. The SI unit of mass flux is 27. Polyurethane is the reaction product of

(A) kg/m2.s (A) Diacids + Diamines

(B) //m2.h (B) Diols + Diols

(C) Diacids + Diols
(C) g/m2.s

(D) Disocyanates + Polyols
(D) /b/m.s

28. By-products formed during poly
25. is added to reduce the Tg of a
condensation are removed to prevent
polymer.
reversible reaction by
(A) Plasticizer
(A) Sublimation
(B) Sulphur
(B) Fractionation
(C) Antioxidant
(C) Crystallization
(D) Carbon black
(D) Distillation

26. Which of the following is thermoset
29. additive is added during
resin
polymerization.

(A) Nylon 6
(A) Thermal stabilizer

(B) Epoxy (B) Chain transfer agents

(C) NBR (C) Plasticizer

(D) PS (D) Antioxidants

PO 7 A-1

30. A physical mixture of matrix and filler 34. LLDPE is produced from
is referred as (A) Low pressure process
(A) Blends
(B) High pressure process
(B) Alloys
(C) Unipol process
(C) Composites
(D) Plasma polymerization
(D) Copolymer

35. monomer is used tbr Nylon 6
31. polymerization technique production.
gives latex.
(A) E-caprolactum
(A) Solution polymerization
(B) Adipic acid + Hexamethylene
(B) Emulsion polymerization
Tetramine
(C) Bulk polymerization
(C) TDI Polyol
(D) Suspension polymerization
(D) Diol Diacid

32. polymerization mechanism
36. Glass transition temperature of
is used to produce living polymers.
polymer can be measured by
(A) Free radical polymerization
(A) DSC
(B) Coordination polymerization
(B) TGA
(C) Anionic polymerization
(C) Spectrophotometer
(D) Condensation polymerization
(D) GPC

33. Which product is produced from
37. Which of the following is copolymer ?
rotational molding ?
(A) ABS
(A) Disposable cups
(B) Table spoon (B) PP

(C) Water tank (C) PVC

(D) Water bottle (D) PMMA

A-1 8 PO

38. Extrusion can be used to produce 42. The half-life period of a first order
reaction and the rate constant are
(A) Disposable syringes
related as
(B) Tumbler mat
(A) to ) = 2.303/k
(C) Pipes

(D) Compact disc (B) t(i ) k

(C) t (1 ) = 0.693 k
39. is used as mold release
ao-ents• (D) t(i 0.693/k
‘21
Silicone fluids

Ethylene glycol
43. In a reaction, the threshold energy is
Acetone
equal to
(A) Activation energy
(B) Activation energy + normal
40. Parison programming is related to energy of reactants

(A) Injection molding (C) Normal energy of reactants

(B) Blow molding (D) Activation energy normal
energy of reactants
(C) Compression molding
(D) Rotational molding
44. A catalyst is a substance which
(A) Changes the equilibrium
41. For precition molded parts
constant of the reaction
technique is preferred.
(B) Supplies energy to the reaction
(A) Transfer molding
(C) Increases the equilibrium
(B) Compression molding
concentration of the product
(C) Injection molding
(D) Shorten the time to reach
(D) Calendering equilibrium

PO 9 A-1

45. The molecularity of a reaction is 48. Which of the following statement is
always not true with respect to Nylon 6,6 ?

(A) Whole number (A) Obtained from condensation

(B) Fraction (B) Sensitive to moisture

(C) Negative value (C) Chemically inert and flame

(D) Zero retardant

(D) Fiber forming polymer

46. polymer is used to make hot
water bags. 49. Polymers below T behaves like

(A) Poly styrene
(A) Hard and tough

(B) Poly methyl methacrylate
(B) Soti and flexible
(C) Natural rubber
(C) Hard and brittle
(D) Poly tetratluoro ethylene
(D) Soft and tough

47. Poly dispersity index of polymer is the
50. are used to preserve
ratio of
monomers.
(A) MM
(A) Initiator

(B) „./ ,7\A
(B) Chain transfer agents

(C) M (C) Inhibitors

(D) M,/M„ (D) Short stops

A-1 10 PO

PART — 2
Each question carries two marks. (25 x 2 = 50)

51. The pressure in meters of oil (specific 53. The stress-strain relation of the
gravity — 0.85) equivalent to 42.5 m of
Newtoneon fluid is,
water is,
(A) Linear
(A) 42.5 m
(B) Parabolic
(B) 50 m

(C) Hyperbolic.
(C) 52.5 m

(D) Inverse type
(D) 85 m

54. Pressure in Pascals at a depth of lm
52. In case the velocity vector at different
below the free surface of a body of
points- along a stream line remains
water will be equal to,
unchanged, then the flow is termed as;

(A) (A) 1 Pa
Stoke's flow

(B) Uniform flow (B) 98.1 Pa

(C) Rotational flow (C) 981 Pa

(D) 'notational flow (D) 9810 Pa

PO 11 A-1

55. In reversible isothermal expansion of 58. Two modes of mass transfer in fluids
an ideal gas are

(A) AU = Q (A) Conduction and convection

(B) Q=W
(B) Diffusion and convection
(C) AU = PAV
(C) Convection and radiation
(D) AU Q PAV
(D) Diffusion and radiation

56. C is
P
59. The equivalent thermal conductivity of
(A) Always greater than Cv
the wall as shown in the figure below
(B) Equal to Cv
is

(C) Less than
k,

(D) Never be less than Cv
I 1 = 12

+k,
57. The temperature at which the Joule — (A)
Thomson coefficient changes sign is
known as, klk2
(B)
+1(-)
(A) Critical temperature

(B) Inversion temperature 21(11:1
(C)
k1 +
(C) Condensation temperature

(D) Liquefaction temperature (D) Vk i ki

A-1 12 PO

60. A flat plate has thickness 5 cm, 62. If a solution contains 50 kg of

thermal conductivity lw/m°k, component 'A' and 100 kg of

convective heat transfer coefficients component `B', what is the average

on its two flat faces of 10 w/m2k and molecular weight of solution. If

20 v/m2 k. The overall heat transfer molecular weight of A is 10 and that

coefficient for such a flat plate is of B is 20 ?

(A) 5 wim2k (A) 15

(B) 6.33 w/m2 k (B) 150

(C) 20 w/m2k (C) 100

(D) 9.26 vim--k (D) 200

61. A solution contains 5 kg of water and 63. Which of the following is an example

5 kg of HC/, what is the weight for ring opening and condensation

fraction of water polymerization ?

(A) 0.5 (A) Nylon 6 and PE

(B) 0.05 (B) PET and PS

(C) 5 (C) Nylon 6,6 and PVC

(D) 50 (D) Nylon 6 and Nylon 6,6

PO 13 A-1

64. The group of polymers consisting of 67. Increase in the number of aromatic
SBR, EPDM, SAN, ABS and NBR arc groups along the backbone of the
best categorized as polymer chains

(A) Thermoplastics (A) Increases the flexibility and Tn,

(B) Elastomers (B) Increases the rigidity and Tm

(C) Copolymers
(C) Increases the hardness and
(D) Thermosets reduces the Ti„

Reduces .the rigidity and

65. Which of the following is amorphous increases the Ti„
and transparent engineering plastics

(A) PMMA
68. Mark-Houwink equation is related to
(B) PTFE
(A) Crystallinity
(C) Polycarbonate
(B) Elasticity
'(D) ABS
(C) Viscosity

(D) Electrical property
66. The group of polymers consisting of
chitosan, sodium alginate, cellulose,
gelatin and gangum are best 69. Epoxy, group, co-prolactum and
categorized as lactide are the examples for

(A) Thermoplastics (A) Condensation polymerization

(B) Monomersioligomers (B) Addition polymerization

(C) Thermosets (C) Co-ordination polymerization

(D) Natural polymers (D) Ring-opening polymerization

A-1 14 PO

70. In which of the following polymers 73. Which of the following are examples
hydrogen band present '? for inhibitors '?

(A) Cellulose and nylons (A) Hydroquinone & dinitrobenzene

(B) Cellulose nitrate and chitosan (B) Hydroquinone & benzoyl
peroxide
(C) Nylons and PTFE
(C) Benzoyl peroxide & ammonium
(D) Cellulose and polyacrylics
persulfate

(D) A/C/, & dinitrobenzene
71. If poly butadiene has degree of
polymerization of 1000, what is its
molecular weight ? 74. DSC and DMA can be used to

(A) 20,000 measure

(B) 10,000 (A) Thermal behaviours

(C) 54,000 (B) Tensile behaviours

(D) 27,000 (C) Morphological behaviours

(D) Structural behaviours

72. At any time when the chain
polymerization progress, the reaction 75. The odd polymer in the following
vessel contains combination, PP / PVC / PET / NR /

(A) Only monomers Nylon 6 / PC / PMMA is,

(B) Monomer Polymer (A) PP

Oligomers (B) Nylon 6

(C) Monomers + Solvents (C) PMMA

(D) Only polymers (D) NR

PO 15 A-1

A-1 16 PO