| Post Name | Workshop Instructor/ Instructor Grade II/ Demonstrator/ Draftsman Grade II in Polymer Technology - Technical Education |
|---|---|
| Question Paper Code | 099/2023/OL |
| Category Code | 675/2022 |
| Date of Test | 30 June 2023 |
| Exam Type | Online Examination |
| Total Questions | 100 |
1
Answer the following polymers which is of natural origin (i) Silk (ii) Shellac (iii) Wool (iv) Nylon
Answer
C. only (i), (ii) and (iii)
2
Which of the following is a crystalline polymer (i) Polyethylene (ii) Polystyrene (iii) Nylon (iv) Polyvinylchloride (v) All of the above
Answer
B. only (i) and (iii)
3
Which of the following polymerising technique is extensively employed for the polymerisation of isoprene?
Answer
B. Solution polymerisation
4
Which of the following is a condensation polymer? (i) Cellulose (ii) PMMA (iii) Kevlar (iv) Dacron
Answer
B. Only (i), (iii) and (iv)
5
What is the functionality of Vinyl Chloride?
Answer
B. Two
6
The size of a fibre is expressed in terms ____________
Answer
A. Denier
7
Who is known as the "Father of Modern Polymer Science"?
Answer
A. Hermann Staudinger
8
The polymerisation technique employed for the polymerisation of water insoluble monomers
Answer
D. Suspension Polymerisation
9
Which of the following is used as blowing agents in rubber compounds? (i) Sodium bicarbonate (ii) Ammonium bicarbonate (iii) DNPT (dinitroso pentamethylene tetramine) (iv) Titanium dioxide
Answer
C. only (i), (ii) and (iii)
10
Which among the following comes under the category of thermoplastic polymers? (i) Polystyrene (ii) Bakelite (iii) Nylons (iv) Polyvinyl chloride
Answer
C. Only (i), (iii) and (iv)
11
Natural rubber is _________
Answer
B. cis-1,4 polyisoprene
12
The angle of cut in a rubber tree for tapping of latex is
Answer
C. 25-30º to the horizontal
13
An example of yield stimulant for natural rubber latex is
Answer
B. 2-chloroethane phosphonic acid
14
Among the following which one is not a method for concentrating natural rubber latex?
Answer
D. coagulation
15
Cuplumps and tree lace are used for making __________
Answer
C. brown crepes
16
The dry-rubber content of raw natural rubber latex may be __________
Answer
D. 32%
17
__________ helps to prevent natural coagulation and allows the latex to remain in its liquid state for a long time.
Answer
A. Ammonia solution
18
Among the following which is not marketable form of natural rubber?
Answer
C. Field coagulum
19
The pH of fresh latex is in the range of _________
Answer
B. 6.5 - 7.0
20
Which chemical is not used for low-ammonia preservative systems?
Answer
C. Stearic acid
21
Among the following, which is not a co-polymer?
Answer
B. BR
22
The rubber which is not vulcanized by sulphur is _________
Answer
A. Neoprene
23
Which rubber has high gum tensile strength?
Answer
C. Natural rubber
24
Most commercial process for the preparation of polybutadiene employ __________
Answer
A. Solution polymerisation
25
Closed-cell extruded ____________ sponges are used in automotive weather stripping for doors and trunk lids.
Answer
D. EPDM
26
Isobutylene and isoprene are the monomers of __________
Answer
C. Butyl rubber
27
The most important property of nitrile rubber is __________
Answer
B. oil resistance
28
____________ is prominent among elastomers for adhesives because of its combination of polarity and crystallinity.
Answer
A. Neoprene
29
Because of the excellent radiation resistance, these rubbers are well- suited for wire and cable coverings in nuclear applications.
Answer
C. CSM
30
The monomers of polyurethane are
Answer
B. diisocyanate and diol
31
The materials in combination with vulcanising agents reduce the cure time are __________
Answer
C. accelerators
32
During mastication of rubber
Answer
A. viscosity decreases
33
Zinc oxide and stearic acid are added as ____________ in sulphur curing system.
Answer
D. Co-activators
34
Which is a chemical blowing agent?
Answer
A. Sodium bicarbonate
35
Which type of sulphur vulcanisation system provide resistance to thermal oxidation?
Answer
D. Efficient vulcanisation system
36
Among the following, which accelerator is used in room temperature vulcanisation?
Answer
B. Sodium isopropyl xanthate
37
Saturated rubbers are cross-linked by
Answer
C. Peroxide vulcanisation
38
The materials used to ensure scorch safety of the rubber compound
Answer
B. Retarders
39
The strong antidegradants which discolour and stain the material are __________
Answer
B. Amines
40
An example for chemical plasticizer is ___________
Answer
Question Cancelled
41
Addition of __________ increases hardness and modulus of the vulcanisate.
Answer
C. Reinforcing fillers
42
The chemical used to reduce the flammability of a vulcanisate
Answer
B. Antimony compounds
43
The initial tensile properties are better for a rubber vulcanisate with ___________
Answer
C. Polysulfidic linkages
44
An example of thickening agent used in latex compounding is _________
Answer
A. gelatine
45
Equipment used for the preparation of very fine and stable emulsions is ___________
Answer
C. homogeniser
46
The dipping process in which no destabilisation agent is used, is known as
Answer
A. Straight dipping
47
Which one is the indirect chemical used in the manufacture of gloves?
Answer
D. coagulant
48
The process that keeps the residual protein level of gloves to a minimum
Answer
B. Post leaching
49
The type of defect found in dipped goods because of the presence of bubbles in the coagulant tank.
Answer
A. Pin hole
50
Sodium silicofluoride in conjugation with zinc oxide is used in the Dunlop process as _________
Answer
C. gelling agent
51
Extrusion of latex compound is involved in the manufacture of ______________
Answer
A. Latex thread
52
The Talalay process is used for the manufacture of __________
Answer
B. Latex foam
53
According to BIS specification, maximum volatile matter content by mass permitted for ISNR grader is
Answer
C. 0.8%
54
Thickness of the specimen used for the determination of plasticity retention index are in the range of
Answer
A. 3.2 to 3.6 mm
55
In order to find ash content of a ISNR sample it should be heated (i) At 550ºC (ii) At 500ºC (iii) under nitrogen blanket (iv) in presence of oxygen
Answer
B. (i) and (iv)
56
Catalytic mixture used in the determination of nitrogen content of ISNR consist of (i) Selenium powder (ii) Ferrous sulphate (iii) Potassium sulphate (iv) Copper sulphate
Answer
C. (i), (iii) and (iv)
57
According to BIS specification test for determining dry rubber content, the TSC of the concentrated latex sample is adjusted to _________ before coagulating it.
Answer
A. 20%
58
Indicator used for the determination of the alkalinity of concentrated latex is
Answer
B. Methyl Red
59
KOH number of latex is the number of grams of potassium hydroxide equivalent to the radicals combined with ammonia in latex concentrate containing __________ g of total solids.
Answer
D. 100
60
Markham still apparatus is used for the determination of
Answer
C. VFA number
61
Indian standard which describe the specification tests of concentrated latex is
Answer
A. IS 3708
62
During MST testing, the speed of stirrer of apparatus is maintained at
Answer
A. 14,000 rev/min.
63
Which among the following is a thermosetting polymer?
Answer
A. Bakelite
64
Which process is used for the production of HDPE?
Answer
Question Cancelled
65
Type of polypropylene that cannot crystallize
Answer
C. Atactic
66
Glass transition temperature of PVC is
Answer
B. 80ºC
67
Tower process for the production of polystyrene is a
Answer
A. Bulk polymerization
68
PMMA produced by Bulk polymerization is difficult to melt process. Why?
Answer
A. Its molecular weight is high
69
During the polymerization of nylon 6,6, acetic acid is added in to the reaction system as a
Answer
A. Molecular weight modifier
70
Example for a hardener used for epoxy resin is
Answer
A. Diamino diphenyl methane
71
Which among the following is/are a continuous mixerls? (i) Two roll mill (ii) Twin screw extruder (iii) Banbury mixer (iv) MVX machine
Answer
C. (ii) and (iv)
72
Dispersive mixing is (i) Size reduction of the agglomerates of compounding ingredients (ii) Uniform distribution of compounding ingredients in rubber (iii) Achieving lower viscosity compound
Answer
A. (i) only
73
Which type of compression mold produce products with lower density?
Answer
Question Cancelled
74
In pot transfer molding, compound is transferred from pot to cavity through a vertical channel called
Answer
B. Sprue
75
In an injection molding machine with two plate mold, the maximum distance between the stationery and moving platen is called
Answer
A. Day light
76
The angle formed between the flight and the plane normal to the screw axis in an extruder is
Answer
A. Helix angle
77
In extrusion blow molding the ratio of the final tube diameter to original die diameter is known as
Answer
B. Blown up ratio
78
Perison programming in extrusion blow molding is
Answer
B. Adjusting the die to get different wall thickness for parison
79
Among the polymers given below which polymer is used in reaction injection molded products.
Answer
B. Polyurethane
80
L/O ratio 5 can be used for
Answer
Question Cancelled
81
Which among the following is produced by thermoforming?
Answer
A. Blistering packaging
82
PET Bottles are manufactured by
Answer
B. Stretch blow molding
83
If the mooney viscosity value of a rubber sample is 50-UML 1+4 (100ºC) the value 1 represents
Answer
B. Preheating time
84
In cure characteristics study by ODR with 3° oscillating amplitude, scorch time is represented as
Answer
Question Cancelled
85
Tensile strength is calculated by dividing the _____________ by the average original cross-sectional area.
Answer
B. Maximum load
86
Which among the following is a unit of tear strength?
Answer
B. kN/m
87
Durometer is used to measure
Answer
A. Hardness
88
In an abrasion resistance test using DIN abrader, the volume loss of standard rubber in cubic millimeters is V_s and volume loss of test rubber in cubic millimeters is V_t
Answer
Question Cancelled
89
In a compression set test at constant strain, the original thickness of specimen = 12.5mm. Final thickness of specimen = 12.2 mm and thickness of the space bar used = 9.5 mm. Find the compression set of specimen.
Answer
B. 10%
90
Vicat softening temperature is the temperature at which the specimen is penetrated to a depth of ____________ by a flat ended needle with a cross section.
Answer
A. 1mm
91
Which apparatus is used for the determination of melting point?
Answer
C. Fisher Johns apparatus
92
Which among the following statements is correct about MFI? (i) MFI is temperature dependent (ii) MFI is directly proportional to molecular weight (iii) MFI is inversely proportional to molecular weight
Answer
D. (i) and (iii)
93
Specified rim diameter of a cylce tyre is rounded off to the nearest whole number to get
Answer
A. Nominal rim diameter
94
Cord strength of cycle tyre is tested in accordance with
Answer
A. IS 4910
95
In accelerated ageing test of cycle tube, samples are subjected to an ageing condition of
Answer
B. 70 ± 1°C for 72 hours
96
Which among the following tests is not a specification test of cycle tube?
Answer
C. Casing strength
97
As per IS 10702 the length and breadth of split tear sample should be
Answer
B. 100 mm and 25 mm
98
In flexing test of latex foam sample is subjected to a continued flexing with an indentor for 250000 cycles at ____________ cycles per second.
Answer
C. 4
99
The load in kilograms required to give an indentation in the sample equivalent to 10 percentage of the original thickness of the latex foam sample under specified condition is known as
Answer
C. Indentation hardness
100
Hardness required for a hawai sole as per IS 10702 is
Answer
A. 45±5 Shore A
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