| Post Name | Tradesman (Polymer Technology) - Technical Education |
|---|---|
| Question Paper Code | 084/2023/OL |
| Category Code | 760/2021 |
| Date of Test | 15 June 2023 |
| Medium of Question | KANNADA |
| Exam Type | Online Examination |
| Total Questions | 100 |
1
Who is known as the "Father of Modern Polymer Science"?
Answer
B. Hermann Staudinger
2
Monomers used in addition polymerization is
Answer
B. Unsaturated compounds
3
Polyester ļ¬bre are prepared by
Answer
A. Melt spinning
4
Functionality of Adipic acid is
Answer
B. Two
5
Which polymer is used in bullet-proof vests?
Answer
D. Kevlar
6
Which of the following polymers can be synthesized by ring opening polymerization?
Answer
A. Nylon 6
7
Which protein plays a role in the latex coagulation mechanism by bridging between rubber particles?
Answer
B. Hevein
8
Identify the component which has the maximum composition in the Hevea rubber latex?
Answer
D. Water
9
In the production of PLC, yellow pigments can be destroyed by
Answer
C. Fractional coagulation
10
The concentration of Ammonia used for preserving ļ¬eld latex is
Answer
D. 1% by weight on latex
11
Which among the tapping system is adopted one or two years before replanting or replacing crop?
Answer
B. Slaughter tapping
12
Natural rubber latex can be coagulated using
Answer
B. Formic acid
13
Glass transition temperature of Natural Rubber is
Answer
C. ā70Ā°C
14
Surgical gloves are manufactured by
Answer
A. Dipping
15
Parthenium Argentatum is commonly known as
Answer
A. Gauyule rubber
16
Electro decantation is related with
Answer
D. Concentration of latex
17
Linear low density polyethylene is a copolymer of ethylene and a small fraction of _______.
Answer
A. Butene
18
In Lassaigne's test for the detection of halogens, the sodium fusion extract is ļ¬rst boiled with concentrated nitric acid. This is performed to
Answer
C. Decompose and
19
Which of the following ļ¬bre is known as "Dacron"?
Answer
A. Polyester
20
Resole is an example for
Answer
B. Thermosetting polymer
21
Which of the following is a thermoplastic polymer?
Answer
A. PVC
22
The catalyst used in the polymerization of propylene is
Answer
B. TiClā + Al(CāHā
)ā
23
The term "Tenacity" is associated with
Answer
D. Fibre
24
Which of the following grade of polystyrene is well suited for the purpose of insulating applications?
Answer
A. Expandable
25
An example for dienes used in the manufacture of EPDM is
Answer
D. All the above mentioned
26
Identify the monomers of butyl rubber.
Answer
A. Isoprene and Isobutylene
27
Which is an inorganic polymer?
Answer
C. Silicone rubber
28
Chloroprene rubber is vulcanized using
Answer
A. Metal oxide
29
The synthetic rubber used in the inner tubes of tyre is
Answer
C. IIR
30
Higher acrylonitrile content in NBR leads to
Answer
D. All the above mentioned
31
An example for a homopolymer is
Answer
A. Polybutadiene rubber
32
Buna N is a copolymer of ______ and ______.
Answer
B. Acrylonitrile and Butadiene
33
Ribbed Smoked sheets are graded according to the standards as per
Answer
B. IS 15361 : 2003
34
DIN Abrader is used to measure
Answer
C. Abrasion resistance
35
ASTM D412 standard deļ¬nes procedures used to evaluate _______ properties of vulcanized thermoset rubber and thermoplastic elastomers.
Answer
B. Tensile
36
______ indicates the resistance of raw rubber to deterioration during processing or aging.
Answer
B. PRI
37
Hardness is measured using
Answer
A. Durometer
38
In tensile testing, the standard rate of grip separation in rubbers is
Answer
C. 500 Ā± 50 mm/min
39
The percentage of dirt in ISNR 5 is
Answer
A. 0.05%
40
Which among the following parameter is considered for grading ISNR?
Answer
A. Dirt Content
41
As per ASTM D395 for the determination of compression set under constant force in air, a force of _______ is applied to the specimen for a set time at a set temperature.
Answer
A. 1.8 kN
42
ISNR grade which doesn't show storage hardness
Answer
D. ISNR-3 CV
43
Higher VFA number in a natural rubber latex indicates
Answer
A. Loss of colloidal stability
44
Viscosity of latex is measured using
Answer
B. Brookļ¬eld Viscometer
45
Magnesium content of latex is estimated by direct titration with ______ using Erichrome Black T as indicator.
Answer
C. 0.005 M EDTA Solution
46
As per IS 5430 - 1981, the maximum permissible value for Coagulum content for preserved natural rubber latices is
Answer
D. 0.05% by mass of latex
47
Water soluble ingredients can be added into latex as _______.
Answer
B. Solutions
48
Dispersions can be prepared using
Answer
D. All the above mentioned
49
TMTD is added into the latex as ________.
Answer
B. Dispersion
50
Identify the creaming agent used for concentrating latex
Answer
A. Tamarind seed powder
51
KOH is added to the latex compound as
Answer
D. None of the above mentioned
52
Dry rubber content of ļ¬eld latex can be measured roughly using
Answer
A. Metrolac meter
53
Which is used for the proper alignment of the nozzle and mold of the injection molding machine?
Answer
C. Register ring
54
Which type of cooling system provides the most eļ¬cient heat exchange in the calendaring process?
Answer
D. Peripherally drilled rolls
55
What is the compression ratio of a cold feed extruder?
Answer
B. 2.5:1
56
What type of compression mold is most suitable for extremely soft and hard compounds?
Answer
C. Positive
57
The eļ¬ciency of a machine is deļ¬ned as the ratio of the output work produced by the machine to _______.
Answer
B. energy consumed
58
Which is the corrective maintenance of a machine?
Answer
D. Disassembling parts and replacing a worn component.
59
Which device is used for constant temperature maintenance?
Answer
C. Thermostat
60
Which molding method is used for making carbonated beverage bottles?
Answer
C. Stretch blow molding
61
The ratio of the die cross-section and extrudate cross-section is termed as _______.
Answer
C. Dieswell
62
Some rubber processing machines are given below, which one has interlocking rotors and rotates at the same speed.
Answer
C. Intermix
63
Which FRP process is most suitable for chemical storage tank manufacturing?
Answer
A. Centrifugal Casting
64
Which is the open method of FRP manufacturing?
Answer
A. Pultrusion
65
Which standard system is used for the identiļ¬cation of the hazard material for emergency response?
Answer
B. NFPA 704
66
The chemicals, which produce suļ¬ocation from lack of oxygen are known as ______.
Answer
C. Asphyxiants
67
LD 50 and LC 50 are the measurements of _______.
Answer
B. toxicity
68
Which rubber-to-metal bonding system is most suitable for large rubber roller manufacturing?
Answer
B. Ebonite bonding
69
Estimations done by standard iodine solutions are called _______.
Answer
B. Iodimetry
70
What is the meaning of this chemical hazard symbol?
Answer
C. Oxidizable liquid
71
Which indicator should be used for complexometric titrations?
Answer
C. Eriochrome black T
72
Which intermediate solution is used in iodometry for the estimation of potassium dichromate?
Answer
B. Sodium thiosulphate
73
The hardness of water is expressed in ______.
Answer
C. Degrees
74
Which of the following solution should be used for eye bathing, when acids get in the eyes at the laboratory?
Answer
C. 2%
75
Solutions of a weak acid and its conjugate base or weak base and its conjugate acid can maintain pH is known as _______.
Answer
D. Buļ¬er
76
How do you make o.1N aqueous solution?
Answer
C. 4 gm in 1000 ml water
77
Which of the given parameter value increases with the magnesium content?
Answer
D. Sludge content
78
Hearing protection is required when noise levels exceed OSHA's PEL of _____ dBA.
Answer
B. 90
79
Which equipment is used in the determination of the KOH Number of latex?
Answer
C. pH meter
80
Which of the following chemical is used as a coagulating agent in the VFA number determination of latex?
Answer
B. 30% Ammonium sulfate
81
What is the function of an Electrostatic precipitator in industries?
Answer
D. Device for pollution control
82
Which of the following is most considered for approved eye protection in labs?
Answer
D. Goggle glass meeting ANSI standard Z87
83
Which is calculated as the percentage of the specimen's permanent deformation to its original thickness?
Answer
B. Compression set under a constant force
84
The hazard rating diamond of a chemical label is marked 3 in the blue zone. What does this mean?
Answer
D. The chemical is a serious health hazard
85
Which part of analytical balance is directly linked with central agate?
Answer
D. Lever
86
If the rider is placed at the small division from the center of the beam on the right side, then the eļ¬ective mass due to the rider is _______.
Answer
A. 2 mg
87
What is the ļ¬rst remedy for bromine burn accidents in the laboratory?
Answer
B. Wash with petrol and apply olive oil
88
Which laboratory ļ¬ask is used for Vacuum ļ¬ltration?
Answer
C. Buchner ļ¬ask
89
The ļ¬lled volume of an internal mixer = ________.
Answer
B. Net chamber volume*Fill factor
90
Which curing system is suitable for the epoxy resin to obtain high alkali resistance?
Answer
C. Amine
91
What is the function of styrene in UP-resin compounding?
Answer
C. Diluent of UP resin
92
Which catalyst is used for elevated temperature of curing of UP resin?
Answer
D. Benzoyl peroxide
93
Which promotes good adhesion between ļ¬brous reinforcement and resin matrix?
Answer
C. Vinyl trichlorosilane
94
Which is used as a UV stabilizer?
Answer
C. Benzotriazole
95
Which ingredient increases the tinctorial power and fastness to light of rubber product?
Answer
C. Titanium dioxide
96
Which is used as a co-agent in peroxide curing of rubber?
Answer
B. Try allyl isocyanurate
97
What is the function of ethylene thio urea in Chloroprene rubber compounding?
Answer
B. Accelerator
98
Which type of carbon black increases the conductivity of rubber compounds?
Answer
A. Acetylene black
99
Which is the most suitable reinforcing ļ¬ller for ļ¬uorocarbon rubbers?
Answer
C. Medium thermal black
100
Which curing system is suitable for saturated rubbers for high- temperature resistance?
Answer
C. Peroxide
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