| Post Name | Lecturer in Polymer Technology (Polytechnics) - Technical Education |
|---|---|
| Question Paper Code | 120/2023/OL |
| Category Code | 398/2022 |
| Date of Test | 21 July 2023 |
| Exam Type | Online Examination |
| Total Questions | 100 |
1
Let A, B and X be three matrices such that A = BX. If A = [[1, 2], [4, −6]] and B = [[1, 0], [0, 2]], then X equals
Answer
A. [[1, 2], [2, −3]]
2
If a + b + c = 0, one root of det([[a − x, c, b], [c, b − x, a], [b, a, c − x]]) = 0 is
Answer
D. 0
3
The term independent of x in the expansion of is
Answer
C. 6th
4
The equation of the line that had y intercept 4 and is perpendicular to 3x+2y=7 is
Answer
B. 2x-3y+12=0
5
If , then the value of acos2x+2sin2x is
Answer
C. a
6
∫ x/(x⁴ + x² + 1) dx is equal to
Answer
B. (1/√3) tan⁻¹((2x² + 1)/√3) + c
7
If y = 4x − 5 is a tangent to the curve y² = px³ + q at (2, 3), then (p, q) =
Answer
D. (2,-7)
8
For the function f(x) = xeˣ, the point:
Answer
A. x=-1 is a point of minimum
9
The area of the region bounded by the curve y = 1 − |x| and the x-axis is:
Answer
C. 1
10
The solution of the differential equation dy/dx + 2y = e⁻²ˣ is
Answer
A. ye²ˣ = x + c
11
Two rubbers which are prepared by coordination polymerization are
Answer
Question Cancelled
12
The following is not a delayed action accelerator
Answer
D. DPG
13
A very convenient cure system for poly acrylate rubber is
Answer
D. Sulphur+soap
14
Banbury mixing is suitable for industries doing
Answer
A. Large volumes of limited number of compounds based on similar rubbers
15
Natural rubber is
Answer
B. Difficult to injection mould due to compounds with high viscosity and high scorch danger
16
Reclaimed rubber is useful because
Answer
C. It reduces cost, gives processing advantages and also improves ageing resistance for NR compounds besides solving pollution problem caused by littering of used tyres
17
____________ polymer is suitable for blow moulding
Answer
D. SBS
18
The life of an oil seal depends on _______ property
Answer
C. Compression set
19
For getting the faster cure rate in IIR
Answer
C. both of the above
20
CR is modified during polymerization to
Answer
A. Reduce its crystallization
21
The difficult in dispersing silica in diene rubbers is due to
Answer
Question Cancelled
22
Payne effect is studied using
Answer
A. Dynamic mechanical analysis
23
The first generation of solution SBR had
Answer
A. Blockiness
24
A non polar rubber which can surpass NR in all aspects is
Answer
Question Cancelled
25
Upside down mixing is done for
Answer
D. Rubbers which soften quickly during mixing
26
For easy transport and handling, carbon black is
Answer
B. Pelletised
27
ZnO+Steatic acid causes
Answer
Question Cancelled
28
The excellent tackiness of NR is due to
Answer
D. Both 1 and 2
29
The difficulty in dissolving cellulose in water, in spite of too many OH groups in it, is because of
Answer
C. Hydrogen bonding
30
If Tg of a polymer is close to ambient temperatures but melting point is high (i.e. more than 3/2 of its Tg), it means that the polymer is
Answer
D. crystalline and fibre
31
The difficulty in getting a fluorocarbon rubber based on homopolymers is due to
Answer
C. Crystallization tendency of the resulting polymer
32
Which rubber is prepared from another polymer?
Answer
C. CSM
33
A polymer which cannot be cross linked is
Answer
B. Poly isobutylene
34
Chlorination of Natural rubber involves
Answer
C. Electrophilic addition and cyclisation
35
When you get ethylene based rubbers, the resulting polymer gets a Tg above that of PE (assuming it to around -80C). This is because
Answer
A. rubberiness is achieved by breaking the crystallization of PE by adding bulky side chains
36
Apart from ageing resistance, anti oxidants may improve
Answer
A. Fatigue and abrasion resistance
37
High molecular weight in polymer chains lead to higher viscosity because of
Answer
B. More entanglements between chains above a critical molecular weight
38
Often, high temperature polymers will also be highly rigid because
Answer
B. They often have aromatic rings in the main chain (brydson, plastics materials p 584)
39
Among the following high temperature plastics _____________ has some crystallizing tendency
Answer
B. PEEK
40
Peroxide cured EPDM compounds are not suitable for microwave curing because
Answer
B. The bonds (including C-C cross links) in the rubbers do not produce dipole moments during vibration
41
In DSC, the ____________ is potted against temperature
Answer
D. Heat capacity Wunderlich B (1990). Thermal Analysis New York: Academic Press pp. 137-140. ISBN 0-12-765605-7
42
High strength carbon fibre is produced from
Answer
D. PAN
43
High modulus fibres can be prepared by
Answer
D. Gel spinning
44
The following method does not give molecular weight distribution
Answer
D. Osmometry
45
Rubber elasticity is driven by changes in
Answer
A. Entropy
46
A rubber is ____________ polymer
Answer
B. Amorphous but may crystallize on straining
47
Rubber used for IB cap
Answer
B. Natural Rubber
48
Inorganic blowing agents release
Answer
A. Carbon dioxide
49
The rubber used in tyre innreliner
Answer
C. Bromo butyl Rubber
50
Metal oxide crosslinking used in
Answer
B. Chloroprene Rubbers
51
Flat spotting of the tyre occurs in
Answer
D. Nylon chords
52
Upside down mixing is associated with
Answer
Question Cancelled
53
Neutral angle for hose manufacturing
Answer
A. 54º44'
54
Conveyor belt crosslinked by
Answer
C. Both
55
Hildebrand is the unit of
Answer
C. Solubility parameter
56
Resilience is inversely related to
Answer
A. Heat build up
57
The major metal present in sludge removed from latex is
Answer
C. Mg
58
What is the use of Potassium oleate in natural rubber latex foam?
Answer
D. Foam promoter
59
Which is used as an anti-coagulating agent
Answer
D. All of the above
60
Which type of wheels is preferred for sports cars
Answer
C. Magnesium wheel
61
What do the permissible of mixing cross ply and radial ply automibile tyres allow?
Answer
C. Cross ply tyres on front wheels
62
What is GRS?
Answer
B. Styrene butadiene rubber
63
Electrodeposition process related to which product?
Answer
C. Gloves
64
Material used in tyre-cord adhesive is
Answer
A. Styrene-vinylpyridine-butadiene terpolymer latices
65
Which of the following are examples of natural fibers? (i) Nylon (ii) Jute (iii) Polyester (iv) Sisal
Answer
B. (ii) and (iv)
66
What is the most widely used man-made fiber?
Answer
A. Polyester
67
A common matrix material used in FRP is
Answer
C. Epoxy resin
68
The dispersed phase in common fiber reinforced plastic is
Answer
A. Glass fiber
69
Melting point is the characteristics of
Answer
B. Crystalline polymers
70
Dibutyl phalate, Tricresyl phosphate are all example of
Answer
B. Plasticizer
71
Name a self-extinguishing thermoplastic material
Answer
C. PVC
72
Which one of the following materials is used for making CD?
Answer
D. PC
73
High temperature, high performance polymeric materials are called ___________ polymers
Answer
C. Specialty
74
Which one of the following is a natural polymer?
Answer
A. Shellac
75
Phenol and formaldehyde molar ration for resol synthesis is ______________ under basic medium
Answer
C. 1:1.5
76
One of the important joining techniques used for thermoplastic and will produce a permanently bonded and aesthetically pleasing joint
Answer
D. Ultrasonic welding
77
Which of the following could be made from HDPE
Answer
D. All of these
78
Processing temperature of PP for below moulding
Answer
Question Cancelled
79
For pipe application PVC is manufactured by _____________ polymerization
Answer
Question Cancelled
80
Natural polyol used for the production of polyurethane foam
Answer
A. Castor oil
81
Which of the following is amino plastic?
Answer
C. UF
82
PPO can be used in steam autoclave because of its
Answer
A. High hydrolytic stability
83
A major disadvantage of mill mixing as compared to internal mixer is
Answer
A. It is time consuming and depends upon the skill of the operator
84
From the point of view of ingredients, the following physical changes occur during a mixing cycle
Answer
B. Incorporation, dispersion, distribution and plasticization
85
Increase in the rotor speed of an internal mixer will result in
Answer
A. Increase in the temperature of cooling water
86
To measure the stock temperature inside a Banbury mixer, the device used is
Answer
C. A thermocouple
87
Crows feet is related to ____________ process
Answer
D. Calendaring
88
Frictioning in a calendar involves
Answer
C. Forcing the rubber into the interstices between fibers of a fabric through wiping with roll pressure between the middle and bottom rolls
89
To produce thick rubber sheeting, it is preferable to use
Answer
D. An extruder with roller head
90
Continuous vulcanization of an extruded sponge profile can be done by
Answer
B. Microwave curing
91
Which of the following curing technique has highest heat transfer coefficient?
Answer
D. Liquid curing method
92
The usual formula for calculation of tensile strength of rubber compound is
Answer
C. Breaking load/original cross sectional area of the sample
93
Troughability test is required in
Answer
D. Conveyor belt
94
_______ and _______ monomers are used in reactions injection molding process
Answer
C. Diisocyanate and polyol
95
Aniline point testing method is used for
Answer
D. Process oil
96
The most common standard conditioning atmosphere is
Answer
A. 23°C and 50% relative humidity
97
The crosshead speed/strain rate used to for tensile testing of brittle materials like polystyrene is
Answer
Question Cancelled
98
In HDT test, a deadweight load is applied at the center of the specimen which is sufficient to produce a maximum fiber stress of
Answer
B. 264 psi
99
____________ is used to measure the curing characteristics of the rubber compounds
Answer
Question Cancelled
100
Which property is more important for seals
Answer
C. Stress relaxation
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