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Test: Plastics, Ceramics & Composite Materials - 3 - Mechanical Engineering MCQ


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30 Questions MCQ Test Topicwise Question Bank for Mechanical Engineering - Test: Plastics, Ceramics & Composite Materials - 3

Test: Plastics, Ceramics & Composite Materials - 3 for Mechanical Engineering 2024 is part of Topicwise Question Bank for Mechanical Engineering preparation. The Test: Plastics, Ceramics & Composite Materials - 3 questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: Plastics, Ceramics & Composite Materials - 3 MCQs are made for Mechanical Engineering 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Plastics, Ceramics & Composite Materials - 3 below.
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Test: Plastics, Ceramics & Composite Materials - 3 - Question 1

Which of the following materials is used for car tyres as a standard material?

Test: Plastics, Ceramics & Composite Materials - 3 - Question 2

Weldable type plastic(s) include(s):

Detailed Solution for Test: Plastics, Ceramics & Composite Materials - 3 - Question 2

Weldable plastics are: Polypropylene, Polycarbonate, Acrylic, Nylon, ABS.

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Test: Plastics, Ceramics & Composite Materials - 3 - Question 3

The windows of aeroplane are made of

Test: Plastics, Ceramics & Composite Materials - 3 - Question 4

Which one is not a characteristics of plastics?

Test: Plastics, Ceramics & Composite Materials - 3 - Question 5

Plasticizers are added in plastic to

Test: Plastics, Ceramics & Composite Materials - 3 - Question 6

Whiskers are

Detailed Solution for Test: Plastics, Ceramics & Composite Materials - 3 - Question 6

Whiskers are very thin filaments, hair-like single crystals of about 13 mm length and 10-4 cm diameter (approx). These are produced as dislocations of free - crystals and are without any structural defect. Whiskers are far stronger than polycrystals of same materials.

Test: Plastics, Ceramics & Composite Materials - 3 - Question 7

The cermets are example of

Test: Plastics, Ceramics & Composite Materials - 3 - Question 8

A continuous and aligned glass fibre-reinforced composite consists of 40 vol% of glass fibres modulus of elasticity 69 GPa and 60 vol% of a polyester resin that, when-hardened, displays a modulus of 3.4 GPa. What is the modulus of elasticity of this composite in the longitudinal direction?

Detailed Solution for Test: Plastics, Ceramics & Composite Materials - 3 - Question 8

ECL = Em Vm + Ef Vf = 3.4 x 0.6 + 69 x 0.4
= 2.04 + 27.6  = 30 GPa

Test: Plastics, Ceramics & Composite Materials - 3 - Question 9

A continuous and aligned glass fibre-reinforced composite consists of 40 vol% of glass fibres having a modulus of elasticity 80 GPa and remaining volume of a polyester resin that, when hardened, displays a modulus of 4 GPa. What is the elastic modulus of composite material when the stress is applied perpendicular to the direction of fibre alignment?

Detailed Solution for Test: Plastics, Ceramics & Composite Materials - 3 - Question 9


Test: Plastics, Ceramics & Composite Materials - 3 - Question 10

The matrix phase of fibrous composites may be

Test: Plastics, Ceramics & Composite Materials - 3 - Question 11

Which of the following is not an example of laminar composite?

Detailed Solution for Test: Plastics, Ceramics & Composite Materials - 3 - Question 11

When multidirectional stresses are imposed within a single plane, a ligned layers that are fastened together one on top of another at different orientations are frequently utilized. These are called laminar composites. These are generally designed to provide high strength and low cost at a lighter weight.

Test: Plastics, Ceramics & Composite Materials - 3 - Question 12

Wood is

Detailed Solution for Test: Plastics, Ceramics & Composite Materials - 3 - Question 12

Wood is a natural polymer composite with principal polymeric molecules being those of cellulose. It is composed of cells resembling long tubes with tapered ends.

Test: Plastics, Ceramics & Composite Materials - 3 - Question 13

Ceramic cutting tools are made of

Test: Plastics, Ceramics & Composite Materials - 3 - Question 14

Silica is

Test: Plastics, Ceramics & Composite Materials - 3 - Question 15

Which one of the following materials is not a composite?

Test: Plastics, Ceramics & Composite Materials - 3 - Question 16

Consider the following statements regarding composite materials:
1. Material is termed as advanced composite if fibres are directionally oriented and continuous.
2. Reinforced fibres glass products are strong and light weight,
3. Concrete is reinforced with steel bars and the bar becomes matrix.
4. Pearlitic steels are composites.
Q. Which of the above statements are true?

Test: Plastics, Ceramics & Composite Materials - 3 - Question 17

Polythene is

Test: Plastics, Ceramics & Composite Materials - 3 - Question 18

Consider the following statements pertaining to composite materials:
1. The mechanical characteristics of a fibre-reinforced composite depend only on the properties of the fibre.
2. Prestressed concrete should be of a high quality with a low shrinkage and a low creep rate.
3. Whiskers are very thin single crystals that have extremely large length-to-diameter ratio.
Q. Which of the above statements are valid?

Detailed Solution for Test: Plastics, Ceramics & Composite Materials - 3 - Question 18

The mechanical characteristics of a fiber-reinforced composite depend not only on the properties of the fiber, but also on the degree to which an applied load is transmitted to the fibers by the matrix phase.

Test: Plastics, Ceramics & Composite Materials - 3 - Question 19

Slow and progressive deformation of a material with time under constant stress is called creep.This phenomenon is not exhibited at low temperature by

Test: Plastics, Ceramics & Composite Materials - 3 - Question 20

Select the wrong statement:

Test: Plastics, Ceramics & Composite Materials - 3 - Question 21

Viscoelastic behaviour would be exhibited by

Test: Plastics, Ceramics & Composite Materials - 3 - Question 22

Dextrin is

Test: Plastics, Ceramics & Composite Materials - 3 - Question 23

Consider the following statements:
Thermosetting plastics are
1. Formed by addition polymerization
2. Formed by condensation polymerization
3. Softened on heating and hardened on cooling
4. Moulded by heating and cooling
Q. Which of these statements are true?

Test: Plastics, Ceramics & Composite Materials - 3 - Question 24

Teflon is a

Test: Plastics, Ceramics & Composite Materials - 3 - Question 25

Phenol formaldehyde is a

Test: Plastics, Ceramics & Composite Materials - 3 - Question 26

Structure of a polymer is

Test: Plastics, Ceramics & Composite Materials - 3 - Question 27

Polyesters can be defined as the condensation products of

Test: Plastics, Ceramics & Composite Materials - 3 - Question 28

Match List-I (Materia!) with List-II (Typical use) and select the correct answer using the codes given below the isits:
List - I
A. Branched polyethylene
B. Polyester
C. Polyvinyl chloride
D. Linear Polyethylene
List - II
1. Bottles
2. Textile fibres
3. Films forpackaging
4. Transparent Film

Codes:
      A B C D
(a)  3 2 1  4
(b)  2 3 4  1
(c)  2 3 1  4
(d)  3 2 4  1

Test: Plastics, Ceramics & Composite Materials - 3 - Question 29

Match List-I with List-II and select the correct answer using the codes given below the lists:
List-I
A. Neoprene
B. Bakelite
C. Foamed poly-urethane
D. Araidite
List-II
1. Electric switches
2. Adhesive
3. Thermal insulator
4. Oil seal
Codes:
     A B C D
(a) 4 1 2 3
(b) 1 4 2 3
(c) 4 1 3 2
(d) 1 4 3 2

Detailed Solution for Test: Plastics, Ceramics & Composite Materials - 3 - Question 29

(i) Neoprenes are used as wire and cable, chemical tank linings, belts, hoses, seals and gaskets. It has excellent heat and weathering resistance and also good oil resistance.
(ii) Bakellte has excellent thermal stability to over 150°C and may be compounded with a large number of resins, fillers.
It is used in motor housing, telephones, auto distributor and electrical fixtures.
(iii) Foamed Polyurethane are commonly used as cushions in auto mobiles and furniture as well as in packaging and thermal insulation.
(iv) Araldite has excellent combination of mechanical properties and corrosion resistance, dimensionally stable, good adhesion, relatively inexpensive and good electrical properties.

Test: Plastics, Ceramics & Composite Materials - 3 - Question 30

The molecular weight of vinyl chloride is 62.5. Thus the molecular weight of a polyvinyl chloride with a degree of polymerization of 20000 is

Detailed Solution for Test: Plastics, Ceramics & Composite Materials - 3 - Question 30


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