Plastics And Use Of Materials - MCQ Test 2


30 Questions MCQ Test Mock Test Series - Mechanical Engineering (ME) for GATE 2020 | Plastics And Use Of Materials - MCQ Test 2


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This mock test of Plastics And Use Of Materials - MCQ Test 2 for Mechanical Engineering helps you for every Mechanical Engineering entrance exam. This contains 30 Multiple Choice Questions for Mechanical Engineering Plastics And Use Of Materials - MCQ Test 2 (mcq) to study with solutions a complete question bank. The solved questions answers in this Plastics And Use Of Materials - MCQ Test 2 quiz give you a good mix of easy questions and tough questions. Mechanical Engineering students definitely take this Plastics And Use Of Materials - MCQ Test 2 exercise for a better result in the exam. You can find other Plastics And Use Of Materials - MCQ Test 2 extra questions, long questions & short questions for Mechanical Engineering on EduRev as well by searching above.
QUESTION: 1

Which of the following statement is incorrect about duralumin? 

Solution:

Ans. (c)

QUESTION: 2

Assertion (A): Linear polymers are rigid at low temperatures but soft andmouldable at elevated temperatures.  
Reason (R): Linear polymers are thermo-setting.

Solution:

Ans. (c) A is true but R is false

QUESTION: 3

Tin base white metals are used where the bearings are subjected to

Solution:

Ans. (d)

QUESTION: 4

Match List I with List II and select the correct answer using the code given below the Lists:  
List I                                                    List II
(Material)                                        (Application)
A. Fibre reinforced plastics           1. Automobile tyres
B. Acrylics                                     2. Aircraft
C. Phenolics                                 3. Lenses
D. Butadiene rubber                     4. Electric switch cover
Code: A B C D                   A B C D
      (a) 1 4 3 2               (b) 2 3 4 1
      (c) 1 3 4 2               (d) 2 4 3 1

Solution:

Ans. (b)

QUESTION: 5

Which material is used for bushes in the bushed-pin type of flexible coupling?

Solution:

Ans. (c) Rubber is used for bushes in the bushed pin type flexible coupling.

QUESTION: 6

Thermoplastic materials cannot be produced by: 

Solution:

Ans. (b) For thermoplastic extrusion we have to feed thermoplastic pellets or powders through a hoper into a barrel chamber of a screw extruder. So it is not conventional extrusion process.

QUESTION: 7

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

Solution:

Ans. (a)

QUESTION: 8

Consider the following statements: 
Polytetrafluoroethene is
1. A thermoplastic material
2. Having high friction coefficient
3. A thermosetting material
4. Having low friction coefficient
5. An electric insulator
6. Non sticking to surfaces
Which of the above statements are correct?

Solution:

Ans. (a)

QUESTION: 9

Why are babbit alloys used for bearing material?  

Solution:

Ans. (a) A tin base alloy containing 88% tin, 8% antimony and 4% copper is called babbit metal. It is a soft material with a low coefficient of friction and has little strength. It is the most common bearing metal used with cast iron boxes where the bearings are subjected to high pressure and load. A babbit overlay to enhance surface conformability and corrosion resistance, makes an excellent bearing.

QUESTION: 10

Babbit lining is used on brass/bronze bearings to  

Solution:

Ans. (c)

QUESTION: 11

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

Solution:
QUESTION: 12

Which one of the following is correct? 
Babbitt are used for

Solution:

Ans. (b) A tin base alloy containing 88% tin, 8% antimony and 4% copper is called babbit metal. It is a soft material with a low coefficient of friction and has little strength. It is the most common bearing metal used with cast iron boxes where the bearings are subjected to high pressure and load.

Note: Those alloys in which lead and tin are predominating are designated as white metal bearing alloys. This alloy is used for lining bearings subjected to high speeds like the bearings of aero-engines.

QUESTION: 13

Consider the following statements:Fibre Reinforced Plastics are
1. Made of thermosetting resins and glass fibre
2. Made of thermoplastic resins and glass fibre
3. Anisotropic
4. isotropic
Select the correct answer using the codes given below:

Solution:

Ans. (b)

QUESTION: 14

Gunmetal, which is used in journal bearings, contains  

Solution:

Ans. (a) 83% Cu + 14% Sn + 3% Zinc + 0.8 Phosphorus

QUESTION: 15

Which of the following pairs of plastics and their modes of formation are correctly matched? 
1. Polythene…………….. Condensation polymerization.
2. Polycarbonate .............Addition polymerisation.
3. Polystyrene………….. .Addition polymerisation.
4. Polyamide …………….Either by addition or by condensation polymerisation.
Select the correct answer using the codes given below:

Solution:

Ans. (d)

QUESTION: 16

Match List I (Material) with List II (Typical use) and the correct answer using the codes given below the Lists: 
List I                                                           List II
A. Branched polyethylene                      1. Bottles
B. Polyester                                            2. Textile fibres
C. Polyvinylidene chloride                      3. Films for packaging
D. Linear Polyethylene                           4. Transparent film
     A B C D                                       A B C D
(a) 2 3 4 1                                   (b) 3 2 1 4
(c) 2 3 1 4                                   (d) 3 2 4 1

Solution:

Ans. (b)

QUESTION: 17

What is the process by which two or more chemically different monomers are polymerised to form a cross link polymer together with a by-product such as water or ammonia, known as?  

Solution:

Ans. (d)
• Condensation polymerization process involves more then one monomer species. This process is also known as step growth polymerization.
• In condensation polymerization, smaller macromolecule by-product such as water is
eliminated.
• No resultant product has the chemical formula of mere one monomer.
• Repeat unit in condensation process itself is product of polymerization involving basic
constituents.
• Reaction times for condensation polymerization are usually longer than those for additional polymerization.



E.g.:Formation of a polyester from Ethylene glycol and Adipic acid

 

QUESTION: 18

Which one of the following possesses the property of non sparking character?  

Solution:

Ans. (b)

QUESTION: 19

Assertion (A): Addition polymerization is a primary summation of individualmolecules into long chains,
Reason (R): In addition polymerization, the reaction produces a small molecule asby-product.

Solution:

Ans. (c)

QUESTION: 20

Consider the following:  
Which of the following properties are possessed by plastics?
1. Good resistance to corrosive atmosphere
2. Ease of fabrication into complex shapes.
3. Good resistance to shocks and vibrations.
Select the correct answer using the code given below:

Solution:

Ans. (a)

QUESTION: 21

Consider the following statements in respect of fabrication of plastic products:
1. Compression moulding is analogous to hot pressing of powdered metals.  
2. Jet moulding is a modification of compression moulding.
3. Injection moulding is analogous to die casting of metals
4. Transfer moulding is similar to hydraulic extrusion.
Which of these statements are correct?

Solution:

Ans. (c)

QUESTION: 22

To reduce the consumption of synthetic resins, the ingredient added is  

Solution:

Ans. (d)

QUESTION: 23

Consider the following statements:  
1. Thermoplastics possess a strong intermolecular bonding compared to that ofthermosetting plastics.
2. Plastics have a high creep under continuous loading.
3. Embrittlement occurs in plastics at low temperature.
Which of these statements are correct?

Solution:

Ans. (b)

QUESTION: 24

Which of the following processes can be used for mass production of plasticcontainers (with lid) of 5 liter capacity? 
1. Injection moulding
2. Jolt moulding
3. Blow moulding
Select the correct answer using the codes given below:
Codes:

Solution:

Ans. (c)

QUESTION: 25

Weldable type plastic(s) include (s)  

Solution:

Ans. (b) only the thermoplastic polymers can be welded, since these materials can be melted or softened by heat without degradation. The thermosetting polymers do not soften with heat but tend only to char or burn.

QUESTION: 26

Which one of the following are the processes for thermosetting materials?         
1. Compression
2. Transfer moulding
3. Injection moulding
4. Extrusion
Select the correct answer using the codes given below:

Solution:

Ans. (b)

QUESTION: 27

Fillers are added to plastics to 

Solution:

Ans. (d)

QUESTION: 28

Which one of the following statements is not correct? 

Solution:

Ans. (c) Thermoplastics are made suitable for extrusion moulding.

QUESTION: 29

Match List-I with List-II and select the correct answer using the code given below the Lists:  
List-I                                                               List-II
(Article)                                                   (Processing Method)

A. Disposable coffee cups                      1. Rotomoulding
B. Large water tanks                              2. Expandable bead moulding
C. Plastic sheets                                    3. Thermoforming
D. Cushion pads                                   4. Blow moulding
5. Calendering
Code: A B C D                               A B C D
     (a) 3 5 1 2                            (b) 4 5 1 2
     (c) 4 3 2 1                            (d) 3 1 5 2

Solution:

Ans. (d)

QUESTION: 30

Match List I (Type of moulding) List II (Mechanism involved) and select the collect answer using the codes given below the Lists: 
List I                                                        List II
A. Compression moulding                   1. Mould cavity must be heated to cure the plastic forced into it.
B. Injected moulding                            2. Similar to Hydraulic extrusion
C. Jet moulding                                   3. Analogous to the hot pressing of powered metals
D. Extrusion moulding                         4. Analogous to die casting of metals
      A B C D                                       A B C D
(a) 2 4 1 3                                     (b) 3 1 4 2
(c) 2 1 4 3                                     (d) 3 4 1 2

Solution:

Ans. (d)