Engineering Chemistry Questions and Answers – Polymeric Composites

This set of Engineering Chemistry Multiple Choice Questions & Answers (MCQs) focuses on “Polymeric Composites”.

1. Which of the following does not combine with fiber to give composites?
a) Metals
b) Ceramics
c) Non-metals
d) Polymers
View Answer

Answer: c
Explanation: Composites are obtained from metals, ceramics and polymers by adding fibers to them. Non-metals do not contribute to the formation of composites.

2. Which of the following is not a property of matrix materials which are modified by adding particulate fillers?
a) Improved performance at elevated temperature
b) Decrease in surface hardness
c) Modification in electrical conductivity
d) Improved abrasion resistance
View Answer

Answer: b
Explanation: Improved performance at elevated temperature, decrease in surface hardness, modification in electrical conductivity, improved abrasion resistance are some of the properties of matrix materials which are modified by adding particulate fillers.

3. What is the aspect ratio?
a) Length to diameter ratio
b) Length to depth ratio
c) Depth to length ratio
d) Diameter to length ratio
View Answer

Answer: a
Explanation: Aspect ratio is defined as length to diameter ratio. The aspect ratio is expressed as two numbers separated by a colon (x:y). The values x and y do not represent actual length and diameter but, rather, the relationship between length and diameter.
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4. Which of the following type of composite is not classified under the category of number of layers?
a) Unidirectional fibre reinforced
b) Laminar
c) Sandwich panels
d) Glass-fibre reinforced
View Answer

Answer: d
Explanation: Glass-fiber reinforced composite is not classified under the category of number of layers. All the other options are classified under this category.

5. The matrix phase controls the environmental resistance of the composites.
a) True
b) False
View Answer

Answer: a
Explanation: The matrix phase controls the environmental resistance of the composites. Since Polymer Matrix Composites combine a resin system and reinforcing fibers, the properties of the resulting composite material will combine something of the properties of the resin on its own with that of the fibers on their own.
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6. Select the incorrect statement from the following option.
a) Laminar composites consist of 2-D sheets that are stacked and subsequently cemented together
b) Sandwich panels consist of two stronger outer sheets separated by a layer of less dense core material
c) Core material should be heavy-weight and low corrosion resistance
d) The stiffness of the sandwich panel increases as the core thickness increases
View Answer

Answer: c
Explanation: Core material should be light-weight and high corrosion resistance. All the other options are correct. Laminar composites consist of 2-D sheets that are stacked and subsequently cemented together. Sandwich panels consist of two stronger outer sheets separated by a layer of less dense core material and the stiffness of the sandwich panel increases as the core thickness increases.

7. One of the most popular types of core material used is ____________
a) Metal foam
b) Honeycomb
c) Glass
d) Plastic
View Answer

Answer: b
Explanation: One of the most popular types of core material used is a honeycomb structure. Rest all options are not used widely as core material should be light-weight and high corrosion resistance.
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8. The flexural stiffness of the sandwich panel is proportional to the _____________ of core thickness.
a) Square
b) Square root
c) Inverse
d) Cube
View Answer

Answer: d
Explanation: The flexural stiffness of the sandwich panel is proportional to the cube of core thickness. It increases with the thickness of the core material.

9. Which of the following is not an application of a sandwich panel?
a) Fabrication of wings of aircrafts
b) Design of ships, boat hulls
c) Conveyor belts
d) Fabrication of roofs, floors and walls of buildings
View Answer

Answer: c
Explanation: Fabrication of wings of aircrafts, design of ships, boat hulls and fabrication of roofs, floors and walls of buildings are some of the applications of sandwich panel. Conveyor belts are not the application of sandwich panel.

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10. When fibers are used as a dispersed phase for the reinforcement of matrices, the resultant composites are known as ____________
a) Glass-fiber reinforced
b) Carbon-fiber reinforced
c) Wood-fiber reinforced
d) Unidirectional-fiber reinforced
View Answer

Answer: a
Explanation: When fibers are used as a dispersed phase for the reinforcement of matrices, the resultant composites are known as glass-fiber reinforced. Glass-fiber reinforced composites should have low density, high impact resistance, high tensile strength and excellent chemical and corrosion resistance.

11. Which of the following is not a characteristic of glass-fiber reinforced composites?
a) Low density
b) Low impact resistance
c) High tensile strength
d) Excellent chemical and corrosion resistance
View Answer

Answer: b
Explanation: Glass-fiber reinforced composites should have low density, high impact resistance, high tensile strength and excellent chemical and corrosion resistance.

12. Which of the following is an application of glass-fiber reinforced composites?
a) Adhesives
b) Conveyor belts
c) Design of ships
d) Automotive parts
View Answer

Answer: d
Explanation: Automotive parts, storage tanks, plastic pipes etc are some of the applications of glass-fiber reinforced composites.

13. Which of the following is used as reinforcement in advanced polymer matrix composite?
a) Glass-fiber reinforced
b) Carbon-fiber reinforced
c) Wood-fiber reinforced
d) Unidirectional-fiber reinforced
View Answer

Answer: b
Explanation: Carbon-fiber reinforced is used as reinforcement in advanced polymer matrix composite, which requires retention of desired properties.

14. Which of the following is not an advantage of composites?
a) Easy to manufacture and durable
b) Excellent thermal, mechanical and chemical properties
c) Heavy-weight and non-versatile
d) Economical and tailor made
View Answer

Answer: c
Explanation: Composites are light-weight and versatile. All the other options are correct. They are easy to manufacture and durable, have excellent thermal, mechanical and chemical properties and economical and tailor made.

15. The principal applications of composites are in transportation industry, consumer products and industrial and scientific equipment.
a) True
b) False
View Answer

Answer: a
Explanation: The principal applications of composites are in transportation industry, consumer products and industrial and scientific equipment. But composites can fail on the microscopic or macroscopic scale. Compression failures can occur at both the macro scale or at each individual reinforcing fiber in compression buckling. Tension failures can be net section failures of the part or degradation of the composite at a microscopic scale where one or more of the layers in the composite fail in tension of the matrix or failure of the bond between the matrix and fibers.

Sanfoundry Global Education & Learning Series – Engineering Chemistry.

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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