30 Questions
What type of materials do electronic engineers search for?
Materials for the fabrication and miniaturization of electronic devices
Why is it crucial for engineers to know the internal structure and engineering properties of materials?
To meet requirements for various applications
What can happen if systematic material selection based on required properties is not performed?
Potential disasters
Why did a class of welded merchant ships suffer heavy losses during World War II?
Low fracture toughness of the steel welds
Why are materials critical in the field of engineering according to the text?
Materials are the foundation of engineering
What was the key issue leading to the high losses suffered by the welded merchant ships during World War II?
Low fracture toughness of steel welds
What is a common reason for the failure of appliances made of plastic?
Low modulus of elasticity
Which property of materials is typically related to a material's ability to withstand repeated loading without breaking?
Fatigue strength
What common consequence occurs when aircraft use materials with lower fatigue strength?
Aircraft lost
Which property relates to a material's resistance to gradual deformation under constant loading?
Creep strength
What type of property would be most crucial for a material used in aircraft components subjected to rapid temperature changes?
Thermal expansion coefficient
Which property of materials is associated with their ability to absorb energy when deformed elastically?
Damping
What is the purpose of the compressor blades in a turbofan engine?
To compress the air before mixing it with fuel
Why is density an important factor for the engine?
To reduce weight in order to carry more payload
What material are composite blades made of to reduce weight in the engine?
Carbon-fibre reinforced polymers (CFRP)
What application requires turbine blades to have high resistance to creep and oxidation?
Running at high temperatures in the engine
Why are metallic leading edges used to clad composite blades?
To improve toughness
Which material is used in the HP1 turbine blades for high resistance to creep and oxidation?
Nickel-based alloys
What is the primary focus of mechanical engineers according to the text?
Searching for high temp materials for gas turbines and engines
Based on the text, what is the main concern of electrical engineers?
Finding materials that are good conductors of electricity
What do aerospace and automobile engineers prioritize?
Seeking materials with high strength-to weight ratios
What is the main goal of engineering as defined in the ABET statement?
Developing ways to utilize materials and forces of nature for mankind's benefit
Why do electrical engineers primarily seek materials with good conductivity?
To operate electrical devices at faster rates with minimal power losses
What's a common objective for mechanical, electrical, aerospace, and automobile engineers?
Searching for materials with high strength-to weight ratios
What type of material is high-carbon steel known for its high modulus and fracture toughness?
Metal
Why is high yield strength important for the shaft of a screwdriver?
To resist bending and twisting
Why is it mentioned that wood is still important but being replaced by PMMA?
PMMA is easier to fabricate than wood
Which material is preferred for the handle of the screwdriver due to its low density and affordability?
PMMA
Why is a thin skin of rubber mentioned as possibly useful for the handle of the screwdriver?
To reduce the coefficient of friction
What property of high-carbon steel makes it suitable for the blade of the screwdriver?
High hardness
Explore the fundamental concepts of engineering materials in MEC 2309. Learn about the application of knowledge of mathematical and natural sciences to develop ways to utilize materials and forces of nature economically. Get ready to delve into the world of engineering materials!
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