QUIZ ACTIVITY - MODULE 4 & 5 _ IME_BESCK204D_B SECTION

Aerospace engineers need to design a lightweight aircraft wing that retains high strength and fatigue resistance. Which material would be most suitable and why?

• Steel-reinforced polymer

• Carbon fiber reinforced polymer (CFRP)

• Aluminum alloy

• Glass fiber reinforced epoxy

Shape memory alloys (SMAs) are preferred for medical stents primarily because:

• They are magnetic and easily detectable

• They resist corrosion better than all other materials

• They can expand and return to shape at body temperature

• They are cheaper than stainless steel

You are asked to identify a ferrous material with 0.4% carbon content. What classification does it fall under?

• Cast iron

• Low carbon steel

• Medium carbon steel

• High carbon steel

An automotive company wants to reduce vehicle weight without compromising structural strength. Which composite would you recommend to replace steel in the chassis?

• Wood-fiber composite

• Carbon fiber reinforced plastic

• Epoxy resin

• Stainless steel composite

To join copper pipes for plumbing with minimal heat distortion and good mechanical strength, which method is best?

• Electric arc welding

• Soldering with tin-lead alloy

• Brazing using brass (spelter)

• Gas metal arc welding (GMAW)

In assembling electronic circuits, why is soldering more preferred over brazing?

• It requires higher temperature

• It offers stronger joints

• It is suitable for delicate components

• It avoids use of flux

A welder is tasked with joining a metal that is highly sensitive to oxidation, such as aluminum. Which type of gas flame should be used during welding, and what is the reasoning behind its selection?

• Neutral flame – to maintain balance between oxygen and acetylene

• Oxidizing flame – to provide extra heat for faster welding

• Reducing (Carburizing) flame – to prevent oxidation of the metal

• Blue flame – to reduce thermal expansion

An aerospace engineer must select a material that can endure high thermal loads while maintaining structural strength. Which type of composite material is most suitable, and why?

• Polymer Matrix Composite (PMC) – due to low density

• Metal Matrix Composite (MMC) – for high thermal resistance and strength

• Ceramic Matrix Composite (CMC) – for high corrosion resistance

• Natural Fiber Composite – for eco-friendliness

A material is made by embedding carbon fibers into a plastic resin matrix. How is this composite classified?

• Metal Matrix Composite (MMC)

• Ceramic Matrix Composite (CMC)

• Polymer Matrix Composite (PMC)

• Natural Fiber Composite

An engineer is tasked with welding thick steel sections at a construction site. Why would electric arc welding be a preferred choice over gas welding?

• It is less expensive and does not need shielding

• It provides deeper penetration and higher heat input

• It requires no electrode or filler metal

• It can only be used in laboratory environments