1. What is the fundamental difference between subtractive and additive manufacturing processes?
a) Subtractive manufacturing builds objects layer by layer, while additive manufacturing removes material from a solid block.
b) Subtractive manufacturing adds material to create objects, while additive manufacturing subtracts material from a solid block.
c) Subtractive manufacturing removes material from a solid block, while additive manufacturing builds objects layer by layer.
d) Subtractive manufacturing involves melting material to form objects, while additive manufacturing involves cutting material to shape.
Answer: c) Subtractive manufacturing removes material from a solid block, while additive manufacturing builds objects layer by layer.
Explanation: Subtractive manufacturing involves cutting away material from a solid block to form the desired shape, while additive manufacturing builds objects layer by layer using materials such as plastics, metals, or ceramics.
2. Which rapid prototyping method uses a vat of liquid resin and a UV light to solidify layers?
a) Material Jetting
b) Selective Laser Sintering
c) VAT Photopolymerization
d) Binder Jetting
Answer: c) VAT Photopolymerization
Explanation: VAT photopolymerization, also known as stereolithography (SLA), uses a vat of liquid resin and a UV light source to solidify layers of the resin to create objects.
3. What is the primary material used in Direct Metal Laser Sintering (DMLS)?
a) Plastic filament
b) Metal powder
c) Ceramic slurry
d) Photopolymer resin
Answer: b) Metal powder
Explanation: Direct Metal Laser Sintering (DMLS) uses metal powder as the primary material, which is melted and fused together using a high-powered laser to create metal objects.
4. In which rapid prototyping method is a powder bed selectively fused together layer by layer using a laser or electron beam?
a) Fused Deposition Modeling (FDM)
b) Selective Laser Melting (SLM)
c) Stereolithography (SLA)
d) Inkjet 3D Printing
Answer: b) Selective Laser Melting (SLM)
Explanation: Selective Laser Melting (SLM) selectively fuses powdered material together layer by layer using a high-powered laser to create metal objects with high precision.
5. Which rapid prototyping method uses a print head to selectively deposit binder onto a powder bed to solidify layers?
a) Material Jetting
b) Selective Laser Sintering (SLS)
c) Binder Jetting
d) Continuous Liquid Interface Production (CLIP)
Answer: c) Binder Jetting
Explanation: Binder Jetting involves selectively depositing a liquid binder onto a powder bed to solidify layers, enabling the creation of objects with various materials such as metals, ceramics, and polymers.
6. What is the main advantage of continuous liquid interface production (CLIP) over traditional 3D printing methods?
a) Faster printing speeds
b) Higher resolution
c) Lower cost of materials
d) Reduced need for support structures
Answer: a) Faster printing speeds
Explanation: Continuous Liquid Interface Production (CLIP) allows for faster printing speeds compared to traditional 3D printing methods by using a continuous liquid interface to cure the resin, enabling rapid fabrication of objects.
7. Which rapid prototyping method involves extruding material through a heated nozzle to build layers?
a) Stereolithography (SLA)
b) Direct Metal Laser Sintering (DMLS)
c) Fused Deposition Modeling (FDM)
d) Selective Laser Melting (SLM)
Answer: c) Fused Deposition Modeling (FDM)
Explanation: Fused Deposition Modeling (FDM) uses a heated nozzle to extrude thermoplastic material layer by layer to create objects.
8. What is the primary advantage of material jetting in rapid prototyping?
a) High printing speeds
b) Wide range of materials
c) Low cost of equipment
d) Minimal post-processing required
Answer: b) Wide range of materials
Explanation: Material jetting allows for the use of a wide range of materials, including multiple colors and material properties, enabling the creation of complex prototypes with varied characteristics.
9. Which additive manufacturing method is particularly suitable for creating intricate geometries with high precision?
a) Binder Jetting
b) Selective Laser Sintering (SLS)
c) Fused Deposition Modeling (FDM)
d) Material Jetting
Answer: b) Selective Laser Sintering (SLS)
Explanation: Selective Laser Sintering (SLS) is particularly suitable for creating intricate geometries with high precision due to its ability to fuse powdered materials together layer by layer using a laser.
10. What distinguishes direct metal laser sintering (DMLS) from other metal additive manufacturing methods?
a) Use of a liquid resin
b) Use of a powder bed
c) Melting of metal powder with a laser
d) Injection of metal binder onto a powder bed
Answer: c) Melting of metal powder with a laser
Explanation: Direct Metal Laser Sintering (DMLS) distinguishes itself by melting metal powder with a high-powered laser to build objects, offering high precision and complex geometries in metal fabrication.