Part4 Multiplae choise 1. Stereolithography Apparatus (SLA) uses a: A. Laser sou
ID: 1717215 • Letter: P
Question
Part4
Multiplae choise
1. Stereolithography Apparatus (SLA) uses a:
A. Laser source and liquid photosensitive resin
B. Laser beam and metal composite materials
C. Heated roller and layers of paper or plastic
D. Photo-curable resin and UV light to cure it
2. Punching and blanking are operations based on….
A. Compression
B. Shearing
C. Forging
D. Drawing
3. What of the following are used in the calculation of the roll force?
A. Compression strength
B. Final true stress
C. Yield strength
D. Average true strength
4. In shielded metal-arc welding, or stick welding the electrode coating:
A. Deoxidises the weld area
B. Improves the conductivity of the electrode
C. Lubricates the movement of the stick
D. All of the above
6. Oxidising flames in oxy-fuel gas welding is generally used for the welding of?
A. Copper based alloys
B. Stainless steels
C. Aluminium alloys
D. Carbon steel
7. Identify which of the following reinforcing fibres absorb moisture and in turn experience a reduction in properties:
A. Graphite
B. Whiskers
C. Aramids (Kevlar)
D. Boron
8. What manufacturing process is best suited to making plastic water bottles?
A. Compression moulding
B. Transfer moulding
C. Blow moulding
D. Thermoforming
9. An important characteristic for abrasives is friability. What is friability?
A. The ability of abrasive grains to fracture into smaller pieces
B. The chemical reaction of abrasive grains with the work piece
C. The irregular shapes of the individual grains
D. The rake angle of the abrasive grains
11. The extent of plastic deformation that the material undergoes before fracture when it is in tension is a behaviour known as:
A. Yield
B. Stiffness
C. Ductility
D. Toughness
12. What is a broach?
A. A single point threading tool, typically with a 60° pointed nose that cuts threads into the outer surface of the work piece
B. A long cutting tool with a series of multiple teeth that removes material in one pass
C. A sharp single point tool
D. A cutting tool with a hollow interior so it can be mounted onto an arbor
13. Hobbing is used in the manufacture of: A. Hobbies
B. Internal cylindrical gears
C. External cylindrical gears
D. Rack gears
14. Usually, the softer constituent of a composite is the:
A. Matrix
B. Reinforcement
C. Both are of equal hardness
D. Surfactant
15. The reasons for using cutting fluid are:
A. Improve tolerances and reduce environmental effects
B. Improve tolerances whilst decreasing cutting speed
C. Extend tool life, reduce thermal distortion and improve surface finish
D. Extend tool life and provide chemical stability
16. The mechanical properties of fibre reinforced composites depend on:
A. The strength of the individual components
B. The strength of the interface between the components
C. Fibre length, orientation and volume fraction
D. All of the above
17. The flash has a significant role in the impression die forging process, what does it do?
A. It encourages the material to fill the die cavity
B. It facilitates the removal of the forging from the die cavity
C. It stores excess material
D. It prevents contamination of the material
18. When casting a part, the pattern should be dimensioned to take into account of:
A. The porosity
B. Shrinkage
C. Angles
D. The part line
19. What is Ultrasonic machining?
A. A microscope drilling process
B. A microscopic milling process
C. A microscopic turning process
D. A microscopic grinding process
20. The mechanical and physical properties of Alumina are particularly suitable in applications such as:
A. Heat engine components
B. Dies
C. Sand blast nozzles
D. Electrical and thermal insulation
22. What is the density of compacts produced by hot isostatic pressing (HIP) process?
A. About 90%
B. Nearly 75%
C. Maximum 85%
D. Almost 100%
23. Temperature control and stirring during chemical milling is important, why?
A. To obtain uniform depth of material removal
B. To penetrate through the thickness of the material
C. To ensure good adhesion of the masking material
D. To prevent further reactions with any residues.
27. The diameter of the wire used for wire EDM is generally in the range of:
A. 0.8 – 1.0 mm
B. 0.3 – 0.8 mm
C. 0.2 – 0.3 mm
D. 0.01 – 0.1 mm
30. A typical heat treatment cycle in sintering is:
A. Preheat then cool down then sinter
B. Preheat then sinter then cool down
C. Sinter then preheat then cool down
D. There is NO heat treatment cycle in sintering
31. One of the reasons for blending metal powders in powder metallurgy is:
A. To change the texture if PM parts
B. To convert molten metal into a spray of droplets
C. To obtain uniformity
D. To achieve high part densities
32. Which of the following statements is true?
A. The sintering temperature of tungsten is higher than stainless steel
B. The sintering temperature of tungsten is lower than stainless steel
C. The sintering temperature of tungsten is the same as stainless steel
D. All of the above (the sintering temperature varies widely with changes in pressure)
33. The percentage of scrap produced in powder metallurgy is approximately:
A. 10%
B. 1%
C. 5%
D. 15%
34. Metal injection moulding is mainly used for the manufacture of:
A. Springs
B. Small simple parts
C. Small complicated parts
D. Medium sized organically shaped parts
35. In powder metallurgy the pressed powder after compaction is called the green compact, the word green meaning:
A. Environmentally friendly
B. Fully processed
C. Hot D. Not fully processed
36. How is spring back overcome in pipe bending?
A. The pipe is cooled to below the annealing temperature
B. The pipe is heated after bending to remove residual stresses
C. The pipe is bent past the desired bend angle
D. None of the above
38. In sheet metal work what is the relevance of the k value?
A. It is a variable used to calculate the required planar shape for a desired folded shape
B. It is a variable used to determine the spring back
C. It is a variable used to determine the minimum bend radius
D. It is a variable used to determine the required gap size
39. In plastic injection moulding common draft angles are approximately:
A. 0.5%
B. 2%
C. 5%
D. 10% 40. Which is not a commonly used synonym for additive manufacturing?
A. Free form fabrication
B. Layer based manufacturing
C. 3D printing
D. Fabricated layer manufacturing
42. Which file format is the current standard for additive manufacturing?
A. STL
B. PDF
C. IGES
D. STEP
43. 3D printing (the process developed by MIT) uses:
A. Lasers and resins
B. Lasers and powder
C. Adhesives and powder
D. Digital light projection and resins
44. Which is not an advantage of machining over additive manufacturing?
A. Speed
B. Part complexity
C. Size
D. Accuracy
45. Generally when building long AM parts it is better to:
A. Build the part horizontally
B. Build the part so that concave features face up
C. Build the part in the orientation of the loading when in use
D. All of the above
46. Electrospinning is a low cost method of producing fibres of what material and size?
A. Plastic nano-fibres
B. Plastic milli-fibers
C. Metallic micro-fibers
D. silicon nano-fibres
51. Rotation moulding is used for:
A. Small intricate parts
B. Large complex parts
C. Large simple parts
D. High volume parts
52. Pressure thermoforming is used when:
A. Pressure differences greater than one atmosphere are required
B. Pressure differences less than one atmosphere are required
C. There is no room for the air to escape
D. A negative mould is used
53. Reaction injection moulding differs from conventional injection moulding in that it…
A. Requires lower temperatures
B. Can be used for larger parts
C. Requires lower clamping forces
D. All of the above
54. Which is not an open mould process for producing continuous fibre composites?
A. Hand lay-up
B. Automated tape laying
C. Centrifugal casting
D. None of the above
55. Carbon fibres are produced by which process (at less at some stage of production)?
A. Spinning
B. Drawing
C. Pultrusion
D. Extrusion
56. Metal matrix composites are produced by:
A. Running the reinforcement through molten metal before being fixed in place
B. Injection molten metal into a preform containing the reinforcement
C. Vapour deposit metal onto the reinforcement
D. All of the above
56. How cool is yoda?
A. Coolest dude ever
B. Absolute zero
C. He is an eskimo
D. I think he is warm blooded
57. Common applications for ceramic matrix composites are:
A. Jet engine parts
B. Cutting tools
C. Dies
D. All of the above 58. In injection moulded parts the wall thickness should be in the range of
: A. 0.1 – 1.0 mm
B. 0.5 – 4.0 mm
C. 2.5 – 3.0 mm
D. 0.1 – 6.0 mm
59. Which manufacturing process creates the strongest shaft?
A. Machining
B. Extruding
C. Forming
D. Sintering
60. Which material has the lowest weldability?
A. Low carbon steel
B. High carbon steel
C. Magnesium alloys
D. Stainless steels
Explanation / Answer
You cannot ask so many questions in one post, Cheggs tells us if questions are different, answer only first.But because it is an objective type assignment, I am answwering 4.You can contact chegg.
1-D - SLA is a process in which photosensitive resins gets hardened by putting UV light on it.
2-B - It is a shearing process.
3-D - All are correct, theses all are purposes of the coating
4-D - Average stresses are used