Multiple choice. For the following questions please circle the letter of the mos
ID: 1717209 • Letter: M
Question
Multiple choice. For the following questions please circle the letter of the most correct answer
1. Metals such as lead and tin have recrystallization temperatures around room temperature. A consequence of this is:
a) They are liquid at room temperature
b) They have high tensile strengths
c) They do not normally work harden
d) They constantly change crystal structures
2. In sand casting the function of the riser is to:
a) Lift the mould to an acceptable pouring height
b) Hold the cope and the drag together
c) Provide molten metal to the casting as it cools
d) Form the shape of the internal cavity
3. Why do steels which have been held at high temperatures suffer from size and shape distortion when cooled?
a) Because metals contract when they cool
b) Because steel changes crystal structure
c) Because of uneven cooling
d) All of the above
4. Which of the following manufacturing process will make threads of the highest strength and quality?
a) Machining
b) Rolling
c) Forging
d) Casting
5. What of these statements about polymers is generally true?
a) Thermoplastics are easier to recycle than thermosets and elastomers
b) Thermosets are easier to recycle than thermoplastics and elastomers
c) Elastomers are easier to recycle than thermoplastics and thermosets
d) It is impossible to recycle polymers
6. Why is the reinforcement in glass fibre reinforced composites able to support a major proportion of the load?
a) The reinforcement has a higher ultimate tensile strength
b) The matrix has a lower yield stress
c) The reinforcement has a higher Young’s Modulus
d) The matrix has a higher toughness
7. In EDM the work-piece must be:
a) An insulator
b) A Semiconductor
c) A Conductor
d) None of the above
8. An unsuccessful casting resulted in a tear between the gate and the part. What changes should be made to the mould design?
a) The gate should be widened
b) The riser should be bigger
c) Chills should be used
d) All of the above are possible answers
9. If you need only a few cast parts, which process would result in the lowest cost per part?
a) Die casting
b) Shell casting
c) Centrifugal casting
d) Sand casting
10. Which of the following is not an advantage of forged parts over cast parts?
a) Intricate shapes
b) Higher ductility
c) Higher toughness
d) Smaller grain size
11. Which of the following statements about forgings is generally true?
a) The external draft angle should be bigger than the internal
b) The internal draft angle should be bigger than the external
c) The external and internal draft angles should be the same
d) Forgings don’t have draft angles
12. Spinning is mainly used to shape:
a) Sheet metals
b) Plate metals
c) Wire metals
d) Rod metals
13. Which is not a positive attribute of powder injection moulding?
a) High density parts
b) Large parts
c) Intricate parts
d) High production volume
14. Powder metal parts are commonly used for gears, bearings, racers and cams because…
a) They are high density
b) They can be made with exotic alloys
c) They can be impregnated with lubricants
d) They have high fatigue resistance
15. Which of the following methods is not economically suited to producing less than 100 plastic parts?
a) Injection moulding
b) Additive manufacturing
c) Machining
d) Silicon moulding
16. Ultra sonic machining is best suited for:
a) Hard and brittle materials
b) Soft and ductile materials
c) Chemically resistant materials
d) Chemically corrosive materials
17. Which process is best suited to producing small holes with very high aspect ratios?
a) Drilling
b) Water-jet machining
c) Wire Electrode discharge machining
d) Laser beam machining
18. What is the ‘kerf width’?
a) The distance between the fixtures on either side of the part
b) The gap created by a cutting tool
c) The distance between the tool and the work piece
d) The size of the burr
19. Incremental forming can be described as:
a) A forming process that uses a spinning tool to form 3D surfaces incrementally
b) A stretching process that slowly forms material over a mandrel
c) A forming process that uses high temperatures and pressure to form sheet metal
d) A forming method that forms 3D shapes incrementally by bending
20. Creep feed grinding is comparable with which metal removal operation in terms of material removal rate?
a) Honing
b) Centre-less grinding
c) Ultrasonic machining
d) Milling
Explanation / Answer
1) D
2) C
3) B
4) D
5) A
6) A
7) C
8) A
9) D
10) A
11) D
12) C
13) D
14) C
15) B
16) A
17) C
18) B
19) D
20) C
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