EGR 250 Exam 3

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OUTOFCHILLPILLZ
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286710
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EGR 250 Exam 3
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2014-10-24 00:22:52
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Material Science
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  1. Vermicular graphite is an undesirable microstructural feature in the ductile iron; however it is the desired type of graphite in:

    A White cast iron
    B Gray cast iron
    C Compacted graphite cast iron
    D Malleable cast iron
    E None of the above
    C Compacted graphite cast iron
    (this multiple choice question has been scrambled)
  2. The carbon equivalent value for a 3.5 wt. % C cast iron containing 1.5 wt. % Si and 0.1wt. % P.

    A 3.50 %
    B 4.03 %
    C 4.50 %
    D 4.00 %
    E None of the above
    B 4.03 %
    (this multiple choice question has been scrambled)
  3. We typically expect the strength of a cast iron to

    A Decrease when the carbon equivalent increases
    B Be unaffected by the carbon equivalent
    C Increase when the carbon equivalent increases
    D None of the above
    A Decrease when the carbon equivalent increases
    (this multiple choice question has been scrambled)
  4. According to the AFS-ASTM A247 standard, the following graphite flake pattern is produced by the slow solidification of a hypereutectic grey cast iron:

    A Type A
    B Type D
    C Type II
    D Type I
    E Type C
    F None of the above
    D Type I
    (this multiple choice question has been scrambled)
  5. Suppose you treat liquid iron with magnesium, innoculate, then wait 10 minutes before pouring. If you produce a white cast iron microstructure instead of ductile iron, then you expect the

    A Nodularizating element faded
    B Inoculating agent faded
    C None of the above
    B Inoculating agent faded
  6. Production of the following alloy cast iron requires addition of 20 wt. % Ni:

    A Pearlitic malleable cast iron
    B Ferritic cast iron
    C Austenitic cast iron
    D Nodular cast iron
    E None of the above
    C Austenitic cast iron
    (this multiple choice question has been scrambled)
  7. According to ISO 5922, the following designation W 45-10 is for the following malleable cast iron:

    A This is a blackheart malleable cast iron with a minimum tensile strength of 45P MPa and % elongation of 10%
    B This is a whiteheart malleable cast iron with a minimum tensile strength of 45P MPa and % elongation of 10%
    C This is a blackheart malleable cast iron with a minimum tensile strength of 450 MPa and % elongation of 10%
    D This is a whiteheart malleable cast iron with a minimum tensile strength of 450 MPa and % elongation of 10%
    D This is a whiteheart malleable cast iron with a minimum tensile strength of 450 MPa and % elongation of 10%
    (this multiple choice question has been scrambled)
  8. Which of the following types of cast irons is endangered by fast solidification rate?
    A Nodular cast
    B Gray
    C Plain carbon
    D White cast iron
    D white cast iron
    (this multiple choice question has been scrambled)
  9. which of the following phases are said to be metastable?
    A Ferrite
    B Martensite
    C Austenite
    D Pearlite
    E Cementite
    E cementite, and martensite
    (this multiple choice question has been scrambled)
  10. What range of carbon defines Fe-C as cast iron?
    A 2.0 - 6.67 wt%
    B 0.02 - 2.0 wt%
    C 0.0 - 0.8 wt%
    D 99 - 100 wt%
    A 2.0 - 6.67 wt%
    (this multiple choice question has been scrambled)
  11. Which of these alloys are used for service temperatures in the range between 500℃ and 1,000℃?

    A Cast irons
    B Refractory alloys
    C Aluminum and copper alloys
    D Lead and its alloys
    E Stainless steels
    F None of the above
    B Refractory alloys
    (this multiple choice question has been scrambled)
  12. The wing of an aircraft made out of a metal alloy is an example of a

    A Wrought product
    B Both cast and wrought
    C Cast product
    D None of the above
    A Wrought product
    (this multiple choice question has been scrambled)
  13. An automotive engine block is an example of a

    A Both cast and wrought
    B Wrought product
    C Cast product
    D None of the above
    C Cast product
    (this multiple choice question has been scrambled)
  14. What is the average carbon content of AISI 1080 steel?

    A 0.30 wt.% C
    B 0.60 wt.% C
    C 0.10 wt.% C
    D 0.80 wt.% C
    D 0.80 wt.% C
    (this multiple choice question has been scrambled)
  15. which of the following statements best describes cast irons?

    A Precious metals
    B An alloy of carbon in iron
    C High purity iron
    D An alloy of silicon in iron
    B An alloy of carbon in iron
    (this multiple choice question has been scrambled)
  16. What range of carbon percentages defines Fe-C alloy as steel?

    A 0.0 -.8 wt.%C
    B 2.0 - 6.67 wt.%C
    C 0.0 - 2.0 wt.%C
    D 0.02 - 2.0 wt.%C
    D 0.02 - 2.0 wt.%C
    (this multiple choice question has been scrambled)
  17. What is the average carbon content of AISI 4330 steel?

    A 0.33 wt.%C
    B 0.43 wt.%C
    C 0.60 wt.%C
    D 0.30 wt.%C
    E None of the above
    D 0.30 wt.%C
    (this multiple choice question has been scrambled)
  18. Which of the following statements are not true?

    1 Si enhances graphitization, and thus increases the tendency of graphite to transform to cementite
    2 Cr enhances the chilling tendency in a solidifying cast iron.
    3 C Grey cast iron formation is promoted by either a high carbon with the low silicon or a low carbon with high silicon
    4 In general, grey cast iron formation is enhanced by slow solidification rate, high Cr content , and low Si
    5 Cast irons with carbon equivalent values of 4.3 wt. % are called hypoeutectic irons.
    6 Flake graphite cast irons are inoculated to reduce chilling tendency.
    7 The gray iron eutectic reaction: Liquid → Austenite + graphite occurs at 1,153०c and carbon equivalent of 4.30 wt. %
    8 The L → ૪ + Fe3C eutectic reaction is the metastable reaction that produces ductile cast iron
    9 The excellent damping capacity of graphite-based cast iron is independent of the nature and size of the graphite in cast iron.
    10 None of the above
    1, 4, 5, 8, and 9
  19. As an engineer in a malleable cast iron foundry which of the following would concern you:

    Increase the molten metal temperature prior to pouring it into the casting mold.

    Incoming raw material with the composition 2 wt. % Si, 0.8 wt. % Mn, and 0.4 wt. % S.

    A suggestion by a crew supervisor to inoculate melts 20 minutes before pouring.

    Suggestion by one of the foundrymen to cast a thin section in a sand mold.

    Suggestion by an experienced shop floor worker in the foundry to use a high-Cr raw material to cast a thin section in a copper mold.

    Changing to a new supplier whose raw material is cheaper but has slightly higher carbon and lower Cr (with the same Si level) than your present supplier.
    Increase the molten metal temperature prior to pouring it into the casting mold. $$$$ Incoming raw material with the composition 2 wt. % Si, 0.8 wt. % Mn, and 0.4 wt. % S. $$$$ Suggestion by one of the foundrymen to cast a thin section in a sand mold. $$$$ Changing to a new supplier whose raw material is cheaper but has slightly higher carbon and lower Cr (with the same Si level) than your present supplier.
  20. Amorphous Polymers exhibit which properties?
    No melting temperature - broad softening temperature, Usually transparent, Low shrinkage, Solvent sensitive, Poor fatigue and wear resistance properties
  21. Crystalline Polymers exhibit which properties?
    sharp melting temperatures, Usually opaque, High shrinkage, Solvent resistive, Goor fatigue and wear resistance properties
  22. Which one of the following is the correct definition of ultimate tensile strength, as derived from the results of a tensile test on a metal specimen?

    A The maximum load divided by the original area of specimen
    B The stress observed when the specimen finally fails
    C The stress encountered when the stress-strain curve transforms from elastic to plastic behavior.
    D The maximum load divided by the final area of specimen.
    A The maximum load divided by the original area of specimen
    (this multiple choice question has been scrambled)
  23. Which one of the following types of stress-strain relationship best describes the behavior of most metals at room temperature?

    A Perfectly elastic
    B Elastic and perfectly plastic
    C Elastic and strain hardening
    D None of the above
    C Elastic and strain hardening
    (this multiple choice question has been scrambled)
  24. The shear strength of metal is usually

    A Greater than its tensile strength
    B Less than its tensile strength
    C None of the above
    A Greater than its tensile strength
  25. The stress at which the maximum force that can be withstood by either a ductile or a brittle material is called the:

    A Tensile strength
    B Modulus of elasticity
    C Yield strength
    D Breaking strength
    ATensile strength
  26. The slope of stress-strain curve, which is determined primarily by the strength of the atomic bonds within the material, is called the:

    A Modulus of elasticity
    B 0.2% offset yield strength
    C Yield strength
    D Tensile strength
    A Modulus of elasticity
    (this multiple choice question has been scrambled)
  27. What does manganese do as an alloy in steels?

    A improves machinability and increases cementite formation
    B decrease hardenability and increase high temperature properties
    C combine with sulfur to prevent brittleness and improves hardenability
    D reduces nodules and enhances corrsion resistance
    C combine with sulfur to prevent brittleness and improves hardenability
    (this multiple choice question has been scrambled)
  28. Which of theses are not base physical properties of materials?

    A thermal properties
    B electrical properties
    C magnetic properties
    D corrosion properties
    E volumetric properties
    F melting properties
    G optical properties
    D corrosion
    (this multiple choice question has been scrambled)
  29. Which part has the greater stress:(i) a rectangular aluminum bar of 24.6 mm x 30.7 mm cross section, under a load of 7,640 kg; or (ii) a round steel bar whose cross sectional diameter is 12.8 mm under a 5,000 kg load?

    A The rectangular aluminum bar
    B The Round steel bar
    C The stress on both bars is the same
    B The Round steel bar
    (this multiple choice question has been scrambled)
  30. What is Damping Capacity?
    The ability to absorb vibrations
  31. An age hardening alloy is

    A A heat treatable alloy
    B Both heat and non-heat
    C All
    D None
    E A non-heat treatable alloy
    F A cast iron
    A A heat treatable alloy
    (this multiple choice question has been scrambled)
  32. The location of the specimen taken in a metallographic study is determined by:

    A The type of microscope to be used
    B The purpose of the metallographic study
    C The type of etchant to be used
    D The type of mounting press to be used
    B The purpose of the metallographic study
    (this multiple choice question has been scrambled)
  33. What are the typical etchants used for the macroetching of steel?

    A A heated 50% conc. HCl solution at 70/80 degrees C for 13-30 minutes
    B Mixtures of HCl and HNO3 containing some HF
    C 50% aqueous HNO3
    D Keller's reagent and Graff/Sargent
    A A heated 50% conc. HCl solution at 70/80 degrees C for 13-30 minutes
    (this multiple choice question has been scrambled)
  34. What are the typical etchants used for the microetching of aluminum and its alloys?

    A 2% HF, 25% HNO3, 73% H20
    B Alcoholic ferric chloride consisting of 5g of FeCl3
    C 1%, 2%, and 5% of HNO3 in alchohal (Nital)
    D Keller's reagent and Graff/Sargent
    D Keller's reagent and Graff/Sargent
    (this multiple choice question has been scrambled)
  35. Which of the following metallic elements is the most abundant on the earth?
    A. Copper
    B. Iron
    C. Aluminum
    D. Silicon
    e. None of the above
    C. Aluminum
    (this multiple choice question has been scrambled)

  36. Which of the cast irons above is/are produced by heat treatment of the cast product?

    A (vi)
    B (ii)
    C (v)
    D (iv)
    E (iii)
    F (i)
    G None of the above
    E (iii) and (v)
    (this multiple choice question has been scrambled)
  37. Yea phases
  38. A            B             C                  D               E
  39. Give the form number and shape
    Type I - spheroidal graphite

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