Quiz On Phase Diagrams

33 Questions | Total Attempts: 174

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Quiz On Phase Diagrams

A non-graded Materials Engineering Quiz on Phase Diagrams


Questions and Answers
  • 1. 
    1. يرجى قراءة السؤال جيدا (بفقراته) قبل بدء الإجابة. 2. لا يمكنك الرجوع إلى السؤال بعد تخطيه. 3. يرجى ملاحظة صياغة الإجابات، للتعود عليها وكتابتها حين تطلب منك لاحقا.
  • 2. 
    The pro-eutectic phase is the phase inside the eutectic structure.
    • A. 

      True

    • B. 

      False

  • 3. 
    A & B are two metals which are insoluble in the solid state. As temperature increases, the solubility limit increases.
    • A. 

      True

    • B. 

      False

  • 4. 
    A peritectoid reaction occurs when a solid phase reacts with a liquid phase to produce a new solid phase.
    • A. 

      True

    • B. 

      False

  • 5. 
    Steel, which consists of Iron (metal) and Carbon (non-metal), can be considered as an alloy.
    • A. 

      True

    • B. 

      False

  • 6. 
    In substitutional solid solution between A & B, an atom of A substitutes a void between the atoms of B.
    • A. 

      True

    • B. 

      False

  • 7. 
    The intermetallic compound is considered as a single phase alloy.
    • A. 

      True

    • B. 

      False

  • 8. 
    A eutectic reaction occurs by decomposing a liquid into two solid phases by cooling.
    • A. 

      True

    • B. 

      False

  • 9. 
    There is no probability to find a thermal arrest in an alloy’s cooling curve.
    • A. 

      True

    • B. 

      False

  • 10. 
    For an alloy, solidification starts at the solidus line.
    • A. 

      True

    • B. 

      False

  • 11. 
    Segregation is the composition gradient in each grain of the solid solution, from the middle to the boundaries.
    • A. 

      True

    • B. 

      False

  • 12. 
    Segregation can be eliminated by a heat treatment process called “quenching”.
    • A. 

      True

    • B. 

      False

  • 13. 
    Peritectic reaction occurs by decomposing a solid phase into two solid phases by cooling.
    • A. 

      True

    • B. 

      False

  • 14. 
    Any alloy solidifies in a range of temperatures.
    • A. 

      True

    • B. 

      False

  • 15. 
    If an alloy consists of completely soluble solid solution between Germanium and Silicon, then it has one phase.
    • A. 

      True

    • B. 

      False

  • 16. 
    Tungsten and Palladium are expected to have completely solubility in each other (both have atomic radius = 0.137 nm, Tungsten has a BCC crystal structure and Palladium has FCC crystal structure).
    • A. 

      True

    • B. 

      False

  • 17. 
    An Iron (Fe)-Niobium (Nb) alloy, weighs 3 kg, consists of 70% Fe – 30% Nb, is slowly cooled to a temperature that is just below 1373°C. Find: i.      The weight of the eutectic phase:
    • A. 

      1.24 kg.

    • B. 

      1.76 kg.

    • C. 

      0.73 kg.

    • D. 

      2.27 kg.

    • E. 

      1.85 kg.

    • F. 

      1.15 kg.

    • G. 

      0.72 kg.

    • H. 

      2.28 kg.

  • 18. 
    ii.      The weight of the pro-eutectic phase is:
    • A. 

      1.76 kg.

    • B. 

      1.24 kg.

    • C. 

      2.27 kg.

    • D. 

      0.73 kg.

    • E. 

      1.15 kg.

    • F. 

      1.85 kg.

    • G. 

      2.28 kg.

    • H. 

      0.72 kg.

  • 19. 
    iii.      The weights of the eutectic phases are:
    • A. 

      0.51 kg of e and 0.73 kg of (gFe).

    • B. 

      1.04 kg of e and 0.72 kg of (gFe).

    • C. 

      0.18 kg of e and 0.55 kg of (gFe).

    • D. 

      1.72 kg of e and 0.55 kg of (gFe).

    • E. 

      1.13 kg of m and 0.72 kg of (Nb).

    • F. 

      0.72 kg of m and 1.13 kg of (Nb).

    • G. 

      0.17 kg of m and 0.55 kg of (Nb).

    • H. 

      1.73 kg of m and 0.55 kg of (Nb).

  • 20. 
    iv.      The weights of Fe and Nb in the eutectic phases are:
    • A. 

      0.19 kg of Nb in e, 0.31 kg of Fe in e, 0.04 kg of Nb in (gFe), and 0.69 kg of Fe in (gFe).

    • B. 

      0.05 kg of Nb in e, 0.99 kg of Fe in e, 0.27 kg of Nb in (gFe), and 0.45 kg of Fe in (gFe).

    • C. 

      0.07 kg of Nb in e, 0.11 kg of Fe in e, 0.03 kg of Nb in (gFe), and 0.52 kg of Fe in (gFe).

    • D. 

      0.09 kg of Nb in e, 1.63 kg of Fe in e, 0.21 kg of Nb in (gFe), and 0.34 kg of Fe in (gFe).

    • E. 

      0.43 kg of Fe in m, 0.70 kg of Nb in m, 0.03 kg of Fe in (Nb), and 0.69 kg of Nb in (Nb).

    • F. 

      0.03 kg of Fe in m, 0.69 kg of Nb in m, 0.43 kg of Fe in (Nb), and 0.54 kg of Nb in (Nb).

    • G. 

      0.07 kg of Fe in m, 0.11 kg of Nb in m, 0.21 kg of Fe in (Nb), and 0.34 kg of Nb in (Nb).

    • H. 

      0.08 kg of Fe in m, 1.65 kg of Nb in m, 0.03 kg of Fe in (Nb), and 0.52 kg of Nb in (Nb).

  • 21. 
    v.      The weights of Fe and Nb in the pro-eutectic phase are:
    • A. 

      0.67 kg of Nb, and 1.09 kg of Fe.

    • B. 

      0.06 kg of Nb, and 1.17 kg of Fe.

    • C. 

      0.86 kg of Nb, and 1.41 kg of Fe.

    • D. 

      0.04 kg of Nb, and 0.69 kg of Fe.

    • E. 

      0.44 kg of Fe, and 0.72 kg of Nb.

    • F. 

      0.09 kg of Fe, and 1.76 kg of Nb.

    • G. 

      0.87 kg of Fe, and 1.41 kg of Nb.

    • H. 

      0.03 kg of Fe, and 0.69 kg of Nb.

  • 22. 
    A Germanium (Ge)-Potassium (K) alloy, whose mass is 1000 g, is slowly cooled to a temperature that is just below 575°C. It was then discovered that it contains 615.38 g of pro-eutectic phase GeK. Find: i.      The composition of the alloy.
    • A. 

      40 % of K, and 60 % of Ge.

    • B. 

      43 % of K, and 57 % of Ge.

    • C. 

      45.38 % of K, and 54.62 % of Ge.

    • D. 

      51.62 % of K, and 48.38 % of Ge.

    • E. 

      31.15 % of Ge, and 68.85 % of K.

    • F. 

      28.85 % of Ge, and 71.15 % of K.

    • G. 

      26.15 % of Ge, and 73.85 % of K.

    • H. 

      20.85 % of Ge, and 79.15 % of K.

  • 23. 
    ii.      The amount of the eutectic GeK phase.
    • A. 

      199.43 g.

    • B. 

      20.70 g.

    • C. 

      71.23 g.

    • D. 

      147.93 g.

    • E. 

      217.39 g.

    • F. 

      12.54 g.

    • G. 

      64.32 g.

    • H. 

      147.93 g.

  • 24. 
    iii.      The amount of the eutectic GeK3 phase.
    • A. 

      185.19 g.

    • B. 

      22.30 g.

    • C. 

      113.96 g.

    • D. 

      236.69 g.

    • E. 

      167.23 g.

    • F. 

      16.30 g.

    • G. 

      102.91 g.

    • H. 

      236.69 g.

  • 25. 
    iv.      The weights of Ge and K in the eutectic phases.
    • A. 

      69.80 g of K in GeK, 129.63 g of Ge in GeK, 114.82 g of K in GeK3, and 70.37 g of Ge in GeK3.

    • B. 

      12.84 g of K in GeK, 7.87 g of Ge in GeK, 7.80 g of K in GeK3, and 14.49 g of Ge in GeK3.

    • C. 

      24.93 g of K in GeK, 46.30 g of Ge in GeK, 70.66 g of K in GeK3, and 43.31 g of Ge in GeK3.

    • D. 

      91.72 g of K in GeK, 56.21 g of Ge in GeK, 82.84 g of K in GeK3, and 153.85 g of Ge in GeK3.

    • E. 

      76.09 g of Ge in GeK, 141.31 g of K in GeK, 20.07 g of Ge in Ge4K, and 147.16 g of K in Ge4K.

    • F. 

      1.51 g of Ge in GeK, 11.04 g of K in GeK, 5.71 g of Ge in Ge4K, and 10.60 g of K in Ge4K.

    • G. 

      22.51 g of Ge in GeK, 41.81 g of K in GeK, 12.35 g of Ge in Ge4K, and 90.56 g of K in Ge4K.

    • H. 

      17.75 g of Ge in GeK, 130.18 g of K in GeK, 82.84 g of Ge in Ge4K, and 153.85 g of K in Ge4K.

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