Quiz On Phase Diagrams

35 Questions | By Ahmad_Saif | Updated: Mar 22, 2022 | Attempts: 360

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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.