1) Which of the following neutral elements neither form carbides nor cause graphitization?
a. Aluminium
b. Chromium
c. Cobalt
d. Copper
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Answer
Explanation
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ANSWER: Cobalt
Explanation:
No explanation is available for this question!
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2) Austenite phase in Iron-Carbon equilibrium diagram _______
a. is face centered cubic structure
b. has magnetic phase
c. exists below 727 oC
d. all of the above
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Answer
Explanation
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ANSWER: is face centered cubic structure
Explanation:
No explanation is available for this question!
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3) What is the crystal structure of δ-ferrite?
a. Body centered cubic structure
b. Face centered cubic structure
c. Orthorhomic crystal structure
d. None of the above
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Answer
Explanation
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ANSWER: Body centered cubic structure
Explanation:
No explanation is available for this question!
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4) Which of the following phases has a complex orthorhomic crystal structure?
a. δ-ferrite
b. α-ferrite
c. Austenite
d. Cementite
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Answer
Explanation
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ANSWER: Cementite
Explanation:
No explanation is available for this question!
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5) In Iron-Carbon equilibrium diagram, at which temperature cementite changes from ferromagnetic to paramagnetic character?
a. 190 oC
b. 210 oC
c. 276 oC
d. None of the above
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Answer
Explanation
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ANSWER: 210 oC
Explanation:
No explanation is available for this question!
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6) Eutectoid steel contains _____
a. 0.4 % Carbon
b. 0.8 % Carbon
c. 1.2 % Carbon
d. 2.2 % Carbon
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Answer
Explanation
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ANSWER: 0.8 % Carbon
Explanation:
No explanation is available for this question!
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7) The mixture of α-ferrite and cementite is called as _______
a. Ledeburite
b. Pearlite
c. Both a. and b.
d. None of the above
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Answer
Explanation
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ANSWER: Pearlite
Explanation:
No explanation is available for this question!
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8) Which of the following alloying elements prevent formation of austenite in high chromium steels?
a. Boron
b. Carbon
c. Manganese
d. Titanium
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Answer
Explanation
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ANSWER: Titanium
Explanation:
No explanation is available for this question!
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9) Which of the following alloying elements are deoxidizers?
a. Aluminium
b. Silicon
c. Both a. and b.
d. None of the above
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Answer
Explanation
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ANSWER: Both a. and b.
Explanation:
No explanation is available for this question!
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10) Which of the following statements is/are true about Iron in Iron-Carbon equilibrium diagram ?
1. It is soft and ductile
2. It is allotropic in nature
3. It is magnetic above curie temperature
4. Below the temperature of 1539 oC, iron is in liquid state
a. 1 and 2
b. 2 and 3
c. 3 and 4
d. All of the above
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Answer
Explanation
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ANSWER: 1 and 2
Explanation:
No explanation is available for this question!
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