Metallurgy Test Questions - Set 1

1)   In metallography, microscopic method provides information about _____

a. impurities in a metal
b. location and extent of segregation
c. uniformity of structure
d. all of the above
Answer  Explanation 

ANSWER: impurities in a metal

Explanation:
No explanation is available for this question!


2)   The study of metallographic includes ____

a. alloy constituents
b. failure analysis
c. metal structure
d. all of the above
Answer  Explanation 

ANSWER: all of the above

Explanation:
No explanation is available for this question!


3)   In microscopy, which illumination parameter is used for producing images with dark non-flat structure and bright back ground?

a. Bright field illumination
b. Dark field illumination
c. Both a. and b.
d. None of the above
Answer  Explanation 

ANSWER: Bright field illumination

Explanation:
No explanation is available for this question!


4)   What is meant by recalescence in cooling curves?

a. Time required for liquefying solid components
b. Time required for completely solidifying the casted components
c. The cooling curve formed due to latent heat of fission
d. Liberated heat increases temperature of an under cooled liquid metal during nucleation
Answer  Explanation 

ANSWER: Liberated heat increases temperature of an under cooled liquid metal during nucleation

Explanation:
No explanation is available for this question!


5)   The cooling curve formed when a material is solidified due to latent heat of fusion is called as ______.

a. Undercooling
b. Solidification
c. Thermal arrest
d. Thermometry
Answer  Explanation 

ANSWER: Thermal arrest

Explanation:
No explanation is available for this question!


6)   Austenite phase in Iron-Carbon equilibrium diagram _______

a. is face centered cubic structure
b. has magnetic phase
c. exists below 727 °C
d. all of the above
Answer  Explanation 

ANSWER: is face centered cubic structure

Explanation:
No explanation is available for this question!


7)   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
Answer  Explanation 

ANSWER: Body centered cubic structure

Explanation:
No explanation is available for this question!


8)   Which of the following phases has a complex orthorhomic crystal structure?

a. δ-ferrite
b. α-ferrite
c. Austenite
d. Cementite
Answer  Explanation 

ANSWER: Cementite

Explanation:
No explanation is available for this question!


9)   In Iron-Carbon equilibrium diagram, at which temperature cementite changes from ferromagnetic to paramagnetic character?

a. 190 °C
b. 210 °C
c. 276 °C
d. None of the above
Answer  Explanation 

ANSWER: 210 °C

Explanation:
No explanation is available for this question!


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 °C, iron is in liquid state

a. 1 and 2
b. 2 and 3
c. 3 and 4
d. All of the above
Answer  Explanation 

ANSWER: 1 and 2

Explanation:
No explanation is available for this question!