1) Which transformation starts after the nucleation of ferrite phase?
a. Bainite transformation
b. Pearlite transformation
c. Both a. and b.
d. None of the above
|
Answer
Explanation
|
ANSWER: Bainite transformation
Explanation:
No explanation is available for this question!
|
|
2) The process of decomposing martensitic structure, by heating martensitic steel below its critical temperature is called as _______
a. Austenitizing
b. Quenching
c. Tempering
d. None of the above
|
Answer
Explanation
|
ANSWER: Tempering
Explanation:
No explanation is available for this question!
|
|
3) Which of the following processes permit the transformation of austenite to martensite, throughout the cross-section of a component without cracking or distortion?
a. Martempering
b. Marquenching
c. Both a. and b.
d. None of the above
|
Answer
Explanation
|
ANSWER: Both a. and b.
Explanation:
No explanation is available for this question!
|
|
4) Which of the following methods measure hardenability of a metal?
a. Brinell hardness method
b. Gross Man's method
c. Rockwell hardness method
d. All of the above
|
Answer
Explanation
|
ANSWER: Gross Man's method
Explanation:
No explanation is available for this question!
|
|
5) In which of the following methods, surface of a steel component becomes hard due to phase transformation austenite to martensite?
a. Carbonitriding
b. Flame hardening
c. Both a. and b.
d. None of the above
|
Answer
Explanation
|
ANSWER: Flame hardening
Explanation:
No explanation is available for this question!
|
|
6) Which of the following phase is obtained as the end product, after complete heat treatment cycle in austempering process?
a. Austenite
b. Bainite
c. Martensite
d. Pearlite
|
Answer
Explanation
|
ANSWER: Bainite
Explanation:
No explanation is available for this question!
|
|
7) Which of the following factors increases hardenability of a metal?
a. Alloying elements
b. Fine grain size
c. Very high carbon content in steel
d. All of the above
|
Answer
Explanation
|
ANSWER: Alloying elements
Explanation:
No explanation is available for this question!
|
|
8) Which carburising method has high production rate?
a. Pack carburising
b. Liquid carburising
c. Gas carburising
d. All of the above
|
Answer
Explanation
|
ANSWER: Gas carburising
Explanation:
No explanation is available for this question!
|
|
9) Which of the following statements is/are false for heat treatment processes?
a. Martempering process is designed to overcome limitations of quenching
b. Pearlite is obtained as the final phase in martempering process
c. Water is used as quenching medium in Jominy end quench test
d. All of the above
|
Answer
Explanation
|
ANSWER: Pearlite is obtained as the final phase in martempering process
Explanation:
No explanation is available for this question!
|
|
10) Which of the following is the last phase obtained after completing heat treatment cycle in patenting process?
a. Bainite
b. Martensite
c. Pearlite
d. None of the above
|
Answer
Explanation
|
ANSWER: Pearlite
Explanation:
No explanation is available for this question!
|
|
