Materials Science Mock Test 8

10%

Question 1 of 10

1. From the following figure if blue curve represent growth rate what does red and green curve represent respectively?

Nucleation rate, finer grain size

Over all transformation rate, Nucleation rate

Over all transformation rate, finer grain size

Nucleation rate, over all transformation rate

Question 1 of 10

Question 2 of 10

2. For binary alloy consisting of three phases of non – equilibrium one, What will be the temperature of these phases?

Different

Two of them will be with one temperature

Same

Constant

Question 2 of 10

Question 3 of 10

3. When α, L and β phase fields touch the isotherm line what are the respective phase compositions?

8.0 wt%, 91.2 wt%, 71.9 wt% of Ag

91.2 wt%, 8.0 wt%, 71.9 wt% of Ag

8.0 wt%, 71.9 wt%, 91.2 wt% of Ag

71.9 wt%, 91.2 wt%, 8.0 wt% of Ag

Question 3 of 10

Question 4 of 10

4. What is the eutectoid structure of Iron?

Austentite

Cementite

Pearlite

Ferrite

Question 4 of 10

Question 5 of 10

5. Which of the following phase will be resulted when the transformation temperature of steel is more than 750 °C?

Austenite

Bainite

Pearlite

Martensite

Question 5 of 10

Question 6 of 10

6. Compositions above 2.1% C is called as _______

Ferrite

Cast iron

Hyper and Hypoeutectoid steel

Ledeburite

Question 6 of 10

Question 7 of 10

7. What is the hardest phase of Fe-C system?

Bainite

Cementite

Graphite

Martensite

Question 7 of 10

Question 8 of 10

8. From the following figure if Diffusion rates below Ms is so low that γ → M transformation is a diffusionless process then what is change in crystal structure

BCT → BCC

FCC → BCT

FCC → BCC

BCC → BCT

Question 8 of 10

Question 9 of 10

9. What is degree of freedom when two phases co - exist?

Question 9 of 10

Question 10 of 10

10. What is the % C content in Cementite (Fe₃C)?

6.67%

0.09%

2.1%

0.025%

Question 10 of 10