Virtual Labs

1.Given different samples are cold rolled to x % deformation; Sample A: 20 %, Sample B: 30 %, Sample C: 40 %, Sample D: 50 %. Which of the following is correct?

a: % elongation of A < % elongation of B Explanation

Explanation

b: Yield Strength of C > Yield Strength of D Explanation

Explanation

c: Tensile Strength of D > Tensile Strength of A Explanation

Explanation

d: Elastic modulus of D > Elastic modulus of C Explanation

Explanation

2.Which of the following statements is incorrect w.r.t. strain hardening?

a: It is related to the elastic deformation Explanation

Explanation

b: Dislocation multiplication Explanation

Explanation

c: Dislocations strain field interaction Explanation

Explanation

d: Motion of dislocation is hindered by the presence of other dislocations Explanation

Explanation

3.Which of the following decreases due to strain hardening?

a: Yield strength Explanation

Explanation

b: Hardness Explanation

Explanation

c: Ductility (% elongation or strain to failure) Explanation

Explanation

d: Ultimate tensile strength Explanation

Explanation

4.Consider an aluminum plate has been subjected to 20 % cold rolling. Rectangular Tensile specimens (thickness: 5 mm and width: 10 mm) were cut from the rolled plate and then subjected to tensile test. If the load at yield point is 1000 N, what would be the yield strength?

a: 500 MPa Explanation

Explanation

b: 20 MPa Explanation

Explanation

c: 10 MPa Explanation

Explanation

d: 50 MPa Explanation

Explanation

5.The temperature below which cold working of metal is carried out is called:?

a: Room temperature Explanation

Explanation

b: Melting temperature Explanation

Explanation

c: Below room temperature Explanation

Explanation

d: Recrystallization temperature Explanation

Explanation

6.Which of the following cannot be used for work hardening?

a: Heating the specimen Explanation

Explanation

b: Cold rolling Explanation

Explanation

c: Hammering Explanation

Explanation

d: Cold forging Explanation

Explanation

Strain and Work Hardening in Materials