Mechanical Metallurgy Mock Test 5

10%

Question 1 of 10

1. For the given specimen the necking will begin when the true strain will be equal to __________

Question 1 of 10

Question 2 of 10

2. How is Brinell hardness measured?

Using an indentation profile which will be checked in a microscope for indentation diameter

By checking the deformation of the ball

Using a dial gauge showing hardness reading

The graph obtained from machine showing hardness

Question 2 of 10

Question 3 of 10

3. Hardness of most metals fall in the range of __________ in Mohr’s scale.

3-6

4-8

7-10

1-3

Question 3 of 10

Question 4 of 10

4. To maintain the constant true strain rate of a sample, the crosshead velocity should increase with the increase in the length of the specimen. What will be the optimum velocity with the change in length to keep the true strain rate constant? (True strain rate=ϒ, L=length of sample, t=time).

v=ϒ

v=ϒ*L

v=ϒ*L*exp(ϒt)

v=ϒ*L*exp(ϒ/t)

Question 4 of 10

Question 5 of 10

5. The minor load in the Rockwell hardness measurement is generally equal to ___________

10 kg

150 kg

20 kg

50 kg

Question 5 of 10

Question 6 of 10

6. The true local necking strain is defined as __________

strain from tensile strength point to the failure point

strain up to yield point

strain up to the failure point

strain required up to maximum tensile strength point

Question 6 of 10

Question 7 of 10

7. The low carbon steel does not show yield point phenomena, but if the strain rate is sufficiently high, the yield point might appear in the flow curve.

True

False

Question 7 of 10

Question 8 of 10

8. The shape of Knoop indenter is of ___________

pyramid with major and minor diagonal

square-based pyramid

pyramid with a rounded end

rounded end tip

Question 8 of 10

Question 9 of 10

9. The Rockwell hardness number unit is equal to __________

kg/mm²

kg/mm

kg-mm²

unit less

Question 9 of 10

Question 10 of 10

10. The indenter used in the Vicker’s hardness tester is _______________

square-base diamond pyramid

square-base flat-pyramid

steel ball with 10mm diameter

steel ball with 1.6 mm diameter

Question 10 of 10