Mechanical Metallurgy Mock Test 7

10%

Question 1 of 10

1. Which of the following structure has the best fatigue property?

Tempered martensite

Bainite

Pearlite

Martensite

Question 1 of 10

Question 2 of 10

2. Find the crack growth per cycle for a steel plate where the crack growth equation is given by:
-> da/dN = A(ΔK)^p
The value of p=3, A= 6.9*10^-18, and stress intensity factor variation is 1 kPa m^1/2.

6.9 m/cycle

6.9 mm/cycle

6.9 nm/cycle

13.3 m/cycle

Question 2 of 10

Question 3 of 10

3. Which of the following material has the highest damping capacity?

Cast iron

Steel

Brass

Stainless steel

Question 3 of 10

Question 4 of 10

4. The infrequent tensile stress ____________ the fatigue life, whereas the infrequent compressive load ____________ fatigue life.

decreases, decreases

Increases, decreases

decrease, increases

increases, increases

Question 4 of 10

Question 5 of 10

5. Which of the following statement is correct?

Fatigue and creep both are transcrystalline

Fatigue is transcrystalline while the creep is intercrystalline

Fatigue is intercrystalline while the creep is transcrystalline

Fatigue and creep both are intercrystalline

Question 5 of 10

Question 6 of 10

6. At any given temperature, the creep will __________ with increasing mean stress.

no relation

decrease

remain the same

increase

Question 6 of 10

Question 7 of 10

7. The idealised shape of the creep curve is given by _________ (at constant stress state)

mechanical-metallurgy-questions-answers-creep-curve-2-q2d

mechanical-metallurgy-questions-answers-creep-curve-2-q2b

mechanical-metallurgy-questions-answers-creep-curve-2-q2c

mechanical-metallurgy-questions-answers-creep-curve-2-q2a

Question 7 of 10

Question 8 of 10

8. The progressive deformation of the material at constant stress is called __________

fracture

creep

fatigue

rupture

Question 8 of 10

Question 9 of 10

9. The fatigue limit of the cast and wrought iron is around ___________ of tensile strength.

90%

10%

50%

Question 9 of 10

Question 10 of 10

10. The steady-state creep (secondary state) has constant creep due to the competing result of the strain hardening and recovery.

False

True

Question 10 of 10