Mechanical Metallurgy Mock Test 4

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Question 1 of 10

1. The maximum stress on the tip of the crack of length 2c and radius of curvature of the tip ρ_t is given as ____

σ_max=$σ[2(\frac{c}{ρt})^{1/2}]$

σ_max=$σ[1+2(\frac{c}{ρt})^{1/2}]$

σ_max=$σ[(\frac{c}{ρt})^{1/2}]$

σ_max=$σ[1+(\frac{c}{ρt})^{1/2}]$

Question 1 of 10

Question 2 of 10

2. For the given component the critical resolved shear stress will be equal to _________
Given that the load applied is equal to P and the normal and shear angle with loading directions are θ and λ.
$mechanical-metallurgy-questions-answers-griffith-theory-brittle-fracture-1-q2$

(P/A)*cosλ*cosθ

(P/A)*cosθ²

P/A

P*cosθ

Question 2 of 10

Question 3 of 10

3. Increasing temperature will lower the rate of strain hardening.

True

False

Question 3 of 10

Question 4 of 10

4. The Resilience is not equal to ____________
Where; σ-is yield stress, e-strain, E-young’s modulus

1/2*σ²/E

1/2*E*e²

1/2*σ*e

1/2*σ²/e

Question 4 of 10

Question 5 of 10

5. Which is the most important property used in the rolling process?

Resilience

Toughness

Hardness

Ductility

Question 5 of 10

Question 6 of 10

6. The ductility of true strain values _____________ with increase in second phase particles.

increases

decrease

no relationship

remains constant

Question 6 of 10

Question 7 of 10

7. The formation of necking produces the state of _________________

pure shear stress

biaxial stress

uniaxial stress

triaxle stress

Question 7 of 10

Question 8 of 10

8. The hydrostatic compressive state of stress __________ the fracture strength of the material.

no relationship

increases

does not alter

decreases

Question 8 of 10

Question 9 of 10

9. Which of the following parameter is used as designing material of components?

Proof stress

True elastic limit

Propositional limit

Elastic limit

Question 9 of 10

Question 10 of 10

10. The brittle fracture is not observed in ___________

HCP

FCC

BCC

Question 10 of 10