Introduction to Metallurgy MCQ Questions and Answers

71

Fracture stress for a brittle material having a crack lenght of 1μm is 200 MPa. Fracture stress for the same material having a crack lenght of 4 μm is

A) 200 Mpa B) 150MPa C) 100 MPa D) 50 MPa

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Answer & Solution

Answer: Option C

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72

In powder compacting of a monolithic component, it is generally advised to keep the ratio of thickness to width below a limit (say 2.0) this is essentially due to

A) difficulty in ejection of compact leading to breakage B) sidewall friction leading to non-uniform density C) difficulty in sintering D) difficulty in burn off

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Answer & Solution

Answer: Option A

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73

The first alignment step of an AFM is done so that

A) Laser fall on the reflecting part of the cantilever B) Lase reflects and falls at the origin of QPD C) Approach of the tip towards the sample can be done D) Raster scanning of the sample can be started

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Answer & Solution

Answer: Option A

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74

For preparation of porous bearing by powder metallurgy, preferred particle is

A) spherical B) nodular C) irregular D) no preferred shape

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Answer & Solution

Answer: Option D

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75

Which among the following helps us in getting a three-dimensional picture of the specimen?

A) Transmission Electron Microscope B) Scanning Electron Microscope C) Compound Microscope D) Simple Microscope

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Answer & Solution

Answer: Option B

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76

A polymer matrix composite is reinforced with long continuous ceramic fibers aligned in one direction. The young's moduli of the matrix and fibers are Em and Er respectively and the volume fraction of the fibers is f. Assuming iso-stress condition, Young's modulus of the composite Ec in a direction perpendicular to the length of fibers, is given by the expression

A) Ec = (1 - f) E_m + f E_f B) Ec = f Em + (1 - f) Er C) $$\frac{1}{{Ec}} = \frac{{\left( {1 - f} \right)}}{{{E_m}}} + \frac{f}{{Ef}}$$ D) $$\frac{1}{{Ec}} = \frac{f}{{{E_m}}} + \frac{{\left( {1 - f} \right)}}{{Ef}}$$

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Answer & Solution

Answer: Option C

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77

Which of the following is a crystalline solid?

A) PET bottle B) glass mirror C) aluminum cookware D) leather shoe

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Answer & Solution

Answer: Option C

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78

A high cycle fatigue failure is identified by the presence of

A) dimples B) beach marks or striations C) slip lines D) mirror like fractures

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Answer & Solution

Answer: Option B

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79

The intensity of the X-rays depend on . . . . . . . . of materials.

A) atomic weight B) atomic number C) volume electron D) None of these

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Answer & Solution

Answer: Option B

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80

The relation between inter planer spacing(d), lattice parameter and miller indices (hkl)

A) $$n\lambda d = \frac{a}{{\sqrt {{h^2} + {k^2} + {l^2}} }}$$ B) $$\lambda = \frac{d}{{a\sqrt {{h^2} + {k^2} + {l^2}} }}$$ C) $$d = \frac{a}{{\sqrt {{h^2} + {k^2} + {l^2}} }}$$ D) None of these

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Answer & Solution

Answer: Option C

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Introduction to Metallurgy MCQ Questions and Answers | Metallurgical Engineering