Miscellaneous in Metallurgy MCQ Questions and Answers

61

When a half plane is inserted between two perfect planes then the defect arises in two plane perpendiculars to each other is called

A) Edge dislocations B) Screw dislocations C) Mixed dislocations D) All are correct

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Answer & Solution

Answer: Option B

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62

The heat treatment process in which heating of steel is done to a temperature above the A₃ temperature and it between 1000 - 1200°C and hold is for long time 10-20hr and followed by cooling is called

A) diffusion annealing B) Process annealing C) Full annealing D) subcritical annealing

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Answer: Option A

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63

A large set of data for a given measurement has been found to be normally distributed around a mean 'μ' with standard deviation 'σ'. Which of the following limits would have about 95% of the data points around the mean and rest outside?

A) μ - 0.5σ and μ + 0.5σ B) μ - σ and μ + σ C) μ - 2σ and μ + 2σ D) μ - 3σ and μ + 3σ

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Answer: Option C

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64

Two identical engineering components are made from alloys X and Y. The K_IC of alloy X is greater than that of alloy Y. If these components are subjected to the same stress during operation under mode-I loading, which one of the following statements is true?

A) Component made from alloy X can tolerate a larger flaw size compared to that made from Y B) Component made from alloy Y can tolerate a larger flaw size compared to that made from X C) Both can tolerate same flaw size D) None of the above

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Answer: Option A

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65

Cork is a good insulator because

A) It is flexible B) It can be powdered C) Low density D) It is porous

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Answer & Solution

Answer: Option D

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66

Kevlar is commercial name for

A) Glass fibers B) Carbon fibers C) Aramid fibers D) Cermets

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Answer & Solution

Answer: Option C

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67

For a steady state two dimensional in-compressible flow of liquid iron, the x component of the velocity is given by μ = 5xy² - xy where x and y are rectangular co-ordinates.
Using the continuity equation, the y component of the velocity would be

A) 5y - y² B) $$\frac{{{y^2}}}{3}$$ 2.5y² + C where C is an arbitrary constant C) y³ - 5y + C where C is an arbitrary constant D) $$\frac{{{y^2}}}{3}$$ - 5y²

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Answer & Solution

Answer: Option A

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68

The Kelvin is converted into Celsius

A) $$F = \frac{{19}}{5} \times C + 31$$ B) $$F = \frac{{19}}{5} \times C + 32$$ C) $$C = K{\text{ - }}273$$ D) $$F = \frac{9}{{15}} \times C + 32$$

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Answer: Option C

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69

The two surfaces of a 5 mm thick plate of carbon steel are maintained at a carbon concentration of 10⁴ mol. m^-3 on one side and zero concentration on the other side. Taking the diffusion coefficient of carbon in austenite to be 10^-11 m^-2.s^-1, the steady state flux (mol.m^-3.s^-1) through the thickness of the steel is

A) 10^-5 B) 2 × 10^-5 C) 4 × 10^-5 D) 6 × 10^-5

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Answer & Solution

Answer: Option B

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70

A cylindrical rod subjected to a tensile strain within the elastic limit undergoes a volume change. If the volume strain is equal to half the applied tensile strain then the poisson's ratio of the rod is

A) 0 B) 0.33 C) 0.44 D) 0.25

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Answer: Option C

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Miscellaneous in Metallurgy MCQ Questions and Answers | Metallurgical Engineering