Engineering Materials MCQ Questions & Answers | Mechanical Engineering Page-8 section-3

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71.
Which of the following material has maximum ductility?

A. Mild steel

B. Copper

C. Nickel

D. Aluminium

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72.
The ability of a material to resist softening at high temperature is known as

A. Creep

B. Hot tempering

C. Hot hardness

D. Fatigue

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73.
The defect which takes place due to imperfect packing of atoms during crystallization is known as

A. Line defect

B. Surface defect

C. Point defect

D. None of these

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74.
The alloy used for making electrical resistances and heating elements is

A. Nichrome

B. Invar

C. Magnin

D. Elinvar

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75.
The strength is the ability of a material to resist

A. Deformation under stress

B. Externally applied forces with breakdown or yielding

C. Fracture due to high impact loads

D. None of these

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76.
The stiffness is the ability of a material to resist

A. Deformation under stress

B. Fracture due to high impact loads

C. Externally applied forces with breakdown or yielding

D. None of the above

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77.
Which of the following statement is wrong?

A. Steel with 0.8% carbon is wholly pearlite

B. The amount of cementite increases with the increase in percentage of carbon in iron

C. A mechanical mixture of 87% cementite and 13% ferrite is called pearlite

D. The cementite is identified as round particles in the structure

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78.
Delta iron occurs at temperature of

A. Room temperature

B. Above melting point

C. Between 1400°C and 1539°C

D. Between 910°C and 1400°C

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79.
Which of the following elements does not impart hardness to steel?

A. Copper

B. Chromium

C. Nickel

D. Silicon

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80.
The steel widely used for motor car crankshafts is

A. Nickel steel

B. Chrome steel

C. Nickel-chrome steel

D. Silicon steel

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Engineering Materials MCQ Questions & Answers | Mechanical Engineering

71. Which of the following material has maximum ductility?

Answer & Solution

72. The ability of a material to resist softening at high temperature is known as

Answer & Solution

73. The defect which takes place due to imperfect packing of atoms during crystallization is known as

Answer & Solution

74. The alloy used for making electrical resistances and heating elements is

Answer & Solution

75. The strength is the ability of a material to resist

Answer & Solution

76. The stiffness is the ability of a material to resist

Answer & Solution

77. Which of the following statement is wrong?

Answer & Solution

78. Delta iron occurs at temperature of

Answer & Solution

79. Which of the following elements does not impart hardness to steel?

Answer & Solution

80. The steel widely used for motor car crankshafts is

Answer & Solution

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71.
Which of the following material has maximum ductility?

72.
The ability of a material to resist softening at high temperature is known as

73.
The defect which takes place due to imperfect packing of atoms during crystallization is known as

74.
The alloy used for making electrical resistances and heating elements is

75.
The strength is the ability of a material to resist

76.
The stiffness is the ability of a material to resist

77.
Which of the following statement is wrong?

78.
Delta iron occurs at temperature of

79.
Which of the following elements does not impart hardness to steel?

80.
The steel widely used for motor car crankshafts is