71. In tensile stress, the engineering stress corresponding to the maximum load is termed as:
(a) Upper yield stress
(b) Lower yield stress
(c) Yield strength
(d) Tensile strength
(b) Lower yield stress
(c) Yield strength
(d) Tensile strength
Answer: (d)
72. Ductile-Brittle transition temperature for steel depends on:
(a) Strain rate
(b) Tensile strength
(c) Grain size
(d) Shear modulus
(a) Strain rate
(b) Tensile strength
(c) Grain size
(d) Shear modulus
Answer: (c)
73. The property of materials that resist penetration or indentation by means of abrasion or scratching is known as:
(a) Strength
(b) Toughness
(c) Hardness
(d) Brittleness
(a) Strength
(b) Toughness
(c) Hardness
(d) Brittleness
Answer: (c)
74. The crime that is committed by either commission or omission is:
(a) Employee crime
(b) White collar crime
(c) Embezzlement and fraud
(d) Trade secrets
(a) Employee crime
(b) White collar crime
(c) Embezzlement and fraud
(d) Trade secrets
Answer: (c)
75. An equillibrium defect in which Frenkel and Schottky defects are likely to form:
(a) Vacancies
(b) Dislocations
(c) Stacking faults
(d) Grain boundaries
(a) Vacancies
(b) Dislocations
(c) Stacking faults
(d) Grain boundaries
Answer: (a)
76. Which one of the following Crystal Systems is having an Interaxial Angles of 𝛼=𝛾=90°≠𝛽?
(a) Hexagonal
(b) Tetragonal
(c) Rhombohedral
(d) Monoclinic
(a) Hexagonal
(b) Tetragonal
(c) Rhombohedral
(d) Monoclinic
Answer: (d)
77.
Answer: (c)
78. For a binary system, when 3 phases are present, the number of degrees of freedom will be:
(a) 0
(b) 1
(c) 2
(d) 3
(a) 0
(b) 1
(c) 2
(d) 3
Answer: (a)
79. A 305 mm long copper piece is pulled in tension with a stress of 276 MPa and with its modulus of elasticity E of 110 GPa . If the deformation is entirely elastic, the resultant elongation will be:
(a) 0.45 mm
(b) 0.57 mm
(c) 0.65 mm
(d) 0.77 mm
(a) 0.45 mm
(b) 0.57 mm
(c) 0.65 mm
(d) 0.77 mm
Answer: (d)
80. Which one of the following factors affects the selection of materials regarding ‘thermal conductivity’?
(a) Manufacturing process
(b) Functional requirement
(c) Cost consideration
(d) Operating parameter
(a) Manufacturing process
(b) Functional requirement
(c) Cost consideration
(d) Operating parameter
Answer: (b)