91. Impact test enables one to estimate the property of
a) hardness
b) toughness
c) strength
d) creep
Ans: b
92. The phenomenon of decreased resistance of a material to reversal of stress is called
a) creep
b) fatigue
c) resilience
d) plasticity
Ans:
93. The property of metal which allows it to deform continuously at slow rate without any further increase in stress is known as
a) fatigue
b) creep
c) plasticity
d) resilience
Ans: b
94. The stress below which a material has a high probability of not failing under reversal of stress is known as
a) tolerance limit
b) elastic limit
c) proportional limit
d) endurance limit
Ans: b
95. A three hinged parabolic arch rib is acted upon by a single load at the left quarter point. If the central rise is increased and the shape of arch altered to segmental without changing the other details, the horizontal thrust will
a) increase definitely
b) decrease definitely
c) be difficult to predict
d) increase or decrease depending upon the radius of the segmental arch
Ans: b
96. For ductile materials, the most appropriate failure theory is
a) maximum shear stress theory
b) maximum principal stress theory
c) maximum principal strain theory
d) shear strain energy theory
Ans: a
97. At a point in a steel member, the major principal stress is 2000 kg/cm2 and the minor principal stress is compressive. If the uni-axial tensile yield stress is 2500 kg/cm2, then the magnitude of the minor principal stress at which yielding will commence, according to the maximum shearing stress theory, is
a) 1000 kg/cm2
b) 2000 kg/cm2
c) 2500 kg/cm2
d) 500 kg/cm2
Ans: d
98. For the design of a cast iron member, the most appropriate theory of failure is
a) Mohr's theory
b) Rankine's theory
c) Maximum strain theory
d) Maximum shear energy theory
Ans: b
a) hardness
b) toughness
c) strength
d) creep
Ans: b
92. The phenomenon of decreased resistance of a material to reversal of stress is called
a) creep
b) fatigue
c) resilience
d) plasticity
Ans:
93. The property of metal which allows it to deform continuously at slow rate without any further increase in stress is known as
a) fatigue
b) creep
c) plasticity
d) resilience
Ans: b
94. The stress below which a material has a high probability of not failing under reversal of stress is known as
a) tolerance limit
b) elastic limit
c) proportional limit
d) endurance limit
Ans: b
95. A three hinged parabolic arch rib is acted upon by a single load at the left quarter point. If the central rise is increased and the shape of arch altered to segmental without changing the other details, the horizontal thrust will
a) increase definitely
b) decrease definitely
c) be difficult to predict
d) increase or decrease depending upon the radius of the segmental arch
Ans: b
96. For ductile materials, the most appropriate failure theory is
a) maximum shear stress theory
b) maximum principal stress theory
c) maximum principal strain theory
d) shear strain energy theory
Ans: a
97. At a point in a steel member, the major principal stress is 2000 kg/cm2 and the minor principal stress is compressive. If the uni-axial tensile yield stress is 2500 kg/cm2, then the magnitude of the minor principal stress at which yielding will commence, according to the maximum shearing stress theory, is
a) 1000 kg/cm2
b) 2000 kg/cm2
c) 2500 kg/cm2
d) 500 kg/cm2
Ans: d
98. For the design of a cast iron member, the most appropriate theory of failure is
a) Mohr's theory
b) Rankine's theory
c) Maximum strain theory
d) Maximum shear energy theory
Ans: b
No comments:
Post a Comment