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Mechanical Engineering
Strength Of Materials In ME
Quiz 3
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Q.1
When a closely-coiled helical spring is subjected to an axial load, it is said to be under
Bending
Shear
Torsion
Crushing
Q.2
The unit of modulus of elasticity is same as those of
Stress, strain and pressure
Stress, force and modulus of rigidity
Strain, force and pressure
Stress, pressure and modulus of rigidity
Q.3
The bending stress in a beam is _________ section modulus.
Inversely proportional to two times
Directly proportional to
Inversely proportional to
None of these
Q.4
When a cantilever beam is loaded at its free end, the maximum compressive stress shall develop at
Bottom fibre
Top fibre
Neutral axis
Center of gravity
Q.5
The distance between the center of a rivet hole to the nearest edge of plate, is called
Margin
Pitch
Back pitch
Diagonal pitch
Q.6
The property of a material by virtue of which it can be beaten or rolled into plates is called
Malleability
Ductility
Plasticity
Elasticity
Q.7
Which of the following is a proper sequence?
Proportional limit, elastic limit, yielding, failure
Elastic limit, proportional limit, yielding, failure
Yielding, proportional limit, elastic limit, failure
None of the above
Q.8
If the rivets in adjacent rows are staggered and the outermost row has only one rivets, the arrangement of the rivets is called
Chain riveting
Zigzag riveting
Diamond riveting
Crisscross riveting
Q.9
A riveted joint in which every rivet of a row is opposite to other rivet of the outer row, is known as
Chain riveted joint
Diamond riveted joint
Crisscross riveted joint
Zigzag riveted joint
Q.10
When shear force at a point is zero, then bending moment is _________ at that point.
Zero
Minimum
Maximum
Infinity
Q.11
The maximum shear stress is __________ the algebraic difference of maximum and minimum normal stresses.
Equal to
One-fourth
One-half
Twice
Q.12
In a thick cylindrical shell subjected to an internal pressure (p), the tangential stress across the thickness of a cylinder is
Maximum at the outer surface and minimum at the inner surface
Maximum at the inner surface and minimum at the outer surface
Maximum at the outer surface and zero at the inner surface
Maximum at the inner surface and zero at the outer surface
Q.13
In a simply supported beam carrying a uniformly distributed load w per unit length, the point of contraflexure
Lies in the center of the beam
Lies at the ends of the beam
Depends upon the length of beam
Does not exist
Q.14
The shear modulus of most materials with respect to the modulus of elasticity is
Equal to half
Less than half
More than half
None of these
Q.15
The strain energy stored in a body, when the load is gradually applied, is (where σ = Stress in the material of the body, V = Volume of the body, and E = Modulus of elasticity of the material)
σE/V
σV/E
σ²E/2V
σ²V/2E
Q.16
Within elastic limit, stress is
Inversely proportional to strain
Directly proportional to strain
Square root of strain
Equal to strain
Q.17
When a body is subjected to a direct tensile stress (σx) in one plane accompanied by a simple shear stress (τxy), the maximum normal stress is
(σx/2) + (1/2) × √(σx² + 4 τ²xy)
(σx/2) - (1/2) × √(σx² + 4 τ²xy)
(σx/2) + (1/2) × √(σx² - 4 τ²xy)
(1/2) × √(σx² + 4 τ²xy)
Q.18
When a body is subjected to a direct tensile stress (σx) in one plane accompanied by a simple shear stress (τxy), the minimum normal stress is
(σx/2) + (1/2) × √(σx² + 4 τ²xy)
(σx/2) - (1/2) × √(σx² + 4 τ²xy)
(σx/2) + (1/2) × √(σx² - 4 τ²xy)
(1/2) × √(σx² + 4 τ²xy)
Q.19
The thermal or temperature stress is a function of
Increase in temperature
Modulus of elasticity
Coefficient of linear expansion
All of these
Q.20
When a body is subjected to biaxial stress i.e. direct stresses (σx) and (σy) in two mutually perpendicular planes accompanied by a simple shear stress (τxy), then maximum normal stress is
(σx + σy)/2 + (1/2) × √[(σx - σy)² + 4 τ²xy]
(σx + σy)/2 - (1/2) × √[(σx - σy)² + 4 τ²xy]
(σx - σy)/2 + (1/2) × √[(σx + σy)² + 4 τ²xy]
(σx - σy)/2 - (1/2) × √[(σx + σy)² + 4 τ²xy]
Q.21
When a body is subjected to biaxial stress i.e. direct stresses (σx) and (σy) in two mutually perpendicular planes accompanied by a simple shear stress (τxy), then minimum normal stress is
(σx + σy)/2 + (1/2) × √[(σx - σy)² + 4 τ²xy]
(σx + σy)/2 - (1/2) × √[(σx - σy)² + 4 τ²xy]
(σx - σy)/2 + (1/2) × √[(σx + σy)² + 4 τ²xy]
(σx - σy)/2 - (1/2) × √[(σx + σy)² + 4 τ²xy]
Q.22
The point of contraflexure is a point where
Shear force changes sign
Bending moment changes sign
Shear force is maximum
Bending moment is maximum
Q.23
The point of contra flexure is a point where
Shear force changes sign
Shear force is maximum
Bending moment changes sign
Bending moment is maximum
Q.24
A material obeys hook’s law up to
Plastic limit
Elastic limit
Yield point
Limit of proportionality
Q.25
Which of the following materials is most elastic?
Rubber
Plastic
Brass
Steel
Q.26
The deformation per unit length is called
Tensile stress
Compressive stress
Shear stress
Strain
Q.27
A non yielding support implies that the
Support is frictionless
Support can take any amount of reaction
Support holds member firmly
Slope of the beam at the support is zero
Q.28
The bending moment diagram for a simply supported beam loaded in its center is
A right angled triangle
An isosceles triangle
An equilateral triangle
A rectangle
Q.29
The unit of stress in S.I. units is
N/mm²
kN/mm²
N/m²
Any one of these
Q.30
If the section modulus of a beam is increased, the bending stress in the beam will
Not change
Increase
Decrease
None of these
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