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Mechanical Engineering
Strength Of Materials In ME
Quiz 9
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Q.1
The point of contraflexure occurs in
Cantilever beams
Simply supported beams
Overhanging beams
Fixed beams
Q.2
The shear force at the ends of a simply supported beam carrying a uniformly distributed load of w per unit length is
Zero at its both ends
wl at one end and -wl at the other end
wl/2 at one end and -wl/ 2 at the other end
wl²/2 at one end and -wl²/ 2 at the other end
Q.3
Proof resilience per material is known as
Resilience
Proof resilience
Modulus of resilience
Toughness
Q.4
The maximum diameter of the hole that can be punched from a plate of maximum shear stress 1/4th of its maximum crushing stress of punch, is equal to (where t = Thickness of the plate)
1t
2t
4t
8t
Q.5
The bending moment at a section tends to bend or deflect the beam and the internal stresses resist its bending. The resistance offered by the internal stresses, to the bending, is called
Compressive stress
Shear stress
Bending stress
Elastic modulus
Q.6
The stress developed in the material without any permanent set is called
Elastic limit
Yield stress
Ultimate stress
Breaking stress
Q.7
The maximum bending moment of a simply supported beam of span l and carrying a point load W at the center of beam, is
Wl/4
Wl/2
Wl
Wl²/4
Q.8
According to Euler's column theory, the crippling load for a column of length (l) with one end fixed and the other end hinged, is
π²EI/l²
π²EI/4l²
2π²EI/l²
4π²EI/l²
Q.9
The ratio of elongation in a prismatic bar due to its own weight (W) as compared to another similar bar carrying an additional weight (W) will be
1 : 2
1 : 3
1 : 4
1 : 2.5
Q.10
Which of the following statement is correct?
The energy stored in a body, when strained within elastic limit is known as strain energy.
The maximum strain energy which can be stored in a body is termed as proof resilience.
The proof resilience per unit volume of a material is known as modulus of resilience.
All of the above
Q.11
Which of the following statement is correct?
A continuous beam has only two supports at the ends.
A uniformly distributed load spreads uniformly over the whole length of a beam.
The bending moment is maximum where shear force is maximum.
The maximum bending moment of a simply supported beam of length l with a central point load W is Wl/8.
Q.12
Which of the following statement is correct?
The size of hole drilled in riveting plates is less than the actual size of rivet.
The center to center distance between two consecutive rivets in a row is called margin.
Rivets are generally specified by its shank diameter.
Tearing of plates can be avoided by taking the pitch of rivets equal to 1.5 times the diameter of rivet hole.
Q.13
Which of the following statement is correct?
The stress is the pressure per unit area
The strain is expressed in mm
Hook's law holds good up to the breaking point
Stress is directly proportional to strain within elastic limit
Q.14
The maximum deflection of a fixed beam of length ‘l’ carrying a total load ‘W’ uniformly distributed over the whole length is
Wl3/48EI
Wl3/96EI
Wl3/192EI
Wl3/384EI
Q.15
Two beams, one of circular cross-section and the other of square cross-section, have equal areas of cross-sections. When these beams are subjected to bending,
Both beams are equally economical
Square beam is more economical
Circular beam is more economical
None of these
Q.16
In a belt drive, the pulley diameter is doubled, the belt tension and pulley width remaining same. The changes required in key will be
Increase key length
Increase key depth
Increase key width
Double all the dimensions
Q.17
In a tensile test, when the material is stressed beyond elastic limit, the tensile strain __________ as compared to the stress.
Decreases slowly
Increases slowly
Decreases more quickly
Increases more quickly
Q.18
A beam which is fixed at one end and free at the other is called
Simply supported beam
Fixed beam
Overhanging beam
Cantilever beam
Q.19
The strain energy stored in a solid circular shaft subjected to shear stress (τ), is:
(Where, G = Modulus of rigidity for the shaft material)
τ²/ 2G × Volume of shaft
τ/ 2G × Volume of shaft
τ²/ 4G × Volume of shaft
τ/ 4G × Volume of shaft
Q.20
The strain energy stored in a solid circular shaft in torsion, subjected to shear stress (τ), is:
(Where, G = Modulus of rigidity for the shaft material)
τ²/ 2G × Volume of shaft
τ/ 2G × Volume of shaft
τ²/ 4G × Volume of shaft
τ/ 4G × Volume of shaft
Q.21
At the neutral axis of a beam, the shear stress is
Zero
Minimum
Maximum
Infinity
Q.22
Percentage reduction of area in performing tensile test on cast iron may be of the order of
50%
25%
0%
15%
Q.23
Principle plane is a plane on which the shear stress is
Zero
Minimum
Maximum
None of these
Q.24
A thick cylindrical shell having ro and ri as outer and inner radii, is subjected to an internal pressure (p). The maximum tangential stress at the inner surface of the shell is
(ro² - ri²)/ 2p ri²
2p ri²/ (ro² - ri²)
p (ro² + ri²)/ (ro² - ri²)
p (ro² - ri²)/ (ro² + ri²)
Q.25
In a thick cylindrical shell subjected to an internal pressure (p), the maximum radial stress at the inner surface of the shell is
Zero
p (tensile)
-p (compressive)
2p (tensile)
Q.26
The assumption, generally, made in the theory of simple bending is that
The beam material is perfectly homogeneous and isotropic
The beam material is stressed within its elastic limit
The plane sections before bending remain plane after bending
All of the above
Q.27
A thick cylindrical shell having r₀ and ri as outer and inner radii, is subjected to an internal pressure (p). The maximum tangential stress at the inner surface of the shell is
[p (r₀² + ri²)] / (r₀² - ri²)
[p (r₀² - ri²)] / (r₀² + ri²)
2pri²/ (r₀² - ri²)
(r₀² - ri²) / 2pri²
Q.28
The thermal stress in a bar is __________ proportional to the change in temperature.
Directly
Indirectly
Both A and B
None of these
Q.29
A column of length (l) with both ends fixed may be considered as equivalent to a column of length __________ with one end fixed and the other end free.
l/8
l/4
l/2
l/1
Q.30
Percentage reduction in area performing tensile test on cast iron may be of the order of
50%
25%
20%
30%
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