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Mechanical Engineering
Strength Of Materials In ME
Quiz 11
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Q.1
In leaf springs, the maximum bending stress developed in the plates is (where W = Load acting on the spring, l = Span of the spring, n = Number of plates, b = Width of plates, and t = Thickness of plates)
Wl/nbt²
3Wl/2nbt²
2Wl/nbt²
3Wl/nbt²
Q.2
The lower layer of the beam as shown in the below figure, will be
In tension
In compression
Neither in tension nor in compression
None of these
Q.3
The total strain energy stored in a body is termed as
Resilience
Proof resilience
Modulus of resilience
Toughness
Q.4
Mohr's circle is used to determine the stresses on an oblique section of a body subjected to
Direct tensile stress in one plane accompanied by a shear stress
Direct tensile stress in two mutually perpendicular directions
Direct tensile stress in two mutually perpendicular directions accompanied by a simple shear stress
All of the above
Q.5
A column of length (l) with both ends fixed may be considered as equivalent to a column of length __________ with both ends hinged.
l/8
l/4
l/2
l/1
Q.6
In a tensile test, near the elastic limit zone, the
Tensile strain increases more quickly
Tensile strain decreases more quickly
Tensile strain increases in proportion to the stress
Tensile strain decreases in proportion to the stress
Q.7
In case of an under-reinforced beam, the depth of actual neutral axis is __________ that of the critical neutral axis.
Same as
Less than
Greater than
None of these
Q.8
When a thin cylindrical shell is subjected to an internal pressure, there will be
A decrease in diameter and length of the shell
An increase in diameter and decrease in length of the shell
A decrease in diameter and increase in length of the shell
An increase in diameter and length of the shell
Q.9
A reinforced cement concrete beam is considered to be made of
Homogeneous material
Heterogeneous material
Composite material
Isotropic material
Q.10
The tensile strength of ductile materials is _________ its compressive strength.
Equal to
Less than
Greater than
None of these
Q.11
The ultimate tensile stress of mild steel compared to ultimate compressive stress is
Same
More
Less
Unpredictable
Q.12
For a beam, as shown in the below figure, the maximum deflection lies at
l/3 from B
l/3 from A
√(l² - a²/3) from B
√(l² - b²/3) from A
Q.13
The pull required to crush the rivet per pitch length is
p.t.σt
d.t.σc
π/4 × d² × σt
π/4 × d² × σc
Q.14
The pull required to shear off a rivet, in double shear, per pitch length is
π/4 × d² × σt
π/4 × d² × τ
π/2 × d² × σt
π/2 × d² × τ
Q.15
The strength of the unriveted or solid plate per pitch length is
d.t.σc
p.t.σt
(p - d) t.σt
π/2 × d² × τ
Q.16
The shear force in the center of a simply supported beam carrying a uniformly distributed load of ‘w’ per unit length, is
Zero
wl²/2
wl²/4
wl²/8
Q.17
The bending moment on a section is maximum where shear force is
Minimum
Maximum
Changing sign
Zero
Q.18
The maximum shear stress, in the given figure, is equal to __________ of the Mohr's circle.
Radius
Diameter
Circumference
Area
Q.19
The stress induced in a body, when suddenly loaded, is _________ the stress induced when the same load is applied gradually.
Equal to
One-half
Twice
Four times
Q.20
The strain energy stored in a body, when suddenly loaded, is __________ the strain energy stored when same load is applied gradually.
Equal to
One-half
Twice
Four times
Q.21
In the above question, the ratio of stiffness of spring 'B' to spring 'A' will be
2
4
6
8
Q.22
Two closely-coiled helical springs 'A' and 'B' of the same material, same number of turns and made from same wire are subjected to an axial load W. The mean diameter of spring 'A' is double the mean diameter of spring 'B'. The ratio of deflections in spring 'B' to spring 'A' will be
1/8
1/4
2
4
Q.23
For a beam, as shown in the below figure, the deflection at C is (where E = Young's modulus for the beam material, and I = Moment of inertia of the beam section.)
Wl³/48 EI
Wa²b²/3EIl
[Wa/(a√3) x EIl] x (l² - a²)^3/2
5Wl³/384 EI
Q.24
The section modulus of a circular section about an axis through its C.G., is
πd²/4
πd²/16
πd3/16
πd3/32
Q.25
The section modulus of a rectangular section about an axis through its C.G., is
b/2
d/2
bd²/2
bd²/6
Q.26
The unit of Young's modulus is
mm/mm
kg/cm
Kg
kg/cm²
Q.27
A shaft revolving at ω rad/s transmits torque (T) in Nm. The power developed is
T.ω watts
2π. T.ω watts
2π. T.ω/75 watts
2π. T.ω/4500 watts
Q.28
In order to avoid sliding of masonry dam, the force of friction between the dam and soil should be at least __________ the total water pressure per meter length.
Equal to
1.5 times
Double
2.5 times
Q.29
The slenderness ratio is the ratio of
Area of column to least radius of gyration
Length of column to least radius of gyration
Least radius of gyration to area of column
Least radius of gyration to length of column
Q.30
The ratio of bulk modulus to Young's modulus for a Poisson's ratio of 0.25 will be
1/3
2/3
1
3/2
0 h : 0 m : 1 s
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