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Mechanical Engineering
Strength Of Materials In ME
Quiz 14
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Q.1
For steel, the ultimate strength in shear as compared to in tension is nearly
Same
Half
One third
Two third
Q.2
A tensile test is performed on a mild steel round bar. Its diameter after fracture will
Remain same
Increase
Decrease
Depend upon rate of loading
Q.3
The bending moment diagram for a simply supported beam carrying a uniformly distributed load of ‘w’ per unit length, will be
A horizontal line
A vertical line
An inclined line
A parabolic curve
Q.4
Two shafts 'A' and 'B' are made of same material. The shaft 'A' is solid and has diameter D. The shaft 'B' is hollow with outer diameter D and inner diameter D/2. The strength of hollow shaft in torsion is _________ as that of solid shaft.
1/16
1/8
1/4
15/16
Q.5
The ratio of the largest load in a test to the original cross-sectional area of the test piece is called
Elastic limit
Yield stress
Ultimate stress
Breaking stress
Q.6
For a 25 mm hole drilled in plates, the diameter of rivet shank should be
23 mm
24.5 mm
25 mm
26 mm
Q.7
The given figure shows the Mohr's circle of stress for two unequal and like principal stresses (σx and σy) acting at a body across two mutually perpendicular planes. The resultant stress is given by
OC
OP
OQ
PQ
Q.8
According to Euler's column theory, the crippling load of a column is given by p = π²EI/Cl². In the Euler's formula, the value of C for a column with one end fixed and the other end free, is
1/2
1
2
4
Q.9
A pressure vessel is said to be a thick shell, when
It is made of thick sheets
The internal pressure is very high
The ratio of wall thickness of the vessel to its diameter is less than 1/10.
The ratio of wall thickness of the vessel to its diameter is greater than 1/10.
Q.10
The stress necessary to initiate yielding is
Considerably greater than that necessary to continue it
Considerably lesser than that necessary to continue it
Greater than that necessary to stop it
Lesser than that necessary to stop it
Q.11
A thin cylindrical shell of diameter (d), length (l) and thickness (t) is subjected to an internal pressure (p). The ratio of longitudinal strain to hoop strain is
(m - 2)/(2m - 1)
(2m - 1)/(m - 2)
(m - 2)/(2m + 1)
(2m + 1)/(m - 2)
Q.12
The strength of a riveted joint is equal to the
Pull required to tear off the plate per pitch length (Pt)
Pull required to shear off the rivet per pitch length (Ps)
Pull required to crush the rivet per pitch length (Pc)
Minimum value of Pt, Ps or Pc
Q.13
The safe twisting moment for a compound shaft is equal to the
Maximum calculated value
Minimum calculated value
Mean value
Extreme value
Q.14
Resilience of a material is considered when it is subjected to
Frequent heat treatment
Fatigue
Creep
Shock loading
Q.15
A section of beam is said to be in pure bending, if it is subjected to
Constant bending moment and constant shear force
Constant shear force and zero bending moment
Constant bending moment and zero shear force
None of the above
Q.16
A key is subjected to side pressure as well at shearing forces. These pressures are called
Bearing stresses
Fatigue stresses
Crushing stresses
Resultant stresses
Q.17
A riveted joint in which the number otrivets decrease from innermost to outer most rows is called
Chain riveted joint
Diamond riveted joint
Crisscross riveted joint
Zigzag riveted joint
Q.18
The Poisson's ratio for steel varies from
0.23 to 0.27
0.27 to 0.30
0.31 to 0.34
0.32 to 0.42
Q.19
When a body is subjected to two equal and opposite pulls, as a result of which the body tends to extend its length, the stress and strain induced is
Compressive stress, tensile strain
Tensile stress, compressive strain
Tensile stress, tensile strain
Compressive stress, compressive strain
Q.20
When a body is subjected to two equal and opposite forces, acting tangentially across the resisting section, as a result of which the body tends to shear off across the section, the stress and strain induced is
Tensile stress, tensile strain
Compressive stress, compressive strain
Shear stress, tensile strain
Shear stress, shear strain
Q.21
The ratio of maximum shear stress developed in a rectangular beam and a circular beam of the same cross-sectional area is
2/3
3/4
1
9/8
Q.22
The pull required to tear off the plate per pitch length is (where p = Pitch of rivets, t = Thickness of plates, and σt, τ and σc = Permissible tensile, shearing and crushing stresses respectively)
(p - 2d) t × σc
(p - d) t × τ
(p - d) t × σt
(2p - d) t × σt
Q.23
The torsional rigidity of a shaft is given by
T/J
T/θ
T/r
T/G
Q.24
When a shaft, is subjected to torsion, the shear stress induced in the shaft varies from
Minimum at the center to maximum at the circumference
Maximum at the center to minimum at the circumference
Zero at the center to maximum at the circumference
Maximum at the center to zero at the circumference
Q.25
A thin spherical shell of diameter (d) and thickness (t) is subjected to an internal pressure (p). The stress in the shell material is
pd/t
pd/2t
pd/4t
pd/8t
Q.26
True stress strain-curve for materials is plotted between
Load/original cross-sectional area and change in length/original length
Load/ instantaneous cross-sectional area and loge (original area/ instantaneous area)
Load/ instantaneous cross-sectional area and change in length/ original length
Load/ instantaneous area and instantaneous area/original area
Q.27
When the shear force diagram is a parabolic curve between two points, it indicates that there is a
Point load at the two points
No loading between the two points
Uniformly distributed load between the two points
Uniformly varying load between the two points
Q.28
When there is a sudden increase or decrease in shear force diagram between any two points, it indicates that there is a
Point load at the two points
No loading between the two points
Uniformly distributed load between the two points
Uniformly varying load between the two points
Q.29
A bolt is made to pass through a tube and both of them are tightly fitted with the help of washers and nuts. If the nut is tightened, then
Bolt and tube are under tension
Bolt and tube are under compression
Bolt is under compression and tube is under tension
Bolt is under tension and tube is under compression
Q.30
Modular ratio of the two materials is the ratio of
Linear stress to linear strain
Shear stress to shear strain
Their modulus of elasticities
Their modulus of rigidities
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