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Strength of Materials
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Strain energy is the
proof resilience per unit volume of a material
energy stored in a body when strained within elastic limits
energy stored in a body when strained upto the breaking of a specimen
maximum strain energy which can be stored in a body
The buckling load for a given column depends upon
All of the above
length and least radius of gyration of the column
area of cross-section of the column
modulus of elasticity for the material of the column
A three hinged arch is loaded with an isolated load 1000 kg at a horizontal distance of 2.5 m from the crown, 1 m above the level of hinges at the supports 10 metresapart.
The horizontal thrust is
2500 kg
125 kg
1250 kg
750 kg
2325 kg.
In case of eccentrically loaded struts __________ is preferred
reinforced section
composite section
hollow section
solid section
If all the dimensions of a bar are increased in the proportion n : 1, the proportion with which the maximum stress produced in the prismatic bar by its own weight, will increase in the ratio
N : 1
1 : n.
: 1
1 : n
1 :
A double strap butt joint with equal straps is
either in single shear or double shear
always in single shear
NONE OF THESE
always in double shear
For a 25 mm hole drilled in plates, the diameter of rivet shank should be
26mm
23mm
25mm
24.5mm
The materials which have the same elastic properties in all directions, are called
hard.
homogeneous
Isotropic
Brittle
The relation between equivalent length (L) and actual length (l) of a column for both ends fixed is
L = l
l = 2L
L = l/2
Rivets are generally specified by
diameter of head
thickness of plates to be joined
shank diameter
overall length
A joint of a frame is subjected to three tensile force P, Q and R equally inclined to eachother.
If P is 10 tonnes, the other forces will be
R + 10 tonnes and Q = zero
Q = 10 tonnes and R = zero
Q and R each is equal to 10 tonnes.
Q + R = 10 tonnes
Q - R = zero
If the depth is kept constant for a beam of uniform strength, then its width will vary in proportional to (where M = Bending moment)
M
M3
M2
A column is said to be of medium size if its slenderness ratio is between
20 and 32
120 and 160
32 and 120
180 and 200
160 and 180
The design of thin cylindrical shells is based on
hoop stress
longitudinal stress
geometric mean of the hoop and longitudinal stress
arithmetic mean of the hoop and the longitudinal stress
The deflection of any rectangular beam simply supported, is
directly proportional to its weight
None of these.
inversely proportional to its width
directly proportional to the cube of its length
inversely proportional to the cube of its depth
A cast iron T section beam is subjected to purebending.
For maximum compressive stress to be three times the maximum tensile stress, centre of gravity of the section from flange side is
2/3 h.
h/3
h/2
H/4
The maximum resistance against rotation, is offered by the weld at a point
centrally located.
at either end
most distant
least distant
When a body is subjected to three mutually perpendicular stresses, of equal intensity, the ratio of direct stress to the corresponding volumetric strain is known as
modulus of rigidity
bulk modulus
Young's modulus
Poisson's ratio
The force in DB of the truss shown in below figure is
2 W compression
W tension
5 W tension
3 W compression
4 W tension.
In a tensile test, when the material is stressed beyond elastic limit, the tensile strain __________ as compared to the stress
decreases slowly
increases slowly
increases more quickly
decreases more quickly
1
2
12
23
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