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Strength of Materials
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Strain energy is the
proof resilience per unit volume of a material
maximum strain energy which can be stored in a body
energy stored in a body when strained within elastic limits
energy stored in a body when strained upto the breaking of a specimen
The buckling load for a given column depends upon
modulus of elasticity for the material of the column
area of cross-section of the column
length and least radius of gyration of the column
All of the above
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
1250 kg
2500 kg
125 kg
750 kg
2325 kg.
In case of eccentrically loaded struts __________ is preferred
reinforced section
hollow section
solid section
composite 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
: 1
N : 1
1 : n.
1 : n
1 :
A double strap butt joint with equal straps is
NONE OF THESE
always in double shear
always in single shear
either in single shear or double shear
For a 25 mm hole drilled in plates, the diameter of rivet shank should be
25mm
24.5mm
26mm
23mm
The materials which have the same elastic properties in all directions, are called
Isotropic
hard.
homogeneous
Brittle
The relation between equivalent length (L) and actual length (l) of a column for both ends fixed is
l = 2L
L = l
L = l/2
Rivets are generally specified by
thickness of plates to be joined
overall length
shank diameter
diameter of head
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 + R = 10 tonnes
Q and R each is equal to 10 tonnes.
Q = 10 tonnes and R = zero
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)
M3
M
M2
A column is said to be of medium size if its slenderness ratio is between
160 and 180
32 and 120
180 and 200
120 and 160
20 and 32
The design of thin cylindrical shells is based on
arithmetic mean of the hoop and the longitudinal stress
longitudinal stress
geometric mean of the hoop and longitudinal stress
hoop stress
The deflection of any rectangular beam simply supported, is
directly proportional to the cube of its length
None of these.
directly proportional to its weight
inversely proportional to its width
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/4
h/3
h/2
The maximum resistance against rotation, is offered by the weld at a point
centrally located.
at either end
least distant
most 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
5 W tension
3 W compression
W tension
4 W tension.
In a tensile test, when the material is stressed beyond elastic limit, the tensile strain __________ as compared to the stress
increases slowly
increases more quickly
decreases slowly
decreases more quickly
1
2
12
23
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