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