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Quiz 4
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Q.1
A compound truss may be formed by connecting two simple rigid frames, by
Two bars
Three bars
Three parallel bars
Three bars intersecting at a point
Q.2
For beams breadth is constant,
Depth d M
Depth d 3
Depth d
Depth d 1/M
Q.3
The ratio of the length and diameter of a simply supported uniform circular beam which experiences maximum bending stress equal to tensile stress due to same load at its mid span, is
1/8
1/4
1/2
1/3
Q.4
a uniform circular bar of diameter d and length , which extends by an The deflection of amount under a tensile pull , when it carries the same load at its mid-span, is
el/2d
e²l/3d²
el²/3d²
e²l²/3d²
Q.5
Principal planes are subjected to
Normal stresses only
Tangential stresses only
Normal stresses as well as tangential stresses
None of these
Q.6
Y are the bending moment, moment of inertia, radius of curvature, modulus of If M, I, R, E, F, and elasticity stress and the depth of the neutral axis at section, then
M/I = R/E = F/Y
I/M = R/E = F/Y
M/I = E/R = F/Y
M/I = E/R = Y/F
Q.7
A square column carries a load P at the centroid of one of the quarters of the square. If a is the side of the main square, the combined bending stress will be
p/a²
2p/a²
3p/a²
4p/a²
Q.8
The eccentricity (e) of a hollow circular column, external diameter 25 cm, internal diameter 15 cm for an eccentric load 100 t for non-development of tension, is
2.75 cm
3.00 cm
3.50 cm
4.25 cm
Q.9
The vertical reaction for the arch is
wa/2l
wl/a
wa/l
wa²/2l
Q.10
Pick up the correct statement from the following:
For a uniformly distributed load, the shear force varies linearly
For a uniformly distributed load, B.M. curve is a parabola
For a load varying linearly, the shear force curve is a parabola
All the above
Q.11
In the truss, the force in the member AC is
6.25 t compressive
8.75 t tensile
t tensile
t compressive
Q.12
The ratio of the stresses produced by a suddenly applied load and by a gradually applied load on a bar, is
1/4
1/2
1
2
Q.13
The ratio of circumferential stress to the longitudinal stress in the walls of a cylindrical shell, due to flowing liquid, is
½
1
1½
2
Q.14
A close coil helical spring of mean diameter D consists of n coils of diameter d. If it carries an axial load W, the energy stored in the spring, is
4WD²n/d4N
4W²Dn/d4N
4W²D3n/d4N
4W²D3n²/d4N
Q.15
A two hinged parabolic arch of span l and rise h carries a load varying from zero at the left end to ? per unit run at the right end. The horizontal thrust is
ωl²/4h
ωl²/8h
ωl²/12h
ωl²/16h
Q.16
A rolled steel joist is simply supported at its ends and carries a uniformly distributed load which causes a maximum deflection of 10 mm and slope at the ends of 0.002 radian. The length of the joist will be,
10 m
12 m
14 m
16 m
Q.17
The stiffness of the close coil helical spring is
d4N/8D3n
d4N/4D3n
4D3N/d4n
8D3N/d4n
Q.18
A three hinged arch is generally hinged at its supports and
At one quarter span
At the crown
Anywhere in the rib
None of these
Q.19
A shaft is subjected to bending moment M and a torque T simultaneously. The ratio of the maximum bending stress to maximum shear stress developed in the shaft, is
M/T
T/M
2M/ T
2T/M
Q.20
A masonry dam (density = 20,000 N/m³) 6 m high, one metre wide at the top and 4 m wide at the base, has vertical water face. The minimum stress at the base of the dam when the reservoir is full, will be
75 N/m²
750 N/m²
7500 N/m²
75000 N/m²
Q.21
At any point of a beam, the section modulus may be obtained by dividing the moment of inertia of the section by
Depth of the section
Depth of the neutral axis
Maximum tensile stress at the section
Maximum compressive stress at the section
Q.22
Pick up the correct statement from the following:
The structural member subjected to compression and whose dimensions are small as compared to its length, is called a stmt
The vertical compression members are generally known as columns or stanchions
Deflection in lateral direction of a long column, is generally known as buckling
All the above
Q.23
For determining the support reactions at A and B of a three hinged arch, points B and Care joined and produced to intersect the load line at D and a line parallel to the load line through A at D’. Distances AD, DD’ and AD’ when measured were 4 cm, 3 cm and 5 cm respectively. The angle between the reactions at A and B is
30°
45°
60°
90°
Q.24
If Q is load factor, S is shape factor and F is factor of safety in elastic design, the following:
Q = S + F
Q = S – F
Q = F – S
Q = S × F
Q.25
The locus of the end point of the resultant of the normal and tangential components of the stress on an inclined plane, is
Circle
Parabola
Ellipse
Straight line
Q.26
A simply supported beam carries varying load from zero at one end and w at the other end. If the length of the beam is a, the maximum bending moment will be
wa/27
wa²/27
w²a
wa²
Q.27
Stress may be defined as
Force per unit length
Force per unit volume
Force per unit area
None of these
Q.28
A steel bar 5 m × 50 mm is loaded with 250,000 N. If the modulus of elasticity of the material is 0.2 MN/mm² and Poisson’s ratio is 0.25, the change in the volume of the bar is:
1.125 cm³
2.125 cm³
3.125 cm³
4.125 cm²
Q.29
For the close coil helical spring of the maximum deflection is
WD3n/d4N
2WD3n/d4N
4W²D3n/d4N
8WD3n/d4N
Q.30
The maximum deflection due to a load W at the free end of a cantilever of length L and having flexural rigidity EI, is
WL²/2EI
WL²/3EI
WL3/2EI
WL3/3EI
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