Subject: Theory of Structures-I/ Structural Analysis-I
Topic:- Three Hinged Arches and Suspension Cables
1.
Pick up the incorrect statement from the following. In case of suspension
bridge due to rise in temperature,
(A) Dip
of the cable increases
(B) Length
of the cable increases
(C) Dip
of the cable decreases
(D) None
of these.
Answer: C
2.
to avoid bending action at the base of a pier,
(A) Suspension
and anchor cables are kept at the same level
(B) Suspension
and anchor cables are fixed to pier top
(C) Suspension
cable and anchor cables are attached to a saddle mounted on rollers on top of
the pier
(D) None
the these
Answer: B
3.
The shape of a suspended cable under its own weight, is
(A) Parabolic
(B) Circular
(C) Catenary
(D) Any
of the above
Answer: C
4.
A three-hinged arch is said to be :
(A) Statically
determinate structure
(B) Statically
indeterminate structure
(C) A
bent beam
(D) None
of these
Answer: A
5.
A three hinged parabolic arch hinged at the crown and springings, has a
horizontal span of 4.8 m and a central rise of 1 m. It carries a uniformly
distributed load of 7.5 kN per meter over half left hand span. The horizontal
thrust at the support will be
(A) 10.8
kN
(B) 1.08
kN
(C) 1.8
kN
(D) 0.8
kN
Answer: A
6.
If a three hinged parabolic arch carries a uniformly distributed load on its
entire span, every section of the arch resists.
(A) Compressive
force
(B) Tensile
force
(C) Shear
force
(D) Bending
moment
Answer: A
7. In a three hinged arch, the shear force
is usually
(A) Maximum
at crown
(B) Maximum
at springings
(C) Maximum
at quarter points
(D) Varies
with slope
Answer: B
8.
An arch may be subjected to
(A) Shear
and axial force
(B) Bending
moment and shear force
(C) Bending
moment and axial force
(D) Thrust,
shear force and bending moment
Answer: D
9.
An arch with three hinges, is a structure
(A) Statically
determinate
(B) Statically
indeterminate
(C) Geometrically
unstable
(D) Structurally
sound but indeterminate
Answer: A
10.
In a three hinged arch, the third hinge is generally kept at
(A) Crown
of the arch
(B) Midpoint
of the crown and left support hinge
(C) Midpoint
of the crown and right support hinge
(D) None
of these
Answer: A
11.
In a three hinged arch, the bending moment will be zero
(A) At
right hinge only
(B) At
left hinge only
(C) At
all the three hinges
(D) At
both right and left hinges
Answer: C
12.
In a solid arch, shear force acts
(A) Vertically
upwards
(B) Along
the axis of the arch
(C) Tangentially
to the arch
(D) Perpendicular
to the axis of arch
Answer: D
13.
A three hinged arch is loaded with an isolated load 1 kN at a horizontal
distance of 2.5 m from the crown, 1 m above the level of hinges at the supports
10 metres apart. The horizontal thrust is
(A) 0.125
kN
(B) 0.75
kN
(C) 1.25
kN
(D) 2.5
kN
Answer: C
14.
The rise of a parabolic arch at quarter points, is equal to
(A) (1/4)
times the rise of the crown
(B) (1/2)
times the rise of the crown
(C) (1/3)
times the rise of the crown
(D) (3/4)
times the rise of the crown
Answer: D
15.
The effect of arching a beam, is
(A) To
reduce the bending moment throughout
(B) To
increase the bending moment throughout
(C) Nothing
on the bending throughout
(D) Any
of the above
Answer: A
16.
If a three hinged parabolic arch, (span L, rise h) is carrying a uniformly
distributed load w/unit length over the entire span,
(A) Horizontal
thrust is wL2/8h
(B) S.F.
will be zero throughout
(C) B.M.
will be zero throughout
(D) All
the above
Answer: D
17.
A three hinged arch is generally hinged at its supports and
(A) At
one quarter span
(B) At
the crown
(C) Anywhere
in the rib
(D) None
of these
Answer: C
18.
A three hinged arch will have three hinges
(A) One
hinge at the crown essentially and the other two any where
(B) Two
at the two ends and one anywhere in between the two ends
(C) Two
at the two ends the third at the crown only
(D) None
of the above
Answer: B
19.
Cables resist external loads by
(A) Tension
(B) Compression
(C) Bending
(D) Compression
& bending
Answer: A
20.
An arch resist the external load by
(A) Normal
thrust
(B) Normal
thrust and bending moment
(C) Bending
moment and radial shear
(D) Normal
thrust, radial shear and bending moment
Answer: D
21.
The shape of cable under transverse uniformly distributed load is
(A) Parabolic
(B) Catenary
(C) Circular
(D) Triangular
Answer: A
22.
A circular three pinned arch of span 20 m and a rise of 5 m is hinged at a
crown and springing. It carries a load of u.d.l. of 10 kN/m over entire span.
The horizontal thrust at the right springing will be
(A) 800
kN
(B) 600
kN
(C) 400
kN
(D) 100
kN
Answer: D
23.
A circular three pinned arch of span 20 m and a rise of 5 m is hinged at a
crown and springing. It carries a load of u.d.l. of 10 kN/m over entire span.
The horizontal thrust at the left springing will be
(A) 100
kN
(B) 400
kN
(C) 600
kN
(D) 800
kN
Answer: A
24.
A circular three pinned arch of span 20 m and a rise of 5 m is hinged at a
crown and springing. It carries a load of u.d.l. of 10 kN/m over entire span. What
will be the horizontal reactions at the supports,
(A) 100
kN
(B) 400
kN
(C) 600
kN
(D) 800
kN
Answer: A
25. A 3 hinged arch of span 40m and rise 8m carries concentrated
loads of 200 kN and 150 kN at a distance of 8m and 16m from the left end and an
udl of 50 kN/m on the right half of the span. What will be the horizontal thrust?
(A) 500 kN
(B) 850
kN
(C) 875
kN
(D) 900
kN
Answer: C
26. A 3 hinged arch of span 40m and rise 8m carries concentrated
loads of 200 kN and 150 kN at a distance of 8m and 16m from the left end and an
udl of 50 kN/m on the right half of the span. What will be the horizontal reaction
on left support?
(A) 500 kN
(B) 850
kN
(C) 875
kN
(D) 900
kN
Answer: A
27. A 3 hinged arch of span 40m and rise 8m carries concentrated
loads of 200 kN and 150 kN at a distance of 8m and 16m from the left end and an
udl of 50 kN/m on the right half of the span. What will be the horizontal reaction
on right support?
(A) 500 kN
(B) 850
kN
(C) 875
kN
(D) 900
kN
Answer: B
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