11) In a two hinged arch an increase in temperature induces
a) no bending moment in the arch rib
b) uniform bending moment in the arch rib
c) maximum bending at the crown
d) maximum bending moment at the crown
12) An arch is used in long span bridges because there is
a) considerable reduction in horizontal thrust
b) considerable reduction in bending moment
c) reduction in shear and bending mment
d) no change in shear and bending moment
13) A symmetrical two-hinged parabolic arch rib has a span of 32 m between abutment pins at the same level and a central rise of 5 m. when a rolling load of 100 kn crosses the span, the maximum horizontal thrust at the hinges will be
a) 100 kn
b) 125 kn
c) 160 kn
d) 240 kn
14) A parabolic arch, symmetrical, with hinges at centre and ends, carries a point load P at a distance x from left support. The arch has a span of 20 m and rise of 5 m. what is the value of x if the left hinge reaction in inclined with a slope of two vertical to one horizontal ?
a) 8 m
b) 5 m
c) 4 m
d) 2.5 m
15) Which one of the following statements is correct ?
The portal method of structural analysis is generally suitable for :
a)tall buildings
b) low-rise buildings
c) low-rise buildings with uniform framing
d) low-rise buildings with nonuniform framing
16) A fixed beam of uniform section is carrying a point load at its midspan. If the moment of inertia of the middle half length is now reduced to half its previous value, then the fixed end moments will
a) increase
b) decrease
c) remain constant
d) change their directions
17) When a load is applied to a structure with rigid joints
a) there is no rotation or displacement of joint
b) there is no rotation of joint
c) there is no displacement of joint
d) there can be rotation and displacement of joint but the angle between the members connected to the joint remains same even after application of
the load.
18) Unequal settlements in the supports of a statically determinate structure develop
a) reactions from supports
b) member force
c) no reactions
d) forces in limited members
19) Virtual work means
Work done by real forces due to hypothetical displacements
Work done by hypothetical forces during real displacements
(a) Both A and B correct
(b) A is correct and B is wrong
(c) A is wrong and B is correct
(d) Both A and B are wrong
20) Four point loads 8, 15, 15 and 10 kN have centre-to-centre spacing of 2 m between consecutive loads and they traverse a girder of 30 m spam from left to right with 10 kN load loading. The maximum shear force at 8 m from left support will be
(a) 8.2 kN
(b) 25.4 kN
(c) 30.2 kN
(d) 42.2 kN