THEORY OF STRUCTURES QUIZ

The degree of static indeterminacy of a rigid-jointed space frame is (where m, r and j have their usual meanings)

m + r – 3j

m + r – 2j

6m + r – 6j

3m + r – 3j

TRUE ANSWER : ?
YOUR ANSWER : ?

When a series of wheel loads crosses a simply supported girder, the maximum bending moment under any given wheel load occurs when

The wheel load under consideration is midway between the centre of span and the centre of gravity of the load system

The centre of span is midway between the centre of gravity of the load system and the wheel load under consideration

None of these

The centre of gravity of the load system is midway between the centre of span and wheel load under consi-deration

TRUE ANSWER : ?
YOUR ANSWER : ?

The fixed support in a real beam becomes in the conjugate beam a

Free end

Hinged support

Fixed support

Roller support

TRUE ANSWER : ?
YOUR ANSWER : ?

The maximum bending moment due to a train of wheel loads on a simply supported girder

None of these

Never occurs under a wheel load

Always occurs at centre of span

Always occurs under a wheel load

TRUE ANSWER : ?
YOUR ANSWER : ?

The effective length of lacing is the distance

Between the inner end rivets of the bar for single lacing

0.7 of the distance between the inner end rivets of the bar for double lacing

All of these

Between the inner ends of effective lengths of welds connecting the members

TRUE ANSWER : ?
YOUR ANSWER : ?

In column analogy method, the area of an analogous column for a fixed beam of span L and flexural rigidity El is taken as

L/3EI

L/2EI

L/EI

L/4EI

TRUE ANSWER : ?
YOUR ANSWER : ?

Muller Breslau’s principle for obtaining influence lines is applicable to i) trusses ii) statically determinate beams and frames iii) statically indeterminate structures, the material of which is elastic and follows Hooke’s law iv) any statically indeterminate structure The correct answer is

(i) and (ii)

(i), (ii) and (iv)

only (i)

(i), (ii) and (iii)

TRUE ANSWER : ?
YOUR ANSWER : ?

For under water concreting.

De-watering by pumping is not done or until 24 hours thereafter

The volume of coarse aggregates shall not be less than one and half times and not more than twice that of fine aggregate

All of these

At least 10 percent more cement is required as compared to dry conditions

TRUE ANSWER : ?
YOUR ANSWER : ?

Pick up the incorrect statement from the following:

None of these

The gross section of the web of rolled I-beams is the depth of the beam multiplied by the web thickness

The gross section of the web of channels is the depth of the web multiplied by its thickness

The gross section of the web of plate girders is the depth of the web plate multiplied by its thickness

TRUE ANSWER : ?
YOUR ANSWER : ?

The Castigliano's second theorem can be used to compute deflections

At the point under the load only

In statically determinate structures only

For any type of structure

For beams and frames only

TRUE ANSWER : ?
YOUR ANSWER : ?