## Castigliano’s first theorem is applicable_______________?

A. for statically determinate structures only
B. when the system behaves elastically
C. only when principle of superposition is valid
D. none of the above

A. 2
B. 3
C. 4
D. unrestricted

## Which of the following methods of structural analysis is a displacement method ?

A. moment distribution method
B. column analogy method
C. three moment equation
D. none of the above

## A pin-jointed plane frame is unstable if________________?

A. (m + r)<2j
B. m + r = 2j
C. (m + r)>2j
D. none of the above

where m is number of members, r is reaction components and j is number of joints

## The deflection at any point of a perfect frame can be obtained by applying a unit load at the joint in_________________?

A. vertical direction
B. horizontal direction
C. inclined direction
D. the direction in which the deflection is required

## The deformation of a spring produced by a unit load is called _________________?

A. stiffness
B. flexibility
C. influence coefficient
D. unit strain

## The degree of static indeterminacy of a rigid-jointed space frame is_________________?

A. m + r – 2j
B. m + r – 3j
C. 3m + r – 3j
D. 6m + r – 6j
where m, r and j have their usual meanings

## For a two-hinged arch, if one of the supports settles down vertically, then the horizontal thrust______________?

A. is increased
B. is decreased
C. remains unchanged
D. becomes zero

## Select the correct statement?

A. Flexibility matrix is a square symmetrical matrix
B. Stiffness matrix is a square symmetrical matrix
C. both A. and B.
D. none of the above

A. 0.16 Wl
B. 0.20 Wl
C. 0.24 Wl
D. 0.25 Wl

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