Questions & Answers of Analysis of statically determinate Trusses

A planar truss tower structure is shown in the figure.

Consider the following statement about the external and internal deteriminacies of the truss.

(P) Externally Determinate
(Q) External static Indeterminancy = 1
(R) External static Indeterminancy = 2
(S) Internally Determinate
(T) Internal static Indeterminancy = 1
(U) Internal static Indeterminancy = 2
Which one of the following option is correct?

Consider the frame shown in the figure:

If the axial and shear deformations in diferent members of the frame are assumed to be negligible, the reduction in the degree of kinematical indeterminacy would be equal to

For the truss shown below, the member PQ is short by 3 mm. The magnitude of vertical displacement of joint R (in mm) is _______________

The pin-jointed 2-D truss is loaded with a horizontal force of 15 KN at joint S and another 15 KN vertical force at joint U, as shown.Find the force in member RS (in KN) and report your answer taking tension as positive and compression as negative. __________

For the truss shown in the figure, the force in the member QR is

The members EJ and IJ of a steel truss shown in the figure below are subjected to a temperature rise of 30oC. The coefficient of thermal expansion of steel is 0.000012 per oC per unit length. The displacement (mm) of joint E relative to joint H along the direction HE of truss, is