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Question
Consider the following statements with respect to the figure below of a typical articulated frame: 
1.  The frame is internally determinate and externally indeterminate.
2.  The frame is internally indeterminate and externally determinate.
3.  The frame is internally as well as externally determinate.
4.  The frame is internally as well as externally indeterminate.
     Which of these statements is/are correct? 
A.
1 only 
B.
1 and 2
C.
3 only
D.
3 and 4
Answer ( Option C)

3 only

Solution

Ds = m+r-2j

     = 9+3 -2 × 6

     = 12 – 12 = 0

     Dse= r- 3

= 3 – 3 = 0 (Externally determinate)

Dsi = Ds - Dse = 0 (Internally determinate)

r = number of reactions

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