Discussion
A propped cantilever is indeterminate externally of:
Answer: D
A propped cantilever is externally indeterminate to the first degree.
The fixed end supplies three reactions (horizontal, vertical and moment) and the prop adds one vertical reaction, four in all. A plane structure has only three equations of static equilibrium, so one reaction is redundant: 4 - 3 = 1.
A fixed beam (both ends fixed) would be third degree with six reactions, and second degree would correspond to five unknown reactions. Fourth degree has no basis for a single-span propped cantilever.
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