Structural Analysis Multiple Choice Questions on “Deflection Diagrams and the Elastic Curve”.
1. When a material returns to its undeformed original position after removal of load, then this behavior is called linear elastic material response.
State whether the above statement is true or false.
a) True
b) False
Answer: a
Clarification: We have considered structures which show linear elastic material response.
2. Which of the following causes greatest deflection for beams?
a) Internal axial force
b) Internal bending
c) Both causes equal deflections
d) External loads
Answer: b
Clarification: Internal bending causes greatest deflection for beam and frames.
3. In a truss, maximum deflection is caused by internal bending.
State whether the above statement is true or false
a) True
b) False
Answer: b
Clarification: Internal axial force causes most deflections in trusses.
4. In deflection diagrams, which of the following can’t have zero deflection in vertical direction?
a) Pin support
b) Roller support
c) Fixed support
d) Hinge
Answer: d
Clarification: Rest all can’t move from their initial positions as they all exert vertical force.
5. In deflection diagrams, which of the following can have zero angular deflection?
a) Pin support
b) Roller support
c) Fixed support
d) Hinge
Answer: c
Clarification: Only fixed support exerts moment at its point of contact.
6. What is the relation between angular deflections between two legs connected by a fixed-connected joint?
a) They are unequal
b) They are equal
c) Can’t say
d) They don’t show angular deflection
Answer: b
Clarification: Since it is a fixed joint, they can’t have a relative angular deflection in between them.
7. What is the relation between angular deflections between two legs connected by a pin-connected joint?
a) They are unequal
b) They are equal
c) Can’t say
d) They don’t show angular deflection
Answer: a
Clarification: Since it is a pin joint, they can have a relative angular deflection in between them.
8. A positive moment by standard sign convention would bend a horizontal beam:-
a) Concave upward
b) Concave downward
c) Convex upward
d) Can’t say
Answer: a
Clarification: It is the same as used earlier. We can take reference from the earlier diagram also.