Structural Analysis Multiple Choice Questions on “Common Types of Trusses”.
1. Which of the following material is not used in making trusses?
a) Wooden struts
b) Metal bars
c) Channel
d) Concrete
Answer: d
Clarification: Concrete is good in compression but weak in tension.
2. The space between adjacent bents in a roof truss is called:-
a) Purlins
b) Bay
c) Knee
d) Braces
Answer: b
Clarification: Space between adjacent bents in a roof truss is called a bay. They are economically spread throughout.
3. In a bridge truss, what is the sequence of load transmission?
a) Stringers to floor beams to side trusses
b) Floor beams to stringers to side trusses
c) Side trusses to stringers to floor beam
d) Side trusses to floor beams to stringers
Answer: a
Clarification: Load on a deck is first transmitted to stringers, hen to floor beams, and finally to side trusses.
4. What is the function of portal in bridge trusses?
a) To resist lateral forces
b) To resist horizontal forces
c) To provide additional stability
d) To allow thermal expansion
Answer: c
Clarification: Portal and sway bracing are there to provide additional stability.
5. A roller is provided at end of a bridge truss to allow thermal expansion.
State whether the above statement is true or false.
a) True
b) False
Answer: a
Clarification: A roller provides freedom of deformation in horizontal plane in case of thermal expansion.
6. Pratt, Howe and warren trusses are used for typically hoe much span length?
a) 100 ft
b) 150 ft
c) 200 ft
d) 250 ft
Answer: c
Clarification: These trusses generally use span length of about 200 ft in length.
7. In a truss it is assumes that the members are joined by:-
a) Rough pins
b) Smooth pins
c) Either of them
d) Neither of them
Answer: b
Clarification: It is assumed as such so as to avoid development of bending stresses.
8. There is no bending stresses in truss due to:-
a) Assumptions made
b) Design
c) Materials used
d) Neither of them
Answer: a
Clarification: Both the assumptions lead to no bending moments in truss system.
9. Generally, in a truss system compressive parts are thicker than tensile parts. Is it true or false?
a) True
b) False
c) Can’t say
d) Depends upon situation
Answer: a
Clarification: Compressive parts are made thicker due to the danger of buckling and instability in them.