1. As the loading is acting in the two dimensions, that is in a single plane. Thus the calculations involved in the trusses are in 2D.
a) True
b) False
Explanation: The loading is acting in a plane. Thus the calculations are done in 2D only. As the equations for 3D are different. Although the use of vectors can make our task easy but still 2D calculations are done for the trusses, as they are acting in a same plane
2. In case of bridge the load is transferred when __________
a) Stringers > floor beams > joints
b) Floor beams > stringers > joints
c) Joints > floor beams > stringers
d) Stringers > joints > floor beams
Explanation: The bridge load is transmitted to the stringers first. It is then transmitted to the floor beams. The load from beams is then transmitted to the joints. Thus the transmission of the load of the bridge.
3. As the loading in bridge different from the simple trusses the calculations involved in the bridges are all 2D calculations.
a) True
b) False
Explanation: The loading in the bridge is acting in a plane. Thus the calculations are done in 2D only. As the equations for 3D are different. Although the use of vectors can make our task easy but still 2D calculations are done for the trusses, as they are acting in the same plane. But the thing is that the loading in bridge and trusses are same
4. When the bridges are extended over long routes or distance then _________
a) A rocker or a roller is used at the joints
b) They are not extended to such a long distance
c) The bridges are painted
d) The roads are made narrow
Explanation: When the bridges are extended over long routes or distance then a rocker or a roller is used at the joints. This allows the bridge joints to move around. That is when the temperature is raised. The elongations and the contractions of the joints part are not much affected if the rollers and rockers are used.
5. To design the trusses which of the following rules is followed?
a) All the loads are applied by the use of cables
b) The loads are applied at the joints
c) All the loads are not applied at the joints
d) The loads are not applied at all to the joints
Explanation: The set of rules which are used to design the trusses are having various rules. To them, one is that the loads are applied at the joints. This is done with the neglecting of the weight of the trusses section
6. The rules which are used to design the trusses are having various rules. Of them one is that the smooth pins are not used to join the members.
a) Statement is correct
b) Statement is incorrect
c) Statement is incorrect because there are no rules
d) Statement is incorrect as the rolling pins are used
Explanation: The set of rules used to design the trusses are having various rules. Of them one is that the smooth pins are used to join the members. The joint are generally formed by welding the materials at the ends of the trusses. Which gives strength to the design.
7. A _________ truss is in triangular section.
a) Equilateral
b) Simple
c) Complex
d) Lateral
Explanation: A simple truss in the shape of a triangle. It is the equilateral triangle. That is the angle between the legs are 60. This means the load is divided according and are equal in all the legs of the truss. Hence the simple truss.
8. Which of the following is correct?
a) To know the direction of the unknown force we take the assumption of it
b) The direction of the unknown force is known to us already
c) The direction of the unknown can’t be determined
d) The direction of the unknown is of no use, it is not founded
Explanation: The direction of the unknown is not known to us. To know the direction of the unknown force we take the assumption of it. That is we assume that the particular direction might be the direction of the force and then we do the calculations accordingly.
9. If the whole truss is in equilibrium then all the joints which are connected to that truss is in equilibrium. This is known as:
a) Method of joints
b) Section method
c) Scalar field method
d) Vector equilibrium method
Explanation: If the whole truss is in equilibrium then all the joints which are connected to that truss is in equilibrium. This is known as method of joints. This is one of the methods to solve for the forces which are acting along the trusses.
10. The free body diagram of which part of the section of the truss is made to make use of method of joints?
a) Joints
b) Truss
c) The whole structure
d) The combination of joint and the whole structure
Explanation: The free body diagram of joints part of the section of the truss is made to make use of method of joints. Various equations of equilibrium are made to do the calculations. The net force acting on the vertical direction is made zero. Also horizontal direction forces are made to be zero.