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49.

When a series of wheel loads crosses a simply supported girder, the maximum bending moment under any given wheel load occurs when                        
A. the center of gravity of the load system is midway between the center of span and wheel load under consduration B. the center of span is midway between the center of gravity of the load system and the wheel load under consideration
C. the wheel load under consideration is midway between the center of span and the center of gravity of the load system D. none of the above



50.

When a uniformly distributed load, longer than the span of the girder, moves from left to right, then the maximum bending moment at mid section of span occurs when the uniformly distributed load occupies                        
A. less than the left half span B. whole of left half span
C. more than the left half span D. whole span



51.

When a uniformly distributed load, shorter than the span of the girder, moves from left to right, then the conditions for maximum bending moment at a section is that                        
A. the head of the load reaches the section B. the tail of the load reaches the section
C. the load position should be such that the section divides it equally on both sides D. the load position should be such that the section divides the load in the same ratio as it divides the span




52.

Which of the following is not the displacement method ?                        
A. Equilibrium method B. Column analogy method
C. Moment distribution method D. Kani's method



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