54 QUESTIONS AND PROBLEMS. CHAPTER III. 



34. What combinations of the equations of equilibrium may 

 be used in getting reactions? In getting stresses by the methods 

 of sections and of joints? 



35. What is the simplest method of getting the stress DI 

 in Fig. 50? 



36. What are the disadvantages in the use of the resolution 

 equations of equilibrium? Of the moment equations? 



37. Are reactions usually found graphically or algebraic- 

 ally? In what cases should a graphic method of finding stresses 

 be used, and which one? 



38. What is meant by a statically indeterminate structure? 

 How may the truss of Fig. 52 be made statically indeterminate 

 as regards stresses? As regards reactions? 



39. What tools are necessary for drawing stress diagrams? 

 What are the points upon which particular care should be 

 bestowed? 



