FARM STRUCTURES 413 



QUESTIONS 



1. Upon what three factors does the strength of a beam depend? 



2. Define maximum bending moment. 



3. What is the maximum bending moment for a beam 120 inches 

 long and loaded at the center with 1000 pounds? 



4. Define modulus of section. 



5. What is the modulus of section for a 2x6? 



6. Define modulus of rupture. 



7. What is the modulus of rupture for white pine? Oak? Cast 

 iron? 



8. Give the general formula for beams. 



9. What load will a 2x6 white pine beam carry if the beam be 10 

 feet long and the load be concentrated at the center? If the load ba 

 uniformly distributed? 



10. Give the principal characteristics of the following building 

 materials: stone, brick, lime, Portland cement, sand, concrete. 



11. Explain rich, medium, ordinary, and lean mixtures, and the 

 use of each. 



12. Explain the principles involved in the reinforcing of concrete. 



