FARM MOTORS 333 



QUESTIONS 



1. Why is the horse the principal source of farm power? 



2. To what extent has the horse been developed as a farm motor? 



3. In what way does the horse differ from mechanical motors? 



4. What kind of motor is the horse? 



5. What relation is there between the weight of a horse and the 

 power it can develop? 



6. How does an increase in the speed or length of working day 

 affect the power of the horse? 



7. To what extent can a horse deliver power in excess of the nor- 

 mal rate? 



8. How many hours of service does an average farm horse render 

 in a year? 



9. Explain how horses may be arranged in large teams for heavy 

 loads. 



10. Upon what factors does the amount of resistance a horse can 

 overcome depend? 



11. How does the height and length of a horse affect the resistance 

 he can overcome? 



12. What is meant by a horse's grip? 



13. Explain the importance of muscular development in a draft 

 horse. 



14. Discuss the influence of angle of trace on draft. 



15. Why is the angle of least draft not always best? 



16. How does the length of hitch affect the resistance a horse can 

 overcome? 



