FARM MOTORS 369 



2. What will determine the size to be selected? 



3. Why is it not economy to use a large engine for light work? 



4. How much power is usually required to operate a farm pump? 

 A churn? A washing machine? A feed mill? A corn sheller? An 

 ensilage cutter? A threshing machine? 



5. What should govern the type of engine to be selected? 



6. Where may a portable engine be used to advantage? 



7. What are some of the indications of quality in a gasoline or oil 

 engine? 



8. Of what use would a test of the horsepower be? 



9. Explain how the horsepower of an engine can be estimated. 



10. A four-stroke cycle engine has a cylinder 8 inches in diameter; 

 the stroke is 10 inches long and it operates at 360 revolutions per min- 

 ute. Estimate its horsepower. 



11. What are some features to consider in selecting the accessories 

 of an engine? 



12. Give a list of the parts that should be inspected in selecting a 

 gasoline or oil engine. 



Note : — The instructor here should furnish the students with problems 

 in the estimating of the horsepower of engines, perhaps measuring 

 certain engines and comparing the estimated horsepower with manu- 

 facturer's rating. 



