360 AGRICULTURAL ENGINEERING 



QUESTIONS 



1. Why is ignition so important to the success of a gas engine? 



2. Describe the hot- tube igniter. 



3. What are the names of the two systems of electric ignition? 



4. Describe the make-and-break system of ignition. 



5. Explain how this system may be tested. 



6. Describe the jump-spark system of ignition. 



7. Explain how this system may be tested. 



8. Describe the use of dry cells as a source of current for electric 

 ignition. 



9. How does the dynamo or magneto furnish electricity for igni- 

 tion purposes? 



10. Why is valve action or timing important? 



11. Describe in a general way when the inlet and exhaust valves 

 should open and close with reference to the position of the crank. 



