- - AGRICULTURE CORE CURRICULUM - -

(CLF2000)  Advanced Core Cluster:  AGRICULTURE MECHANICS

  (CLF2850)  Unit Title:   TYPES OF ENGINES

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  (CLF2899)  Topic:     TYPES OF ENGINES        Time       Year(s)
                          UNIT EXAM             2 Hours     1 / 2 / 3 / 4
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1 . Define the following terms:   (Use the opposite side of the paper.)

    a. Otto cycle                     f. Atmospheric Pressure

    b. Compression ratio              g. Condenser

    c. Coil                           h. Poppet valve

    d. Carburetor                     i. Thermostat

    e. Power Train                    j. Turbocharger


 2. List five (5) reasons why the internal combustion engine is more
    efficient than the external combustion engine.

    a. _______________________________________________________________

    b. _______________________________________________________________

    c. _______________________________________________________________

    d. _______________________________________________________________

    e. _______________________________________________________________


 3. What are the four (4) parts of the Otto cycle principle?

    a. _________________________ b. ____________________________

    c. _________________________ d. ____________________________


 4. Find the total cubic inch displacement for a six cylinder, 3" bore,
    4" stroke, 4-cycle engine. (Show all math calculations on back of paper.)

    Answer: ________________________ Cubic Inches

 5. a. True or False, On a two-stroke cycle engine the camshaft turns
        at two times the speed of the crankshaft.

    b. True or False, A battery used for starting the engine stores
        electrical current.

    c. True or False, Valve overlap refers to the fact that the intake
        and exhaust valves are open at the same time at one point during 
        the Otto cycle.

    d. True or False, The engine coolant is the only element responsible for
        the cooling of a liquid cooled engine.

    e. True or False, Point dwell is the measurement of the number of
        degrees that the points are closed between each spark plug firing.

 6. The two main fuel circuits of a carburetor are the _______________
    circuit and the ______________ circuit.

 7. Explain why a turbocharger is able to provide additional air
    into the engine without needing engine HP to spin the turbo.



 8. What is the torque of a V-8 diesel engine turning at 2100 RPM's
    if its horsepower is 325 at the flywheel? 



 9. How much DBHP (drawbar horsepower) is generated if a tractor
    pulls a 7500 pound load at 6.5 MPH?



10. What four different jobs must all diesel injection pumps perform to
    accomplish fuel delivery to run the engine?

    a. _____________________________ b. ______________________________

    c. _____________________________ d. ______________________________

11. List, in order, all of the different engine parts which air would
    come in contact with as it passes through the intake and out the
    exhaust. Start with the pre-cleaner.

    a. __pre-cleaner_________   f. _______________________

    b. ______________________   g. _______________________

    c. ______________________   h. _______________________

    d. ______________________   i. _______________________

    e. ______________________   j. _______________________
12. Three types of engine air cleaners are:

    a. ____________________ b. ___________________ c. ________________


13. Two different types of diesel injection pumps are __________
    and ____________________ .


14. On a ported two-stroke cycle engine, what engine part functions as
    a valve allowing air/fuel into the cylinder?  ans. ______________


15. List all the parts of the valve train for an overhead valve engine
    starting with the camshaft.

    a. ___camshaft______________      e. ____________________________

    b. _________________________      f. ____________________________

    c. _________________________      g. ____________________________

    d _________________________      h. ____________________________


16. Up and down motion is known as _________________________ motion
    while circular movement is called rotary motion.


17. If an engine compresses eight (8) parts of air into a one-part
    volume, what is the compression ratio?






















7/15/91 YNJ/tf


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