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Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question. |
| | 1. | Cetane rating is used when rating: | a. | Diesel fuel | b. | Batter gravity | c. | Antifreeze | d. | Gasoline | | | | | | | | | | |
| | 2. | The pressure in a cooling system is produced by: | a. | Water pump | c. | Expansion of the coolant | | b. | Thermostat | d. | Pressure cap | | | | | | |
| | 3. | If the pressure cap is rated at 15 LBS.then the boiling point of the water will be: | a. | 180 degrees(F) | b. | 215 degrees(F) | c. | 257 degrees(F) | d. | 283 degrees(F) | | | | | | | | | | |
| | 4. | Engine freeze plugs are installed to: | a. | Drain the engine block | c. | Allow piston inspection | | b. | Seal core holes | d. | Prevent block expansion | | | | | | |
| | 5. | The crankshaft rotation in rotation in relation to the camshaft rotation is: | a. | 1 to 1 | b. | 1 to 2 | c. | 4 to 1 | d. | 2 to 1 | | | | | | | | | | |
| | 6. | Which of the following is not required to produce combustion in the engine? | a. | Air | b. | Oil | c. | Fuel | d. | Ignition | | | | | | | | | | |
| | 7. | In which direction does a distributor rotor on gasoline 4 stroke cycle engine rotate? | a. | Clockwise | c. | Counter clockwise | | b. | Counter clockwise or clockwise | d. | Same direction as camshaft | | | | | | |
| | 8. |
What is produced when a storage battery is charged? | a. | Water | c. | Sulfuric acid | | b. | Hydrochloric acid | d. | None of these answers are correct | | | | | | |
| | 9. | The tractor engine will not turn over, what is the first thing to check? | a. | Take fuel filter off and see if plugged | | b. | Check timing | | c. | Check and see if you have engaged all safety switches as tractor in neutral and or engaged clutch | | d. | Check points and plugs | | | | |
| | 10. | The tractor will not start, but will turn over; what is the first thing to check? | a. | Points, see if they arc when turning over engine | | b. | Battery terminals corroded or not | | c. | Check starter amperage | | d. | Take spark plug out of engine and check for spark | | | | |
| | 11. | After opening the spark plug insulator should be what color if in proper heat range: | a. | Grey | c. | Black | d. | Brown | | b. | White | | | | | | | | | | | | |
| | 12. | When converting foot pounds to inch pounds on a torque wrench | a. | Multiply by 12 | b. | Divide by 12 | c. | Add 12 | d. | Subtract 12 | | | | | | | | | | |
| | 13. | A fully charged battery has a specific gravity of: | a. | 1160 | b. | 1.260 | c. | 12.80 | d. | .1160 | | | | | | | | | | |
| | 14. | The function of the carburetor is to: | a. | Measure out the fuel as it is needed by the engine | | b. | Keeps dirt from getting into the engine | | c. | Mix fuel and air in the proper proportions for varying engine speed and load | | d. | Separates water from fuel | | e. | Provides the operator with a means of controlling the temp. of the engine | | | | |
| | 15. | Which of these symptoms would result in neutral (safety) switch became defective? | a. | The starter would run, but the engine would not start. | | b. | The starter would not run. | | c. | This defect would discharge the battery. | | d. | None of these answers are correct. | | | | |
| | 16. | The Venturi on a tractor: | a. | Increases air speed through the carburetor throat. | | b. | Indicates engines RPM’s | | c. | Improves circulation of water through the block. | | d. | Prevents the sparks from jumping the points. | | | | |
| | 17. | What is the most common firing order of a four-cylinder engine? | a. | 1342 | b. | 1234 | c. | 1423 | d. | 1324 | | | | | | | | | | |
| | 18. | The basic difference between gasoline and diesel engines is: | a. | Diesels are lighter constructed | | b. | Diesels are lower compressions | | c. | Diesels fuel is lower energy fuel | | d. | Diesels ignition is by heat of air compressions | | | | |
| | 19. | Poor acceleration, overheating, valve burning and engine missing are most commonly due to: | a. | Operating the engine on too lean a fuel air mixture | | b. | Leaky exhaust manifold gaskets | | c. | Lack of sufficient oil in the air cleaner | | d. | Using two light weight on oil in the crankcase | | e. | Riding the clutch | | | | |
| | 20. | Excessive fuel consumption can be due to: | a. | Operating the tractor with a full open throttle | | b. | Using hot sparks plugs on a gasoline burning tractor | | c. | Overloading the tractor | | d. | The float level being set too low | | e. | Insufficient coolant in the radiator | | | | |
| | 21. | Diesel engines is running rough excessive white smoke, what possibly could be wrong? | a. | Not hot enough spark | d. | Air filters are clogged | | b. | Must be water in the fuel | e. | Engine not properly timed | | c. | The fuel filters are clogged | | | | | | | | |
| | 22. | The crankshaft turns ________ revolution(s) for every complete revolution of the camshaft (4 cylinder engine). |
| | 23. | A cause for excessive oil use is too much: | a. | Crankshaft end play | c. | Valve tappet clearance | | b. | Valve guide clearance | d. | Leaking exhaust valve | | | | | | |
| | 24. | Solenoid clicks, what is the possible trouble? | a. | Faulty starter | | b. | Ignition switch needs to be replaces | | c. | Not enough or no current passing through the contacts after the ignition is activated. check battery and terminals to solenoid | | d. | Starter is not grounded so the solenoid can not activate causing it to just click | | | | |
| | 25. | The governor on diesel engine controls | a. | Air fuel ratio | c. | Displacement ratio | | b. | Diesel engines have no governor | d. | Amount of fuel injected | | | | | | |