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Mechanic Sample Exam A
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1. An engine misfire is being diagnosed using a cylinder leakage test. Technician A says that any cylinder with over 20 percent leakage has excessive leakage. Technician B says that air leaking from the tailpipe indicates a cracked cylinder head. Who is right?
4 puntos
A. A only
B. B only
C. Both A and B
D. Neither A nor B
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2. Which of the following steps is the technician LEAST likely to perform when pressing the wrist pin into the piston and connecting rods?
4 puntos
A. Align the bores in the piston and connecting rod.
B. Heat the small end of the connecting rod.
C. Make sure that the position marks on the piston and connecting rod are oriented correctly.
D. Heat the wrist pin.
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3. While cleaning a pleated paper-type air filter element, the air gun should be held:
4 puntos
A. Slightly away from the outside of the air filter element.
B. Directly against the outside of the air filter
C. Directly against the inside of the air filter element.
D. Slightly away from the inside of the air filter element.
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4. When measuring the crankshaft journal as shown in the figure below, the difference between measurements:
4 puntos
A and B indicates horizontal taper.
C and D indicates vertical taper.
A and C indicates out-of-round.
A and D indicates out-of-round.
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5. The tester in the figure below may be used to test all of the following EXCEPT:
4 puntos
A. Cooling system leaks.
B. The radiator cap pressure relief valve.
C. Coolant specific gravity.
D. Heater core leaks.
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6. Technician A says an intake manifold vacuum leak may cause a cylinder misfire with the engine idling. Technician B says an intake manifold vacuum leak may cause a cylinder misfire during hard acceleration. Who is right?
4 puntos
A only
B only
Both A and B
Neither A nor B
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7. In the figure below, an open ground circuit on the engine temperature sensor switch may cause:
5 puntos
A. Continual cooling fan motor operation.
B. A completely inoperative cooling fan motor.
C. A burned-out cooling fan motor.
D. Engine overheating.
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8. A Technician says that code P0442 Evaporative Emissions Control System Leak Detected (Small Leak) is MOST likely caused by:
4 puntos
A. Filling the fuel tank while the vehicle is running.
B. A missing fuel cap.
C. Slightly deformed fuel filler neck.
D. Dime sized hole in charcoal canister.
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9. When attempting to diagnose the cause of a problem, the first step of action would be:
4 puntos
A. Check for Technical Service Bulletin's.
B. Check for trouble codes.
C. Check for blown fuses.
D. Verify the complaint.
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10. With the engine idling, a vacuum gauge connected to the intake manifold fluctuates as shown in the figure below. These vacuum gauge fluctuations may be caused by:
5 puntos
A. Late ignition timing.
B. Intake manifold vacuum leaks.
C. A restricted exhaust system.
D. Sticky valve stems and guides.
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11. Oil is leaking from the crankshaft rear main bearing seal on the engine. Technician A says the oil seal could be faulty. Technician B says the PCV system may not be functioning. Who is right?
4 puntos
A only
B only
Both A and B
Neither A nor B
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12. After a vehicle is parked overnight and then started in the morning, the engine cranks for longer than usual, but eventually starts and runs normally. The MOST likely cause would be:
4 puntos
A. An intake manifold vacuum leak.
B. A faulty fuel pump.
C. A stuck open EGR valve.
D. A faulty PCV valve.
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13. The figure below shows the cylinder and ring ridge. If the amount of the cylinder wear does not require cylinder reboring, Technician A says the ring ridge at the top of the cylinder can be removed with 400-grit sand paper. Technician B says the ring ridge at the top of each cylinder can be removed with a 200-grit bead hone. Who is right?
5 puntos
A only.
B only.
Both A and B
Neither A nor B
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14. A low, steady vacuum gauge reading between 11 - 16 in/Hg as shown below indicates:
5 puntos
A. Burned or leaking valves.
B. Late ignition timing.
C. Weak valve springs.
D. A leaking head gasket.
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15. If threads are damaged, as shown in the figure below, the opening may be drilled and threaded, and then a heli-coil may be installed to provide thread:
5 puntos
A. The same size as the new hole.
B. One thread size smaller than the original.
C. One thread size larger than the original.
D. The same size as the original.
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16. A customer complains about fluid usage in an automatic transmission, and there are no visible signs of fluid leaks. Technician A says the transmission vent may be plugged or restricted. Technician B says the vacuum modulator diaphragm may be leaking. Who is right?
4 puntos
A only
B only
Both A and B
Neither A nor B
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17. A customer complains about slippage between shifts. Technician A says a low fluid level can cause slippage between shifts. Technician B says a low fluid level can be an indicator that there is an external leak. Who is right?
4 puntos
A only
B only
Both A and B
Neither A nor B
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18. A customer states that the transmission shifting performance is poor, Technician A says that a faulty alternator could be the cause. Technician B says that a worn transmission mount will cause poor shifting performance. Which one is right?
4 puntos
A only
B only
Both A and B
Neither A nor B
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19. Technician A says that clutch discs do not need to be soaked in transmission fluid before assembly. Technician B says that lint from clean rags caught on parts during assembly will never cause transmission failure. Who is right?
4 puntos
A only
B only
Both A and B
Neither A nor B
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20. The transmission output shaft seal experiences repeated seal failures. Which of the following will repair the seal failure:
4 puntos
A. Plugging the transmission vent.
B. Draining overfull fluid
C. Replacing the output shaft bushing and seal.
D. Replacing the output shaft seal and using RTV in between the case and seal.
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21. The cause of excessive run-out on the dial indicator shown below could be:
5 puntos
A. Incorrect differential bearing preload.
B. A bent axle shaft.
C. Incorrect pinion depth.
D. Worn limited slip clutch discs.
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22. The transmission shown below has a growling noise in first gear only. The cause of the problem could be:
5 puntos
A. A worn first-gear blocker ring.
B. A worn first-gear synchronizer ring.
C. Chipped and worn first-speed gear teeth.
D. A worn, rough mainshaft bearing.
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23. The marking shown below is required for:
5 puntos
A. Driveshaft removal and replacement.
B. Universal joint removal and replacement.
C. Driveshaft runout measurement.
D. Driveshaft balance testing.
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