Engine Mechanical - Ss
- 1.The process of mechanical testing will first help you identify the location of a mechanical problem and then identify the cause of the fault.
- A.
True
- B.
False
- 2.What unit of measure is used when testing engine compression and cylinder leakage?
- A.
Pounds per square inch (psi)
- B.
Kilopascals (kPa)
- C.
Both A and B
- D.
Pound feet
- 3.Which of the following methods may be used to manually perform a cylinder power balance test?
- A.
Unplug the ignition from each cylinder.
- B.
Unplug the fuel injectors.
- C.
Both A and B
- D.
None of the above
- 4.When testing intake manifold vacuum, the gauge needle oscillates back and forth rapidly, which generally indicates:
- A.
A partially restricted exhaust
- B.
A mechanical condition such as a burned or bent valve.
- C.
Late ignition or valve timing.
- D.
None of the above
- 5.How even should the cranking compression be between the lowest and highest cylinder readings on an engine without mechanical problems?
- A.
Within 5%
- B.
Within 3%
- C.
Within 14%
- D.
Within 10%
- 6.Which of the following malfunctions would be revealed during a running compression test?
- A.
A burned exhaust valve
- B.
A badly worn camshaft lobe
- C.
Both A and B
- D.
None of the above
- 7.When checking cranking compression, which of the following malfunctions is either confirmed or ruled out by performing a wet test on a cylinder with low compression?
- A.
A small hole in the top of the piston
- B.
A burned exhaust valve
- C.
A leaking cylinder head gasket
- D.
None of the above
- 8.When performing a cylinder leakage test, a small amount of air leakage can be heard from the exhaust tail pipe. This indicates:
- A.
Worn valve guides.
- B.
A bad exhaust valve
- C.
A bent intake valve.
- D.
A leaking cylinder head gasket.
- 9.When testing cranking compression, Tech A says that all engines may be disabled to avoid starting by placing a shop rag in the engine intake. Tech B says that an engine may be disabled by removing the fuel pump relay (if equipped). Who is correct?
- A.
Tech A
- B.
Tech B
- C.
Both Techs A and B
- D.
Neither Tech A nor B
- 10.Which of the following can be measured by a running compression test, but NOT by a cranking compression test?
- A.
The sealing capability of the valves
- B.
The sealing capability of the rings and pistons
- C.
Bad piston rings
- D.
None of the above
- 11.When performing a cranking compression test, Tech A says the final reading should be reached on the second compression pulse. Tech B says the first compression pulse should read at least half as much as the final reading. Who is correct?
- A.
Tech A
- B.
Tech B
- C.
Both Techs A and B
- D.
Neither Tech A nor B
- 12.Techs A and B are discussing how to obtain the most accurate results when testing cranking compression on a gasoline engine. Tech A says the battery must be at least half charged. Tech B says at least three compression pulses should be made on each cylinder while watching the gauge. Who is correct?
- A.
Tech A
- B.
Tech B
- C.
Both Techs A and B
- D.
Neither Tech A nor B
- 13.When leak-down testing a cylinder with high leakage, air escaping from the spark plug hole of an adjacent cylinder would indicate a possible?
- A.
Hole in the piston
- B.
Intake valve
- C.
Exhaust valve
- D.
Head gasket
- 14.In order to leak check a cylinder, the piston must be on the intake stroke.
- A.
True
- B.
False
- 15.When diagnosing an engine misfire, what test is used to determine the misfiring cylinder?
- A.
Engine vacuum test
- B.
Power balance test
- C.
Cranking compression test
- D.
Cylinder leak-down test
Questions: 8 | Attempts: 18618 | Last updated: Mar 22, 2022
-
Sample QuestionWhat does a spark plug do?
Questions: 10 | Attempts: 6615 | Last updated: Mar 22, 2022
-
Sample QuestionHow many revolutions of the crankshaft are in a complete cycle for a 4-stroke-cycle engine?
Questions: 15 | Attempts: 4029 | Last updated: Mar 22, 2022
-
Sample QuestionThe clutch friction disc always rotates with the:
Back to top