Quiz 1 - Engine Design And Testing
Review questions on engine design
- 1.The_____stroke has the piston moving up and down and squeezing the air/fuel mixture in the cylinder.
- A.
Intake
- B.
Compression
- C.
Power
- D.
Exhaust
- 2.The_____stroke has the piston moving down after the air /fuel mixture explodes in the cylinder.
- A.
Intake
- B.
Compression
- C.
Power
- D.
Exhaust
- 3.The_____stroke has the piston moving down and an air / fuel mixture entering the cylinder.
- A.
Intake
- B.
Compression
- C.
Power
- D.
Exhaust
- 4.The_____stroke has the piston moving up and forcing the burnt air / fuel mixture out of the cylinder.
- A.
Intake
- B.
Compression
- C.
Power
- D.
Exhaust
- 5.Manifold vacuum is formed on the piston's_____stroke.
- A.
Intake
- B.
Compression
- C.
Power
- D.
Exhaust
- 6.Which one of the following is not a stroke of the four-stroke cycle?
- A.
Intake
- B.
Compression
- C.
Ignition
- D.
Exhaust
- 7.A four-stroke cycle engine requires at least___valves at the top of each cylinder.
- A.
One
- B.
Two
- C.
Three
- D.
Four
- 8.Technician A says an engine's firing order is always the same as the cylinder numbering on the crankshaft. Technician B says an engine's firing order is the order in which the cylinders' spark plugs fire. Who is correct?
- A.
A only
- B.
B only
- C.
Both A and B
- D.
Neither A nor B
- 9.Which of the following conditions is generally not revealed by vacuum readings?
- A.
Restricted exhaust system
- B.
Uneven compression
- C.
Weak ignition spark
- D.
Vacuum leak
- 10.Vacuum readings of_____and a steady reading are considered acceptable for most engines running at idle speed.
- A.
2 to 5 inches
- B.
At least 100 psi
- C.
15 to 22 inches
- D.
No more than 20%
- 11.When testing for an exhaust restriction, Technician A runs the engine for a minute at about 2000 rpm with a vacuum gauge installed. Technician B says that a steady reading for the full minute of the test run by Technician A indicates an exhaust restriction. Who is correct?
- A.
A only
- B.
B only
- C.
Both A and B
- D.
Neither A nor B
- 12.Compression readings of_____ and all cylinders within 25% are considered acceptable for most engines.
- A.
2 to 5 inches
- B.
At least 100 psi
- C.
15 to 22 inches
- D.
No more than 20%
- 13.When wet compression test readings are considerably higher than dry compression test readings, what situation is most likely indicated?
- A.
The engine has leaking valves
- B.
The engine test results are normal
- C.
The engine has worn piston rings
- D.
The engine has a worn camshaft
- 14.Cylinder leakage readings of_____ with the only leakage past the piston rings are considered acceptable for most engines.
- A.
2 to 5 inches
- B.
At least 100 psi
- C.
15 to 22 inches
- D.
No more than 20%
- 15.When conducting a cylinder leakage test, Technician A says 15 percent leakage around the rings mean the cylinder in question is defective. Technician B says 15 percent leakage past the intake valve is considered acceptable. Who is correct?
- A.
A only
- B.
B only
- C.
Both A and B
- D.
Neither A nor B
- 16.Which of the following engine problems may be indicated by good results from a cylinder leakage test but poor results from a running vacuum test at idle and poor results from a compression test.
- A.
Intake valve not opening
- B.
Leaking head gasket
- C.
Leaking intake valve
- D.
Worn piston rings
- 17.What is a 'universal' first step in most engine testing?
- A.
Disable the ignition system
- B.
Hold the throttle wide open
- C.
Charge the battery
- D.
Warm up the engine if possible
- 18.What is considered the best way to determine if there is a head gasket leaking between a combustion chamber and the cooling system?
- A.
Vacuum test
- B.
Compression test
- C.
Cylinder leakage test
- D.
Test the cooling system for combustion gasses (chemical or exhaust analyzer)
- 19.Which test can give you the best idea of which cylinder has a problem and in most cases what specific problem exists in that cylinder?
- A.
Vacuum test
- B.
Compression test
- C.
Cylinder leakage test
- D.
Lubricating system gas analysis
- 20.Which of the following can under certain conditions sound like an internal engine ticking noise?
- A.
Normal fuel injector noise
- B.
Minor exhaust leaks near the engine
- C.
Certain emission control devices cycling on and off
- D.
All of the above
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