Diesel Test 2 Questions and Correct
Answers
,In what year was API CJ-4 lube oil introduced?
2006
2004
2010
2007 - Correct Answer: 2007
Technician A says that CJ-4 diesel engine lubricating oil is backward compatible with all previous diesel
engine lube oil classifications. Technician B says that the digit 4, in CJ-4 means that the oil is suitable
for 4-stroke cycle use. Who is right?
Technician A only
Technician B only
Neither A nor B
Both A and B - Correct Answer: Both A and B
What is the science of friction and lubrication known as?
physics
chemistry
engineering
tribology - Correct Answer: tribology
If a CI-4 engine lubricating oil was used in place of the OEM specified CJ-4, which of the
following components could be damaged?
,exhaust valves
exhaust gas recirculation (EGR)
system diesel particulate filter (DPF)
turbocharger - Correct Answer: diesel particulate filter (DPF)
The temperature at which an engine oil begins to gel is known as:
freeze point
pour point
fire point
flash point - Correct Answer: pour point
Which of the following is an undesirable constituent of engine oil?
oxidation inhibitors
dispersants
ash
film strength - Correct Answer: ash
Which of the following operations would make the use of an oil scavenging pump desirable?
working below sea level
cold weather operation
high altitude operation
working on a hillside - Correct Answer: working on a hillside
What should be done to a bypass, luberfiner filter after changing the engine oil?
purge air on start-up
, prime with used oil
clean with pressure washer
clean with solvent - Correct Answer: purge air on start-up
What type of oil pressure sensor is most commonly used on electronically managed diesel engines?
electrical
thermistor
bourdon gauge
variable capacitance - Correct Answer: variable capacitance
Technician A says that highway diesel engines equipped with EGR should use a lube oil formulated to
meet the API CI-4 classification or later. Technician B says that CI-4 oil is lower in cost and can be
safely used in diesel engines built before the 2007 EPA year. Who is correct?
Technician B only
Technician A only
Both A and B
Neither A nor B - Correct Answer: Both A and B
Which type of engine coolant offers the best protection against liner cavitation erosion?
PG
WEC
EG
ELC - Correct Answer: WEC
How is rejected heat dissipated in a typical diesel engine?
Answers
,In what year was API CJ-4 lube oil introduced?
2006
2004
2010
2007 - Correct Answer: 2007
Technician A says that CJ-4 diesel engine lubricating oil is backward compatible with all previous diesel
engine lube oil classifications. Technician B says that the digit 4, in CJ-4 means that the oil is suitable
for 4-stroke cycle use. Who is right?
Technician A only
Technician B only
Neither A nor B
Both A and B - Correct Answer: Both A and B
What is the science of friction and lubrication known as?
physics
chemistry
engineering
tribology - Correct Answer: tribology
If a CI-4 engine lubricating oil was used in place of the OEM specified CJ-4, which of the
following components could be damaged?
,exhaust valves
exhaust gas recirculation (EGR)
system diesel particulate filter (DPF)
turbocharger - Correct Answer: diesel particulate filter (DPF)
The temperature at which an engine oil begins to gel is known as:
freeze point
pour point
fire point
flash point - Correct Answer: pour point
Which of the following is an undesirable constituent of engine oil?
oxidation inhibitors
dispersants
ash
film strength - Correct Answer: ash
Which of the following operations would make the use of an oil scavenging pump desirable?
working below sea level
cold weather operation
high altitude operation
working on a hillside - Correct Answer: working on a hillside
What should be done to a bypass, luberfiner filter after changing the engine oil?
purge air on start-up
, prime with used oil
clean with pressure washer
clean with solvent - Correct Answer: purge air on start-up
What type of oil pressure sensor is most commonly used on electronically managed diesel engines?
electrical
thermistor
bourdon gauge
variable capacitance - Correct Answer: variable capacitance
Technician A says that highway diesel engines equipped with EGR should use a lube oil formulated to
meet the API CI-4 classification or later. Technician B says that CI-4 oil is lower in cost and can be
safely used in diesel engines built before the 2007 EPA year. Who is correct?
Technician B only
Technician A only
Both A and B
Neither A nor B - Correct Answer: Both A and B
Which type of engine coolant offers the best protection against liner cavitation erosion?
PG
WEC
EG
ELC - Correct Answer: WEC
How is rejected heat dissipated in a typical diesel engine?
