Question 1

Many new engine designs use flow rate-controlled oil pumps or _______, which operate at either a high-pressure or low-pressure setting, depending on operating requirements.

Accepted Answer

A) three-stage pumps" 
B) two-stage pumps" 
C) compound pumps 
D) gerotor pumps"

Question 2

The 15W in 15W-40 engine oil stands for which of the following?

Accepted Answer

A) Multiviscosity. 
B) Viscosity at 0°F (−18°
C) . 
C) Viscosity at 212°F (100°
C) . 
D) The thickness of the oil when cold.

Question 3

Technician A says the oil-pressure regulator automatically reduces oil pressure at low-speed and low-load conditions. Technician B says that two-stage pressure regulation is performed electronically to reduce fuel consumption. Who is correct?

Accepted Answer

A) Technician A 
B) Technician B 
C) Both A and B 
D) Neither A nor B

Question 4

What series oils are designated for use in compression-ignition engines?

Accepted Answer

A) C series" 
B) S-series" 
C) D-series 
D) A-series"

Question 5

Which of the following conditions does NOT require the oil to be changed?

Accepted Answer

A) Coolant leaking into the oil" 
B) Defective air filter" 
C) Fuel leaking into the oil 
D) Engine oil leak"

Question 6

Technician A says that low-sulfur oil needs to be used today to prevent damage to exhaust aftertreatment systems. Technician B says that today's oils should have low ash content. Who is correct?

Accepted Answer

A) Technician A 
B) Technician B 
C) Both A and B 
D) Neither A nor B

Question 7

What percentage of the cost of a spin-on filter is in the steel canister and valves?

Accepted Answer

A) 10%" 
B) 30%" 
C) 50% 
D) 80%"

Question 8

The presence of cavitation on the coolant side of the cylinder wall is most likely caused by __________.

Accepted Answer

A) lubrication breakdown" 
B) excessive cylinder pressures" 
C) excessive cooling system pressure 
D) improperly conditioned coolant"

Question 9

Technician A says that a drop in the coolant level in the surge tank or coolant overflow reservoir when the engine cools indicates an internal engine leak. Technician B says that the drop in the level is normal. Who is correct?

Accepted Answer

A) Technician A" 
B) Technician B" 
C) Both A and B 
D) Neither A nor B"

Question 10

What has two different scales for measuring the freeze protection of PG and EG coolants?

Accepted Answer

A) Refractometer 
B)  Hydrometer 
C) Manometer 
D)  Digital gauge

Question 11

Technician A says that a drop in the coolant level in the surge tank or coolant overflow reservoir when the engine cools indicates an internal engine leak. Technician B says that the drop in the level is normal. Who is correct?

Accepted Answer

A) Technician A 
B) Technician B 
C) Both A and B 
D) Neither A nor B

Question 12

Which of the following standards is designed for compatibility with biofuels and the latest exhaust aftertreatment systems?

Accepted Answer

A) FA-4" 
B) CK-4" 
C) CJ-4 
D) FJ-5"

Question 13

Oil coolers have a(n) ________ for either coolant or oil, which will not allow oil cooling until the engine oil or coolant has reached operating temperature.

Accepted Answer

A) thermostatically controlled inlet" 
B) inlet control valve" 
C) ECM shift valve 
D) pressure regulator valve"

Question 14

Which of the following major lubrication system components does NOT function to meet durability requirements?

Accepted Answer

A) Oil filter(s)" 
B) Oil sump" 
C) Oil level dipstick 
D) Oil-pressure regulating and pressure-relief valves"

Question 15

Diesel engine oil has which job of the following extra jobs to perform, which gasoline engines are not necessarily required to perform?

Accepted Answer

A) High-speed lubrication." 
B) Cooling piston crowns." 
C) Absorbing shock loading that engine parts can incur. 
D) Sealing piston rings."

Question 16

Which of the following ingredients is added to diesel engine coolant to prevent cavitation?

Accepted Answer

A) Nitrite. 
B) Silicate. 
C) Ethylene glycol (EG). 
D) Borate.

Question 17

Cooling systems must deaerate the coolant to prevent the pumps and coolant passageways in the cylinder head from becoming:

Accepted Answer

A) air bound" 
B) blocked" 
C) pressurized 
D) water-bound"

Question 18

Technician A says that the cooling system pressurizes to enable coolant to remove more heat from the engine. Technician B says pressurization is needed to keep the coolant from boiling. Who is correct?

Accepted Answer

A) Technician A 
B) Technician B 
C) Both A and B 
D) Neither A nor B

Question 19

What speeds up warm-up, when the engine is below its normal operating temperature, by blocking coolant flow from the engine to the radiator?

Accepted Answer

A) Thermostat" 
B) Radiator" 
C) Water pump 
D) Surge tank"

Question 20

Technician A says that diesel engine oil turns black faster than oil in an SI engine because the oil composition and quality are different between the two oils. Technician B says that there is no difference between diesel engine and SI engine oil. Who is correct?

Accepted Answer

A) Technician A" 
B) Technician B" 
C) Both A and B 
D) Neither A nor B"

Exam 7: Diesel Engine Cooling and Lubrication Systems

Many new engine designs use flow rate-controlled oil pumps or _______, which operate at either a high-pressure or low-pressure setting, depending on operating requirements.

The 15W in 15W-40 engine oil stands for which of the following?

Technician A says the oil-pressure regulator automatically reduces oil pressure at low-speed and low-load conditions. Technician B says that two-stage pressure regulation is performed electronically to reduce fuel consumption. Who is correct?

What series oils are designated for use in compression-ignition engines?

Which of the following conditions does NOT require the oil to be changed?

Technician A says that low-sulfur oil needs to be used today to prevent damage to exhaust aftertreatment systems. Technician B says that today's oils should have low ash content. Who is correct?

What percentage of the cost of a spin-on filter is in the steel canister and valves?

The presence of cavitation on the coolant side of the cylinder wall is most likely caused by __________.

Technician A says that a drop in the coolant level in the surge tank or coolant overflow reservoir when the engine cools indicates an internal engine leak. Technician B says that the drop in the level is normal. Who is correct?

What has two different scales for measuring the freeze protection of PG and EG coolants?

Technician A says that a drop in the coolant level in the surge tank or coolant overflow reservoir when the engine cools indicates an internal engine leak. Technician B says that the drop in the level is normal. Who is correct?

Which of the following standards is designed for compatibility with biofuels and the latest exhaust aftertreatment systems?

Oil coolers have a(n) ________ for either coolant or oil, which will not allow oil cooling until the engine oil or coolant has reached operating temperature.

Which of the following major lubrication system components does NOT function to meet durability requirements?

Diesel engine oil has which job of the following extra jobs to perform, which gasoline engines are not necessarily required to perform?

Which of the following ingredients is added to diesel engine coolant to prevent cavitation?

Cooling systems must deaerate the coolant to prevent the pumps and coolant passageways in the cylinder head from becoming:

Technician A says that the cooling system pressurizes to enable coolant to remove more heat from the engine. Technician B says pressurization is needed to keep the coolant from boiling. Who is correct?

What speeds up warm-up, when the engine is below its normal operating temperature, by blocking coolant flow from the engine to the radiator?

Technician A says that diesel engine oil turns black faster than oil in an SI engine because the oil composition and quality are different between the two oils. Technician B says that there is no difference between diesel engine and SI engine oil. Who is correct?