AMT 242 Chapter 6
Which of the following ingredients is added to the engine coolant to prevent cavitation? a. Nitrite b. Silicate c. Ethylene glycol d. Phosphate
a. Nitrite
Which of the following is the recommended service interval for conventional Type 1 low-silicate ethylene glycol antifreeze? a. 1 year b. 2 years c. 3 years d. 4 years
b. 2 years
What is the maximum percentage of soot loading that requires engine oil to be changed? a. 2% b. 5% c. 10% d. 20%
b. 5%
Which of the following is a likely cause of engine oil in the engine coolant? a. A leaking head gasket b. A corroded/leaking oil cooler c. Excessive oil pressure d. Leaking valve cover gaskets
b. A corroded/ leaking oil cooler
Which of the following is the most recent engine oil for a diesel engine? a. SG-4 b. CJ-4 c. SJ d. CK-4
b. CJ-4
Diesel engine oil has the following extra job to perform, which gasoline engines are not necessarily required to perform. a. High-speed lubrication b. Cooling of piston crowns c. Absorb shock loading of engine parts d. Sealing of piston rings
b. Cooling of piston crowns
Gasoline-fueled engine antifreeze and diesel engine antifreeze use the same amount of silicates. a. True b. False
b. False
Which antifreeze will require the highest concentration to maintain 0 degrees freeze protection? a. Ethylene glycol b. Propylene glycol
b. Propylene glycol
The 15W in 15W-40 engine oil stands for which of the following? a. Multiviscosity b. Viscosity at 0 degrees c. Viscosity at 212 degrees d. The thickness of the oil when cold
b. Viscosity at 0 degrees
Which of the following is the normal operating oil temperature of a diesel engine? a. 20 degrees to 30 degrees lower than coolant temperature b. Close to cooling system operating temperature c. 30 degrees to 40 degrees above cooling system temperature d. Approximately 250 degrees
c. 30 degrees to 40 degrees above cooling system temperature
Which of the following will likely cause excessively high oil pressures? a. A plugged oil filter b. A defective oil filter bypass valve c. A defective pressure regulating valve d. A defective pressure relief valve
c. A defective pressure regulating valve
Which series of engine oils are used in a diesel engine? a. S series b. ASTM c. C series d. SAE
c. C series
Newer chemical formulations of premium long life antifreeze using organic acids require what level of DCA/SCA conditioners? a. The same amount of conditioner b. More conditioner c. Significantly less conditioner
c. Significantly less conditioner
An engine equipped with a 10-psi pressure cap will prevent cooling system boil-over up to which of the following temperatures? a. 212 degrees b. 222 degrees c. 232 degrees d. 242 degrees
d. 242 degrees
Maximum lube oil temperature should not exceed which of the following? a. 200 degrees b. 215 degrees c. 235 degrees d. 250 degrees
d. 250 degrees
Which of the following maintenance practices best controls SCA and DCA levels of the cooling system? a. Flushing the cooling system regularly b. Using a thermostat with a high operating temperature c. Changing the antifreeze/coolant yearly d. Changing the coolant filter when necessary
d. Changing the coolant filter when necessary
The presence of cavitation on a wet-type cylinder liner is most likely caused by: a. Lubrication breakdown b. Excessive cylinder pressures c. Excessive cooling system pressure d. Improperly conditioned coolant
d. Improperly conditioned coolant
Silicate is added to antifreeze to: a. Prevent scaling on hot surfaces b. Minimize cavitation c. Add freeze protection to coolant d. Minimize electrochemical reactions
d. Minimize electrochemical reaction
