Question 1

An engine that is hard to turn due to a mechanical problem will have a higher than normal amperes reading during a starter draw test.

Accepted Answer

When an engine is hard to turn, it requires more energy to turn it over, which means the starter motor will draw more amperes to compensate for the additional load. Therefore, a higher than normal amperes reading during a starter draw test indicates a mechanical problem with the engine.

Question 2

All of the following are true about synthetic oils compared to traditional oils except:
A) reduce friction better
B) cost more
C) extend vehicle warranties
D) are more stable over a wider temperature range

Accepted Answer

Synthetic oils do not extend vehicle warranties by themselves. Their benefits include reducing friction, costing more, and being more stable over a wide temperature range, but warranties are determined by manufacturers and not directly extended by the use of synthetic oils.

Question 3

During a battery terminal test, a voltage of 0.05 would indicate a poor connection in need of servicing.

Accepted Answer

False

Question 4

A stuck closed pressure relief valve on an oil pump would result in low or no oil pressure.

Accepted Answer

A stuck closed pressure relief valve on an oil pump would result in high oil pressure, as the oil is not being diverted back to the pump inlet and is instead building up in the system.

Question 5

Thermostats are being discussed. Technician A says that a stuck closed thermostat may cause engine overheating. Technician B says that it is possible to test a thermostat by submerging it in a container of water while heating it and watching a thermometer. Who is correct?
A) A only
B) B only
C) Both A and B
D) Neither A nor B

Accepted Answer

Both technicians are correct. A stuck closed thermostat can cause engine overheating by not allowing coolant to flow through the engine. And it is possible to test a thermostat by submerging it in a container of water while heating it and watching a thermometer to see if it opens and closes at the correct temperature.

Question 6

What additive in oil aides in the prevention of varnish buildup?
A) antioxidation agents
B) viscosity index improver
C) antifoaming agents
D) cohesion agents

Accepted Answer

Antioxidation agents are additives that help prevent the oxidation of oil, which can lead to the formation of varnish and other harmful deposits.

Question 7

Technician A says that a fully charged car battery produces 12.6 volts. Technician B says that on top post batteries, the positive terminal is smaller than the negative to help prevent connecting in reverse polarity. Who is correct?
A) A only
B) B only
C) Both A and B
D) Neither A nor B

Accepted Answer

Technician A is correct because a fully charged car battery indeed produces around 12.6 volts. Technician B is incorrect; in reality, the positive terminal is larger than the negative terminal on top post batteries to help prevent reverse polarity connections.

Question 8

An engine has lower-than-specified oil pressure. Technician A says the oil pressure relief valve may be stuck closed. Technician B says there may be excessive clearance between the oil pump gears. Who is correct?
A) A only
B) B only
C) Both A and B
D) Neither A nor B

Accepted Answer

Excessive clearance between the oil pump gears can lead to lower oil pressure, while a stuck closed relief valve would cause higher pressure, not lower.

Question 9

The starter motor spins the engine at about 200-250 rpm for starting purposes.

Accepted Answer

This is generally true for most vehicles, though the exact RPM may vary depending on the make and model.

Question 10

What category of oil will work for all automotive gasoline engines currently in use?
A) SL
B) SO
C) SM
D) SN

Accepted Answer

SN is the newest and highest quality category of oil that is designed to work for all gasoline engines currently in use. Therefore, it is the best choice for optimal engine performance and protection.

Question 11

S-class motor oil should be used in diesel engines.

Accepted Answer

S-class motor oil is not recommended for use in diesel engines. Diesel engines require oils with higher viscosity, detergency and anti-wear properties, such as API CK-4 or CJ-4 oils.

Question 12

It is best to change motor oil when the engine is cold and the oil has had time to drain from all internal parts.

Accepted Answer

It is actually best to change motor oil when the engine is warm because warm oil flows more easily, allowing for a more complete and effective oil change. However, it is important to let the engine cool down for a few minutes before changing the oil to avoid burning yourself on hot components.

Question 13

Motor oil is being discussed. Technician A says that the "W" in 10W-30 stands for "weight." Technician B says that thicker oils can cause lubrication problems in colder climates. Who is correct?
A) A only
B) B only
C) Both A and B
D) Neither A nor B

Accepted Answer

The "W" in 10W-30 actually stands for "Winter," indicating the oil's viscosity in cold conditions, not "weight." Thicker oils can indeed cause lubrication problems in colder climates because they do not flow as well, making it harder for the engine to turn over and properly lubricate.

Question 14

During an engine overhaul, oil pump replacement is very expensive and repairs are usually not necessary.

Accepted Answer

Oil pump replacement during an engine overhaul can be expensive, but it may be necessary if the pump is worn, damaged or malfunctioning. It's important to ensure that the oil pump is functioning correctly to prevent engine damage and promote longevity.

Question 15

Technician A says that a defective PCV valve could cause excessive crankcase pressure. Technician B says that a defective PCV valve could cause an oil leak. Who is correct?
A) A only
B) B only
C) Both A and B
D) Neither A nor B

Accepted Answer

Both Technician A and Technician B are correct. A defective PCV (Positive Crankcase Ventilation) valve can indeed cause excessive crankcase pressure, which in turn can lead to oil leaks among other issues.

Question 16

Shimming a starter is done to obtain the correct pinion-to-ring gear clearance.

Accepted Answer

Shimming a starter is commonly done to ensure the proper clearance between the starter motor's pinion gear and the flywheel or ring gear of the engine. This correct clearance is important for reliable starting performance and preventing damage to the starter or engine components.

Question 17

Propylene glycol-based coolant is less toxic than ethylene glycol.

Accepted Answer

Propylene glycol is considered less toxic than ethylene glycol because it is less harmful if ingested and does not form as many toxic byproducts when it breaks down. However, it can still be dangerous if ingested in large amounts.

Question 18

Technician A says that as pressure increases on the coolant in the cooling system, the boiling point is raised. Technician B says that on a reverse flow cooling system, the coolant flows from the radiator to the cylinder heads first. Who is correct?
A) A only
B) B only
C) Both A and B
D) Neither A nor B

Accepted Answer

Technician A is correct. When pressure increases on the coolant in the cooling system, the boiling point is raised. Technician B is also correct. In reverse flow cooling systems, the coolant flows from the radiator to the cylinder heads first. Therefore, both technicians are correct.

Question 19

A battery is being tested: Technician A says that a capacity (load) test will draw energy from the battery. Technician B says that a conductance test will test the battery without drawing energy from the battery. Who is correct?
A) A only
B) B only
C) Both A and B
D) Neither A nor B

Accepted Answer

Technician A is correct because a capacity (load) test does draw energy from the battery. Technician B is also correct because a conductance test measures the battery's ability to conduct electrical current without drawing a significant amount of energy from the battery. Therefore, both technicians are correct.

Question 20

For most engines and manufactures, it is acceptable for an engine to consume 1 quart for every 2000 miles.

Accepted Answer

This is a commonly cited guideline for oil consumption in modern engines. However, it is still important to check the specific recommendations for your engine and manufacturer.

Quiz 4: Engine Operating Systems

An engine that is hard to turn due to a mechanical problem will have a higher than normal amperes reading during a starter draw test.

All of the following are true about synthetic oils compared to traditional oils except:

During a battery terminal test, a voltage of 0.05 would indicate a poor connection in need of servicing.

A stuck closed pressure relief valve on an oil pump would result in low or no oil pressure.

Thermostats are being discussed. Technician A says that a stuck closed thermostat may cause engine overheating. Technician B says that it is possible to test a thermostat by submerging it in a container of water while heating it and watching a thermometer. Who is correct?

What additive in oil aides in the prevention of varnish buildup?

Technician A says that a fully charged car battery produces 12.6 volts. Technician B says that on top post batteries, the positive terminal is smaller than the negative to help prevent connecting in reverse polarity. Who is correct?

An engine has lower-than-specified oil pressure. Technician A says the oil pressure relief valve may be stuck closed. Technician B says there may be excessive clearance between the oil pump gears. Who is correct?

The starter motor spins the engine at about 200-250 rpm for starting purposes.

What category of oil will work for all automotive gasoline engines currently in use?

S-class motor oil should be used in diesel engines.

It is best to change motor oil when the engine is cold and the oil has had time to drain from all internal parts.

Motor oil is being discussed. Technician A says that the "W" in 10W-30 stands for "weight." Technician B says that thicker oils can cause lubrication problems in colder climates. Who is correct?

During an engine overhaul, oil pump replacement is very expensive and repairs are usually not necessary.

Technician A says that a defective PCV valve could cause excessive crankcase pressure. Technician B says that a defective PCV valve could cause an oil leak. Who is correct?

Shimming a starter is done to obtain the correct pinion-to-ring gear clearance.

Propylene glycol-based coolant is less toxic than ethylene glycol.

Technician A says that as pressure increases on the coolant in the cooling system, the boiling point is raised. Technician B says that on a reverse flow cooling system, the coolant flows from the radiator to the cylinder heads first. Who is correct?

A battery is being tested: Technician A says that a capacity (load) test will draw energy from the battery. Technician B says that a conductance test will test the battery without drawing energy from the battery. Who is correct?

For most engines and manufactures, it is acceptable for an engine to consume 1 quart for every 2000 miles.