Deck 4: Engine Operating Systems

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.

Answer 1

True

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

Answer 2

C

Question 3

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

Answer 3

False

Question 4

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

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

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

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

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

Question 9

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

Question 10

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

A) SL
B) SO
C) SM
D) SN

Question 11

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

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.

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

Question 14

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

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

Question 16

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

Question 17

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

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

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

Question 20

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

Question 21

Technician A says that oil pumps are all negative displacement types. Technician B says that many oil pumps are driven by the front of the crankshaft. Who is correct?

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

Question 22

What part is attached to the cooling system and designed to warm the passenger compartment?

Question 23

Which PCM input sensor measures the pressure in the intake manifold?

A) MAF sensor
B) MAP sensor
C) TP sensor
D) ECT sensor

Question 24

Cooling systems are being discussed. Technician A says that removing the radiator cap should only be done when the engine is cold. Technician B says that most cooling systems are filled with a mix of 50/50 antifreeze to water. Who is correct?

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

Question 25

A car has a no-crank situation. The starter motor spins, but the engine does not rotate. What is the most likely cause?

A) a hydrostatic lock
B) a dead battery
C) a defective starter drive
D) a cracked crank pulley

Question 26

What component helps the engine to heat up to operating temperature as quickly as possible?

Question 27

As coolant temperature increases, the resistance of the typical NTC (Negative Temperature Coefficient) engine coolant temperature sensor:

A) Decreases
B) Increases
C) Does not change
D) None of the above

Question 28

What is used with chemical dye to aid in finding external oil leaks?

Question 29

Where are the most common locations for oil leakage?

Question 30

How do OHV engines typically deliver pressurized oil to the upper part of the engine and valvetrain?

Question 31

The cetane rating of diesel fuel is an indication of:

A) How quickly the fuel burns
B) The sulfur content
C) The percentage of water content
D) How easily the fuel ignites

Question 32

At sea level, what is the boiling point of water written in Fahrenheit and Celsius?

Question 33

All of the following API classifications of oil are currently in use EXCEPT ____.

A) SM
B) SN
C) SL
D) SK

Question 34

Technician A says that AGM batteries should only be tested using a conductance tester. Technician B says that AGM batteries should only be charged using a special charger. Who is correct?

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

Question 35

Technician A says that batteries can be cleaned with a baking soda and water solution. Technician B says that a baking soda and water solution may be used if a battery failed the battery case test. Who is correct?

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

Question 36

Technician A says gasoline that is used in year-round warm climates has the same volatility as a fuel blended for use in colder winter climates. Technician B says a fuel with too high of a volatility in warm climates can cause vapor lock.

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

Question 37

At the normal service interval for an oil change, the technician notices the oil level reads just below the normal level on the dipstick before beginning to drain the oil. Technician A says that all engines will consume some amount of oil within the normal service interval. Technician B says that the technician should check any TSBs related to oil consumption and inform the customer. Who is correct?

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

Question 38

Technician A says engine cooling fans are only necessary when the vehicle is moving slowly or stopped. Technician B says modern aerodynamic shapes have increased the need for operating the cooling fan. Who is correct?

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

Question 39

While performing a starter draw test on a car, it is noted that the starter has a slow cranking speed and a lower than normal amperage draw. What is the most likely cause?

A) worn starter brushes
B) worn starter bushings
C) incorrect ignition timing
D) hydrolocked engine

Question 40

All of the following could cause low oil pressure during a pressure test EXCEPT ____.

A) excessive bearing clearance
B) gas dilution
C) oil pump wear
D) tight valve adjustment

Question 41

What are the different safety concerns related to handling lead acid batteries?

Question 42

Describe the operation of the radiator cap on a non-pressurized reservoir system.

Question 43

What turns on and off the cooling fan on most vehicles today?

Question 44

Describe the purpose and operation of the engine thermostat.

Question 45

What type of antifreeze is not recommended by any vehicle manufacturers?

Question 46

Explain the purpose and functions of the oil filter.

Question 47

What is the most common type of sensor used for monitoring the cooling system?

Question 48

What percent of charge must a battery have to perform an accurate capacity test?

Question 49

Describe the steps taken to perform and oil pressure test.

Question 50

What different jobs are performed by coolant in the cooling system?