ATEC 23 Final Study Guide
Ultra-low-sulfur diesel fuel has how much sulfur content?
A. 15 PPM
A typical oil pump can pump how many gallons per minute?
A. 3 to 6 gallons
For the best working position, the work should be?
A. At neck or head level
Which act or organization regulates air-conditioning refrigerant?
A. Clean Air Act (CAA)
What type of screwdriver should be used if there is very limited space above the head of the fastener? (CH 1 End)
A. Dead-blow hammer
An engine fails to reach normal operating temperature. Which is the most likely fault?
A. Defective thermostat
Used engine oil should be disposed of by all except one of the following methods.
A. Disposed of in regular trash
The diesel injection pump is usually driven by a?
A. Gear off the camshaft
Which method of blending ethanol with gasoline is the most accurate?
A. In-line
Which diesel injection system requires the use of a glow plug?
A. Indirect injection
How is diesel fuel ignited in a warm diesel engine?
A. Indirect injection (IDI)
Avoid topping off the fuel tank because
A. It can saturate the charcoal canister.
The proper term for Vice Grip is?
A. Locking pliers
Which alcohol is dangerous (toxic)?
A. Methanol
What type of screwdriver should be used if there is very limited space above the head of the fastener?
A. Offset screwdriver
What type of pump is a typical oil pump?
A. Positive displacement
Torque is expressed in units of?
A. Pound feet
What color is diesel fuel dyed if it is for off-road use only? (CH 7 Begin)
A. Red
Wetted asbestos dust is considered to be?
A. Solid waste
Technician A says that a crankshaft determines the stroke of an engine. Technician B says that the length of the connecting rod determines the stroke of an engine. Which technician is correct? (CH 3 End)
A. Technician A only
As the percentage of antifreeze in the coolant increases?
A. The freeze point decreases (up to a point)
When refueling a CNG vehicle, why is it recommended that the tank be filled to a high pressure?
A. The range of the vehicle is increased
Using ethanol-enhanced or reformulated gasoline can result in reduced fuel economy? (CH 5 End)
A. True
The upper portion of a two-part intake manifold is often called the_______.
C. Plenum
The oil pump pressure relief valve is also called
C. Pressure regulating valve
Liquefied petroleum gas (LPG) is also called?
C. Propane
Which statement is true about thermostats?
C. The temperature marked on the thermostat is the temperature at which the thermostat should start to open.
In typical engine lubrication systems, what components are the last to receive oil? (CH 9 End)
C. Valve train components
Hazardous materials include all of the following except? (CH 2 Begin)
C. Water
Why are the EGR gases cooled before entering the engine on some engines?
Cool exhaust gas is more effective at controlling NOX emissions
An oil filter should be hot drained for how long before disposing of the filter?
D. 12 Hours
The oil pressure warning light normally comes on to warn the driver if the oil pressure drops below.
D. 3 to 7 PS
One cylinder of an automotive four-stroke-cycle engine completes a cycle every ?
D. 720
What part should be removed to test cylinder compression on a diesel engine? (CH 4 End)
D. A glow plug
The correct location for the pads when hoisting or jacking the vehicle can often be found in the? (CH 1 Begin)
D. All of the above Service manual Owner's manual Shop manual
Diesel fuel additives are designed to?
D. All of the above Improve cetane rating Kill microbes Reduce cold filter plugging point (CFPP)
A stuck open thermostat can cause?
D. All of the above Lower fuel economy Increased exhaust emissions Failure of a state emission test
Methanol is also called?
D. All of the above Methyl alcohol Wood alcohol Methyl hydrate
Winter-blend gasoline? (CH 5 Begin)
D. All of the above Vaporizes more easily than summer-blend gasoline Has a higher RVP Can cause engine driveability problems if used during warm weather
What automotive devices may contain mercury? (CH 2 End)
D. All of the above Rear seat video displays Navigation displays HID headlights
Exposure to asbestos dust can cause what condition?
D. All of the above are Asbestosis Mesothelioma Lung cancer
A flex-fuel vehicle can be identified by?
D. Any of the above Emblems on the side, front, and/or rear of the vehicle VECI VIN
Ethanol can be produced from what products? (CH 6 Begin)
D. Any of the above Switchgrass Sugarcane Corn
Most manufacturers of vehicles equipped with diesel engines allow what type of biodiesel?
D. B5
The intake manifold of a port fuel-injected engine________.
D. Contains only air
To determine if a product or substance being used is hazardous, consult?
D. EPA Guidelines
Used coolant should be?
D. Either b or c Recycled Disposed of properly
Permanent antifreeze is mostly (CH 8 Begin)
D. Ethylene glycol
The proper term for channel locks is?
D. Multi-groove adjustable pilers
Air filters can remove particles and dirt as small as___.
B. 10 to 25 microns
Normal oil pump pressure in an engine is____PSI. (CH 9 Begin)
B. 10 to 60 PSI
How much compressed natural gas (CNG) does it require to achieve the energy of one gallon of gasoline?
B. 122 cubic feet
A normally aspirated automobile engine loses about _____power per 1,000 feet of altitude.
B. 3%
Intake charge velocity has to be___to prevent fuel droplet separation. (CH 10 Begin)
B. 50 feet per second
B20 biodiesel has how much regular diesel fuel?
B. 80%
E85 means that the fuel is made from?
B. 85% ethanol, 15% Gasoline
The weep hole on a water pump is located where?
B. Between the seal and the bearing
E-diesel is diesel fuel with what additive?
B. Ethanol
A water pump is a positive displacement-type pump?
B. False
Biodiesel is regular diesel fuel with vegetable oil added.
B. False
Producing liquid fuel from coal or natural gas usually uses which process? ( CH 6 End)
B. Fischer-Tropsch
What grade is most diesel fuel?
B. Grade #2
All overhead valve engines (CH 3 Begin)
B. Have the overhead valves in the head
How is diesel fuel ignited in a warm diesel engine? (CH 4 Begin)
B. Heat of compression
To avoid problems with the variation of gasoline, all government testing use____________as a fuel during testing procedures
B. Indolene
A high-strength bolt is identified by?
B. Lines on the head
Engine oil passages in an engine block are called
B. Oil galleries
Which is the most widely used alternative fuel?
B. Propane
When working with hand tools, always?
B. Pull a wrench - don't push a wrench
Gasoline should be stored in approved containers that include what color(s)?
B. Red Container
A fastener that uses threads on both ends is called a?
B. Stud
Technician A says that many engines use a windage tray in the oil pan. Technician B says that some engines are equipped with an oil cooler. Which technician is correct?
B. Technician B only
Technician A says that oil pressure is affected by the amount of main and rod bearing clearance. Technician B says that the oil pressure is lower when the oil gets hot than when it is cold. Which technician is correct?
B. Technician B only
Two technicians are discussing torque wrenches. Technician A says that a torque wrench is capable of tightening a fastener with more torque than a conventional breaker bar or ratchet. Technician B says that a torque wrench should be calibrated regularly for the most accurate results. Which technician is correct?
B. Technician B only
The coolant flow through the radiator is controlled by the?
B. Thermostat
A rotating force is called?
B. Torque
How many camshafts does a SOHC V-8 engine have?
B. Two
Glow plugs should have high resistance __________ when and lower resistance when_________?
B. Warm/cold
What color is diesel fuel dyed if it is for off-road use only?
B. Wax
Which diesel system supplies high-pressure diesel fuel to all of the injectors all of the time?
C. High-pressure common rail
The three phases of diesel ignition include?
C. Ignition delay,rapid combustion, controlled combustion
The normal operating temperature(coolant temperature) of an engine equipped with a 195°F thermostat is? (CH 8 End)
C. 195 F to 215 F
Exhaust passages are included in some intake manifolds. Technician A says that the exhaust passages are used for exhaust gas recirculation (EGR) systems. Technician B says that the exhaust heat is used to warm the intake charge on some engines equipped with a throttle-body-type fuel- injection system. Which technician is correct?
C. Both Technicians A and B
Technician A says that a cracked exhaust manifold can affect engine operation. Technician B says that a leaking lower intake manifold gasket could cause a vacuum leak. Which technician is correct?
C. Both Technicians A and B
Technician A says that some intake manifolds are plastic. Technician B says that some intake manifolds are constructed in two parts or sections: upper and lower. Which technician is correct? (CH 10 End)
C. Both Technicians A and B
Technician A says that the oil pump draws unfiltered oil from the bottom of the oil pan. Technician B says that the oil pump is driven from the front of the crankshaft in some engines. Which technician is correct?
C. Both Technicians A and B
Technician A says that a bleeder valve is located on many engines to allow air to escape when refilling the cooling sys- tem. Technician B says that a hose should be attached to the bleeder valve to allow any escaping coolant to be directed to a suitable container. Which technician is correct?
C. Both technicians A and B
Technician A says that in going to high altitudes, engines produce lower power. Technician B says that most engine control systems can compensate the air-fuel mixture for changes in altitude. Which technician is correct?
C. Both technicians A and B
Technician A says that spark knock, ping, and detonation are different names for abnormal combustion. Technician B says that any abnormal combustion raises the temperature and pressure inside the combustion chamber and can cause severe engine damage. Which technician is correct?
C. Both technicians A and B
Technician A says that the research octane number is higher than the motor octane number. Technician B says that the octane rating posted on fuel pumps is an average of the two ratings. Which technician is correct?
C. Both technicians A and B
What rating of diesel fuel indicates how well a diesel engine will start?
C. Cetane rating
All of the following are the proper ways to dispose of a drained oil filter except?
C. Disposed of in regular trash
Vapor lock can occur?
C. During both a and b As a result of excessive heat near fuel lines If a fuel line is restricted
Horsepower is expressed in units of?
C. Foot pounds per minute
Technician A says that glow plugs are used to help start a diesel engine and are shut off as soon as the engine starts. Technician B says that the glow plugs are turned off as soon as a flame is detected in the combustion chamber. Which technician is correct?
D. Neither Technician A or B
How many rotations of the crankshaft are required to complete each stroke of a four-stroke cycle engine?
D. One-Half
Why do many port fuel-injected engines use long intake manifold runners?
D. To increase low-RPM torque
What can be used to measure the alcohol content in gasoline?
D. either a or b graduated cylinder electronic tester
What fuel system component is used in a vehicle equipped with a diesel engine that is not usually used on the same vehicle when it is equipped with a gasoline engine?
D. water-fuel separator
A heated air intake system is usually necessary for proper cold-engine drivability on____.
Throttle-body fuel-injection systems