Automotive- Service Excellence-
Questions and Answers.
Smog - Answer is created by a photochemical reaction
The three major pollutants in automobile exhaust are - Answer Carbon monoxide, oxides of
nitrogen, hydrocarbons
Fuel evaporation accounts for what percentage of total HC emissions? - Answer 20 percent
Particulate matter is - Answer Microscopic particles suspended in the atmosphere.
Carbon monoxide is a result of - Answer Incomplete combustion.
Sulfur oxides are harmful because they - Answer Combine with water to form sulfuric acid.
Ozone is created by a combination of sunlight, still air, and - Answer High levels of CO and NOx
A temperature inversion increases air pollution by - Answer Forming a " lid " over stagnant air
U.S federal emission limits are established by the - Answer Enviromental Protection Agency
Corporate Average Fuel Economy (CAFE) standards were rolled back in the - Answer 1990s
Sulfur by-products of combustion can combine with water to form - Answer Sulfuric acid
The only major type of pollutant that comes from a vehicle source other than the exhaust is -
Answer CO
OBD-1 seeks to decrease levels of automobile emission by - Answer Alerting the driver to a
potential problem and monitoring the efficiency with which certain systems are operating.
An automotive internal combustion engine - Answer has pistons that are driven downward by
explosions in the combustion chamber
A spark plug fires near the end of the - Answer Power stroke
, The camshaft rotates at - Answer Half the speed of the crankshaft
The bore is the diameter of the - Answer Cylinder
The four-stroke cycle operates in what order? - Answer Intake, compression, power, exhaust
Diesel engines - Answer Produce ignition by heat of compression
How many strokes of a piston are required to turn the crankshaft through 360 degrees? -
Answer Two
A "retarded spark" is one that occurs - Answer After top dead center
An internal combustion engine is an efficient use of available energy because - Answer The
combustion of the fuel produces more energy than is required to compress and fire it
The typical ignition interval of an inline 6-cylinder engine is - Answer 720 degrees / 6 = 120
degrees
How many sparks (spark plug firings) per crankshaft revolutions are required by a typical 8-
cylinder engine? - Answer 4
The firing order of an engine - Answer Is stated in reference books and on the cylinder block
In a four-stroke engine, the piston is driven down in the cylinder by expanding gases during the
_____________ stroke. - Answer Power
To change cubic centimeters to cubic inches, multiply by - Answer 0.061
Compression ratio is - Answer Total volume divided by clearance volume
A disadvantage of gasoline is that it - Answer Produces pollutants upon combustion
Volumetric efficiency - Answer Is the theoretical maximum air volume that can be drawn into
an engine
Questions and Answers.
Smog - Answer is created by a photochemical reaction
The three major pollutants in automobile exhaust are - Answer Carbon monoxide, oxides of
nitrogen, hydrocarbons
Fuel evaporation accounts for what percentage of total HC emissions? - Answer 20 percent
Particulate matter is - Answer Microscopic particles suspended in the atmosphere.
Carbon monoxide is a result of - Answer Incomplete combustion.
Sulfur oxides are harmful because they - Answer Combine with water to form sulfuric acid.
Ozone is created by a combination of sunlight, still air, and - Answer High levels of CO and NOx
A temperature inversion increases air pollution by - Answer Forming a " lid " over stagnant air
U.S federal emission limits are established by the - Answer Enviromental Protection Agency
Corporate Average Fuel Economy (CAFE) standards were rolled back in the - Answer 1990s
Sulfur by-products of combustion can combine with water to form - Answer Sulfuric acid
The only major type of pollutant that comes from a vehicle source other than the exhaust is -
Answer CO
OBD-1 seeks to decrease levels of automobile emission by - Answer Alerting the driver to a
potential problem and monitoring the efficiency with which certain systems are operating.
An automotive internal combustion engine - Answer has pistons that are driven downward by
explosions in the combustion chamber
A spark plug fires near the end of the - Answer Power stroke
, The camshaft rotates at - Answer Half the speed of the crankshaft
The bore is the diameter of the - Answer Cylinder
The four-stroke cycle operates in what order? - Answer Intake, compression, power, exhaust
Diesel engines - Answer Produce ignition by heat of compression
How many strokes of a piston are required to turn the crankshaft through 360 degrees? -
Answer Two
A "retarded spark" is one that occurs - Answer After top dead center
An internal combustion engine is an efficient use of available energy because - Answer The
combustion of the fuel produces more energy than is required to compress and fire it
The typical ignition interval of an inline 6-cylinder engine is - Answer 720 degrees / 6 = 120
degrees
How many sparks (spark plug firings) per crankshaft revolutions are required by a typical 8-
cylinder engine? - Answer 4
The firing order of an engine - Answer Is stated in reference books and on the cylinder block
In a four-stroke engine, the piston is driven down in the cylinder by expanding gases during the
_____________ stroke. - Answer Power
To change cubic centimeters to cubic inches, multiply by - Answer 0.061
Compression ratio is - Answer Total volume divided by clearance volume
A disadvantage of gasoline is that it - Answer Produces pollutants upon combustion
Volumetric efficiency - Answer Is the theoretical maximum air volume that can be drawn into
an engine
