SMOG TEST 1QUESTIONS AND
ANSWERS WITH COMPLETE
SOLUTIONS ALREADY PASSED!!!
Camshaft and Crankshaft Speed
The camshaft turns at what speed relative to the crankshaft?
a) Half. In a standard four-stroke internal combustion engine, the crankshaft
rotates twice (720°) for every single rotation of the camshaft (360°). This
timing ensures that the valves open and close at the correct time in the cycle.
Combustion Completion
Burning of the air/fuel mixture is completed during the?
b) Power Stroke. The combustion process (the expansion of ignited gases)
begins just before Top Dead Center (TDC) at the end of the compression
stroke and is completed during the power stroke, where the expanding gases
force the piston downward.
Crankshaft Rotation per Stroke
How many degrees of crankshaft rotation does it take an engine to complete
three strokes?
c) 540 degrees. Each stroke (intake, compression, power, exhaust)
represents 180° of crankshaft rotation. Therefore, three strokes ($3 \times
180^\circ$) equals 540°. A full four-stroke cycle requires 720°.
How many degrees of crankshaft rotation does it take an engine to complete three
strokes?
a) 180 degrees
b) 260 degrees
c) 540 degrees
,d) 720 degrees -ANSWER ✔✔c) 540 degrees
A/F ratios leaner than 14.7 to 1 will create higher amounts of _____?
a) CO
b)CO2
c) NOx
d) H20 -ANSWER ✔✔c) NOx
The amount of air a cylinder actually draws in on the intake stroke is called ____?
a) Volumetric efficieny
b) horse power
c) torque
d)engine displacement -ANSWER ✔✔a) volumetric efficiency
High cylinder temperatures and pressures are the result of combining all of the
following, except:
a) Fuel and oxygen
b) ignition
c) compression
d) carbon dioxide -ANSWER ✔✔d) carbon dioxide
The EIS (Emission Inspection System) transmits test results to a BAR's central
database. What's the name of this databasea)
a) CHP ( California Highway Patrol)
b) VID ( Vehicle Information Database)
c) SAE (Society of Automotive Engineers)
, d) ARB (Air Resources Board) -ANSWER ✔✔b) VID ( Vehicle Information
Database)
"Directed vehicles" are required to be tested at which of the following stations?
a) repair only stations
b) non-star test & repair stations
c) Star test & repair stations only
d) all star certified smog stations -ANSWER ✔✔d) all star certified smog stations
The following automotive emissions are harmful, except _______?
a) hydrocarbons
b) carbon monoxide
c) oxides of nitrogen
d) carbon dioxide -ANSWER ✔✔d) carbon dioxide
Perfect combustion produces ___________?
a) argon and helium gases
b) hydrogen and chlorine
c) carbon dioxide and water
d) radon gas and carbon dioxide -ANSWER ✔✔c) carbon dioxide and water
Photochemical smog is the result of ________?
a) still air, sunlight, NOx and HC
b) still air, sunlight, NOx and CO
c) still air, Co and HC
ANSWERS WITH COMPLETE
SOLUTIONS ALREADY PASSED!!!
Camshaft and Crankshaft Speed
The camshaft turns at what speed relative to the crankshaft?
a) Half. In a standard four-stroke internal combustion engine, the crankshaft
rotates twice (720°) for every single rotation of the camshaft (360°). This
timing ensures that the valves open and close at the correct time in the cycle.
Combustion Completion
Burning of the air/fuel mixture is completed during the?
b) Power Stroke. The combustion process (the expansion of ignited gases)
begins just before Top Dead Center (TDC) at the end of the compression
stroke and is completed during the power stroke, where the expanding gases
force the piston downward.
Crankshaft Rotation per Stroke
How many degrees of crankshaft rotation does it take an engine to complete
three strokes?
c) 540 degrees. Each stroke (intake, compression, power, exhaust)
represents 180° of crankshaft rotation. Therefore, three strokes ($3 \times
180^\circ$) equals 540°. A full four-stroke cycle requires 720°.
How many degrees of crankshaft rotation does it take an engine to complete three
strokes?
a) 180 degrees
b) 260 degrees
c) 540 degrees
,d) 720 degrees -ANSWER ✔✔c) 540 degrees
A/F ratios leaner than 14.7 to 1 will create higher amounts of _____?
a) CO
b)CO2
c) NOx
d) H20 -ANSWER ✔✔c) NOx
The amount of air a cylinder actually draws in on the intake stroke is called ____?
a) Volumetric efficieny
b) horse power
c) torque
d)engine displacement -ANSWER ✔✔a) volumetric efficiency
High cylinder temperatures and pressures are the result of combining all of the
following, except:
a) Fuel and oxygen
b) ignition
c) compression
d) carbon dioxide -ANSWER ✔✔d) carbon dioxide
The EIS (Emission Inspection System) transmits test results to a BAR's central
database. What's the name of this databasea)
a) CHP ( California Highway Patrol)
b) VID ( Vehicle Information Database)
c) SAE (Society of Automotive Engineers)
, d) ARB (Air Resources Board) -ANSWER ✔✔b) VID ( Vehicle Information
Database)
"Directed vehicles" are required to be tested at which of the following stations?
a) repair only stations
b) non-star test & repair stations
c) Star test & repair stations only
d) all star certified smog stations -ANSWER ✔✔d) all star certified smog stations
The following automotive emissions are harmful, except _______?
a) hydrocarbons
b) carbon monoxide
c) oxides of nitrogen
d) carbon dioxide -ANSWER ✔✔d) carbon dioxide
Perfect combustion produces ___________?
a) argon and helium gases
b) hydrogen and chlorine
c) carbon dioxide and water
d) radon gas and carbon dioxide -ANSWER ✔✔c) carbon dioxide and water
Photochemical smog is the result of ________?
a) still air, sunlight, NOx and HC
b) still air, sunlight, NOx and CO
c) still air, Co and HC
