Emissions Flashcards
A three way catalytic converter is a:
a. Reduction catalytic converter b. Oxidizing catalytic converter c. A and B d. Normal catalytic converter
c. A and B
A two way catalytic converter is a:
a. Reduction catalytic converter b. Oxidizing catalytic converter c. Pre-heated catalytic converter d. Normal catalytic converter
b. Oxidizing catalytic converter
Reduction catalytic converters reduce which emission gases?
a. Hydro carbons b. Carbon monoxide c. Carbon dioxide d. NOx
d. NOx
Oxidizing catalytic converters reduce which emission gases?
a. Hydro carbons b. Carbon monoxide c. A and B d. NOx
c. A and B
What is the material in a two way catalytic converter that helps reduce emission gases?
a. Water and carbon dioxide b. Aluminum and bronze c. Platinum and palladium d. Brass and silver
c. Platinum and palladium
What is the material in a three way catalytic converter that helps reduce emission gases?
a. Water, carbon dioxide, and nitrogen b. Aluminum, bronze, and copper c. Platinum, palladium and rhodium d. Brass, silver, and gold
c. Platinum, palladium, and rhodium
Where does the air pump inject the air into?
a. Exhaust manifold b. Carburetor c. Intake manifold d. Air cleaner housing
a. Exhaust manifold
When a catalytic converter is cold, it:
a. Functions at 50% efficiency b. Functions at 100% efficiency c. Functions at 25% efficiency d. Does not function at all
d. Does not function at all
A catalytic converter has an engine input of 100 PPM HC and an output of 200 PPM HC. How efficient is the catalytic converter?
a. 100% b. 80% c. 60% d. 40%
b. 80%
When using an exhaust analyzer, the exhaust probe tip must be inserter up the tail pipe:
a. At least 2 cm b. 10 cm c. 20 cm d. Fully so it cannot draw in any air
d. Fully so it cannot draw in any air
The three primary regulated emission gases are:
a. O2, CO2, and HC b. O2, HC, and NOx c. CO, HC, and NOx d. HC, CO2 and NOx
c. CO, HC, and NOx
NOx is produced under which condition?
a. Rich AFR b. A thermostat stuck open c. A leak in the exhaust system d. High combustion temperature
d. High combustion temperature
High levels of O2 in the exhaust sample indicate:
a. A rich AFR b. A lean AFR c. A leak in the exhaust system d. Either B or C
d. Either B or C
If we could create perfect combustion in a gasoline engine, the only gases emitted from the tail pipe would be:
a. HC, CO, and O2 b. CO2, H2O, and N2 c. CO, O2, and NOx d. O2, N2, and H2
b. CO2, H2O, and N2
CO is formed when there is:
a. A shortage of fuel b. An excess of fuel c. A shortage of oxygen d. Either B or C
d. Either B or C
Good levels of O2 and CO2 in the exhaust can only occur when:
a. There is a lean misfire b. There is a rich misfire c. The AFR is correct and combustion is efficient d. There is an electrical misfire
c. The AFR is correct and combustion is efficient
If the EGR valve is open at idle:
a. The engine will run rough or stall b. The engine idle speed will increase c. This is a normal situation d. CO will be reduced
a. the engine will run rough or stall
A positive exhaust back pressure regulator transducer:
a. Closes an air bleed allowing vacuum to open the EGR valve b. Uses exhaust back-pressure to open the EGR valve c. Prevents the EGR valve from opening with a cold engine d. Prevents back pressure from developing in the exhaust system.
b. Uses exhaust back-pressure to open the EGR valve
On a computer controlled EGR system, the check engine light may come on if:
a. The EGR valve fails to operate b. Exhaust to intake passage is plugged c. EGR valve does not seal d. All of the above
d. All of the above
On computer controlled EGR systems, the scan tool can:
a. Provide the DTC b. Activate the EGR valve c. Perform the EGR system functional test d. All of the above
d. All of the above
Allowing exhaust gases into the intake manifold at the appropriate time:
a. Reduces combustion temperature, preventing nitrogen and oxygen gases from chemically bonding b. Increase combustion temperature to burn off nitrogen oxide c. Increase engine efficiency d. None of the above
a. Reduces combustion temperature, preventing nitrogen and oxygen gases from chemically bonding
Smog is the result of:
a. Sunlight reacting photo chemically will NOx and HC b. Fog mixture with NOx c. CO combining with HC and sunlight d. CO combining with NOx
a. sunlight reacting photo chemically with NOx and HC
The size of the carbon canister used on a vehicle depends on the:
a. Amount of space under the hood b. Engine size c. Size of the vehicle d. Fuel carrying capacity of the vehicle
d. Fuel carrying capacity of the vehicle
Purging the EVAP system is described as:
a. Capturing the vapors from the fuel tank b. Storing vapor in the carbon canister c. Drawing the vapors from the carbon canister d. None of the above
c. Drawing the vapors from the carbon canister
Purge systems can be controlled by:
a. The PCM b. A thermal vacuum switch c. A pulse width modulated solenoid d. A and B only e. All of the above
e. All of the above
Enhanced evaporative emission systems:
a. Are PCM controlled evaporator systems b. Can detect a very small EVAP system leak c. Can capture vapors while refueling d. Use PWM solenoids
b. Can detect a very small EVAP system leak
While filling a vehicle with an onboard refueling vapor recovery system, it is normal for:
a. The carbon canister to get hot b. The canister to fill with liquid fuel c. The tank to fill slowly d. Fuel vapors to leak into the atmosphere
a. The carbon canister to get hot
Which of the following problems can be caused by a malfunctioning onboard refueling vapor recovery system?
a. Difficult or slow to fill b. Tank overfills c. Fuel odor d. A and B only e. All of the above
e. All of the above
When an engine is run without a thermostat, which of the following conditions would be the most likely to result?
a. Higher HC and lower CO emissions b. Higher NOx emissions c. Engine overheats d. Poor acceleration
a. Higher HC and lower CO emissions
Under what conditions is a vehicle’s emission system checked with an exhaust analyzer?
a. At stall speed b. Under heavy throttle and high speed c. At cruising speed and moderate throttle d. Over 100 km/h
a. At stall speed
