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Title: I need assist with Engine Emissions Control course Post by: Meshoo Al M on Sep 26, 2018 1. Technician A says that a 3 × 5 card should be held against the oil fill opening if the positive crankcase ventilation (PCV) system is operating correctly. Technician B says that if a PCV valve rattles, it's working properly. Who is correct?
A. Neither Technician A nor B B. Technician A C. Both Technicians A and B D. Technician B 2. Which of the following exhaust gases are least likely to be measured in percentages? A. CO (carbon monoxide) B. HC (hydrocarbon) C. CO2 (carbon dioxide) D. O2 (oxygen) 3. Oxides of nitrogen result from a combination of nitrogen and A. hydrogen. B. argon. C. oxygen. D. carbon. 4. Technician A says that carbon monoxide (CO) and hydrocarbon (HC) levels should increase if the air injection reactor (AIR) hoses are pinched off. Technician B says that a defective drive belt may cause AIR system problems. Who is correct? A. Technician A B. Both Technicians A and B C. Neither Technician A nor B D. Technician B 5. Technician A says that the most efficient method of EVAP system leak detection is introducing smoke under low pressure from a machine specifically designed for this purpose. Technician B says that nitrogen gas pressurization uses nitrogen gas under a very low pressure (lower than 1 psi) in the fuel system; you listen for escaping air with amplified headphones. Who is correct? A. Both Technicians A and B B. Technician B C. Neither Technician A nor B D. Technician A 6. To avoid excessive catalyst temperatures and the possibility of fuel vapors reaching the converter, the following rules are being discussed: Technician A says that it's okay to use any fuel additives or cleaners in the fuel system. Technician B says that you should repair engine problems such as dieseling, misfiring, or stumbling as soon as possible. Who is correct? A. Technician A B. Both Technicians A and B C. Technician B D. Neither Technician A nor B 7. A scan tool check of the canister purge valve control solenoid shows that it's always open. Which of the following could be the cause? A. Defective powertrain control module (PCM) B. Vacuum source problem C. Broken diaphragm D. Vacuum passage restriction 8. Two technicians are explaining what exhaust gas emissions tell you about engine operation. Technician A says that the higher the level of CO2 in the exhaust stream, the more efficiently the engine is operating. Technician B says that CO2 levels of 20 to 25 percent are considered acceptable. A. Technician B B. Neither Technician A nor B C. Both Technicians A and B D. Technician A 9. A maximum reading of _______ parts per million (PPM) of NOx under loaded driving conditions generally means that the vehicle will pass an enhanced I/M roller test. A. 2,000 B. 100 C. 1,000 D. 500 10. The _______ valve protects the air pump from reverse-exhaust pressure. A. gulp B. diverter C. positive crankcase ventilation (PCV) D. check 11. The OBD-II catalytic converter monitor uses _______ sensor(s) to monitor catalytic converter efficiency. A. an engine coolant temperature B. front and rear catalyst temperature C. front and rear O2 D. a throttle position 12. Which of these items is least likely to cause an exhaust emissions test failure as a result of excessive NOx emissions? A. Poor flow through the EGR system B. Spark plug hot range C. Defective fuel injector D. Defective oxygen sensor 13. You're using a scan tool to evaluate the overall exhaust gas recirculation (EGR) system operation on a vacuum-type EGR system. Which one of the following is the best parameter to monitor with a scan tool? A. EGR temperature sensor voltage during cruise B. EGR valve operation during deceleration C. EGR valve operation during acceleration D. EGR temperature sensor voltage at idle 14. A technician suspects that the exhaust gas recirculation (EGR) valve is closed. Which of the following would indicate a closed EGR valve? A. Stalling B. Engine surge C. Rough idle D. Spark knock 15. Which of these evaporative control valve(s) is/are normally open? A. Both the canister purge and canister vent valve B. Neither the canister purge nor canister vent valve C. Canister purge valve D. Canister vent valve 16. Which of these items will least likely increase pressure in the evaporative emission control system? A. Inlet fuel to the fuel pump B. Fuel temperature C. Returned fuel from the fuel-injection system D. Volatility of the fuel 17. While servicing a vehicle, you retrieve the diagnostic code P0401, "EGR (exhaust gas recirculation) flow insufficient." Which of these is the most likely cause? A. Stuck-open EGR valve B. Electrical wiring shorted to voltage C. Clogged EGR ports or passages D. Electrical wiring shorted to ground 18. As the efficiency of the catalytic converter drops through deterioration, the switching rate of the rear O2 sensor signal will start to look like the front O2 sensor signal. When the rear O2 sensor signal reaches approximately 75 percent of the front O2 sensor, which of the following is the result? A. The catalyst beads in the converter should be changed. B. The diagnostic trouble code is stored with the MIL on. C. A one-trip flag is set with a code stored, but the MIL isn't activated. D. The catalytic converter should be replaced. 19. Oxygen combines with nitrogen in the air to form NOx at about _______ °F. A. 1500 B. 50 C. 000 D. 2500 20. What term describes a catalytic converter as it reaches its effective temperature? A. Consumption B. Light-off C. Firing D. Initiation Title: Re: I need assist with Engine Emissions Control course Post by: bio_man on Sep 26, 2018 Content hidden
Title: Re: I need assist with Engine Emissions Control course Post by: Luis Bonilla on Jan 9, 2020 ,,
Title: Re: I need assist with Engine Emissions Control course Post by: Denise Denise on Jun 3, 2020 can someone please do 15.
Title: Re: I need assist with Engine Emissions Control course Post by: dhelgeso on Jun 3, 2020 Quote can someone please do 15. D - Canister vent valve is an evaporative control valve that is normally open.Title: Re: I need assist with Engine Emissions Control course Post by: RU KH IA on Jun 22, 2020 can someone do 13
Title: Re: I need assist with Engine Emissions Control course Post by: byakushisakura on Jun 25, 2020 can someone do 13 EGR temperature sensor voltage during part-throttle On systems that use manifold vacuum, the EGR solenoid valve is commanded ON during part-throttle conditions and moderate load. Title: Re: I need assist with Engine Emissions Control course Post by: Jacob The Legend on Jul 29, 2020 can someone do 8
Title: Re: I need assist with Engine Emissions Control course Post by: swolfe15 on Jul 29, 2020 8. Two technicians are explaining what exhaust gas emissions tell you about engine operation. Technician A says that the higher the level of CO2 in the exhaust stream, the more efficiently the engine is operating. Technician B says that CO2 levels of 20 to 25 percent are considered acceptable. A. Technician B B. Neither Technician A nor B C. Both Technicians A and B D. Technician A Tech A. is right Carbon dioxide (CO2) is a measure of efficiency. – The higher the level of CO2 in the exhaust stream, the more efficiently the engine is operating. Title: Re: I need assist with Engine Emissions Control course Post by: Daniel Tresilus on Sep 1, 2020 Can someone do 1
Title: Re: I need assist with Engine Emissions Control course Post by: William Buffington on Nov 1, 2020 can someone do #12 please
Title: Re: I need assist with Engine Emissions Control course Post by: samah952 on Nov 1, 2020 12. Which of these items is least likely to cause an exhaust emissions test failure as a result of excessive NOx emissions? A. Poor flow through the EGR system B. Spark plug hot range C. Defective fuel injector D. Defective oxygen sensor High NOx emissions can occur when an engine's air-fuel mixture is too lean. A Title: Re: I need assist with Engine Emissions Control course Post by: Aislynne Bradley on Dec 29, 2020 can someone do #1 please asap
Title: Re: I need assist with Engine Emissions Control course Post by: bio_man on Dec 29, 2020 can someone do #1 please asap Found it here: https://biology-forums.com/index.php?topic=1841314.0 Title: Re: I need assist with Engine Emissions Control course Post by: Adam638 on Oct 8, 2021 7. Technician A says that manually opening an exhaust gas recirculation (EGR) valve with a vacuum pump or scan tool will cause the engine to idle roughly or stall. Technician B says that blocking the EGR valve passages will have no effect on the OBD-II. Who is correct?
8. Oxides of nitrogen (NOx) contribute to the formation of 7. Technician A says that manually opening an exhaust gas recirculation (EGR) valve with a vacuum pump or scan tool will cause the engine to idle roughly or stall. Technician B says that blocking the EGR valve passages will have no effect on the OBD-II. Who is correct? 8. Oxides of nitrogen (NOx) contribute to the formation of Title: Re: I need assist with Engine Emissions Control course Post by: bio_man on Oct 9, 2021 7. Technician A says that manually opening an exhaust gas recirculation (EGR) valve with a vacuum pump or scan tool will cause the engine to idle roughly or stall. Technician B says that blocking the EGR valve passages will have no effect on the OBD-II. Who is correct? Technician A is correct. Opening the exhaust gas recirculation (EGR) valve manually with a vacuum pump cause the engine to roughly idle or stall. This is because the exhaust gas is recirculated to the engine intake valve and improve the performance by exchanging heat with the fresh air. The statement of technician A is correct. While the technician B statement says incorrect. The blocking of EGR valve passages causes problems in the engine performance. This is also diagnosed on the OBD-II. Please start a new topic if you'd like to see the next question answer :) |