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1. Technician A says that when a car runs too rich, you can
    smell the CO. Technician B says that CO is odorless.  Who
    is right?
      a. A only
      b. B only
      c. Both A and B
      d. Neither A nor B

2. The catalytic convertor
      a. reduces exhaust noise to a minimum level
      b. is only required on engines that burn regular
            gasoline
      c. helps to cool the exhaust
      d. changes exhaust pollutants into harmless emissions

3. The EGR system reduces formation of NOx by
        a. creating a rich air/fuel mixture
        b. reducing combustion temperatures
        c. increasing peak combustion temperatures
        d. increasing combustion pressures

4. Photochemical smog is created when ____ mixes with NOx and
   HC emissions.
        a. sunlight
        b. particulates
        c. smog
        d. CO

5. Technician A says that the misfire code on OBD will indicate
   which cylinder is misfiring. Technician B says that the
   misfire code will only indicate a misfire, but will not
     identify the cylinder.  Who is right?
         a. A only
         b. B only
         c. Both A and B
         d. Neither A nor B

6. The purpose of the catalytic convertor is to
         a. change the harmful emissions into safe gases
         b. help the engine warm up faster
         c. recirculate exhaust into the engine
         d. assist the muffler to silence the engine

7. Technician A says it is against the law to remove or
   disconnect emission control devices. Technician B says
   removing or disconnecting emission controls on vehicles
   equipped with computers causes poor performance and fuel
   economy. Who is correct?
          a. A only
          b. B only
          c. Both A and B
          d. Neither A nor B

8. OBD2 requires manufacturers to use
        a. standard codes
        b. a standard DLC connector
        c. two oxygen sensors
        d. all of the above

9. High combustion temperatures tend to produce
        a. carbon monoxide
        b. oxides of nitrogen
        c. hydrocarbons
        d. carbon dioxide

10. OBD 2 systems all must have
          a. an HO2 sensor downstream of the convertor
          b. a MAP sensor in the fuel tank
          c. a standardized DLC
          d. all of the above

11. What is the compression ratio ideal for reducing emissions?
          a. 8:1
          b..10:1
          c. 11:1
          d. 12:1

12. The 02 sensor is mounted in the
          a. air intake
          b. MAF sensor
          c. exhaust system
          d. intake manifold

13. The PCV valve and charcoal canister are methods of
    controlling:
          a. NOx
          b. HO
          c. CO
          d. All of the above

14. On the EGR system, _____ is sent back to the intake.
          a. catalyst
          b. exhaust gas
          c. liquid toolant
          d. blow-by

15. Technician A says leaner air/fuel ratios reduce hydrocarbons
    but increase NOx Technician B says that additional
      pollution controls are used to reduce NOx. Who is correct?
          a. A only
          b. B only
          c. Both A and B
          d. Neither A nor B

16. On OBD 2 codes, the letter P at the start of the code stands
    for
          a. passive restraint system
          b. powertrain
          c. pressure fault
          d. passenger car

17. The conventional convertor changes hydrocarbons and carbon
    monoxide into
          a. HC and carbon dioxide
          b. NOx and water vapour
          c. nitrous oxides
          d. carbon dioxide and water vapour

18. Technician A says that OBD 2 DLC's are required to be
    located in the same place on all vehicles. Technician B
    says that the DLC can be located at different spots as long
    as there is a notifying tag located under the dashboard.
    Who is right?
          a. A only
          b. B only
          c. Both A and B
          d. Neither A nor B

19. Which of the following emissions increase with combustion
    temperatures?
          a. SOx
          b. HC
          c. CO
          d. NOX

20. Technician A says the EGR valve should be closed when the
    engine is cold. Technician B says the EGR valve should be
    closed at idle. Who is right?
          a. A only
          b. B only
          c. Both A and B
          d. Neither A nor B

21. The carbon canister
          a. holds fuel yapours until the engine can burn them
          b. is manufactured for Ford vehicles only
          c. supplies carbon to neutralize hydrocarbons
          d. ignites evaporated hydrocarbons

22. Technician A says computer controls can be used on the EGR
    system. technician B says that computer controls can be
      used on the PCV system. Who is correct?
          a. A only
          b. B only
          c. Both A and B
          d. Neither A nor B

23. The purpose of the PCV system is to
          a. regulate the flow of fresh air to the intake
          b. provide fresh air to the convertor
          c. increase fuel economy
          d. remove blowby gases from the crankcase

24. Which of the following is not considered a pollution
    by-product from gasoline consumption?
          a. hydrogen
          b. hydrocarbons
          c. nitrogen oxides
          d. carbon monoxide

25. Which of the following are considered good checks to make on
    pollution control systems?
          a. carbon canister filter
          b. PCV valve operation
          c. routing of vacuum hoses
          d. all of the above

KEY - QUIZ 6
 

1. B
2. D
3. B
4. A
5. A
6. A
7. C
8. D
9. B
10. D
11. A
12. C
13. B
14. B
15. C
16. B
17. D
18. B
19. D
20. C
21. A
22. A
23. D
24. A
25. D