Note: Answer key is found below the questions. 

 1) On OBD II compliant V6, V8 and V10 engines, there are usually two upstream oxygen sensors, one in each:
    A. intake manifold        B. vacuum canister
    C. exhaust manifold        D. cylinder head
 
2) Which of these is NOT a type of O2 sensor used in automotive vehicles?
    A. zirconia            B. titania            C. iridium             
    D. heated planar        E. wide-band
 
3) On later-model vehicles with OBD II (some 1994 and ‘95 models, and all 1996-and-newer models), one or more
        additional oxygen sensors may be found mounted after the ___________  to monitor converter efficiency.
    A. muffler            B. exhaust headers
    C. exhaust ports        D. catalytic converter
 
4) An O2 sensor produces a ________ that changes when the amount of unburned oxygen in the exhaust changes.
    A. gas            B. voltage
    C. firing            D. pollutant
 
5) Oxygen sensors mounted after the catalytic converter are referred to as the ___________ O2 sensors.
    A. downstream        B. converter
    C. cat-back            D. upstream
 
6) When the fuel mixture is lean, it means that there is more _________ in the exhaust.
    A. fuel            B. oxygen
    C. carbon            D. emissions
 
7) O2 sensors will trigger a diagnostic trouble code (DTC) on OBD II compliant vehicles, turning on the Malfunction
        Indicator Lamp (MIL) when tailpipe emissions are estimated to exceed federal limits by:
    A. 1.5 times            B. 2.5 times
    C. 5 times            D. 10 times
 
8) Heated oxygen sensors have an internal ______that brings the sensor up to operating temperature more quickly than
        an unheated sensor.
    A. hot adjuster        B. combustor
    C. heater circuit        D. temperature resonator
 
9) An oxygen sensor must be hot – ____________ – before it will generate a voltage signal.
    A. about 200 to 250° F        B. about 400 to 500° F
    C.  about 600 to 650° F    D. about 800 to 850° F
 
10) A defective oxygen sensor heater circuit can:
      A. prevent the engine management system from going into closed loop.          B. set DTCs in memory.
      C. prevent on-board diagnostic tests from running.                D. all of the above

 

Answers to the November Pop Quiz are below….

Scroll down here. 

 

 

 

 

 

 

 

 

 

 

ANSWER KEY

1) C. exhaust manifold

2) C. iridium

3) D. catalytic converter

4) B. voltage

5) A. downstream

6) B. oxygen

7) A. 1.5 times

8) C. heater circuit

9)  C.  about 600 to 650° F

10)  D. all of the above