Meter Usage And Circuit Diagnosis

25 Questions | Total Attempts: 3980

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Meter Usage And Circuit Diagnosis

Chapter 37


Questions and Answers
  • 1. 
    What materials make a good insulator?
    • A. 

      Copper and aluminum

    • B. 

      Ceramic and plastic

    • C. 

      Both A and B

    • D. 

      None of the above

  • 2. 
    Tech A says AC stands for alternating voltage. Tech B says DC is used in electric motors on most hybrid vehicles. Who is correct?
    • A. 

      Tech A

    • B. 

      Tech B

    • C. 

      Both Techs A and B

    • D. 

      Neither Tech A nor B

  • 3. 
    Tech A says high resistance causes an increase in current flow. Tech B says a voltage drop is another name for high resistance. Who is correct?
    • A. 

      Tech A

    • B. 

      Tech B

    • C. 

      Both Techs A and B

    • D. 

      Neither Tech A nor B

  • 4. 
    Tech A says parallel circuits are like links in a chain. Tech B says total current in a parallel circuit equals the sum of the current flowing in each branch of the circuit. Who is correct?
    • A. 

      Tech A

    • B. 

      Tech B

    • C. 

      Both Techs A and B

    • D. 

      Neither Tech A nor B

  • 5. 
    Tech A says relays are turned on and off by a small amount of current. Tech B says there are two types of relays: normally closed (NC) and normally open (NO) types. Who is correct?
    • A. 

      Tech A

    • B. 

      Tech B

    • C. 

      Both Techs A and B

    • D. 

      Neither Tech A nor B

  • 6. 
    What does DVOM stand for?
    • A. 

      Digital volt–hour meter

    • B. 

      Digital volt-ohmmeter

    • C. 

      Digital valve ohmmeter

    • D. 

      Digital variable oval meter

  • 7. 
    When reading a digital volt-ohmmeter (DVOM), you have a reading of 2168 mV, which is the same as:
    • A. 

      2168 millivolts.

    • B. 

      2.168 volts.

    • C. 

      1000 mV.

    • D. 

      Both A and B

  • 8. 
    When probing wires, you should do all these EXCEPT:
    • A. 

      Back probe when possible.

    • B. 

      Use caution when piercing wiring not to damage the wire internally.

    • C. 

      Reinsulate the hole with room temperature vulcanizing silicone.

    • D. 

      Never use excessive force.

  • 9. 
    Tech A says you can measure up to 100 amps directly through the meter. Tech B says when checking high volts, you need to use a volt clamp so you don't damage the digital volt-ohmmeter (DVOM). Who is correct?
    • A. 

      Tech A

    • B. 

      Tech B

    • C. 

      Both Techs A and B

    • D. 

      Neither Tech A nor B

  • 10. 
    Tech A says most digital volt-ohmmeters (DVOMs) have both auto range and a manual range setting. Tech B says OL means overload and indicates the voltage being read is higher than the maximum. Who is correct?
    • A. 

      Tech A

    • B. 

      Tech B

    • C. 

      Both Techs A and B

    • D. 

      Neither Tech A nor B

  • 11. 
    When doing a voltage drop test, the reading is 2.7 volts across the circuit. How many volts are going to the load?
    • A. 

      12 volts

    • B. 

      9.3 volts

    • C. 

      8.3 volts

    • D. 

      3.7 volts

  • 12. 
    Tech A says testing across the battery will show you better voltage. Tech B says when checking across a switch, it has a 2-volt drop, which means only about 10 volts are going to the light. Who is correct?
    • A. 

      Tech A

    • B. 

      Tech B

    • C. 

      Both Techs A and B

    • D. 

      Neither Tech A nor B

  • 13. 
    Tech A says when doing a voltage drop test, the voltmeter needs to be set to ohm. Tech B says current has to be flowing to do a voltage drop test. Who is correct?
    • A. 

      Tech A

    • B. 

      Tech B

    • C. 

      Both Techs A and B

    • D. 

      Neither Tech A nor B

  • 14. 
    Tech A says that in a relay, current is sent through a resistor and a magnetic field is produced. Tech B says to check the amps in a circuit, you need to connect the leads parallel to the circuit. Who is correct?
    • A. 

      Tech A

    • B. 

      Tech B

    • C. 

      Both Techs A and B

    • D. 

      Neither Tech A nor B

  • 15. 
    Tech A says when checking resistance in a circuit, you need to have power connected to the component. Tech B says ideally, you should have a component disconnected. Who is correct?
    • A. 

      Tech A

    • B. 

      Tech B

    • C. 

      Both Techs A and B

    • D. 

      Neither Tech A nor B

  • 16. 
    Tech A says Ohm's law will show how many amps are needed in a circuit with 110 ohm resistor and a 12-volt power supply. The amps needed are:
    • A. 

      12 amps.

    • B. 

      1.2 amps.

    • C. 

      0.12 amps.

    • D. 

      0.012 amps.

  • 17. 
    Tech A says there are three ways to check a circuit with Ohm's law. Tech B says if you know two of the measurements, Ohm's law will show you the third. Who is correct?
    • A. 

      Tech A

    • B. 

      Tech B

    • C. 

      Both Techs A and B

    • D. 

      Neither Tech A nor B

  • 18. 
    When discussing a circuit, you know the voltage is 0.202 volts and the current draw is 0.00202 amp. What is the resistance in the circuit?
    • A. 

      1

    • B. 

      10

    • C. 

      100

    • D. 

      10000

  • 19. 
    When doing a voltage drop test, you should do all these EXCEPT:
    • A. 

      Select auto range volts DC.

    • B. 

      Connect the red lead to volt/ohm.

    • C. 

      Remove the positive battery cable.

    • D. 

      Ensure the current is flowing.

  • 20. 
    Tech A says you can calculate total circuit current with this formula I = V ÷ R. Tech B says you can determine the total voltage drop using Ohm's law. Who is correct?
    • A. 

      Tech A

    • B. 

      Tech B

    • C. 

      Both Techs A and B

    • D. 

      Neither Tech A nor B

  • 21. 
    Tech A says voltage drops can be measured as long as current is flowing. Tech B says voltage drops can be measured across components, connectors, or cables. Who is correct?
    • A. 

      Tech A

    • B. 

      Tech B

    • C. 

      Both Techs A and B

    • D. 

      Neither Tech A nor B

  • 22. 
    When calculating current flow in a parallel circuit that has 4 resistors, you would:
    • A. 

      Divide the total current flow by the volts.

    • B. 

      Multiply the current flow by 4.

    • C. 

      Add the current flow for each resistor together.

    • D. 

      Subtract the volts from amps and add 2 volts.

  • 23. 
    A variable resistor:
    • A. 

      Has a fixed resistance.

    • B. 

      Changes with the amount of voltage applied.

    • C. 

      Has a movable arm that swipes across a coil that has less resistance at one end and more at the other.

    • D. 

      All of the above

  • 24. 
    Tech A says checking a variable resistor is almost the same as a regular resistor. Tech B says you have to have a different type of digital volt-ohmmeter (DVOM) to read a variable resistor. Who is correct?
    • A. 

      Tech A

    • B. 

      Tech B

    • C. 

      Both Techs A and B

    • D. 

      Neither Tech A nor B

  • 25. 
    Tech A says an oscilloscope is commonly referred to as a lab scope or just scope. Tech B says lab scopes are not very important test instruments in a modern automobile. Who is correct?
    • A. 

      Tech A

    • B. 

      Tech B

    • C. 

      Both Techs A and B

    • D. 

      Neither Tech A nor B