Electrical Unit: Ultimate Practice Exam! Quiz

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  • 1/70 Questions

    Some networks transmit and receive signals over a single wire, but most have dual wires and are commonly called “CAN-bus high (H)” and “CAN-bus low (L),” with the same message sent on both lines.

    • True
    • False
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About This Quiz


Are you preparing for an upcoming electrical unit exam? This quiz can serve as the preparation for the exam. As far as this quiz goes, you will see what the traditional automobile battery type is, which battery has removable cell covers, what a technician must always wear when working with a battery, and standard automotive network configurations. This enthralling quiz will help you study for the exam. Good luck.

Electrical Unit: Ultimate Practice Exam! Quiz - Quiz

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  • 2. 

    Volts, amps, and ohms are the three basic units of electrical measurement.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Voltage, amperage, and resistance are the 3 main electrical measurements.

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  • 3. 

    The _____________ monitors battery voltage and varies current flow through the rotor field circuit.

    • Slip rings

    • Rotor

    • Voltage regulator

    • Armature

    Correct Answer
    A. Voltage regulator
    Explanation
    The voltage regulator monitors voltage and makes adjustments based upon demand and use of the vehicle's electrical system.

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  • 4. 

    In calculating ohm's law:

    • R stands for resistance.

    • A stands for amps.

    • V stands for voltage.

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    All of the above are correct.

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  • 5. 

    What does DVOM stand for?

    • Digital volt–hour meter

    • Digital volt-ohmmeter

    • Digital valve ohmmeter

    • Digital variable oval meter

    Correct Answer
    A. Digital volt-ohmmeter
    Explanation
    A DVOM is a digital volt-ohmmeter and is has that name because of what it tests and how it displays the measurement.

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  • 6. 

    Tech A says you must have power supply for a simple circuit to work. Tech B says a switch will interrupt. Who is correct?

    • Tech A

    • Tech B

    • Both Techs A and B

    • Neither Tech A nor B

    Correct Answer
    A. Both Techs A and B
    Explanation
    The power supply is one of the components of a simple circuit. The switch interrupts the current in a circuit.

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  • 7. 

    You have a 4 ohm resister and the battery is charged to 12 volts. How many amps will flow in the circuit?

    • 1

    • 2

    • 3

    • 4

    Correct Answer
    A. 3
    Explanation
    Solve volts = amps x resistance.

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  • 8. 

    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?

    • 1

    • 10

    • 100

    • 10000

    Correct Answer
    A. 100
    Explanation
    Solve for ohms law. V=IR

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  • 9. 

    The traditional automobile battery type is the:

    • Lead acid.

    • Ion.

    • Helium.

    • Nitrogen.

    Correct Answer
    A. Lead acid.
    Explanation
    Lead plates and acid are the two main parts of a car battery.

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  • 10. 

    A technician must always wear ______________ when working on a battery.

    • Designer clothes

    • Earrings

    • Tennis shoes

    • Safety glasses

    Correct Answer
    A. Safety glasses
    Explanation
    You always wear safety glasses when working in the shop, on anything.

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  • 11. 

    Tech A says a solenoid is not used on modern automobiles. Tech B says fuel injectors and starter motor solenoids are two of many solenoids used on modern automobiles. Who is correct?

    • Tech A

    • Tech B

    • Both Techs A and B

    • Neither Tech A nor B

    Correct Answer
    A. Tech B
    Explanation
    Solenoids are used in many automotive applications, injectors and starter motors are 2 of these uses.

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  • 12. 

    A switch is used to:

    • Protect a circuit.

    • Allow current to flow only one way.

    • Reduce the current flow.

    • Turn current flow on and off.

    Correct Answer
    A. Turn current flow on and off.
    Explanation
    A switch controls the current flow to the resistor.

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  • 13. 

    _____________ is/are fundamental to the automobile.

    • A 12-volt storage battery

    • An engine starting system

    • A charging system

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    Are of the listed are important for a modern automobile.

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  • 14. 

    Which of the following may be required when diagnosing and repairing a vehicle's electronic modules?

    • Software transfers

    • Flash reprogramming

    • Software updates

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    Software updates, transfers, and reprogramming may all need to be performed when diagnosing or replacing a vehicle's control module.

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  • 15. 

    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?

    • Tech A

    • Tech B

    • Both Techs A and B

    • Neither Tech A nor B

    Correct Answer
    A. Both Techs A and B
    Explanation
    Ohm's law is V=IR, no matter how you arrange it. You can use Ohm's law to determine the total drop of voltage.

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  • 16. 

    Controlled area network bus (CAN-bus) systems carry:

    • Children.

    • High-speed data.

    • Very slow data.

    • Info for the cruise control.

    Correct Answer
    A. High-speed data.
    Explanation
    The data in a CAN is at a very high speed with respect to other data transfer in a vehicle.

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  • 17. 

    The following battery has removable cell covers.

    • Sealed

    • Maintenance free

    • Lead acid flooded cell

    • None of the above

    Correct Answer
    A. Lead acid flooded cell
    Explanation
    Only the flooded cell battery has removable covers to check the internal water level.

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  • 18. 

    CAN-bus is a _______-speed network.

    • Medium

    • High

    • Low

    • None of the above

    Correct Answer
    A. High
    Explanation
    Data on a CAN transmits at a high speed.

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  • 19. 

    Tech A says wire size is very important. Tech B says there are two scales used to measure wire size. Who is correct?

    • Tech A

    • Tech B

    • Both Techs A and B

    • Neither Tech A nor B

    Correct Answer
    A. Both Techs A and B
    Explanation
    Wire size is very important. That is why the starter cables are the size they are. There are many gauges of wire size.

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  • 20. 

    When doing a voltage drop test, you should do all these EXCEPT:

    • Select auto range volts DC.

    • Connect the red lead to volt/ohm.

    • Remove the positive battery cable.

    • Ensure the current is flowing.

    Correct Answer
    A. Remove the positive battery cable.
    Explanation
    If you're doing a voltage drop, you need the circuit to be live. Disconnecting the battery cable will open the circuit.

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  • 21. 

    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?

    • Tech A

    • Tech B

    • Both Techs A and B

    • Neither Tech A nor B

    Correct Answer
    A. Tech A
    Explanation
    Yes, the scope is commonly referred to as either of the three listed, and are very important instruments in testing and inspecting faults with modern automobiles.

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  • 22. 

    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?

    • Tech A

    • Tech B

    • Both Techs A and B

    • Neither Tech A nor B

    Correct Answer
    A. Both Techs A and B
    Explanation
    You can check a circuit for resistance, voltage, and current. If you have two of the measurements, you will be solving for a single variable.

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  • 23. 

    Tech A says that batteries should be disposed of in landfills. Tech B says that batteries must be recycled. Who is correct?

    • Tech A

    • Tech B

    • Both Techs A and B

    • Neither Tech A nor B

    Correct Answer
    A. Tech B
    Explanation
    Car batteries have lead and should always be recycled.

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  • 24. 

    Tech A says that the starter converts mechanical energy to electrical energy. Tech B says that the starter converts electrical energy to mechanical energy. Who is correct?

    • Tech A

    • Tech B

    • Both Techs A and B

    • Neither Tech A nor B

    Correct Answer
    A. Tech B
    Explanation
    The starter takes the battery's charge and converts it into movement, or mechanical energy.

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  • 25. 

    When probing wires, you should do all these EXCEPT:

    • Back probe when possible.

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

    • Reinsulate the hole with room temperature vulcanizing silicone.

    • Never use excessive force.

    Correct Answer
    A. Reinsulate the hole with room temperature vulcanizing silicone.
    Explanation
    Never reseal a hole after probing with silicone.

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  • 26. 

    Tech A says an alternator has to have a transformer and a rectifier is used to produce DC volts. Tech B says you can run an AC motor on DC volts. Who is correct?

    • Tech A

    • Tech B

    • Both Techs A and B

    • Neither Tech A nor B

    Correct Answer
    A. Tech A
    Explanation
    Alternators create AC voltage and need to be rectified to DC to be used in automobiles. You can not run an AC motor on DC volts, and vise versa.

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  • 27. 

    Ohm's law tells us that it takes 1 volt to push 1 amp through how many ohms?

    • 1

    • 2

    • 3

    • 4

    Correct Answer
    A. 1
    Explanation
    Solve volts = amps x resistance.

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  • 28. 

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

    • Divide the total current flow by the volts.

    • Multiply the current flow by 4.

    • Add the current flow for each resistor together.

    • Subtract the volts from amps and add 2 volts.

    Correct Answer
    A. Add the current flow for each resistor together.
    Explanation
    The sum of the resistances in a parallel circuit equals the total current flow in the circuit.

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  • 29. 

    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?

    • Tech A

    • Tech B

    • Both Techs A and B

    • Neither Tech A nor B

    Correct Answer
    A. Tech A
    Explanation
    A resistor is a resistor. There are only small differences between them. There is only one kind of DVOM.

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  • 30. 

     The ______________ allows current to flow one way in the rectifier assembly.

    • Diode

    • Thyroid

    • Electromotive force (EMF)

    • Counter-electromotive force (CEMF)

    Correct Answer
    A. Diode
    Explanation
    The diode only allows current to flow one way through the circuit.

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  • 31. 

    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?

    • Tech A

    • Tech B

    • Both Techs A and B

    • Neither Tech A nor B

    Correct Answer
    A. Tech B
    Explanation
    A circuit does not need to be live to test for resistance. Having the component will keep from any feedback testing from happening.

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  • 32. 

    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:

    • 12 amps.

    • 1.2 amps.

    • 0.12 amps.

    • 0.012 amps.

    Correct Answer
    A. 0.12 amps.
    Explanation
    Solve for ohms law. V=IR

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  • 33. 

    Tech A says when you ground a circuit, you hook it back to the positive side of the battery. Tech B says some manufactures use the chassis as a return path to the battery. Who is correct?

    • Tech A

    • Tech B

    • Both Techs A and B

    • Neither Tech A nor B

    Correct Answer
    A. Tech B
    Explanation
    Grounding is the act of completing the circuit to the negative part of the battery. Since the battery ground hooks up to the chassis, it can be used as a universal ground for the vehicle.

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  • 34. 

    Tech A says the CAN-bus system has a data link connector (DLC) that provides a connection into the data network and allows scan tools to connect into the network. Tech B says when there is an issue with the CAN-bus system, a diagnostic trouble code (DTC) with an “N” designation will typically be set, indicating the nature of the fault. Who is correct?

    • Tech A

    • Tech B

    • Both Techs A and B

    • Neither Tech A nor B

    Correct Answer
    A. Tech A
    Explanation
    The DLC is the interface between the vehicle's systems and the scan tool. U is the generic letter designation for communication faults.

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  • 35. 

    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?

    • Tech A

    • Tech B

    • Both Techs A and B

    • Neither Tech A nor B

    Correct Answer
    A. Both Techs A and B
    Explanation
    DVOMs have both a manual and auto setting. OL does mean you are measuring more than the maximum setting set on the meter.

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  • 36. 

    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?

    • Tech A

    • Tech B

    • Both Techs A and B

    • Neither Tech A nor B

    Correct Answer
    A. Both Techs A and B
    Explanation
    You need current flow to measure a drop in voltage, and can be done across any kind of circuit or load.

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  • 37. 

    Electrochemical energy is produced when:

    • The sun shines on photocells.

    • The steam builds.

    • When two dissimilar metals are heated.

    • Two dissimilar metals are immersed in an acidic liquid.

    Correct Answer
    A. Two dissimilar metals are immersed in an acidic liquid.
    Explanation
    The reaction between the acid and the lead is what creates the movement of electrons.

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  • 38. 

    How many paths are there in a series circuit?

    • 1

    • 2

    • 3

    • 4

    Correct Answer
    A. 1
    Explanation
    A series circuit is when the resistances are sequentially in line with each other.

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  • 39. 

    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?

    • Tech A

    • Tech B

    • Both Techs A and B

    • Neither Tech A nor B

    Correct Answer
    A. Both Techs A and B
    Explanation
    A small amount of current is used to energize the windings in a relay. They can either be normally open or closed.

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  • 40. 

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

    • 12 volts

    • 9.3 volts

    • 8.3 volts

    • 3.7 volts

    Correct Answer
    A. 9.3 volts
    Explanation
    The voltage drop test measures the difference in voltage across a circuit. In this case, the reading is 2.7 volts. Since the total voltage in the circuit is 12 volts, subtracting the voltage drop from the total voltage gives us the voltage going to the load. Therefore, the voltage going to the load is 9.3 volts.

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  • 41. 

    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?

    • Tech A

    • Tech B

    • Both Techs A and B

    • Neither Tech A nor B

    Correct Answer
    A. Tech B
    Explanation
    DVOM needs to be set to test volts, and yes, you need a live circuit to test the voltage drop.

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  • 42. 

    The process of converting alternating current (AC) into direct current (DC) is called:

    • Rectification.

    • Electromotive force (EMF).

    • Counter-electromotive force (CEMF).

    • Recertification.

    Correct Answer
    A. Rectification.
    Explanation
    The alternator rectifies the AC voltage into DC voltage.

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  • 43. 

    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?

    • Tech A

    • Tech B

    • Both Techs A and B

    • Neither Tech A nor B

    Correct Answer
    A. Tech A
    Explanation
    A relay has two sides. The control side has a winding that gets charged and closes the switch on the other side of the relay. To read amperage in a circuit, you either need an amp clamp or to hook up the DVOM in series with the circuit.

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  • 44. 

    A variable resistor:

    • Has a fixed resistance.

    • Changes with the amount of voltage applied.

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

    • All of the above

    Correct Answer
    A. Has a movable arm that swipes across a coil that has less resistance at one end and more at the other.
    Explanation
    Think of a fuel level sensor, also known as a sending unit.

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  • 45. 

    Tech A says copper has a low resistance. Tech B says the length of wire doesn't affect resistance. Who is correct?

    • Tech A

    • Tech B

    • Both Techs A and B

    • Neither Tech A nor B

    Correct Answer
    A. Tech A
    Explanation
    Copper has a low resistance. That is why it is used to carry electricity. Both the length and width of a wire will effect the amount of resistance it has.

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  • 46. 

    The nominal voltage of each cell of a battery is _____________ volts.

    • 1.9

    • 2.0

    • 2.1

    • 2.2

    Correct Answer
    A. 2.1
    Explanation
    Each healthy cell in a car's battery should have 2.1 volts. 6 cells multiplied by 2.1 equals 12.6 volts.

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  • 47. 

    Controlled area network bus (CAN-bus) systems should be checked using a(n):

    • Power probe

    • Analog meter

    • Test light

    • Digital multimeter

    Correct Answer
    A. Digital multimeter
    Explanation
    CANs can be checked with either a digital multimeter or an osciliscope.

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  • 48. 

    Tech A says that to do a quick test on an alternator charging system is to remove one of the cables off the battery posts, and if the engine continues to run, then the charging system is good. Tech B says that the practice of removing a battery cable connection can damage the electronics on the vehicle. Who is correct?

    • Tech A

    • Tech B

    • Both Techs A and B

    • Neither Tech A nor B

    Correct Answer
    A. Tech B
    Explanation
    Removing the battery cable from the battery is an antiquated method of testing the charging system. The alternator needs to be taxed and the current observed to truly know if it is faulty.

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  • 49. 

    Tech A says an atom with more electrons than protons has an overall positive charge. Tech B says not all atoms can give up or accept electrons easily. Who is correct?

    • Tech A

    • Tech B

    • Both Techs A and B

    • Neither Tech A nor B

    Correct Answer
    A. Tech B
    Explanation
    The charge of electrons and protons in an atom cancel each other. Some atoms are already "happy", others want to accept electrons, and others what to give up theirs to have 8 valence electrons.

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  • Aug 23, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • Jan 23, 2015
    Quiz Created by
    Atahcpss
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