Electrical Unit: Ultimate Practice Exam! Quiz

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1. 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.

Explanation

There are some situations where there is a single wire, but most networks operate on a two wire system, and the data is transmitted at two different speeds.

Submit
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About This Quiz
Electrical Unit: Ultimate Practice Exam! Quiz - 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... see morewhat 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. see less

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

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.

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:

Explanation

All of the above are correct.

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5. What does DVOM stand for?

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

Explanation

Solve volts = amps x resistance.

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

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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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?

Explanation

Solve for ohms law. V=IR

Submit
9. The traditional automobile battery type is the:

Explanation

Lead plates and acid are the two main parts of a car battery.

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

Explanation

You always wear safety glasses when working in the shop, on anything.

Submit
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?

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:

Explanation

A switch controls the current flow to the resistor.

Submit
13. _____________ is/are fundamental to the automobile.

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?

Explanation

Software updates, transfers, and reprogramming may all need to be performed when diagnosing or replacing a vehicle's control module.

Submit
15. Controlled area network bus (CAN-bus) systems carry:

Explanation

The data in a CAN is at a very high speed with respect to other data transfer in a vehicle.

Submit
16. The following battery has removable cell covers.

Explanation

Only the flooded cell battery has removable covers to check the internal water level.

Submit
17. CAN-bus is a _______-speed network.

Explanation

Data on a CAN transmits at a high speed.

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18. 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?

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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19. 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?

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

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?

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.

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

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

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?

Explanation

The starter takes the battery's charge and converts it into movement, or mechanical energy.

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

Explanation

Solve volts = amps x resistance.

Submit
26. When probing wires, you should do all these EXCEPT:

Explanation

Never reseal a hole after probing with silicone.

Submit
27. 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?

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.

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

Explanation

The diode only allows current to flow one way through the circuit.

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29. 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:

Explanation

Solve for ohms law. V=IR

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

Explanation

The sum of the resistances in a parallel circuit equals the total current flow in the circuit.

Submit
31. 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?

Explanation

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

Submit
32. 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?

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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33. 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?

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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34. How many paths are there in a series circuit?

Explanation

A series circuit is when the resistances are sequentially in line with each other.

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35. 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?

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

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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37. 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?

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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38. 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?

Explanation

You need current flow to measure a drop in voltage, and can be done across any kind of circuit or load.

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

Explanation

The alternator rectifies the AC voltage into DC voltage.

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40. 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?

Explanation

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

Submit
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?

Explanation

DVOM needs to be set to test volts, and yes, you need a live circuit to test the voltage drop.

Submit
42. A variable resistor:

Explanation

Think of a fuel level sensor, also known as a sending unit.

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43. Electrochemical energy is produced when:

Explanation

The reaction between the acid and the lead is what creates the movement of electrons.

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

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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45. 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?

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.

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

Explanation

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

Submit
47. 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?

Explanation

Parallel circuits are when the resistances are side by side, with individual power supplies and grounds. The sum of all of the current draws in a parallel circuit is the total current draw in the circuit.

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

Explanation

CANs can be checked with either a digital multimeter or an osciliscope.

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49. What materials make a good insulator?

Explanation

Ceramics, plastics and rubbers are good insulators. They do not readily accept or give electrons.

Submit
50. Tech A says a resistor is a component designed to extract energy from the current flow. Tech B says he uses a voltmeter to check for a voltage drop. Who is correct?

Explanation

Resistors or loads eat up the energy from the source. A voltmeter is used to measure the drop of voltage through a circuit.

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51. 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?

Explanation

High resistance does not increase current flow. Solve ohms law for constant voltage and infinite resistance. The drop of voltage in a circuit is a measurement of how much resistance there is in the part of the circuit being measured.

Submit
52. 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?

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.

Submit
53. Tech A says that failure of a battery hold down can cause battery plate damage. Tech B says that a bungee cord is a suitable battery hold down. Who is correct?

Explanation

The constant jarring of the battery internals will cause the lead plates to shatter. Anything other than an acceptable battery hold down is insufficient.

Submit
54. The horn switch is usually mounted in the steering wheel and requires a method to maintain an electrical connection to the circuit as the steering wheel rotates. This connection is called a:

Explanation

The clock spring is the part the links the steering wheel electrical functions to the rest of the car.

Submit
55. Tech A says higher-speed networks are used for critical data such as supplemental restraint systems, anti-lock brake systems, and engine controls. Tech B says lower-speed networks are used for lower priority data such as data related to entertainment systems. Who is correct?

Explanation

We want to use a higher speed to transfer the most important data.

Submit
56. 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?

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.

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

Explanation

2168mV = 2.168 volts = 2168millivolts

Submit
58. Tech A says that the horn circuit can fail in many ways. Any of the components in the circuit can go bad, as can the wiring. Tech B says when testing the horn, it may be easiest to first see if power is getting to the horn when it is activated, because it is not uncommon for horns to go bad, especially if they are rarely used or overused. Who is correct?

Explanation

Anything or multiple things can go wring in an electrical circuit. Horns can go bad if rarely used or overused. Testing for power supply and ground at the horn is an easy way to test its health.

Submit
59. Tech A says in a parallel circuit, the more branches that are added, the more current flow increases. Tech B says a series-parallel circuit is made of parallel circuits only. Who is correct?

Explanation

The sum of the currents in a parallel circuit equal the total draw of current. A series-parallel circuit is exactly that, a circuit with resistors in series and parallel.

Submit
60. Tech A says that the alternator converts electrical energy into mechanical energy. Tech B says that the alternator converts mechanical energy into electrical energy. Who is correct?

Explanation

The alternator in a vehicle is responsible for converting mechanical energy, which is generated by the engine, into electrical energy. This electrical energy is used to charge the battery and power the vehicle's electrical systems while the engine is running. Tech B is correct, while Tech A's statement is incorrect because the alternator does not convert electrical energy into mechanical energy.

Submit
61. If only the intermittent speed setting on the windshield wipers is not working, it may be caused by a faulty:

Explanation

The delay module is the only thing listed that will effect the intermittent wiper operation.

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

Explanation

Testing from the battery directly will give you the best amount of voltage. The voltage drop is the difference of voltage in two different places in a circuit. What is left for the load is the drop amount, and its difference with battery voltage.

Submit
63. What are the three types of resistors?

Explanation

Three different types of resistors are listed in option A.

Submit
64. Which of the following is not a diagnostic tool used in the testing of the controlled area network bus (CAN-bus) system?

Explanation

The breakout box, DVOM, and oscilloscope are all options in diagnosing a CAN.

Submit
65. All of the following are common automotive network configurations EXCEPT:

Explanation

CANs can not exist in the shape of a triangle.

Submit
66. On modern vehicles, what replaced the voltage regulator?

Explanation

Control modules are now responsible for monitoring and adjusting current output of an alternator.

Submit
67. Tech A says that the standard 12-volt car battery has 3 cells with 4.2 volts in each cell. Tech B says that the standard 12-volt car battery has 4 cells with 3.3 volts each. Who is correct?

Explanation

The standard car battery has 6 cells with 2.1 volts a piece.

Submit
68. Tech A says fiber optic cables are more expensive and very heavy. Tech B says fiber optics can only carry very little data. Who is correct?

Explanation

Fiber optic cables are made from plastic. They are very light and cheap to make. Pulses of light have the ability to transfer a large amount of data, very quickly, and with very little energy used.

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

Explanation

AC stands for alternating current. DC stands for direct current and is not used in hybrid vehicles to run electric motors.

Submit
70. 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?

Explanation

Most meters can't handle that much current and before measuring current, you should check the DVOM to see what it can handle. Amperage or current is measured with a clamp.

Submit
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Some networks transmit and receive signals over a single wire, but...
Volts, amps, and ohms are the three basic units of electrical...
The _____________ monitors battery voltage and varies current flow...
In calculating ohm's law:
What does DVOM stand for?
You have a 4 ohm resister and the battery is charged to 12 volts. How...
Tech A says you must have power supply for a simple circuit to work....
When discussing a circuit, you know the voltage is 0.202 volts and the...
The traditional automobile battery type is the:
A technician must always wear ______________ when working on a...
Tech A says a solenoid is not used on modern automobiles. Tech B says...
A switch is used to:
_____________ is/are fundamental to the automobile.
Which of the following may be required when diagnosing and repairing a...
Controlled area network bus (CAN-bus) systems carry:
The following battery has removable cell covers.
CAN-bus is a _______-speed network.
Tech A says you can calculate total circuit current with this formula...
Tech A says there are three ways to check a circuit with Ohm's...
When doing a voltage drop test, you should do all these EXCEPT:
Tech A says an oscilloscope is commonly referred to as a lab scope or...
Tech A says wire size is very important. Tech B says there are two...
Tech A says that batteries should be disposed of in landfills. Tech B...
Tech A says that the starter converts mechanical energy to electrical...
Ohm's law tells us that it takes 1 volt to push 1 amp through how...
When probing wires, you should do all these EXCEPT:
Tech A says an alternator has to have a transformer and a rectifier is...
 The ______________ allows current to flow one way in the...
Tech A says Ohm's law will show how many amps are needed in a...
When calculating current flow in a parallel circuit that has 4...
Tech A says checking a variable resistor is almost the same as a...
Tech A says when you ground a circuit, you hook it back to the...
Tech A says most digital volt-ohmmeters (DVOMs) have both auto range...
How many paths are there in a series circuit?
Tech A says relays are turned on and off by a small amount of current....
When doing a voltage drop test, the reading is 2.7 volts across the...
Tech A says when checking resistance in a circuit, you need to have...
Tech A says voltage drops can be measured as long as current is...
The process of converting alternating current (AC) into direct current...
Tech A says the CAN-bus system has a data link connector (DLC) that...
Tech A says when doing a voltage drop test, the voltmeter needs to be...
A variable resistor:
Electrochemical energy is produced when:
Tech A says copper has a low resistance. Tech B says the length of...
Tech A says that in a relay, current is sent through a resistor and a...
The nominal voltage of each cell of a battery is _____________ volts.
Tech A says parallel circuits are like links in a chain. Tech B says...
Controlled area network bus (CAN-bus) systems should be checked using...
What materials make a good insulator?
Tech A says a resistor is a component designed to extract energy from...
Tech A says high resistance causes an increase in current flow. Tech B...
Tech A says that to do a quick test on an alternator charging system...
Tech A says that failure of a battery hold down can cause battery...
The horn switch is usually mounted in the steering wheel and requires...
Tech A says higher-speed networks are used for critical data such as...
Tech A says an atom with more electrons than protons has an overall...
When reading a digital volt-ohmmeter (DVOM), you have a reading of...
Tech A says that the horn circuit can fail in many ways. Any of the...
Tech A says in a parallel circuit, the more branches that are added,...
Tech A says that the alternator converts electrical energy into...
If only the intermittent speed setting on the windshield wipers is not...
Tech A says testing across the battery will show you better voltage....
What are the three types of resistors?
Which of the following is not a diagnostic tool used in the testing of...
All of the following are common automotive network configurations...
On modern vehicles, what replaced the voltage regulator?
Tech A says that the standard 12-volt car battery has 3 cells with 4.2...
Tech A says fiber optic cables are more expensive and very heavy. Tech...
Tech A says AC stands for alternating voltage. Tech B says DC is used...
Tech A says you can measure up to 100 amps directly through the meter....
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