final elec 1

What does excessive current flow in a circuit cause?

An open circuit protection device

The trigger selection tells the lab scope when to begin to display a waveform.

True

Technician A says an open circuit has no breaks in the path and current will flow. Technician B says in a closed circuit the circuit path is broken. Who is correct?

Neither Technician A nor B

How are fuses rated?

By current capacity.

A(n) ____ is a device that uses low current to control a high-current circuit.

relay

Switches are the least common means of providing control of electrical current flow to an accessory.

False

Some automotive electrical systems use a capacitor or condenser to ____ electrical charges.

store

A potentiometer is a three-wire ____ that acts as a voltage divider to produce a continuously variable output signal proportional to a mechanical position.

variable resistor

If a diode is ____, there will be current flow.

forward-biased

A ____ is a conductor with a special heat-resistant insulation.

fusible link

Technician A says a fuse will automatically reset after the cause of the overload is repaired. Technician B says when an overload occurs, the protection device creates an open. Who is correct?

Technician B only

What device or devices use a low current input to control a high current output?

Relays and Transistors

Technician A says a Zener diode is an excellent component for regulating voltage. Technician B says when a circuit is opened suddenly to a large load, such as a coil, installing a clamping diode provides a bypass for the electrons. Who is correct?

Both Technician A and B

Whenever the brake pedal is pressed the left-rear and right-rear taillights, and the left rear and the right-rear brake light of a vehicle illuminate dimly. Technician A says the brake lights may have a poor ground connection. Technician B says the brake light switch may have excessive resistance. Who is correct?

Technician A only

To use a transistor as a simple solid-state relay, what conditions must occur?

The emitter-base junction must be forward biased, and the collector-base junction must be reverse biased.

Direction of current flow through a diode can be identified by a band around the cathode end.

True

Which of the following is true about a clamping diode?

 

It is used to protect some solid-state circuitry.

Which of the following is NOT true of forward-bias in a diode?

Negatively charged holes left behind in the N-material attract electrons from the negative voltage source.

A diode that allows current flow in both directions is ____.

shorted

A ____ is a special type of configuration usually consisting of two transistors fabricated on the same chip or mounted in the same package.

Darlington pair

Technician A says both an ohmmeter and a self-powered test light may be used to test for continuity. Technician B says both may be used to test fuses. Who is correct?

Both Technician A and B

The frame of the vehicle is normally attached to the negative battery post.

True

What will a Zener diode do at breakdown voltage?

Allow reverse current to flow

An inoperative horn is being tested. A DVOM placed across the relay load contact terminals indicates battery voltage when the horn button is pushed. A “click” is heard from the relay when the button is pushed. Technician A says the relay is bad. Technician B says the relay coil circuit is bad. Who is correct?

Technician A only

Two identical lamps are connected in parallel to a 12-volt source. The voltage across each lamp is:

12 volts.

Technician A says voltage will not exist between any two points in a circuit if the potential is zero. Technician B says corrosion is NOT a contributing factor to voltage drop. Who is correct?

Technician A only

Technician A says amperage is the same at any point in a series circuit. Technician B says the total resistance is the sum of all resistance in a series circuit. Who is correct?

Both Technician A and B

Resistance is measured in what unit?

Ohms

Photovoltaics (PV) is one of the forces that can be used to generate electrical current by converting solar ____ through the use of solar cells.

photons

The voltage drop of a Silicon Diode that is forward biased is:

1.0 - 1.8 volts.

Define Ohm’s law.

The relationship between current, voltage, and resistance 

E=IXR 

It takes 1 volt to push 1 amp across 1 ohm

Technician A says when a magnetic field is moved across a conductor, voltage will be induced in the conductor. Technician B says when a conductor is moved across a magnetic field, voltage will be induced in the conductor. Who is correct?

Both Technician A and B

Three 10-ohm resistors are wired in parallel. What is the total resistance?

3.3 ohms

The total amperage in a parallel circuit will be the sum of the individual branch circuits.

True

What does the sum of the voltage drops in a series circuit equal?

The source voltage

Several lamps are connected in parallel to a voltage source. If one light burns out, all the other lamps:

will not be affected.

Current is defined as?

The flow of electrons through a conductor in the presence of voltage

All of the following statements about voltage drops are true except:

Corrosion is not a contributor to voltage drop.

The frame of the vehicle is normally attached to the positive battery post.

False

Technician "A" says a diode is used to control the direction of current flow. Technician "B" says diodes cannot be used to control voltage spike across an inductor. Who is correct?

Technician A.

A taillight bulb is glowing dimly. A voltmeter placed across the bulb reads 4 volts. Technician A says there may be excessive resistance in the ground circuit. Technician B says there may be excessive resistance in the power feed circuit. Who is correct?

Both Technician A and B

The three leads of a bipolar transistor are:

the base, the collector, and the emitter.

Technician A says an atom that loses or gains one electron is balanced. Technician B says an atom that loses or gains one electron is called a charged particle or ion. Who is correct?

Technician B only

The total resistance of all the parallel loads is always more than the smallest individual resistance.

False

In a parallel circuit, there is more than one path for electricity to follow.

True

What is voltage drop?

Voltage used up when pushing current through a resistance

Thermistors are used to provide information on:

temperature

Technician A says circuit protection devices are sensitive to current. Technician B says they are sensitive only to voltage. Who is correct?

 

Technician A only.

echnician A say the diode shown in the schematic circuit below is reverse-bias. Technician B says that, in this circuit, the light would be OFF. Who is correct?

Neither Technicians A nor B.

In most color codes, the first group of letters designates the __________ __________ of the insulation. The second group of letters indicates the color of the __________.

base color, tracer

Which of the following is NOT part of the troubleshooting process?

Replace the component identified by the DTC.

Once it is determined that the battery is operating correctly, the ____ should always be the starting point in troubleshooting an electrical system.

schematic

Where is the best place to find the location of a blower relay?

Component locator

____ wire means the conductor is made of several individual wires that are wrapped together.

Stranded

The AWG standard assigns a(n) ____ number to the wire based on the diameter of the conductor not including the insulation.

gauge

Most wiring diagrams do not show an actual drawing of the components. Rather, they use ____to represent the components.

 

electrical symbols

 ____ wiring is the term used for conductors used for low voltage circuits.

Primary

Ground straps are used to: 

Provide a return path to the battery between insulated components.

Suppress electromagnetic induction.

A switch is drawn on a wiring diagram with "NC" printed beside it. What does this indicate?

The switch will be normally closed with the vehicle running.

Most of the wires in an automobile are covered with ____ insulation to identify wires and electrical circuits.

colored

Technician A says that wiring harnesses pass from the passenger compartment to the engine compartment through bulkhead connectors. Technician B says a wire harness is a group of wires that branches out to various electrical components. Who is correct?

 

Both Technician A and B

If the connector is a one-piece, molded-type connector, it cannot be ____ for repairs.

disassembled

Technician A says the VIN number will help to determine the correct wiring diagram to use for diagnosis. Technician B says each automobile model may have a different wiring diagram. Who is correct?

 

Both Technician A and B

__________ __________ __________ are used to prevent damage to the wiring by maintaining proper wire routing and retention.

 

Wiring protective devices

In a wire, an increase in temperature creates a similar __________ in resistance.

increase

What does a dotted line between connectors indicate?

The connectors are physically the same.

Most ____ use printed circuit boards as circuit conductors.

instrument panels

Splicing aluminum wire is being discussed. Technician A says to solder the wires by coating them with petroleum jelly to control the temperature of the soldering iron. Technician B says to cover the splice with electrical tape. Who is correct?

Neither Technician A nor B

Technician A says a wiring diagram is an excellent tool in locating circuit failures. Technician B says in most cases a wiring diagram is not necessary to locate circuit failures. Who is correct?

Technician A only

Technician A says two connectors with the same number are physically the same connector. Technician B says the two connectors are drawn apart so the drawing is easier to read. Who is correct?

Both Technician A and B

Acid core solder should be used when making wiring repairs.

False

Two technicians are discussing shielded wire repair. Technician A says the shielded wire must kept separate from the circuit wire. Technician B says there is no difference between repairing a shielded or non-shielded wire. Who is correct?

Technician A only

Technician A says it may be necessary to route a new wire to bypass a damaged conductor. Technician B says to install a grommet anytime a wire passes through the body. Who is correct?

Both Technician A and B

Technician A says a wiring diagram indicates where circuits receive their voltage source and the color of the wires used in the circuit. Technician B says a wiring diagram indicates what circuits are interconnected. Who is correct?

Both Technician A and B

______________________________ complete the return path to the battery between components that are insulated.

Grounds

____ between the powertrain components and the vehicle’s chassis are used to complete the return path to the battery.

 

Ground straps

There is __________ resistance in the stranded wire than in the solid wire.

less

Soldering is the preferred method of copper wire.

True

Technician A says that wiring harness that run close to exhaust manifolds must be housed in PCV conduit. Technician B says printed circuits cannot be repaired. Who is correct?

Neither Technician A nor B

____ is a term used to mean joining of single wire ends or the joining of two or more electrical conductors at a single point.

Splice

An electrical wiring diagram gives the exact location of electrical components on the vehicle.

False

Technician A says wiring diagrams give specific circuit information and detail. Technician B says a wiring diagram will help you find the fault. Who is correct?

Both Technician A and B

A resistor drawn with an arrow through it is the symbol for a variable resistor.

True

What is the formula for Ohm’s Law (in which E = volts, I = amperes, and R = resistance)?

 

E = I × R

The greatest advantage of a digital storage oscilloscope (DSO) is the ____ at which it samples electrical signals.

speed

Technician A says an open circuit has no breaks in the path and current will flow. Technician B says in a closed circuit the circuit path is broken. Who is correct?

Neither Technician A nor B

The display of a DVOM is indicating 236 mV. Which of the following is the same as this value?

 

0.236 volts

Technician A says a voltmeter measures the electrical difference between two points of the circuit. Technician B says a voltmeter that is connected in parallel to the load device will indicate the voltage drop across the device. Who is correct?

Both Technician A and B

A ____ is used when the technician needs to look for electrical power in the circuit.

 

test light

Technician A says testing with a voltmeter can determine the voltage drop across the headlights. Technician B says a voltmeter can determine if excessive resistance is in the circuit. Who is correct?

Both Technician A and B

Because a semiconductor material can operate as both a conductor and an insulator, it is very useful as a ____ device.

switching

A potentiometer is a three-wire ____ that acts as a voltage divider to produce a continuously variable output signal proportional to a mechanical position.

variable resistor

Which of the following is NOT true of forward-bias in a diode?

While using a test light to check for voltage, the lamp illuminates bright. Technician A says this indicates that the circuit can handle the load that is required by the test light. Technician B says the amperage to turn on the  light is dependent on the type and rating of the bulb. Who is correct?

Both Technician A and B

Technician A says the total amperage in a parallel circuit is equal to the sum of the individual branch circuits. Technician B says the amperage in a series circuit is the same anywhere in the circuit. Who is correct?

Both Technician A and B

 ____ is the electrical pressure that causes electrons to move provided there is a complete path for them to do so.

Voltage

The starter drive is the part of the starter motor that engages the armature to the engine____.

flywheel ring gear

Common types of AC motors are the ____ motor and the induction motor.

synchronous