AFD 115 exam
A 200 amp circuit that is 25 feet long should use wire of which AWG rating? A) 2 ga. B) 16 ga. C) 14 ga. D) 18 ga.
2 ga.
It requires ________ volt(s) to push 1 ampere through 1 ohm of resistance. Question options: 1 2 12 None of these
A) 1
If a 12-volt battery is connected to a series circuit with three resistors of 2 ohms, 4 ohms, and 6 ohms, how much current will flow through the circuit? Question options: 1 amp 2 amp 3 amp 4 amp
A) 1 amp
How many watts are consumed by a light bulb if 1.2 amperes are measured when 12 volts are applied? Question options: 14.4 watts 144 watts 10 watts 0.10 watt
A) 14.4 watts
How much current will flow in this circuit? battery 12 volts bulb 1 (1 ohms) Bulb 2 (2 ohms) Bulb 3 (3 ohms) A) 2 amps B) 12 amps C) 3 amps D) None of these
A) 2 amps
Normal battery drain (parasitic drain) for a vehicle with computer and electronic circuits is ________. Question 82 options: 20 to 30 milliampere 2 to 3 amperes 150 to 300 milliamperes None of the above
A) 20 to 30 milliampere
If 200 amperes flow from the positive terminal of a battery and operate the starter motor, how many amperes will flow back to the negative terminal of the battery? Question options: 200 amperes Zero About one-half (100 amperes) Cannot be determined
A) 200 amperes
An electrical circuit uses 12 volts and has a current flow of 2 amps. What is the wattage? Question options: 24 watts 6 watts 12 watts None of these
A) 24 watts
What is the total current flow in this parallel circuit? Question options: 3.7 A 0.4 A 2.5 A Not enough information
A) 3.7 A
What is the total resistance of this parallel circuit? 12 volts, 12 ohms, 12 ohms, 12 ohms Question options: 4 ohms 36 ohms 3 ohms Not enough information
A) 4 ohms
What is the total resistance in this circuit? battery 12 volts bulb 1 (1 ohms) Bulb 2 (2 ohms) Bulb 3 (3 ohms) Question options: 6 ohms 12 ohms 3 ohms None of these
A) 6 ohms
During load testing, battery voltage should not drop below ________. Question 86 options: 9.6 7.5 8.6 10.5
A) 9.6
If two insulated wires were to melt together where the copper conductors touched each other, the type of failure would be called ________. Question options: A short to voltage A short to ground An open A floating ground
A) A short to voltage
Calculate the current flow in this circuit. (Round off to 2 decimal points.) Question options: About 0.95 amps About 0.33 amps About 3 amps
A) About .95 amps
Magnetic field strength is measured in ________. Question options: Ampere-turns Flux Density Coil strength
A) Ampere-turns
Where is the force of magnetic lines strongest in a bar magnet? Question options: At each end In the middle of the magnet Only at the north pole of the magnet None of these
A) At each end
Which one of the bulbs in this circuit will drop (use up) the most voltage? Question options: Bulb 3 Bulb 2 Bulb 1 They will all drop the same amount of voltage
A) Bulb 3
This schematic shows ________. Question options: Capacitors in parallel Capacitors in series Batteries in parallel A diode trio
A) Capacitors in parallel
Most carbon resistors indicate their electrical resistance by ________. Question options: Color coded markings Shape Printed numbers indicating resistance in ohms None of these
A) Color coded markings
A complete circuit that is continuous from source through loads and back to ground has ________. Question options: Continuity Congruency Both A and B Neither A nor B
A) Continuity
As additional branches are added to a parallel circuit, total circuit resistance ________. Question options: Decreases Increases Remains the same None of these
A) Decreases
In a circuit with high resistance ________. Question options: Electrical loads may still operate but less efficiently No electrical device will function Both A and B Neither A nor B
A) Electrical loads may still operate but less efficiently
The automotive battery is based on the principle of ________. Question options: Electrochemistry Photoelectricity Piezoelectric energy None of these
A) Electrochemistry
The sum of currents in each branch of a parallel circuit will ________ total circuit current. Question options: Equal Be more than Be less than None of these
A) Equal
The voltage drop for each branch of a parallel circuit is ________. Question options: Equal Reduced by the resistance of loads in each branch Increased by the resistance of loads in each branch None of these
A) Equal
The current flowing into each junction of a parallel circuit ________ the current flow at the junction on the opposite end of that branch. Question options: Equals Is less than Is more than None of these
A) Equals
Semiconductors have how many electrons in their valence rings? Question options: Four Less than four More than four None of these
A) Four
A magnetic field can be measured using a ________. Question options: Gauss gauge Voltmeter Inductive pickup None of these
A) Gauss gauge
Ammeters should be connected ________ with the circuit being tested. Question 56 options: In series In parallel Across a load None of these
A) In series
As additional branches are added to a parallel circuit, total circuit amperage ________. Question options: Increases Decreases Remains the same None of these
A) Increases
If the voltage increases in a circuit, what happens to the current (amperes) if the resistance stays the same? Question options: Increases Decreases Remains the same Cannot be determined
A) Increases
What type of material is indicated by this atomic structure? Question options: Insulator Conductor Semi-conductor Coaxial
A) Insulator
The total circuit resistance of a parallel circuit is always ________ the lowest resistance present in any branch of the circuit. Question options: Less than More than Equal to None of these
A) Less than
Corrosion on electrical terminals may cause ________. Question options: Lights to be dimmer than normal Increased current flow in the circuit Both A and B Neither A nor B
A) Light to be dimmer than normal
More electrical current will tend to flow through the branch of a parallel circuit with ________ resistance. Question options: Lowest Highest Infinite None of these
A) Lowest
Which term describes current flow produced in a complete circuit when a magnetic field is moved back and forth across the circuit path? Question options: Magnetic induction Electromagnetic reluctance Magnetic potential None of these
A) Magnetic induction
If resistance is reduced in a series circuit, ________ current will flow. Question options: More Less The same None of these
A) More
In a series circuit with more than one load, the highest resistance will drop ________ voltage than any smaller resistance. Question options: More Less The same amount of None of these
A) More
Electrical power is calculated by ________. Question options: Multiplying volts by current Dividing voltage by current Multiplying volts by ohms None of these
A) Multiplying volts by current
In an open circuit ________. Question options: No current will flow No voltage is present Both A and B Neither A nor B
A) No current will flow
Which event causes the capacitor to retain a voltage potential? Question options: Open circuit Closed circuit Both A and B Neither A nor B
A) Open circuit
Which term describes electrical current resulting from pressure applied to certain crystals? Question options: Piezoelectricity Photoelectricity Thermodynamics None of these
A) Piezoelectricity
High resistance in a circuit ________. Question options: Reduces current flow through the circuit May cause a fuse to blow Both A and B Neither A nor B
A) Reduces current flow through the circuit
Voltage supplied to a potentiometer may be called ________. Question options: Reference voltage Primary voltage Leading voltage None of these
A) Reference voltage
Which variable resistor is most likely used for a dash light dimmer control? Question options: Rheostat Potentiometer Piezoelectric None of these
A) Rheostat
A sheet metal screw holding a metal body panel has pierced the insulation of a wire and is touching the copper wire. This would cause a ________. Question options: Short to ground Short to power High resistance None of these
A) Short to ground
Which of these elements has the least resistance? Question options: Silver Gold Copper None of these
A) Silver
Which of these uses a movable core to act as an electric switch? Question options: Solenoid Relay Transistor None of these
A) Solenoid
In a series circuit, total circuit resistance is equal to the ________ of the resistance of all loads in the circuit. Question options: Sum Difference Dividend None of these
A) Sum
A battery high rate discharge (load capacity) test is being performed on a 12 volt battery. Technician A says that a good battery should have a voltage reading of higher than 9.6 volts while under load at the end of the 15-second test. Technician B says that the battery should be discharged (loaded) to twice its CCA rating. Who is right? Question 80 options: Technician A only Technician B only Both technicians A and B Neither technician A nor B
A) Technician A only
A series circuit has three resistors of 4 ohms each. The voltage drop across each resistor is 4 volts. Technician A says that the source voltage is 12 volts. Technician B says that the total resistance is 18 ohms. Which technician is correct? Question options: Technician A only Technician B only Both technicians A and B Neither technician A nor B
A) Technician A only
A series circuit has two 10-ohm bulbs. A third 10-ohm bulb is added in series. Technician A says that the three bulbs will be dimmer than when only two bulbs were in the circuit. Technician B says that the current in the circuit will increase. Which technician is correct? Question options: Technician A only Technician B only Both technicians A and B Neither technician A nor B
A) Technician A only
Technician A says that battery load test loads the battery to one-half of its CCA rating. Technician B says that a good battery should be able to maintain higher than 9.6 volts for a 25 second test period. Who is right? Question 85 options: Technician A only Technician B only Both technicians A and B Neither technician A nor B
A) Technician A only
Technician A says that distilled or clean drinking water should be added to a battery when the electrolyte level is low. Technician B says that fresh electrolyte (solution of acid and water) should be added. Which technician is correct? Question 76 options: Technician A only Technician B only Both technicians A and B Neither technician A nor B
A) Technician A only
Technician A says that magnetism can cause electric current to flow in a conductor. Technician B says that magnetic lines of flux can never penetrate rubber insulation on a conductor. Who is right? Question options: Technician A only Technician B only Both technicians A and B Neither technician A nor B
A) Technician A only
Technician A says that magnets are used in some crankshaft position sensors. Technician B says magnets are used in potentiometers. Which technician is correct? Question options: Technician A only Technician B only Both technicians A and B Neither technician A nor B
A) Technician A only
Technician A says that objects with high permeability allow magnetic lines of flux to flow easily through their material. Technician B says that some objects are good insulators that will not allow magnetic lines of flux to flow through their material. Which technician is correct? Question options: Technician A only Technician B only Both technicians A and B Neither technician A nor B
A) Technician A only
Vehicles equipped with diesel engines may have two batteries connected in parallel in order to provide additional current at the same voltage. Technician A says to successfully test the batteries, they should be disconnected and tested separately. Technician B says that a fault in one battery has NO effect on the other battery. Who is right? Question 87 options: Technician A only Technician B only Both technicians A and B Neither technician A nor B
A) Technician A only
The amperage in a series circuit is ________. Question options: The same anywhere in the circuit Varies in the circuit due to the different resistances High at the beginning of the circuit and decreases as the current flows through the resistance Always less returning than leaving the battery
A) The same anywhere in the circuit
Which device produces electrical current resulting from the heating of two dissimilar conductors? Question options: Thermocouple Volt meter Ammeter None of these
A) Thermocouple
A potentiometer usually has how many wires? Question options: Three Two Four None of these
A) Three
All batteries should be in a secure bracket that is bolted to the vehicle to prevent physical damage to the battery. Question 77 options:1) True2) False
A) True
If one branch of a parallel circuit loses continuity, the other branches will still each receive source voltage and ground. Question options:1) True2) False
A) True
It is relatively easy to move an electron from the valence ring of a conductor. Question options:1) True2) False
A) True
Many GM vehicles use a group 78 size battery. A) True B) False
A) True
A rheostat usually has how many wires? Question options: Two Three Four None of these
A) Two
The outer electron shell is known as a(n) ________. Question options: Valence ring Distant ring Unstable shell None of these
A) Valence ring
Electromotive force is another term for ________. Question options: Voltage Current Resistance None of these
A) Voltage
Kirchhoff's law states that the voltage around a closed circuit is equal to the sum of ________ across all the loads. Question options: Voltage drops Resistances Both A and B Neither A nor B
A) Voltage drops
Which of these is also known as electrical potential? Question options: Volts Amps Ohms None of these
A) Volts
Which of these is the term used for electrical power? Question options: Watts Volts Amps None of these
A) Watts
This diagram indicates current flow using which theory of current flow? Question options: Conventional Theory Electron Theory Watts Theory Battery Theory
A) conventional theory
What is the voltage of this battery pair when measured at the + and - cables? Question 88 options: 24 volts 12 volts 1000 volts 500 volts
B) 12 volts
If an insulated wire rubbed through a part of the insulation and the wire conductor touched the steel body of a vehicle, the type of failure would be called ________. Question options: A short to voltage A short to ground An open A chassis ground
B) A short to ground
Unlike magnetic poles ________ and like magnetic poles ________. Question options: Repel/ attract Attract/ repel Repel/ repel Attract/ attract
B) Attract/ repel
A charged capacitor acts like a ________. Question options: Switch Battery Resistor Coil
B) Battery
Excessive corrosion on an electrical connector ________. Question options: Can cause a fuse to blow Can cause lights to be dim Both A and B Neither A nor B
B) Can cause lights to be dim
What is the symbol for voltage used in calculations? Question options: R E EMF I
B) E
An open electrical circuit has zero ohms resistance. Question options:1) True2) False
B) False
Insulators lose electrons in their outer shell easier than conductors. Question options:1) True2) False
B) False
Magnetic lines of flux flow very easily through objects with high reluctance. Question options:1) True2) False
B) False
A voltmeter should be connected to the circuit being tested ________. Question 55 options: In series In parallel Only when no power is flowing Both A and C
B) In parallel
An open circuit ________. Question options: May be caused by high resistance May be caused by a blown fuse Both A and B Neither A nor B
B) May be caused by a blown fuse
A capacitor used for spike protection will normally be placed in ________ to the load or circuit. Question options: Series Parallel Either series or parallel Parallel with a resistor in series
B) Parallel
A vehicle has four parking lights all connected in parallel and one of the bulbs burns out. Technician A says that this could cause the parking light fuse to blow (open). Technician B says that it would decrease the current in the circuit. Which technician is correct? Question options: Technician A only Technician B only Both technicians A and B Neither technician A nor B
B) Technician B only
Technician A says that resistance increases as the diameter of a conductor increases. Technician B says that resistance increases as the temperature of a conductor increases. Which technician is correct? Question options: Technician A only Technician B only Both technicians A and B Neither technician A nor B
B) Technician B only
The conventional theory for current flow is being used to determine the direction of magnetic lines of force. Technician A says that the left-hand rule should be used. Technician B says that the right-hand rule should be used. Which technician is correct? Question options: Technician A only Technician B only Both technicians A and B Neither technician A nor B
B) Technician B only
Two bulbs are connected in parallel to a 12-volt battery. One bulb has a resistance of 6 ohms and the other bulb has a resistance of 2 ohms. Technician A says that only the 2-ohm bulb will light because all of the current will flow through the path with the least resistance and no current will flow through the 6-ohm bulb. Technician B says that the 6-ohm bulb will be dimmer than the 2-ohm bulb. Which technician is correct? Question options: Technician A only Technician B only Both technicians A and B Neither technician A nor B
B) Technician B only
Two technicians are discussing the operation of a capacitor. Technician A says that a capacitor can create electricity. Technician B says that a capacitor can store electricity. Which technician is correct? Question options: Technician A only Technician B only Both technicians A and B Neither technician A nor B
B) Technician B only
When jump starting ________. Question 83 options: The last connection should be the positive post of the dead battery The last connection should be the engine block of dead vehicle The alternator must be disconnected on both vehicles Both A and C
B) the last connection should be the engine block of dead vehicle
When measuring the specific gravity of the electrolyte, the maximum allowable difference between the highest and lowest hydrometer reading is ________. Question 79 options: 0.010 0.020 0.050 0.50
C) 0.050
How many watts are consumed by a starter motor if it draws 150 amperes at 10 volts? Question options: 15 150 1500 15000
C) 1500
If 12 volts are being applied to a resistance of 3 ohms, ________ amperes will flow. Question options: 12 3 4 36
C) 4
Inductive ammeters work because of what principle? Question 54 options: Magic Electrostatic electricity A magnetic field surrounds any wire carrying a current A voltage drop as it flows through a conductor
C) A magnetic field surrounds any wire carrying a current
A circuit with a short to voltage may cause ________. Question options: Other circuits to malfunction Improper operation of loads in the circuit Both A and B Neither A nor B
C) Both A and B
A circuit with excessive current flow ________. Question options: May create excess heat in conductors May cause a fuse to blow Both A and B Neither A nor B
C) Both A and B
A loose ground connection ________. Question options: Causes reduced current flow Causes less power to be available to the electrical components Both A and B Neither A nor B
C) Both A and B
Electrical controls such as switches ________. Question options: Control electrical flow in the circuit May be on either the source or ground side of the circuit Both A and B Neither A nor B
C) Both A and B
In a circuit with a short to ground ________. Question options: No current flows past the point of the short Some or all of the electrical loads may no longer work Both A and B Neither A nor B
C) Both A and B
In a parallel circuit ________. Question options: There is more than one path for current flow Current flow through each branch of the circuit depends on the resistance present in that branch Both A and B Neither A nor B
C) Both A and B
In a series circuit ________. Question options: Total circuit resistance is equal to the sum of all resistances in the circuit Current flow is constant at any point in the circuit Both A and B Neither A nor B
C) Both A and B
The electrical path to ground may be completed by ________. Question options: The vehicle frame The metal body of the vehicle Both A and B Neither A nor B
C) Both A and B
To prevent blowing the meter fuse in a DMM ________. Question 57 options: Install a fuse in line with the meter lead Never test resistance of an energized circuit Both A and B Neither A nor B
C) Both A and B
Voltage drop is a better measurement of resistance than testing static resistance because ________. Question options: Current flow creates heat which adds to circuit resistance The resistance specification for the component is not required for diagnosis Both A and B Neither A nor B
C) Both A and B
Technician A says that the sum of the voltage drops in a series circuit should equal the source voltage.Technician B says the current (amperes) varies depending on the value of the resistance in a series circuit. Which technician is correct? Question options: Technician A only Technician B only Both technicians A and B Neither technician A nor B
C) Both technician A and B
Technician A says that Ohm's law can be used to determine circuit current flow if total circuit resistance and total voltage are known. Technician B says that Ohm's law can be used to calculate the unknown resistance of a load in a circuit if total current and source voltage are known. Which technician is correct? Question options: Technician A only Technician B only Both technicians A and B Neither technician A nor B
C) Both technicians A and B
Technician A says that a relay is an electromagnetic switch. Technician B says that a solenoid uses a movable core. Which technician is correct? Question options: Technician A only Technician B only Both technicians A and B Neither technician A nor B
C) Both technicians A and B
Technician A says that all battery connections should be inspected for corrosion. Technician B says that battery cables should be checked for corrosion and replaced as needed. Who is right? Question 84 options: Technician A only Technician B only Both technicians A and B Neither technician A nor B
C) Both technicians A and B
Technician A says that electronic calculators have a memory function that can be used to calculate resistance, current, and voltage values for a parallel circuit. Technician B says to separate components of aseries-parallel circuit to simplify calculations. Which technician is correct? Question options: Technician A only Technician B only Both technicians A and B Neither technician A nor B
C) Both technicians A and B
Technician A says that magnetic lines of force can be seen by placing iron filings on a piece of paper and then holding them over a magnet. Technician B says that the effects of magnetic lines of force can be seen using a compass. Which technician is correct? Question options: Technician A only Technician B only Both technicians A and B Neither technician A nor B
C) Both technicians A and B
Two technicians are discussing electromagnetic induction. Technician A says that the induced voltage can be increased if the speed is increased between the conductor and the magnetic lines of force. Technician B says that the induced voltage can be increased by increasing the strength of the magnetic field. Which technician is correct? Question options: Technician A only Technician B only Both technicians A and B Neither technician A nor B
C) Both technicians A and B
Two technicians are discussing ignition coils. Technician A says that some ignition coils have the primary and secondary windings electrically connected. Technician B says that some coils have totally separate primary and secondary windings that are not electrically connected. Which technician is correct? Question options: Technician A only Technician B only Both technicians A and B Neither technician A nor B
C) Both technicians A and B
When discussing induced voltage caused by a magnetic field moving across a complete circuit, technician A says that the direction of current flow depends on the direction of movement of flux lines. Technician B says that the direction of current flow is called polarity. Which technician is correct? Question options: Technician A only Technician B only Both technicians A and B Neither technician A nor B
C) Both technicians A and B
Which component in this electrical circuit is considered the "load"? Question options: A B C D
C) C
Capacitors block the flow of ________ current but allow ________ current to pass. Question options: Strong; weak AC; DC DC; AC Weak; strong
C) DC; AC
The unit of measurement for capacitor rating is the ________. Question options: Ohm Volt Farad Ampere
C) Farad
Which circuit failure is most likely to cause a fuse to blow? Question options: Open Short to voltage Short to ground High resistance
C) Short to ground
The sum of the voltage drops in a series circuit equals the ________. Question options: Amperage Resistance Source voltage Wattage
C) Source voltage
An ignition coil is an example of a ________. Question options: Solenoid Step down transformer Step up transformer Relay
C) Step up transformer
Calculate the total resistance and current in a 12 volt parallel circuit with three resistors of 4 ohms, 8 ohms, and 16 ohms, using any one of the five methods (calculator suggested). What is the total resistance and current? Question options: 22 ohms (0.4 amperes) 140 ohms (18 amperes) 4 ohms (3.0 amperes) 2.3 ohms (5.3 amperes)
D) 2.3 ohms (5.3 amperes)
A capacitor ________. A) Stores electrons B) Passes AC C) Blocks DC D) All of the above
D) All of the above
A capacitor ________. Question options: Stores electrons Passes AC Blocks DC All of the above
D) All of the above
A capacitor can be used in what components? A) A microphone B) A radio C) A speaker D) All of the above
D) All of the above
A capacitor can be used in what components? Question options: A microphone A radio A speaker All of the above
D) All of the above
An ignition coil operates using the principle of ________. Question options: Electromagnetic induction Self-induction Mutual induction All of the above
D) All of the above
Capacitors are commonly used as a ________. Question options: Voltage supply Timer Noise filter All of the above
D) All of the above
Electromagnetic interference can be reduced by using a ________. Question options: Resistance Capacitor Coil All of the above
D) All of the above
When charging a lead-acid (flooded-type) battery, ________. Question 81 options: The initial charging rate should be about 35 amperes for 30 minutes The battery may not accept a charge for several hours, yet still be a good (serviceable) battery The battery temperature should not exceed 125°F (hot to the touch) All of the above
D) All of the above
An electrical load ________. Question options: Has electrical resistance May be an electrical device May be unwanted resistance caused by corrosion All of these
D) All of these
Electricity moving through a conductor produces a magnetic field. This principle is used in which of the following? Question options: Ignition coil Starter motor Relay All of these
D) All of these
Knowledge of parallel circuit fundamentals is necessary to diagnose ________. Question options: Port fuel injection circuits Diesel glow plug circuits Add-on lighting circuits All of these
D) All of these
High resistance in a circuit can cause ________. Question options: Dim lights Slow motor operation Clicking of relays or solenoids Any of the above
D) Any of the above
How can the electromagnetic strength of an energized coil of wire be increased? Question options: Place an iron core in the middle of the coil Increase current flow through the coil Increase the number of turns in the coiled wire Any of these
D) Any of these
When load testing a battery, which battery rating is normally used to determine how much load to apply to the battery? Question 78 options: CA RC MCA CCA
D) CCA
If the resistance and the voltage are known, what is the formula for finding the current (amperes)? Question options: E=I×R I=E×R R=E×I I=E/R
D) I = E/R
A shorted circuit ________. Question options: Could include an open circuit Always causes the fuse to blow Both A and B Neither A nor B
D) Neither A nor B
Two light bulbs are wired in series and one bulb burns out (opens.) Technician A says that the other bulb will still work. Technician B says that the current will increase in the circuit because one electrical load (resistance) is no longer operating. Which technician is correct? Question options: Technician A only Technician B only Both technicians A and B Neither technician A nor B
D) Neither technician A nor B
What type of circuit is this? Question options: Open circuit Series circuit Parallel circuit Series-parallel circuit
D) Series-parallel circuit
Capacitors are often used as voltage ________. Question options: Conductors Resistors Transformers Shock absorbers
D) Shock absorbers
A braided wire running from the negative battery terminal to the body of a vehicle is known as a ________. A) Ground strap B) Redundant source C) Facilitating circuit D) None of these
A) Ground strap
Which chemical is used to strengthen lead grids in maintenance-free batteries? A) Calcium B) Antimony C) Copper D) None of these
A) Calcium
A PTC circuit protector prevents excessive current flow in a circuit by ________. A) Changing to a very high resistance B) Burning open C) Opening a set of contacts D) Grounding the current
A) Changing to a very high resistance
Which battery rating is tested at 0 deg F (-18 C)? A) Cold-cranking amperes (CCA) B) Cranking amperes (CA) C) Reserve capacity D) Battery voltage test
A) Cold-cranking amperes (CCA)
What term describes the movement of electrons from one atom to another? Question options: Electricity Energy transfer Chain reaction None of these
A) Electricity
Cold cranking amps refers to the current a battery produce while sustaining 7.2 volts at what temperature? A) 0 deg F B) 32 deg F C) 72 deg F D) -10 deg F
A) 0 deg F
Which of these wires is MOST likely used for starter motor high current circuits? A) 0 ga. B) 14 ga. C) 18 ga. D) 20 ga.
A) 0 ga.
A metric wire size of 2.0 mm2 is equivalent to ________ AWG size. A) 14 ga. B) 20 ga. C) 10 ga. D) 2 ga.
A) 14 ga.
Each automotive battery cell has an electrical potential of how many volts? A) 2.1 V B) 1.5 V C) 12.6 V D) None of these
A) 2.1 V
Which of these is the recommended gauge wire for automotive speakers? A) 20 ga. B) 0 ga. C) 00 ga. D) 10 ga.
A) 20 ga.
What battery rating is tested at 32 deg F? A) Cold-cranking amperes (CCA) B) Cranking amperes (CA) C) Reserve capacity D) Battery voltage test
B) Cranking amperes (CA)
Magnetic lines of flux flow very easily through objects with high reluctance. A) True B) False
B) False
An electrical conductor is an element with ________ electrons in its outer orbit. Question options: Less than 2 Less than 4 Exactly 4 More than 4
B) Less than 4
In automotive wiring systems, a terminal is made of ________. A) Plastic B) Metal C) Solder D) Nylon
B) Metal
A capacitor used for spike protection will normally be placed in ________ to the load or circuit. A) Series B) Parallel C) Either series or parallel D) Parallel with a resistor in series
B) Parallel
When a battery becomes completely discharged, both positive and negative plates become ________ and the electrolyte becomes ________. A) H2SO4/ Pb B) PbSO4/ H2O C) PbO2/ H2SO4 D) PbSO4/ H2SO4
B) PbSO4/H2O
Creating electricity by exerting force on a crystal is called ________. Question options: Electrochemistry Piezoelectricity Thermoelectricity Photoelectricity
B) Piezoelectricity
Like charges ________. Question options: Attract Repel Neutralize each other Add
B) Repel
Technician A says that maintenance-free batteries use a large amount of water. Technician B says that maintenance-free batteries use materials that reduce the amount of water used by the battery. Which technician is correct? A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B
B) Technician B only
This schematic shows ___.
Capacitor parallel
Wire A has a diameter of 0.032 inches. Wire B has a diameter of 0.102 inches and an AWG rating of 10. Which of these is MOST likely to be the AWG rating of Wire A? A) 20 ga. B) 14 ga. C) 12 ga. D) 5 ga.
A) 20 ga.
Reserve capacity is the number of minutes a battery can produce 10.5 volts with how many amps? A) 25 B) 10 C) 20 D) 30
A) 25
A twisted pair circuit has wire with at least ________ turns per foot. A) 9 B) 12 C) 5 D) 24
A) 9
Magnetic field strength is measured in ________. A) Ampere-turns B) Flux C) Density D) Coil strength
A) Ampere-turns
Where is the force of magnetic lines strongest in a bar magnet? A) At each end B) In the middle of the magnet C) Only at the north pole of the magnet D) None of these
A) At each end
The braiding of wire effectively ________ the creation of AC current around the conductors. A) Eliminates B) Multiplies C) Enhances D) None of these
A) Eliminates
A magnetic field can be measured using a ________. A) Gauss gauge B) Voltmeter C) Inductive pickup D) None of these
A) Gauss gauge
A positively charged atom is called a(n) ________. Question options: Ion Neutron Quark None of these
A) Ion
Six volt systems require ________ wires than 12 volt systems. A) Larger B) Smaller C) Equal D) None of these
A) Larger
Thick wires have a ________ AWG rating than thin wires. A) Lower B) Higher
A) Lower
Which term describes current flow produced in a complete circuit when a magnetic field is moved back and forth across the circuit path? A) Magnetic induction B) Electromagnetic reluctance C) Magnetic potential D) None of these
A) Magnetic induction
Which type of fuse can handle up to 80 amps? A) Maxi B) Mini C) ATO D) None of these
A) Maxi
Sponge lead is used for which battery components? A) Negative plates B) Positive plates C) Both A and B D) Neither A nor B
A) Negative plates
Which event causes the capacitor to retain a voltage potential? A) Open circuit B) Closed circuit C) Both A and B D) Neither A nor B
A) Open circuit
Most automotive circuits, except for some ignition components, use ________ wire. A) Primary B) Secondary C) Alternative D) None of these
A) Primary
A 10 amp fuse is normally what color? A) Red B) Blue C) Yellow D) Green
A) Red
The type of solder that should be used for electrical work is ________. A) Rosin core B) Acid core C) 60/40 with no flux D) 50/50 with acid paste flux
A) Rosin core
Carbon and silicon are examples of ________. Question options: Semiconductors Insulators Conductors Coulombs
A) Semiconductors
Which metal is the best conductor of electricity? A) Silver B) Copper C) Brass D) Gold
A) Silver
Which of these uses a movable core to act as an electric switch? A) Solenoid B) Relay C) Transistor D) None of these
A) Solenoid
Battery electrolyte is a mixture of water and ________. A) Sulfuric acid B) Lead peroxide C) Lead sulfate D) Sulfur Dioxide
A) Sulfuric acid
A technician is performing a wire repair on a circuit under the hood of a vehicle. Technician A says to use solder and adhesive-lined heat shrink tubing or a crimp-and-seal connector. Technician B says to solder and use electrical tape. Which technician is correct? A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B
A) Technician A only
Technician A says that copper jumper cables are better than aluminum jumper cables. Technician B says that aluminum jumper cables are better than copper jumper cables. Which technician is correct? A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B
A) Technician A only
Technician A says that magnetism can cause electric current to flow in a conductor. Technician B says that magnetic lines of flux can never penetrate rubber insulation on a conductor. Who is right? A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B
A) Technician A only
Technician A says that magnets are used in some crankshaft position sensors. Technician B says magnets are used in potentiometers. Which technician is correct? A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B
A) Technician A only
Technician A says that objects with high permeability allow magnetic lines of flux to flow easily through their material. Technician B says that some objects are good insulators that will not allow magnetic lines of flux to flow through their material. Which technician is correct? A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B
A) Technician A only
What makes a battery "low maintenance" or "maintenance free"? A) The alloy used to construct the grids B) The plates are constructed of different metals C) The electrolyte is hydrochloric acid solution D) The battery plates are smaller, making more room for additional electrolytes
A) The alloy used to construct the grids
An AGM battery differs from a conventional flooded battery in what way? A) The electrolyte is absorbed into glass separator and will not spill B) It does not contain electrolyte C) It does not contain lead D) Each cell has a voltage sensor
A) The electrolyte is absorbed into glass separator and will not spill
The higher the AWG number, ________. A) The smaller the wire diameter B) The larger the wire diameter C) The thicker the insulation D) The more strands in the conductor core
A) The smaller the wire diameter
A potentiometer, a three-wire variable resistor, is used in which type of sensor? Question options: Throttle position (TPS) Manifold absolute Pressure (MAP) Barometric Pressure Sensor (BARO) Knock Sensor (KS)
A) Throttle position (TPS)
Why is thick wire used for the battery-starter circuit? A) To carry high amperage current B) To carry high voltage C) Both of these D) Neither of these
A) To carry high amperage current
Most braided ground straps are ________. A) Uninsulated B) Insulated C) Made of high resistance wire D) None of these
A) Uninsulated
The largest percentage of automotive battery electrolyte is ________. A) Water B) Sulfuric Acid C) Potassium phosphate D) None of these
A) Water
A 20 amp fuse is normally what color? A) Yellow B) Blue C) Red D) Green
A) Yellow
Each cell of an automobile 12 volt battery can produce about ________ volts. A) 1.2 B) 2.1 C) 4.2 D) 4
B) 2.1
Which statements are TRUE about wire, terminals, and connectors? A) A wire is called a lead, and the metal end is a connector. B) A connector is usually a plastic piece where terminals lock in. C) A lead and a terminal are the same thing. D) Both A and C
B) A connector is usually a plastic piece where terminals lock in.
The skin effect involves ________ current flowing around the outside of a circuit. A) DC B) AC C) Equal D) None of these
B) AC
Which unit of electricity does the work in the circuit? Question options: Volt Ampere Ohm Coulomb
B) Ampere
Unlike magnetic poles ________ and like magnetic poles ________. A) Repel/ attract B)Attract/ repel C) Repel/ repel D) Attract/ attract
B) Attract/ repel
A charged capacitor acts like a ________. A) Switch B) Battery C) Resistor D) Coil
B) Battery
The conventional theory for current flow is being used to determine the direction of magnetic lines of force. Technician A says that the left-hand rule should be used. Technician B says that the right-hand rule should be used. Which technician is correct? A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B
B) Technician B only
Two technicians are discussing the operation of a capacitor. Technician A says that a capacitor can create electricity. Technician B says that a capacitor can store electricity. Which technician is correct? A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B
B) Technician B only
As temperature increases, ________. Question options: The resistance of a conductor decreases The resistance of a conductor increases The resistance of a conductor remains the same The voltage of the conductor decreases
B) The resistance of a conductor increases
The ________ is a unit of electrical pressure. Question options: Coulomb Volt Ampere Ohm
B) Volt
Stranded copper wire is used in most automotive electrical circuits because it ________. A) Bends more easily than solid wire B) Is an inexpensive but excellent conductor C) Both A and B D) Neither A nor B
C) Both A and B
Which statement is TRUE regarding the internal grids in automotive batteries? A) The grid is made mainly of lead B) The lead used to make the grid is enhanced with other elements for durability C) Both A and B D) Neither A nor B
C) Both A and B
Technician A says that a relay is an electromagnetic switch. Technician B says that a solenoid uses a movable core. Which technician is correct? A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B
C) Both technicians A and B
Technician A says that a two-wire variable resistor is called a rheostat. Technician B says that a three-wire variable resistor is called a potentiometer. Which technician is correct? Question options: Technician A only Technician B only Both technicians A and B Neither technician A nor B
C) Both technicians A and B
Technician A says that magnetic lines of force can be seen by placing iron filings on a piece of paper and then holding them over a magnet. Technician B says that the effects of magnetic lines of force can be seen using a compass. Which technician is correct? A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B
C) Both technicians A and B
Two technicians are discussing electromagnetic induction. Technician A says that the induced voltage can be increased if the speed is increased between the conductor and the magnetic lines of force. Technician B says that the induced voltage can be increased by increasing the strength of the magnetic field. Which technician is correct? A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B
C) Both technicians A and B
Two technicians are discussing fuse testing. Technician A says that a test light should light on both test points of the fuse if it OK. Technician B says that the fuse is defective if a test light only lights on one side of the fuse. Which technician is correct? A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B
C) Both technicians A and B
Two technicians are discussing ignition coils. Technician A says that some ignition coils have the primary and secondary windings electrically connected. Technician B says that some coils have totally separate primary and secondary windings that are not electrically connected. Which technician is correct? A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B
C) Both technicians A and B
A fully charged 12 volt battery should indicate ________. A) 12.6 volts or higher B) A specific gravity of 1.265 or higher C) 12 volts D) Both A and B
D) Both A and B
When discussing induced voltage caused by a magnetic field moving across a complete circuit, technician A says that the direction of current flow depends on the direction of movement of flux lines. Technician B says that the direction of current flow is called polarity. Which technician is correct? A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B
C) Both technicians A and B
Capacitors block the flow of ________ current but allow ________ current to pass. A) Strong; weak B) AC; DC C) DC; AC D) Weak; strong
C) DC; AC
The unit of measurement for capacitor rating is the ________. A) Ohm B) Volt C) Farad D) Ampere
C) Farad
Which battery rating is expressed in minutes? A) Cold-cranking amperes B) Cranking amperes C) Reserve capacity D) Battery voltage test
C) Reserve capacity
Solder that has been properly applied will have a ________ appearance. A) Dull brown B) White C) Shiny D) Spotted
C) Shiny
A charge indicator (eye) operates by showing green or red when the battery is charged and dark if the battery is discharged. This charge indicator detects ________. A) Battery voltage B) Specific gravity C) Electrolyte water pH D) Internal resistance of the cells
C) Specific gravity
Metric wire size is measured in units of ________. A) Meters B) Cubic centimeters C) Square millimeters D) Cubic millimeters
C) Sqaure millimeters
An ignition coil is an example of a ________. A) Solenoid B) Step down transformer C) Step up transformer D) Relay
C) Step up transformer
Deep cycling means ________. A) Overcharging the battery B) Overfilling or underfilling the battery with water C) The battery is fully discharged and then recharged D) The battery is overfilled with acid (H2SO4)
C) The battery is fully discharged and then recharged
An ignition coil operates using the principle of ________. A) Electromagnetic induction B) Self-induction C) Mutual induction D) All of the above
D) All of the above
Capacitors are commonly used as a ________. A) Voltage supply B) Timer C) Noise filter D) All of the above
D) All of the above
Electromagnetic interference can be reduced by using a ________. A) Resistance B) Capacitor C) Coil D) All of the above
D) All of the above
The positive battery plate is ________. A) Lead dioxide B) Brown in color C) Sometimes called lead peroxide D) All of the above
D) All of the above
What is TRUE about the plastic conduit covering the wiring? A) The color stripe is used to identify the temperature rating of the conduit. B) The color identifies the voltage level of the circuits being protected. C) It protects the wiring. D) All of the above
D) All of the above
How can the electromagnetic strength of an energized coil of wire be increased? A) Place an iron core in the middle of the coil B) Increase current flow through the coil C) Increase the number of turns in the coiled wire D) Any of these
D) Any of these
What causes a fuse to blow? A) A decrease in circuit resistance. B) An increase in the current flow through the circuit. C) A sudden decrease in current flow through the circuit. D) Both A and B are correct
D) Both A and B are correct
Many ground straps are uninsulated and braided because ________. A) They are more flexible to allow movement of the engine without breaking the wire B) They are less expensive than conventional wire C) They help dampen radio-frequency interference (RFI) D) Both A and C are correct
D) Both A and C are correct
Which statement is TRUE about fuse ratings? A) The fuse rating should be less than the maximum current for the circuit. B) The fuse rating should be higher than the normal current for the circuit. C) 80% of the fuse rating should equal the current in the circuit. D) Both B and C
D) Both B and C
What gasses are released from a battery when it is being charged? A) Oxygen B) Hydrogen C) Nitrogen and Oxygen D) Hydrogen and Oxygen
D) Hydrogen and Oxygen
The fact that voltage can be created by exerting force on a crystal is used for which type of sensor? Question options: Throttle position (TPS) Manifold absolute pressure (MAP) Barometric sensor (BARO) Knock sensor (KS)
D) Knock sensor (KS)
Capacitors are often used as voltage ________. A) Conductors B) Resistors C) Transformers D) Shock absorbers
D) Shock absorbers
Battery hold-down clamps or brackets help reduce ________, which can greatly reduce the capacity and life of any battery. A) Heat B) Temperature C) Cycling D) Vibration
D) Vibration