ATEC 22B 3-33 Final
On a wiring diagram, S110 with a ".8 BRN/BLK" means..................
A splice of a brown with black stripe, wire size being 0.8 square millimeters (18 gauge AWG)
A meter is used to measure amperes is called a(n) _________
Ammeter
Unlike magnetic poles ___, and like magnetic poles ____
Attract; Repel
The unit of measurement for capacitor rating is the ___________
Farad
A digital meter that can show waveforms is a........................
GMM
An oscilloscope display is called a...........................
Graticule
A high-impedance meter _______
Has a high internal resistance
Cycles per second are expressed in........................
Hertz
If the resistance and the voltage are known, what is the formula for finding the current (amperes)?
I=E/R
A voltmeter should be connected to the circuit being tested _________
In parallel
If the voltage increases in a circuit, what happens to the current (amperes) if the resistance remains the same?
Increases
The fact that a voltage can be created by exerting force on a crystal is used in which type of sensor?
Knock Sensor (KS)
A capacitor can be used in what components?
Microphone Radio Speaker
Two bulbs are connected to a 12 volt battery in parallel. Another bulb is added in parallel. Technician A says that the third bulb will be dimmer than the other two bulbs due to reduced current flow through the filament of the bulb. Technician B says that the amount of current flowing from the battery will decrease due to the extra load. Which technician is correct?
Neither Technician A nor B
Two light bulbs are wired in series and one bulb burns out (opens) Technician A says that the other bulb will 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?
Neither Technician A nor B
The sum of the voltage drops in a series circuit equals the ______.
Source voltage
Metric wire size is measured in units of..........................
Square millimeters
A capacitor _________
Stores electrons Passes AC Blocks DC
The Amperage in a series circuit is _____
The same anywhere in the circuit
A potentiometer, a three-wire variable resistor, is used in which type of sensor?
Throttle Position (TP)
Where is connector C250 located?
Under the dash
The _____ is a unit of electrical pressure.
Volt
Capacitors are often used as "suppression capacitors". What does a capacitor suppress?
Voltage Fluctuations
Capacitors are commonly used as a __________
Voltage supply Timer Noise filter
Which unit of electricity does the work in a circuit?
ampere
What could happen if the meter leads were connected to the positive and negative terminals of the battery while the meter and leads were set to read amperes?
could blow an internal fuse or damage the meter.
An electrical conductor is an element with ________ electrons in its outer orbit.
less than 4
Like Charges
repel
Carbon and Silicon are examples of ___
semiconductors
Which statements are TRUE about wire, terminals, and connectors?
A connector is usually a plastic piece where terminals lock in.
What causes a fuse to blow?
A decrease in circuit resistance An increase in the current flow through the circuit
Inductive ammeters work because of what principle?
A magnetic Field surrounds any wire carrying a current.
When testing a relay using an ohmmeter, which two terminals should be touched to measure the coil resistance?
86 and 85
Which relay terminal is the normally closed (NC) terminal?
87a
If a digital meter face shows 0.93 when set to read kohm, the reading means_______
930 ohms
A reading of 432 shows on the face of the meter set to the millivolt scale. The reading means ________
0.432 volt
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?
1 ampere
How many watts are consumed by a starter motor if it draws 150 amperes at 10 volts?
1,500 watts
A throttle position sensor waveform is going to be observed. At what setting should the volts per division be set to see the entire waveform from 0 volts to 5 volts?
1.0 V/div
Two identical bulbs are connected to a 12 volt battery in parallel. The voltage drop across the first bulb is 12 volts as measured with a voltmeter. What is the voltage drop across the bulb?
12 volts
How many watts are consumed by a lightbulb if 1.2 amperes are measured when 12 volts are applied?
14.4 watts
Three resistors are connected in parallel to a 12 volt battery. The total current flow from the battery is 12 amperes. The first resistor is 3 ohms and the second resistor is 6 ohms. What is the value of the third resistor?
2 ohms
The highest amount of resistance that can be read by the meter is set t the 2kohm scale is ________
2,000 ohms
Calculate the total resistance and current in a parallel circuit with three resistors of 4ohm, 8ohm, 16ohm, using any one of the five methods (calculator suggested). What are the values?
2.3 ohms (5.3 amperes)
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?
200 amperes
Three resistors are connected to a 12 volt battery in parallel. The current flow through each resistor is 4 amperes. What is the value of the resistors?
3 ohms
If 12 volts are being applied to a resistance of 3 ohms, ________ amperes will flow.
4
A 6-cylinder engine uses six fuel injectors connected electrically in two groups of three injectors in parallel. What would be the resistance if the three 12 ohms injectors were connected in parallel?
4 ohms
Setting the time base to 50 ms per division will allow the technician to view a waveform how long in duration?
500 ms
Oscilloscope use what type of lead connector?
BNC
A charged capacitor acts like a ___________
Battery
Technician A says that a good relay should measure between 60 and 100 ohms across the coil terminals. Technician B says that OL should be displayed on an ohmmeter when touching terminals 30 and 87. Which technician is correct?
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?
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?
Both Technicians A and B
Technician A says that magnetic lines of force can be seen by placing iron fillings 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?
Both Technicians 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 that the current (amperes) varies depending on the value of the resistance in a series circuit. Which technician is correct?
Both Technicians A and B
Technician A says that there is often more than one circuit being protected by each fuse. Technician B says that more than one circuit often shares a single ground connector. Which technician is correct?
Both Technicians A and B
Two technician 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?
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?
Both Technicians A and B
A diode installed across a coil with the cathode toward the battery positive is called a(n)_______.
Clamping diode
To increase the capacity, what could be done?
Connect another capacitor in parallel
Capacitors block the flow of _______ current but allow __________ current to pass.
DC; AC
A vehicle has four taillight bulbs all connected in parallel if one bulb burns out (opens), the total current flow in the circuit _________.
Decrease because only three bulbs are wired in parallel
High resistance in an electrical circuit can cause ______
Dim lights Slow motor operation Clicking of relays or solenoids
What is the symbol for voltage used in calculations?
E
An ignition coil operates using the principle(s) of ____
Electromagnetic Induction Self induction Mutual induction
Two technician are discussing finding a short to ground using a test light. Technician A says that the test light, connected in place of the fuse, will light when the circuit that has the short is disconnected. Technician B says that the test light should be connected to the positive(+) and negative(-) terminals of a battery during this test. Which technician is correct?
Neither Technician A nor B
A meter is set to read DC volts on the 4 volt scale. The meter leads are connected at a 12 volt battery. The display will read ________
OL
An ohmmeter should be connected to the circuit or component being tested_______
Only when no power is flowing (electrically open circuit)
A capacitor used for spike protection will normally be placed in _____ to the load circuit.
Parallel
Creating electricity by exerting a force on a crystal is called ___
Piezoelectricity
For an electrical device to operate, it must have.....................
Power and Ground
Voltage signals (waveforms) that do not go below zero are called.................
Pulse Trains
Electromagnetic interference can be reduced by using a _________.
Resistance Capacitor Coil
The type of solder that should be used for electric work is _________
Rosin Core
If two insulated (power side) wires were to melt together at the point where the copper conductors touched each other, the type of failure would be called a(n)______
Short-to-Voltage
If an insulated (power side) wire gets rubbed through a part of the insulation and the wire conductor touches the steel body of a vehicle, the type of failure would be called a(n)_______
Short-to-ground
Which circuit failure is most likely to cause a fuse to blow?
Short-to-ground
All switches illustrated in schematics are...........................
Shown in their normal position
if a wire repair, such as repairs made under the hood or under the vehicle is exposed to the elements, which type repair should be used?
Solder and adhesive-lined heat shrink or crimp-and-seal connectors
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?
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?
Technician A only
A signal showing the voltage of a battery displayed on a digital storage oscilloscope (DSO) is being discussed. Technician A says that the display will show one horizontal line above the zero line. Technician B says that the display will show a line sloping upward from zero to the battery voltage level. Which technician is correct?
Technician A only
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?
Technician A only
Two technicians are discussing the DC coupling setting on a DSO. Technician A says that the position allows both the DC and AC signals of the waveform to be displayed. Technician B says that this setting allows just the DC part of the waveform to be displayed. Which technician is correct?
Technician A only
A vehicle has four parking lights are connected in parallel and one of the building burns out. Technician A says that this could cause the parking light circuit fuse to blow (open). Technician B says that it would decrease the total current in the circuit. Which Technician is correct?
Technician B only
All brake lights are dimmer than normal. Technician A says that bad bulbs could be the cause. Technician B says that high resistance in the brake switch could be the cause. Which technician is correct?
Technician B only
Four resistors are connected to a 12 volt battery in series. The values of the resistors are 10, 100, 330, and 470 ohms. Technician A says that the greatest voltage drop will occur across the 10 ohm resistor. Technician B says that the greatest voltage drop will occur across the 470 ohm resistor. Which technician is correct?
Technician B only
Half of the dash is dark. Technician A says that a defective dash light dimmer can be the the cause because it is in series with the bulbs that are in parallel. Technician B says that one or more bulbs could be defective. Which technician is correct?
Technician B only
Technician A says that an analog scope can store the waveform for viewing later. Technician B says that the trigger level has to be set on most scopes to be able to view a changing waveform. Which technician is correct?
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 rules should be used. Technician B says that that right-hand rule should be used. Which technician is correct?
Technician B only
Three light bulbs are wired in series. A fourth bulb is connected to the circuit in series. Technician A says that the total voltage drop will increase. Technician B says that the current (amperes) will decrease. Which technician is correct?
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?
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?
Technician B only
A short circuit can be located using a................
Test Light Gauss gauge Tone Generator
If an accessory such as an additional light is spliced into an existing circuit in parallel, what happens?
The current increases in the circuit.
Which statement is TRUE about fuse ratings?
The fuse rating should be higher than the normal current for the circuit. Of the fuse rating, 80% should equal the current in the circuit.
As temperature increases, _____
The resistance of a conductor increases
The higher the AWG number....................
the smaller the wire diameter
Many ground straps are uninsulated and braided because ________.
they are more flexible to allow movement of the engine without breaking the wire they help dampen radio-frequency interference (RFI)
