NEW
Font size
S
M
L
XL
WorksheetsAYES A6 Electrical Practice Exam
Total questions: 50
Worksheet time: 2hrs 40mins
Name
Class
Date
1.
Semiconductors are made useful as conductors through which of these processes?
a)
Doping
b)
Electrolysis
c)
Purification
d)
Ionization
2.
In an electrical circuit, a diode functions as a:
a)
valve.
b)
timing device.
c)
resistor.
d)
fuse.
3.
What is the purpose of a rectifier circuit?
a)
To convert DC voltage to AC
b)
To convert AC voltage to DC
c)
To smooth out voltage pulsations
d)
To create square wave AC
4.
Which of these are advantages of using light emitting diodes (LEDs) over incandescent lamps?
a)
LEDs are less expensive.
b)
LEDs produce more light and operate at higher voltages.
c)
LEDs are not current or voltage sensitive.
d)
LEDs produce less heat and require less current to operate.
5.
Which part of a computer receives information and makes decisions based on its programming?
a)
ROM
b)
CPU
c)
CDR
d)
RAM
6.
To prevent damage to a control module, which of these does a grounding type switch always use?
a)
Diode
b)
Capacitor
c)
Resistor
d)
Transistor
7.
In a thermistor, electrical resistance decreases as:
a)
voltage increases.
b)
voltage decreases
c)
temperature increases.
d)
temperature decreases.
8.
When a normally closed relay is energized, its contacts:
a)
make contact.
b)
turn on.
c)
open.
d)
close.
9.
In a cruise control system, which component controls the amount of vacuum that is applied to the servo unit?
a)
The transducer.
b)
The throttle body.
c)
The Cruise switch
d)
The brake pedal position switch
10.
In some vehicles, any of these actions may cancel the cruise control function EXCEPT:
a)
applying the brakes.
b)
accelerating the vehicle.
c)
driving full throttle up a very steep hill.
d)
shifting gears in a manual transmission vehicle.
11.
In an electronically controlled cruise control system, which of these is used to monitor vehicle speed?
a)
Vehicle speed sensor
b)
Wheel speed sensor
c)
Generator speed sensor
d)
Turbine speed sensor
12.
Even if the battery becomes disconnected during a vehicle crash, which of these enables an air bag to deploy in an accident?
a)
A backup power supply.
b)
A mechanical push-arm igniter
c)
The velocity versus solid object sensor
d)
A "sudden stop" signal received from the vehicle speed sensor
13.
Which of these air bag components are serviceable?
a)
Airbag module
b)
Igniter assembly
c)
Mounting plate
d)
Bag assembly
14.
Though different manufacturers have different specifications, how fast must a vehicle be moving before the air bag system is armed and ready to deploy if needed?
a)
Any speed above zero
b)
Between 3 and 10 mph
c)
Between 12 and 28 mph
d)
At least 45 mph
15.
When servicing an air bag, what is the first step a technician should take?
a)
Disconnect the impact sensors.
b)
Disconnect the clockspring electrical connector.
c)
Take resistance measurements at all electrical connectors.
d)
Disconnect the battery negative cable.
16.
Air bag modules should be stored with the horn pad:
a)
on its end.
b)
on its side.
c)
facing up.
d)
facing down.
17.
Which of these specifies repair times?
a)
New model training manual
b)
OE Service Manual
c)
Technical Service Bulletins (TSBs)
d)
Flat-rate manual
18.
The type of test instrument (meter) that uses a sweeping needle and a scale to display test values is called a/an:
a)
analog meter.
b)
digital meter.
c)
oscilloscope.
d)
logic probe.
19.
When using a voltmeter, the black lead should be connected to:
a)
the hot side of the circuit.
b)
the positive side of the circuit or component.
c)
the ground side of the circuit of component.
d)
either side of the circuit.
20.
When using an ohmmeter, how should the leads be placed in relation to the circuit or component being tested?
a)
In parallel, with the power off
b)
Across the load, with power on
c)
In-line
d)
In-series
21.
When using an ammeter, the red lead should be connected:
a)
to the side of the connector closest to the positive side of the battery.
b)
to the side of the connector farthest from the positive side of the battery.
c)
to the side of the connector closest to the negative side of the battery.
d)
to ground.
22.
A diode that has high resistance or an infinite reading in both directions is considered:
a)
open.
b)
shorted.
c)
in perfect working order.
d)
reverse-biased.
23.
A scan tool connects to the vehicle communication system by way of the:
a)
data link connector.
b)
relay panel.
c)
ignition switch.
d)
fuse panel.
24.
Which of these is true regarding a lab-type oscilloscope?
a)
It averages the voltage readings before displaying them.
b)
Time is displayed along the vertical axis and current is displayed along the horizontal axis.
c)
Time is displayed along the vertical axis and voltage is displayed along the horizontal axis.
d)
Time is displayed along the horizontal axis and voltage is displayed along the vertical axis.
25.
On a lab-type oscilloscope, the voltage level that must be reached to start the pattern sweep is called the:
a)
pulse.
b)
trigger.
c)
trip signal.
d)
activiation signal.
26.
The type of DC waveform in which the signal voltage is high and low for equal amounts of time is called:
a)
a sine wave.
b)
a 50% duty cycle waveform.
c)
a pulse width modulated waveform.
d)
a stepped waveform
27.
The number of times a wave repeats in a second is called:
a)
amplitude.
b)
time base.
c)
period.
d)
frequency.
28.
Duty cycle is the ratio of:
a)
"on time" compared to the complete cycle, expressed as a percentage.
b)
pulse width compared to the complete cycle, expressed as a frequency.
c)
a signal's frequency compared to its voltage, expressed as a percentage.
d)
a signal's amplitude compared to its frequency, expressed as a percentage.
29.
Which of these will calculate circuit current?
a)
Multiply volts times watts.
b)
Multiply volts times ohms.
c)
Divide ohms by volts.
d)
Divide volts by ohms.
30.
Which of these methods will calculate circuit resistance?
a)
Divide amps by volts.
b)
Divide volts by amps.
c)
Multiply volts times amps.
d)
Multiply amps times ohms.
31.
All of these can cause unwanted voltage drop in a circuit EXCEPT:
a)
corroded connectors.
b)
oversized conductors.
c)
loose wires.
d)
overheated connectors.
32.
If one copper wire is larger in diameter than another but the lengths are the same, the larger diameter wire offers:
a)
less current flow.
b)
more voltage drop.
c)
more heat buildup.
d)
less resistance.
33.
Which of these materials is a semiconductor?
a)
Silver
b)
Gold
c)
Copper
d)
Silicon
34.
Which of these describes a characteristic of two resistors connected in series?
a)
There will be only one path for current to flow.
b)
They will have different amounts of current flowing through them.
c)
They will each offer the same resistance.
d)
Voltage drop will be equal across each resistor.
35.
Which of these statements correctly describes the basic law of magnetism?
a)
Charged poles repel and uncharged poles attract.
b)
Unlike poles repel and like poles attract.
c)
North poles repel and south poles attract.
d)
Like poles repel and unlike poles attract.
36.
What happens when one resistor in a series circuit opens?
a)
The current is zero at all resistors.
b)
The current in the other resistor is at maximum.
c)
The voltage drop increases.
d)
The current goes up.
37.
Which of these statements is true regarding a series circuit with unequal resistances?
a)
The lowest resistance has the most current.
b)
The highest resistance has the most current.
c)
The highest resistance has the highest voltage drop.
d)
The lowest resistance has the highest voltage drop.
38.
Which of these is true regarding a parallel circuit with unequal branch resistance?
a)
The current is higher in the lowest resistance branch.
b)
The current is equal in all branches.
c)
The current is higher in the highest resistance branch.
d)
The voltage is higher in the lowest resistance branch.
39.
The total resistance of a series circuit is:
a)
the same as each individual resistor.
b)
equal to all branches.
c)
lower than individual resistances.
d)
the sum of the individual resistances.
40.
In a circuit with three parallel branches, if one branch opens, the total current will:
a)
decrease.
b)
increase.
c)
stay the same.
d)
cause the fuse to blow.
41.
An ohmmeter may be used to test for:
a)
resistance
b)
voltage.
c)
current.
d)
power.
42.
Which of these is true regarding series-parallel circuits?
a)
Only one current path is possible.
b)
Voltage drops are equal across each load.
c)
Current is equal throughout the circuit.
d)
Voltage applied to the parallel branches is source voltage minus any voltage drop across loads in series.
43.
Another name for a break or interruption in an electrical circuit is:
a)
a short
b)
an open
c)
a ground.
d)
a voltage drop.
44.
The amperage in a series circuit is:
a)
the same throughout the entire circuit.
b)
different, depending on the number of loads.
c)
sometimes the same, depending on the number of loads.
d)
never the same in two palces in a circuit.
45.
A short to ground in a circuit causes:
a)
current flow to decrease.
b)
an increase in circuit resistance.
c)
voltage to increase.
d)
current flow to increase.
46.
Three lamps are connected in parallel. What would happen if one lamp burns out?
a)
Total circuit resistance goes up.
b)
The other two lamps would go out.
c)
Current flow would increase through the "good" lamps.
d)
Voltage at the other two lamps would increase.
47.
Resistance in a copper wire may be affected by any of these EXCEPT:
a)
its color
b)
its diameter.
c)
its length.
d)
its temperature.
48.
Technician A says that adding more branches to a parallel circuit reduces total circuit resistance. Technician B says that adding more branches to a parallel circuit increases the total current flowing in the circuit. Who is right?
a)
Technician A only.
b)
Technician B only.
c)
Both Technician A and B.
d)
Neither Technician A nor B.
49.
The sum of all voltage drops in a series circuit equals the:
a)
Source voltage.
b)
Voltage applied to the largest load.
c)
Voltage applied to the smallest load.
d)
Voltage measured at the ground connection.
50.
Which of these could cause current flow to be below specifications?
a)
Low resistance
b)
High voltage
c)
High resistance
d)
A short circuit
Reset
