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WorksheetsLevel 3 Electrics
Total questions: 36
Worksheet time: 18mins
Which DIN number represents permanent battery supply?
4
15
30
31
Against which of the following does a fuse protect an electrical circuit?
short circuit failiure
open circuit failiure
Excessive resistance
Very low resistance
What are thermistors used to provide information on?
Pressure
Speed
Temperature
Position
Before connecting a digital ohmmeter to a circuit, a technician should first
Make tea
operate the circuit
install new batteries
verify the circuit is electricaly isolated
Two identical lamps are wired in parrallel to a 12 volt source. What will the voltage be across both lamps
6 volts
4 volts
2 volts
12 volts
what is the component shown in the image above
starter casing
pinion drive
starter solonoid
starter armature
What is the main purpose of the overrunning clutch on a starter motor?
To assist solonoid
To pull starter pinion out of mesh
To disengage the armature when the engine starts
To allow over- run
When accurately performing a heavy load discharge test on battery, the battery must be charged at least
25%
50%
75%
100%
A battery that is under charged for periods of time will become
dead
cycled
over heated
Sulphated
A technician is using a digital ohmmeter to check component continuity. A reading of "OL" would indicate
open circuit
short circuit
correct continuity
Internal short circuit
One way of measuring current in a circuit is to connect a suitable
voltmeter in series
amnmeter across the battery
voltmeter in parrallel
amnmeter in series
Conventional theory of current flow states that current will flow from
randomly
positive to negative
negative to positive
none of the above
Multiplexing was invented by which company for automotive applications
Delco
Nippon Denso
Bosch
Lucas
In a Serial Bus network, what is the size of the resistors at each end of the Bus
30 ohms
40 ohms
60 ohms
80 ohms
HS CAN and MS CAN are two common networks. What does CAN mean?
Controlled area network
Complete area network
Constant area network
Controllor Area Network
In Binary code , what Number is represented by 1011010
16
32
45
90
Which connection in the socket shown is a 12 volt Permanent supply. Pin 1 is top left
Pin 1
Pin 6
Pin 8
Pin 16
Why is the Instrument cluster important in a serial Bus network?
It provides driver input
It is the Gateway link between the CAN Bus networks
none of the above
It provides the gateway link between driver and Can bus
Twisted pairs are common with network connections.Why do we use two wires twisted together like this?
To allow multiple signals
To provide interferance protection by delivering the same signal, one of which is inverted down each wire
To provide priority function
To provide Interferance protection by delivering same signal down each wire
What is the Baud rate of HS CAN Bus network
125Kbs/sec
24 Kbs/sec
1.95 Kbs/sec
500 Kbs/sec
Which of these does not provide an input to an ECU
Magnetic pick up
Variable resistor
Display
Switch
Which of these is not connected to an ECU output
Vaccum controllor
Idle actuator
Fuel pressure regulator
Engine temperature sensor
Why is it important to have stable voltages supplied to sensors
To avoid damage
To prevent them acting as switches
To prevent them providing false readings
To prevent them becoming actuators
Which of the following is a function of the central processing unit(CPU)?
Measuring voltages
Making decisions
Setting clock frequency
Manufacturing logic gates
ROM(read only memory)
Contains program to control ECU
Program is vehicle generic
Information cannot be changed
All of the above
Random Acess Memory (RAM) is
All of the below
Used by CPU to store and retrieve data
Data is lost when power is removed
Temporary memory
The CPU( Central processing unit)
Contains hundreds of logic gates which operate with binary numbers
Can be removed
Is hydraulically operated
Programmable Read Only Memory(PROM/EPROM)
Is vehicle specific
Can be updated
is read only
is all of the above
Keep Alive Memory (KAM)
Stores adaptive stratergies
Supplies default data if fault occurs
Has own battery to protect data
Is all of the above
Which of the following types of memory will lose data when the power is switched off?
PROM
KAM
ROM
RAM
Which type of memory contains generic information to contrl the ECU?
ROM
RAM
PROM
KAM
Moisture is a hazard to ECU,s because it can coat insulators and allow them to conduct electricity
TRUE
FALSE
Static electricity transfer can be prevented by wearing rubber gloves.
TRUE
FALSE
The ECU has three stages of operation , they are called
First second and third stages
INPUT ,PROCESS,OUTPUT
Output modulation
What fuse is required to protect a 100 watt speaker in a 12 volt system?
8amp
10 amp
12 amp
24 amp
If a circuit has 6 amps of current flowing, what will be the resistance in the circuit?
2ohms
3ohms
4ohms
5 ohms
