WorksheetsElectrics
Total questions: 60
Worksheet time: 2hrs 0mins
When testing the voltage of an ABS wheel speed sensor what would happen as the wheel slows
An inductive pick up sensor
A decrease in AC voltage
an increase in AC voltage
A decrease in DC voltage
an increase in DC voltage
An ohms test on a Thermister indicates 0C=4500 ohms 100C 200 ohms this type of thermister is
An inductive pick up sensor
Piezo crystal pressure sensor
Negative Temperature coefficient
Positive temperature coefficient
A gas discharge bulb contains what
A tungsten electrode,silver and metal salts
Wire elements,helium gas and metal salts
Electrodes,argon,silver and metal salts
Electrodes,Xenon,mercury and metal salts
What is the reflective part of an headlight called.
A lense
A parabolic
A condenser
A prism
How many satellites need to be in view for a sat nav to work
1
2
3
4
In an SRS system what occurs from 10 to15 milliseconds after impact
The pre tensioners start to tighten then airbag inflates
The air bag is inflated then the pre tensioners tighten up.
The airbag deflates and the pre tensioners loosen
The airbag inflates and the pre tensioners loosen
What does a central door locking actuator contain
Solenoid and gear
Motor and solenoid
Solenoid and rocker switch
Drive motor and gear
Flemmings left hand rule is related to what
Generators
Motors
Ohms law
Capacitors
what on a car uses a sun load sensor
Climate control
Central door locking
A car alarm
An electric window
A strain gauge pressure sensor incorporates the use of
A thermistor
Sensing resistors
Magnetic inductors
Piezo crystals
When checking an electric window or mirror, what should be checked first
Switch
fuse
wiring
motor
How many motors are there on an electric mirror
1
4
5
2
What would the symptom be if the system earth failed on an electric window circuit
The window would work halfway
Window would only go down
Window would not operate
Window would only go up
What is an electronic device that lets electric current flow only 1 way
Zenor diode
Capacitor
Transistor
Rectifier
How is the compressor engaged on an air conditioning system
using a solenoid
electromagnetically
Using magnets
Mechanically
What controls regenerative braking on an hybrid car
The brake pedal
The accelerator
The ABS modulator valves
All 4 wheel speed sensors
What does PWM stand for
Primary wired modules
Pulse weighted motors
Pulse width modulation
Pulse wired motors
Voltage is:
The flow of current in a circuit
The Resistance to current flow
Electrical Pressure in a circuit
The power output of a circuit
Electro Motive Force (EMF):
Is another name for Voltage
Is another name for Amps
Is another name for resistance
Is another name for power
Watts is a measurement of:
Current
pressure
resistance
power
A length of cable is identified as 28/0.30 This means that:
It has a handling capacity of 28 Amps and 0.30 Volts
it has a handling capacity of 28 Volts and 0.30 Amps
It has 28 strands of wire, each with a diameter of 0.30mm
It has 28 strands of wire, with a total diameter of 0.30mm
Before removing a battery from a vehicle what should a technician do first?
Disconnect the battery positive lead
Disconnect the battery negative lead
Discharge the battery totally
Disconnect the earth lead
Two identical lamps are connected in parallel with a 12V source.
The Voltage at each bulb will be 2 Volts
The Voltage at each bulb will be 4 Volts
The Voltage at each bulb will be 24 Volts
The Voltage at each bulb will be 12 Volts
One way to measure the current flowing in a circuit is to connect a suitable:
Voltmeter in series
Ammeter across the battery
Ammeter in series
Voltmeter in parallel
The power rating of a 12 Volt bulb in circuit with a current flow of 1.75 Amps is:
Resistance X Volts = 21V
Amps X Volts = 1.75A X 12V = 21 Ω
Amps X Volts = 1.75A X 12V = 21W
Amps - Volts = 1.75A - 12V = -10.25A
Before removing a coded radio / CD player, what should a technician do first?
Disconnect the battery
Retain the radio stations
Retrieve the radio code
Disconnect the wiring loom
What happens to resistance in parallel circuits?
As more components are added the resistance increases.
As more components are added the resistance decreases.
As more components are added the resistance stays constant
As more voltage is applied the resistance increases.
When checking resistance you should?
Disconnect the component
Disconnect the battery
Switch the ignition off
Make sure the battery is fully charged
An electric window has a broken earth. this will cause?
It will run slow
It will only go down
It will only go up
It will not operate
When using the power formula what maths function would you need to calculate current?
add
subtract
divide
multiply
Flemmings left hand rule is related to what?
Capacitors
ohms law
motors
generators
Regarding batteries; What does AGM stand for
Aggravated Glass Material
Alternative Gauze Material
Adhesive Glass Mat
Absorbent Glass Mat
How many motors are there on an electric mirror?
1
4
2
3
Battery capacity can be shown as reserve capacity. Which statement is correct? e.g 110RC
Reserve capacity is time based - current draw of 25A @ 26.7C
The battery will last for 110 Minutes when drawing 100A
Reserve capacity is time based - current draw of 25A @ 80C
Reserve capacity is current based-Voltage draw of 12.6V @80C
What type of actuator is used on a remotely switched fuel flap release?
A motor and gear actuator
A pneumatic motor
A stepper motor
An electric solenoid
What device is used to control the duration of the heater systems operation?
A regulator and a relay
A relay and timer
A thermistor and relay
A relay and resistor
The door lock actuators are wired in:
series then parallel
parallel then series
parallel
series
What electrical component has a low resistance to flow in one direction and a high resistance (preferably infinite) to flow in the other direction?
diode
fuse
regulator
relay
What electrical principle causes an electrical motor to stop immediately?
Regenerative braking
Electro-magnetic induction
Electro-motive force
OHMs Law
12v series circuit there are 3 bulbs . What is the volt drop across each bulb in the circuit?
12v
6.6v
4v
3v
Which resistive component is designed to be temperature sensitive?
Potentiometer
Thermistor
Rheostat
photoconductive
Which part of an atom has no electrical charge?
Electron
Neutron
Proton
All of the above
An electric current is a flow of charged particles
true
false
maybe
maybe not
One way to measure the current flowing in a circuit is to connect a suitable:
Voltmeter in series
Ammeter across the battery
Ammeter in series
Voltmeter in parallel
Conventional electron flow:
Has electrons flowing from negative to positive.
Is used for circuit fault finding.
Has current flowing from negative to positive
Has electrons flowing from positive to negative.
If the Voltage in this circuit was 6 V, what is the current Flow?
0.15 A
240v
40 ohms
40A
When the engine is being cranked, battery volts should not drop less than: >
12v
11v
10v
9v
A 12v circuit has 4 lamps connected in parallel. Each lamp is 6 watt. Calculate AMPS
0.5 amps
2 amps
2.4amps
4 amps
Before testing an unfamiliar electronic component for the first time, always.
Use a voltmeter with clip ends
Check the current flow with an ammeter
Check the test procedure in the workshop manual
Connect an ohmmeter in series with the component
In a lead acid battery, distilled water and sulphuric acid are mixed together to make
The positive plate
The negative plate
electrolyte
Sulphur plates
An ohmmeter
Should not be used to test a battery
May be placed between positive terminals
May be placed between negative terminals
Can be used to test a battery >
A bad earth connection on a rear lamp may cause the light
To go dim
To change colour
To go very bright
To flash at regular intervals
The output of an alternator
Depends on the number of slip rings
Varies with the state of charge of the battery
Depends on the state of the weather
Is controlled by the rectifier
A thermistor is a type of
Sensor that is pressure sensitive
Sensor that is temperature sensitive
Diode that is temperature sensitive
Transistor that is temperature sensitive
What type of impact is a curtain shield airbag designed to protect the occupants from?
no impact
front impact
side impact
rear impact
What gas is used to inflate the airbag
nitrogen
oxygen
Krypton
hydrogen
On a hybrid, what is meant by 'regenerative braking'
Brake fluid recirculates
Generator acts like a motor
Parking brake is applied
motor acts like a Generator
The battery earth wire gets hot during cranking the engine, the main fault for this is....
a loose starter supply cable
an open circuit earth connection
A high resistance earth connection
A low resistance earth connection
What are the symptoms likely to be if the alternator warning light bulb has blown
Battery will not charge
Battery charges at low speed
Battery charges at high speed
Battery will overcharge
What is the correct procedure to check for a parasitic drain
Ignition off, remove Earth + connect ammeter in series
Ignition off, remove positive + connect voltmeter in series
Ignition off, remove both leads + connect voltmeter in parallel
Ignition off, remove positive + connect ohmmeter in series
