WorksheetsL3 - 7270/7290 - 457 Diagnose - Rectify Veh Aux Elec Faults
Total questions: 15
Worksheet time: 8mins
Which component converts AC to DC in an alternator?
A relay.
A rectifier.
A coil pack.
A voltage regulator.
Which of the following DIN numbers would indicate an ignition live on a wiring diagram?
10
15
30
31
What should a Technician check when diagnosing a faulty alternator?
The battery reserve capacity.
The charge rate at the battery.
The starter motor current draw.
The alternator internal resistance.
When looking at a waveform on an oscilloscope, what does the vertical line represent?
Volts.
Amps.
Time.
Ohms.
What is the system called that emits a warning when the vehicle crosses the white line on the road without using indicators?
Blind spot alert.
Lane departure.
Lane change assist.
Collision avoidance.
Why must a hybrid vehicle incorporate a DC-to-DC convertor?
To maintain a constant voltage.
To enable regeneration to take place.
To reduce high voltage to low voltage.
To allow the alternator to charge the high voltage battery.
What does a GPS rely on for accuracy?
An accurate atomic clock.
Sensors in the road surface.
ECU updates from a satellite.
Satellite navigational programme.
What would be the simplest way to diagnose a faulty horn switch?
Check the operation with an oscilloscope.
Remove the dashboard and trace the wiring.
Carry out an actuator test with a code reader.
Run a wire from another car and press the horn on that car.
When diagnosing a fault with an inductive type ABS sensor, the Technician should first disconnect the sensor and then test it with
a test light.
an ammeter.
an ohmmeter.
a fused jumper wire.
What test equipment can be used to check the correct operation of the CAN bus system on a modern vehicle?
Ammeter.
Oscilloscope.
Digital voltmeter.
An analogue voltmeter.
What is the power consumed by a vehicle’s horn, when the voltage supplied is 12 Volts and the current flow is 3 Amps?
0.75 Watts.
4 Watts.
15 Watts.
36 Watts.
Why does a roof aerial have a live feed wire connected to it?
To raise and lower the aerial.
To operate an aerial amplifier.
To switch the aerial on and off.
To create a weaker aerial signal.
In what state is air conditioning refrigerant when it leaves the compressor?
High pressure, high temperature gas.
Low pressure, High temperature gas.
Low pressure, low temperature liquid.
High pressure, high temperature liquid.
When replacing an air-conditioning pipe, why is it important to blank off connections?
To stop the expansion valve from overheating.
So that oil cannot escape from the condenser.
To stop dirt and moisture entering the system.
So that gas cannot escape from the evaporator.
What can activate an airbag if a vehicle's battery is damaged during an accident?
A diode.
A resistor.
A transistor.
A capacitor.
