Automotive Electrical Systems Quiz

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.

When looking at a waveform on an oscilloscope, what does the vertical line represent?

• a. Volts

• b. Amps

• c. Time

• d. Ohms

Which component converts AC to DC in an alternator?

• a. A relay

• b. A rectifier

• c. A coil pack

• d. A voltage regulator

Why does a roof aerial have a live feed wire connected to it?

• a. To raise and lower the aerial

• b. To operate an aerial amplifier

• c. To switch the aerial on and off

• d. To create a weaker aerial signal

What should a Technician check when diagnosing a faulty alternator?

• a. The battery reserve capacity

• b. The charge rate at the battery

• c. The starter motor current draw

• d. The alternator internal resistance

What would be the simplest way to diagnose a faulty horn switch?

• a. Check the operation with an oscilloscope

• b. Remove the dashboard and trace the wiring

• c. Carry out an actuator test with a code reader

• d. Run a wire from another car and press the horn on that car

Why must a hybrid vehicle incorporate a DC-to-DC convertor?

• a. To maintain a constant voltage

• b. To enable regeneration to take place

• c. To reduce high voltage to low voltage

• d. To allow the alternator to charge the high voltage battery

What is the power consumed by a vehicle’s horn, when the voltage supplied is 12 Volts and the current flow is 3 Amps?

• a. 0.75 Watts

• b. 4 Watts

• c. 15 Watts

• d. 36 Watts

Which of the following DIN numbers would indicate an ignition live on a wiring diagram?

• a. 10

• b. 15

• c. 30

• d. 31

What is the system called that emits a warning when the vehicle crosses the white line on the road without using indicators?

• a. Blind spot alert

• b. Lane departure

• c. Lane change assist

• d. Collision avoidance