Electrical revision

What is the function of the Clock Spring?

• To measure the time differencebetween the triggering of the twoSRS sensors

• To prevent premature wear andbreakage of the wiring to thesteering wheel

• To enable the correct timing ofthe seat belt pre-tensioner andthe airbag

• To allow the horn switch to befitted to an airbag steering whee

Match the following

• The ECU receives data from the sensors

• 25-30 ms

• Seatbelt pre tensioners fire

• 30-40 ms

• Airbag inflated

• 20-25 ms

• air bag begins to inflate

• 50-70 ms

• occupant makes contact with the airbag

• 5-10 ms

Bulb components

Groups:

(a) Halogen

,

(b) HID

,

(c) LED

,

(d) Incandescent

• vacuum

• Xenon gas

• Tungsten electrode

• halogen gas

• + doped semi-conductor

• Metal halides

• tungsten filament

• filament

• quartz crystal

• • - doped semi-conductor

A Sat-Nav system needs ________ satelites in view to give an accurate location

How do you measure parasitic draw?

Answer explanation

Ammeter in series, with all consumers off.

Draw the wave form produced by a Hall Effect sensor.

Answer explanation

Voltage remains the same, frequency chnages with speed.

Draw the wave form produced by an inductive sensor

Answer explanation

Voltage and frequency will change with speed.

Where would be the best place to measure current draw in this circuit?

Match the following

• Heat transfer through waves

• Conduction

• Heat transfer through a solid

• Convection

• Heat transfer through a liquid

• Radiation

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