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

• occupant makes contact with the airbag

• 30-40 ms

• The ECU receives data from the sensors

• 20-25 ms

• air bag begins to inflate

• 5-10 ms

• Airbag inflated

• 25-30 ms

• Seatbelt pre tensioners fire

• 50-70 ms

Bulb components

Groups:

(a) Halogen

,

(b) HID

,

(c) LED

,

(d) Incandescent

• Xenon gas

• • - doped semi-conductor

• Tungsten electrode

• filament

• tungsten filament

• Metal halides

• halogen gas

• vacuum

• 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 a solid

• Radiation

• Heat transfer through waves

• Conduction

• Heat transfer through a liquid

• Convection

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