Unit 153 (1) Electrics

Which DIN number represents permanent battery supply?

• 4

• 15

• 30

• 31

Against which of the following does a fuse protect an electrical circuit?

• Short circuit failure

• Open circuit failure

• Excessive resistance

• Very low resistance

Which one of the following is a circuit protection device?

• Fuse

• Transistor

• Potentiometer

• Thermistor

What are thermistors used to provide information on?

• Pressure

• Speed

• Temperature

• Position

A post catalytic converter lambda sensor voltage is rapidly cycling between 200mV and 800mV. What would this indicate?

• Everything is normal

• The vehicle is in open loop

• The catalytic converter has failed

• The vehicle is in closed loop

Before connecting a digital ohmmeter to a circuit, a technician should first

• operate the circuit

• install new batteries

• set the range selector to the highest range

• verify the circuit is electrically isolated

Two identical lamps are connected in parallel to a 12-volt source. What will the voltage across each lamp be?

• 2 volts

• 4 volts

• 6 volts

• 12 volts

What is the component shown in the image below?

• Starter armature

• Starter casing

• Starter solenoid

• Starter pinion drive

Before removing a battery, what should a technician do first?

• Discharge the battery totally

• Disconnect the battery positive lead

• Disconnect the battery negative lead

• Clean both battery posts

What is the main purpose of the overrunning clutch on a starter motor?

• To assist the solenoid during cranking

• To pull the starter pinion gear out of mesh

• To disengage the armature when the engine starts

• To keep the hold-in winding energised during cranking