Electrical Flashcards
(50 cards)
To prevent the engine from driving the starter motor, if the starter switch is not released on starting. What is fitted?
A one way clutch.
The relative density of the electrolyte in a fully charged lead acid battery is approximately what?
1.280
An alternator rectifier is fitted with what?
A number of diodes
Where is the ‘lambda sensor’ usually located?
In the exhaust front pipe
What is a loose or dirty terminal likely to cause?
The engine not to start
When changing a faulty halogen head lamp bulb you must be careful not to what?
Not to touch the bulbs glass
After driving a diesel engined vehicle into the workshop, you try to turn it off but the engine keeps running a likely fault is?
Faulty fuel cut-off solenoid
The fault shown on the electrical diagram is?
A short circuit
With the meter connected as shown in the illustration, what voltage will the meter display?
6 volts
A loose alternator belt is likely to cause what?
A flat battery
Which of the meters is connected in series with the circuit components to get a reading?
Ammeter
In the circuit below, the pd measured across the 8 ohm resistor will be?
4 volts
A means of providing low current switching for a high current starter motor circuit is by the use of?
A solenoid
If you were to connect the leads of an ammeter directly to the positive and negative terminals of a battery, what you happen?
You would seriously damage the meter
The diagram shows two resistors in a circuit, the resistors are connected in?
Series
If a customer complains of the need to frequently replace bulbs and the lights are very bright, the likely fault is?
A defective voltage regulator
The diagram shows part of a lighting circuit. If the side beam and rear lamps and main beam lamps operate, but the dip beam lamps fail to operate, the likely cause is?
The dip switch is faulty
What will a high resistance in the battery earth lead connection cause the earth lead to do?
Get hot when starting the engine
By connecting a voltmeter across the battery terminals and observing the reading whilst cranking over the starter motor you can?
Calculate the volt drop
Before testing an electric component for the first time you should always what?
Check the test procedure in the workshop manual
The diagram shows part of a lighting circuit. What is the effect if the earth connection to the component labelled ‘A’ is broken?
The side and rear lamps operate normally but the dip and main beam lamps fail to operate
The unit of electrical power is?
Watt
A bad earth connection on a rear lamp may cause the light to?
Go dim
In a 12 volt lighting circuit 4 lamps are connected in parallel, each lamp is rated at 6 watt. The current used by this circuit is?
2 amp
