WorksheetsLv3 electrical 457
Total questions: 30
Worksheet time: 15mins
Which is the normal number of volts a lead acid battery cell produce?
1.80
2.10
2.99
3.30
An ammeter cannot be connected in parallel across a battery because
The lead colours don’t match
It has a high resistance
The resistance will be too high and an incorrect reading may occur
The resistance will be too low and cause meter fuse to blow
The main reason for fitting a relay or solenoid to an electrical circuit connected to a heavy load is to
Provide an audible warning that a circuit is operating
Provide a suitable mounting for heavy items
Contain a larger fuse than normal
Allow a low current to operate a high current circuit
When receiving a digital signal which one of the following will an ECU do first?
Initiate a functional test
Rectify data errors
Check the address
Send a reply
When working on a hybrid vehicle engine, you must do what first?
Remove the key and leave in the vehicle
Remove the key and leave in your pocket
Remove the key and leave it at a out of signal distance
Leave the ignition on with battery on charge
What does an oscilloscope measure?
Amps & Volts
Time & Volts
Ohms & Time
Resistance & Amps
The oscilloscope pattern opposite shows:
A. A lambda sensor
B. An injector
C. A knock sensor
D. A temperature sensor
A magnet which rotates within a coil wire will induce which of the following?
Direct current
Alternating current
Fixed current
Oscillating current
Which of the following is the correct definition of the term ohms?
A. A measurement of power
B. A measurement of resistance
C. A measurement of current
D. A measurement of voltage
A broken third brush in a wiper would cause no
Wash wipe function
Self parking facility
Intermittent operation
Two speed operation
Which one of the following will happen if a fault occurs with any input device feeding an ECU
A) A warning light comes on and vehicle stops
B) All vehicles have a second input device that is automatically switched on
C) The ECU uses a limp home mode settings and continues working
D) A warning light comes on and the operator has to type in an override code
When testing a thermister with an ohm meter you must
Test with engine running
Disconnect the plug remove sensor & test the sensor across terminals
Back probe the wires
Connect ohm meter between engine earth & 1 terminal of sensor
Which one of the following is the correct procedure to follow when selecting a diagnostic method
Always use a fault code reader
Ask the customer which diagnostic tool they require
Measure as many scope patterns as possible
Make a selection based on facts stated by the customer
GPS systems use satellites to triangulate their position. What are the minimum satellites required to do this
2
3
4
5
What does GPS stand for?
Grand Positioning System
Ground Positioning System
Global Positioning System
Global Positioned Satellite
What does SG stand for in relation to battery's?
Standard Gravity
Specific Gravity
Special Grade
Sealed Glands
What should a 40ah battery be charged at to maintain a safe charge for the battery?
40amps
4amp
12amps
8amps
In the image shown is the headlight beam pattern
Incorrect
To high
Correct
To low
What hydrometer reading would you expect on a fully charged battery?
1000-1100
1150-1250
1250-1280
1350-1450
How are dedicated fault code readers connected to the vehicle?
CAN-BUS connector.
Sensor wire.
Serial link.
Auxiliary socket.
When removing an air bag from a vehicle it is necessary to wait several minutes after disconnecting the battery to allow the
Static electricity to drain
Capacitors to discharge
Impact sensors to switch off
Deceleration sensors to switch off.
What is the power consumed by a solenoid when the voltage supplied is 15 volts and the current flow is 5 amps?
3 watts.
5 watts.
75 watts.
15 watts.
Which one of the following components can be found in an alternator?
Relay.
Fuse.
Rectifier.
Light-emitting diode.
Which of the following DIN numbers would indicate a permanent live on a wiring diagram?
30
15
31
10
At what point is there most often an excessive volt drop?
Inside a live insulated wire.
A wire connected to a body earthing point.
A clean battery terminal coated with Vaseline petroleum jelly.
Clean copper contacts on a soldered wrap joint.
Why must a hybrid vehicle incorporate a DC to DC convertor?
To enable regeneration to take place.
To maintain a constant voltage.
To change low voltage to high voltage.
To reduce high voltage to low voltage.
What is the purpose of the ballast unit on a Bi-xenon headlamp system?
To decrease the battery voltage within the lamp units.
To support the active cornering lamp.
To support the active cornering lamp.
To increase the voltage and create a spark within the gas lamp.
As the distance between the rotor and inductor on a speed sensor increases, what happens to the voltage?
It increases.
It decreases.
A square wave is created.
A constant 12 volts DC would be created.
What component would a fuel tank sender unit incorporate?
Thermistor
Inductive sensor.
Variable resistor.
Hall effect sensor.
Which of the following components controls the flow of refrigerant in a vehicle’s air conditioning system?
Condenser.
Evaporator.
Thermostatic expansion valve.
Compressor.
