WorksheetsAutomotive Electrical Quiz: Questions 1-25
Total questions: 40
Worksheet time: 20mins
What is the primary role of a vehicle's alternator?
Store electrical energy
Control ignition timing
Generate electrical power and charge the battery
Regulate coolant flow
Which component prevents excessive current flow in a circuit?
Capacitor
Relay
Fuse
Switch
What does a relay do in an automotive circuit?
Converts AC to DC
Stores electrical energy
Controls a high-current circuit using a low-current signal
Measures voltage
Which sensor monitors the amount of oxygen in exhaust gases?
Knock sensor
MAP sensor
Oxygen sensor
TPS sensor
What is the standard voltage for most car batteries?
6 volts
12 volts
24 volts
48 volts
What does ECU stand for?
Engine Control Utility
Electrical Circuit Unit
Electronic Control Unit
Energy Control Unit
What does ABS stand for?
Automatic Brake System
Anti-lock Braking System
Advanced Brake Setup
Active Brake Sensor
Which device converts AC to DC in a vehicle?
Alternator
Rectifier
Inverter
Transistor
What is the main function of the starter motor?
Charge the battery
Crank the engine for starting
Cool the engine
Lubricate the engine
What is the function of a diode in a circuit?
Stores energy
Allows current to flow in one direction
Amplifies signals
Measures voltage
What does a wiring diagram show?
Mechanical parts
Electrical connections and components
Fluid flow
Torque specifications
Which unit measures electrical resistance?
Volt
Ampere
Watt
Ohm
What does CAN bus stand for?
Central Automotive Node
Car Access Network
Controller Area Network
Circuit Analysis Network
Which sensor detects engine knocking?
Knock sensor
Oxygen sensor
MAP sensor
TPS sensor
What is the purpose of a voltage regulator?
Maintain constant voltage output
Increase current flow
Reduce resistance
Store electrical energy
What is the main purpose of a fuse box in a car?
To store electrical energy
To distribute and protect circuits
To regulate fuel pressure
To cool the alternator
A vehicle shows the battery warning light while driving but starts normally. Based on the items in this quiz, which component is most likely failing?
Starter motor
Alternator or its rectifier
ECU
Knock sensor
A relay is specified to switch a 30 A fan using a 200 mA control signal. Which description best matches how the relay achieves this?
It converts the control signal from AC to DC to increase current
It uses a low-current coil to actuate contacts that carry high current
It stores charge that is later released to the fan
It measures voltage and scales the output to 30 A
Which battery terminal is usually marked with a plus sign?
Negative
Positive
Ground
Neutral
What does the ignition coil do?
Converts low voltage to high voltage for spark plugs
Stores electrical energy
Measures engine speed
Controls fuel injection
Which system uses high-voltage orange cables?
Hybrid or electric vehicle system
Air conditioning system
Audio system
Lighting system
Which unit measures electrical current?
Volt
Ampere
Ohm
Watt
What does the battery warning light indicate?
Low oil pressure
Charging system fault
Brake system fault
Engine overheating
Which component is used to smooth DC voltage?
Capacitor
Resistor
Diode
Relay
What does the term "short circuit" mean?
A circuit with high resistance
A circuit with unintended low-resistance path
A circuit with no current flow
A circuit with open wires
What is the main function of a resistor?
Limit current flow
Store energy
Convert AC to DC
Measure voltage
Which wire color often indicates high voltage in EVs?
Orange
Red
Black
Blue
What does the term "continuity" mean in electrical testing?
A broken circuit
A complete path for current flow
A short circuit
A high-resistance path
What is the main purpose of a fuse rating?
To indicate voltage
To indicate maximum current before blowing
To indicate resistance
To indicate power
What does the term "earth return system" mean?
The chassis is used as the return path for current
Wires return current to the fuse box
Earth strap connects to the road
Battery negative connects to fuse box only
Which tool measures voltage drop across a component?
Ammeter
Voltmeter
Ohmmeter
Tachometer
When checking a circuit’s power consumption, which calculation is most relevant?
Power in watts equals voltage times current
Power in watts equals current divided by resistance
Power in watts equals voltage divided by resistance
Power in watts equals resistance times current
A diagnostic flow recommends checking voltage drop across a fuse. What unit will that measurement produce?
Volts
Ohms
Amps
Watts
When components are connected in series, which outcome is expected regarding current?
Same current flows through each component
Current divides among paths
Zero current flows by design
Current increases after each component
If a circuit draws 5 A at 12 V, which statement is true about its power usage?
It consumes 60 W of electrical power
It consumes 17 W of electrical power
It consumes 5 W of electrical power
It consumes 12 W of electrical power
Which measurement would you log to verify that a ground connection is effective?
Low voltage drop to the chassis
High resistance across the ground point
High current with the circuit open
Wattage rating of the ground strap
Which quantity remains the same across all components in a series circuit?
Current
Voltage
Power
Resistance
Which quantity remains the same across components connected in parallel on a 12 V bus?
Voltage
Current
Resistance
Power
A reading of 12.6 V on a resting automotive battery represents which unit?
A fully charged battery
A battery on charge
A battery with the engine running
A discharged battery
Which relationship is correctly stated for Ohm’s law relevant to automotive circuits?
V = I × R
P = V × I
I = P × R
R = P × V
