WorksheetsAutomotive Electrical Systems Worksheet (Grade 12)
Total questions: 60
Worksheet time: 40mins
Which of the following is the main function of an automotive battery?
Store mechanical energy
Store electrical energy
Produce alternating current
Regulate voltage
The battery provides current for starting the engine and powering accessories.
True
False
The electrolyte used in a lead-acid battery is ________.
Distilled water
Sulfuric acid
Sodium hydroxide
Ammonia
Which tool is used to measure battery voltage accurately?
Hydrometer
Ammeter
Voltmeter
Ohmmeter
Overcharging a battery may cause electrolyte ________.
Evaporation
Freezing
Solidification
Neutralization
Battery terminals should be cleaned using a wire brush.
True
False
The specific gravity of a fully charged battery is approximately ________.
1.000
1.100
1.265
1.500
A discharged battery may result from a defective alternator.
True
False
The positive battery terminal is usually marked with ________.
Plus (+)
Minus (−)
P
N
What PPE is required when handling batteries to prevent acid burns? ________.
Safety goggles and acid‑resistant gloves
Cotton gloves
Hearing protection
Steel‑toe boots
The ignition system’s primary purpose is to ________.
Ignite the air‑fuel mixture
Lubricate engine parts
Cool the engine
Charge the battery
The spark plug gap affects the strength of the spark produced.
True
False
What is the function of the ignition coil?
Generate AC voltage
Transform low voltage to high voltage
Store fuel mixture
Supply air to the engine
CDI stands for ________.
Capacitor Discharge Ignition
Coil Distributor Interface
Compression Drive Igniter
Circuit Disruption Indicator
A worn‑out spark plug may cause engine misfiring.
True
False
The normal spark plug tip color should be ________.
Oily black
Bright white
Light tan/gray
Green
A spark plug gap is measured using a ________.
Micrometer
Feeler gauge
Torque wrench
Vernier caliper
The ignition timing affects engine performance.
True
False
In a distributorless ignition system, each coil serves ________.
One cylinder
Two cylinders
All cylinders
Three cylinders
The component that triggers the spark in modern ignition systems is the ________.
Carburetor
Crankshaft position sensor
Fuel pump
EGR valve
The purpose of the lighting system is to ________.
Provide illumination and signaling
Increase engine power
Reduce emissions
Store electrical energy
A short circuit in the wiring system can cause a fuse to blow.
True
False
What device protects electrical circuits from overload?
Relay
Fuse
Switch
Diode
Headlights must be properly aimed to avoid glare.
True
False
A relay allows a low current circuit to control a ________.
Low current circuit
High current circuit
Mechanical brake
Coolant flow
Ground wires are usually colored ________.
Red
Black
Green
Yellow
LED bulbs consume less power than halogen bulbs.
True
False
What tool is used to check continuity in wires? ________.
Compression gauge
Multimeter
Tachometer
Hydrometer
A flickering light may indicate a loose (a) .
The part of the lighting circuit that distributes power to various components is the ________.
Carburetor
Fuse box
Muffler
Radiator
The starting system converts electrical energy into (a) .
The starter motor engages the flywheel through a pinion gear.
True
False
What is the function of the solenoid in a starting system?
Store energy
Control current to starter motor
Lubricate gears
Supply air to combustion
A weak battery can cause slow engine cranking.
True
False
The starter drive disengages automatically when the engine (a) .
The pinion gear engages the (a) .
A clicking sound during starting usually indicates a weak (a) .
The ignition switch completes the starting circuit.
True
False
The starter draw test is used to measure (a) .
A loose battery connection may result in a (a) .
The main function of the charging system is to (a) .
The alternator converts mechanical energy into electrical energy.
True
False
What regulates alternator output voltage?
(a)
The alternator is driven by a (a) .
A broken alternator belt can cause battery discharge.
True
False
The rectifier converts AC to DC.
True
False
Overcharging may damage the (a) .
The component that produces current in the alternator is the (a) .
A charging indicator light staying on indicates a (a) .
The alternator output voltage should be between (a) volts.
The engine converts chemical energy from fuel into (a) .
The piston moves inside the cylinder bore.
True
False
What is the function of the crankshaft?
Converts reciprocating motion into rotary motion
Stores pressure
Controls timing
Supplies air-fuel mixture
The cylinder head gasket seals the combustion chamber.
True
False
The camshaft operates the engine’s (a) .
Compression testing determines engine mechanical condition.
True
False
Low compression may be caused by a blown (a) .
The valve clearance is measured using a (a) .
The oil pump circulates (a) .
Overheating may cause engine (a) .
