Neco auto mechanic past questions and answers
20 auto mechanic questions:
What could cause a steering wheel to shake at certain speeds?
A) Uneven tire wear
B) Low brake fluid
C) Dirty air filter
Answer: A) Uneven tire wear
Which component is responsible for controlling the air-fuel mixture in the engine?
A) Fuel injector
B) Carburetor
C) Oxygen sensor
Answer: A) Fuel injector
What is the purpose of the serpentine belt in a vehicle?
A) Transferring power to the wheels
B) Driving the water pump, alternator, etc.
C) Regulating fuel flow
Answer: B) Driving the water pump, alternator, etc.
What might be the issue if the car's transmission slips while driving?
A) Low engine oil
B) Worn-out clutch
C) Dirty air filter
Answer: B) Worn-out clutch
Which system prevents the engine from starting unless the clutch pedal is pressed (in manual transmission cars)?
A) ECU (Engine Control Unit)
B) ABS (Anti-lock Braking System)
C) Clutch Interlock System
Answer: C) Clutch Interlock System
What can cause a rattling noise underneath the car?
A) Loose exhaust system components
B) Overfilled engine oil
C) Faulty air conditioning compressor
Answer: A) Loose exhaust system components
What is the purpose of the differential in a vehicle?
A) Regulates engine temperature
B) Transmits power to the wheels
C) Filters engine oil
Answer: B) Transmits power to the wheels
What might cause the steering to feel stiff or hard to turn?
A) Low power steering fluid
B) Worn-out brake pads
C) Dirty air filter
Answer: A) Low power steering fluid
Which component assists the starter motor in starting the engine?
A) Spark plug
B) Ignition coil
C) Starter solenoid
Answer: C) Starter solenoid
What does the term "compression ratio" refer to in an engine?
A) Ratio of air to fuel in the combustion chamber
B) Ratio of the piston's highest and lowest positions
C) Ratio of the cylinder volume at its largest and smallest capacities
Answer: C) Ratio of the cylinder volume at its largest and smallest capacities
What might cause the car to jerk or hesitate during acceleration?
A) Low tire pressure
B) Dirty fuel injectors
C) Overfilled engine oil
Answer: B) Dirty fuel injectors
Which part of the exhaust system reduces harmful emissions?
A) Tailpipe
B) Oxygen sensor
C) Catalytic converter
Answer: C) Catalytic converter
What could be the cause if the car's air conditioning blows warm air?
A) Low refrigerant level
B) Clogged air filter
C) Faulty spark plugs
Answer: A) Low refrigerant level
Which system helps maintain a consistent engine temperature?
A) Radiator
B) Exhaust system
C) Fuel injection system
Answer: A) Radiator
What might cause a clicking noise when turning the steering wheel?
A) Low power steering fluid
B) Worn-out brake pads
C) Loose wheel bearings
Answer: C) Loose wheel bearings
What could cause the car to have poor fuel efficiency?
A) Low tire pressure
B) Dirty air filter
C) Faulty oxygen sensor
Answer: C) Faulty oxygen sensor
What might be the issue if the car stalls frequently when idling?
A) Low engine oil
B) Dirty fuel filter
C) Overfilled transmission fluid
Answer: B) Dirty fuel filter
Which system helps reduce engine noise and vibrations?
A) Fuel injection system
B) Exhaust system
C) Ignition system
Answer: B) Exhaust system
What might cause the car to experience a loss of power while driving?
A) Overinflated tires
B) Clogged air filter
C) Faulty fuel pump
Answer: C) Faulty fuel pump
Which part is responsible for controlling the timing of the engine's valves in some modern engines?
A) Timing belt
B) Variable valve timing (VVT) system
C) Camshaft position sensor
Answer: B) Variable valve timing (VVT) system
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