NL Automotive Service Technician Certification
Exam Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of engine oil in an internal
combustion engine?
a) To increase fuel efficiency
b) To cool the engine only
c) To lubricate and reduce friction between moving parts
d) To clean the fuel injectors
Engine oil reduces friction and wear on engine components while
also helping to dissipate heat.
2. A vehicle’s battery is not holding a charge. What is the most likely
cause?
a) Faulty alternator
b) Corroded battery terminals
c) Old or worn-out battery
d) Dirty fuel filter
Over time, batteries lose their ability to hold a charge due to
chemical degradation.
3. What is the primary function of a catalytic converter?
a) Reduce engine noise
b) Increase fuel economy
c) Reduce harmful emissions
, d) Improve oil circulation
Catalytic converters convert harmful gases like CO and NOx into
less harmful emissions.
4. Which tool is used to measure engine cylinder compression?
a) Torque wrench
b) Multimeter
c) Compression gauge
d) Oil pressure gauge
A compression gauge measures the pressure in the cylinders to
check engine health.
5. Which type of brake system uses hydraulic fluid to operate the
brakes?
a) Mechanical
b) Air brake
c) Hydraulic
d) Electric
Hydraulic brake systems use brake fluid to transfer force from the
pedal to the brake calipers.
6. What is the main purpose of a vehicle’s suspension system?
a) To increase fuel efficiency
b) To absorb shocks and maintain tire contact with the road
c) To improve engine cooling
d) To reduce emissions
Suspension systems improve ride comfort and vehicle handling by
absorbing bumps and maintaining traction.
7. How often should a timing belt typically be replaced?
a) Every 5,000 km
, b) Every 60,000–100,000 km depending on manufacturer
recommendations
c) Only when broken
d) Every oil change
Timing belts degrade over time and can cause severe engine
damage if they fail.
8. What does ABS stand for in automotive systems?
a) Automatic Braking System
b) Active Brake Sensor
c) Anti-lock Braking System
d) Auxiliary Brake Safety
ABS prevents wheel lockup during hard braking, improving control
and safety.
9. Which type of coolant is recommended for most modern vehicles?
a) Water only
b) A mixture of antifreeze and water
c) Diesel fuel
d) Brake fluid
Coolant is a mixture of water and antifreeze to prevent freezing,
overheating, and corrosion.
10. What does a multimeter measure?
a) Only current
b) Only resistance
c) Only voltage
d) Voltage, current, and resistance
Multimeters are versatile tools for electrical diagnostics,
measuring voltage, current, and resistance.
Exam Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of engine oil in an internal
combustion engine?
a) To increase fuel efficiency
b) To cool the engine only
c) To lubricate and reduce friction between moving parts
d) To clean the fuel injectors
Engine oil reduces friction and wear on engine components while
also helping to dissipate heat.
2. A vehicle’s battery is not holding a charge. What is the most likely
cause?
a) Faulty alternator
b) Corroded battery terminals
c) Old or worn-out battery
d) Dirty fuel filter
Over time, batteries lose their ability to hold a charge due to
chemical degradation.
3. What is the primary function of a catalytic converter?
a) Reduce engine noise
b) Increase fuel economy
c) Reduce harmful emissions
, d) Improve oil circulation
Catalytic converters convert harmful gases like CO and NOx into
less harmful emissions.
4. Which tool is used to measure engine cylinder compression?
a) Torque wrench
b) Multimeter
c) Compression gauge
d) Oil pressure gauge
A compression gauge measures the pressure in the cylinders to
check engine health.
5. Which type of brake system uses hydraulic fluid to operate the
brakes?
a) Mechanical
b) Air brake
c) Hydraulic
d) Electric
Hydraulic brake systems use brake fluid to transfer force from the
pedal to the brake calipers.
6. What is the main purpose of a vehicle’s suspension system?
a) To increase fuel efficiency
b) To absorb shocks and maintain tire contact with the road
c) To improve engine cooling
d) To reduce emissions
Suspension systems improve ride comfort and vehicle handling by
absorbing bumps and maintaining traction.
7. How often should a timing belt typically be replaced?
a) Every 5,000 km
, b) Every 60,000–100,000 km depending on manufacturer
recommendations
c) Only when broken
d) Every oil change
Timing belts degrade over time and can cause severe engine
damage if they fail.
8. What does ABS stand for in automotive systems?
a) Automatic Braking System
b) Active Brake Sensor
c) Anti-lock Braking System
d) Auxiliary Brake Safety
ABS prevents wheel lockup during hard braking, improving control
and safety.
9. Which type of coolant is recommended for most modern vehicles?
a) Water only
b) A mixture of antifreeze and water
c) Diesel fuel
d) Brake fluid
Coolant is a mixture of water and antifreeze to prevent freezing,
overheating, and corrosion.
10. What does a multimeter measure?
a) Only current
b) Only resistance
c) Only voltage
d) Voltage, current, and resistance
Multimeters are versatile tools for electrical diagnostics,
measuring voltage, current, and resistance.
