South Carolina Automotive Service
Technician License Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. Which of the following is the primary purpose of an engine’s
crankshaft position sensor?
A. To measure oil pressure
B. To monitor crankshaft speed and position
C. To regulate engine coolant temperature
D. To control fuel injector timing
The crankshaft position sensor monitors the crankshaft’s rotational
speed and position, allowing the engine control module to properly
time ignition and fuel injection.
2. What tool is best used to check the voltage of an automotive battery?
A. Torque wrench
B. Compression tester
C. Digital multimeter
D. Vacuum gauge
A digital multimeter accurately measures battery voltage and helps
assess battery health.
3. What does a rich air–fuel mixture indicate?
A. Too much air, not enough fuel
B. Too much fuel, not enough air
C. Balanced fuel and air
D. Lean engine idle
, A rich mixture contains excess fuel relative to air, which can lead to
incomplete combustion and emissions issues.
4. The torque specification for a cylinder head bolt must be followed to
avoid:
A. Low oil pressure
B. High coolant temperature
C. Warped head or improper sealing
D. Excessive fuel consumption
Cylinder head bolts require specific torque to ensure a proper seal
and prevent warping or gasket failure.
5. Which brake system component stores hydraulic pressure when the
ABS is inactive?
A. Brake caliper
B. Wheel cylinder
C. Accumulator
D. Master cylinder reservoir
The accumulator stores hydraulic pressure for ABS operation when
the system is off duty.
6. What is the function of a catalytic converter?
A. Increase engine horsepower
B. Cool exhaust gasses
C. Reduce harmful emissions
D. Filter engine oil
A catalytic converter chemically converts harmful exhaust emissions
into less harmful substances.
7. Coolant temperature that is too high can be caused by a:
A. Broken serpentine belt only
B. Faulty thermostat
C. Faulty oxygen sensor
D. Dirty air filter
A malfunctioning thermostat can prevent coolant flow, leading to
engine overheating.
8. Which part of the suspension system absorbs road shock and
maintains tire contact?
A. Control arm
, B. Shock absorber/strut
C. Tie rod
D. Sway bar link
Shock absorbers and struts dampen suspension movement,
maintaining tire contact with the road.
9. What is the purpose of wheel alignment?
A. Improve brake fluid flow
B. Adjust tire air pressure
C. Ensure proper tire contact and vehicle handling
D. Clean brake pads
Proper alignment ensures correct tire contact, handling and even tire
wear.
10. A customer complains of a clicking noise when turning. The most
likely cause is a:
A. Bad wheel bearing
B. Worn CV joint
C. Faulty starter motor
D. Loose alternator belt
A worn CV joint commonly produces clicking noises during turns.
11. What is the correct spark plug gap used to ensure optimal
combustion?
A. Too wide causes pre-ignition
B. Specified gap matches engine design
C. No gap increases fuel economy
D. Random gap suffices
Correct spark plug gap per manufacturer ensures efficient
combustion and engine performance.
12. Hydraulic fluid in an automatic transmission primarily transmits:
A. Brake pressure
B. Fuel pressure
C. Power and lubrication
D. Coolant flow
Transmission fluid transmits hydraulic power and provides
lubrication to internal components.
Technician License Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. Which of the following is the primary purpose of an engine’s
crankshaft position sensor?
A. To measure oil pressure
B. To monitor crankshaft speed and position
C. To regulate engine coolant temperature
D. To control fuel injector timing
The crankshaft position sensor monitors the crankshaft’s rotational
speed and position, allowing the engine control module to properly
time ignition and fuel injection.
2. What tool is best used to check the voltage of an automotive battery?
A. Torque wrench
B. Compression tester
C. Digital multimeter
D. Vacuum gauge
A digital multimeter accurately measures battery voltage and helps
assess battery health.
3. What does a rich air–fuel mixture indicate?
A. Too much air, not enough fuel
B. Too much fuel, not enough air
C. Balanced fuel and air
D. Lean engine idle
, A rich mixture contains excess fuel relative to air, which can lead to
incomplete combustion and emissions issues.
4. The torque specification for a cylinder head bolt must be followed to
avoid:
A. Low oil pressure
B. High coolant temperature
C. Warped head or improper sealing
D. Excessive fuel consumption
Cylinder head bolts require specific torque to ensure a proper seal
and prevent warping or gasket failure.
5. Which brake system component stores hydraulic pressure when the
ABS is inactive?
A. Brake caliper
B. Wheel cylinder
C. Accumulator
D. Master cylinder reservoir
The accumulator stores hydraulic pressure for ABS operation when
the system is off duty.
6. What is the function of a catalytic converter?
A. Increase engine horsepower
B. Cool exhaust gasses
C. Reduce harmful emissions
D. Filter engine oil
A catalytic converter chemically converts harmful exhaust emissions
into less harmful substances.
7. Coolant temperature that is too high can be caused by a:
A. Broken serpentine belt only
B. Faulty thermostat
C. Faulty oxygen sensor
D. Dirty air filter
A malfunctioning thermostat can prevent coolant flow, leading to
engine overheating.
8. Which part of the suspension system absorbs road shock and
maintains tire contact?
A. Control arm
, B. Shock absorber/strut
C. Tie rod
D. Sway bar link
Shock absorbers and struts dampen suspension movement,
maintaining tire contact with the road.
9. What is the purpose of wheel alignment?
A. Improve brake fluid flow
B. Adjust tire air pressure
C. Ensure proper tire contact and vehicle handling
D. Clean brake pads
Proper alignment ensures correct tire contact, handling and even tire
wear.
10. A customer complains of a clicking noise when turning. The most
likely cause is a:
A. Bad wheel bearing
B. Worn CV joint
C. Faulty starter motor
D. Loose alternator belt
A worn CV joint commonly produces clicking noises during turns.
11. What is the correct spark plug gap used to ensure optimal
combustion?
A. Too wide causes pre-ignition
B. Specified gap matches engine design
C. No gap increases fuel economy
D. Random gap suffices
Correct spark plug gap per manufacturer ensures efficient
combustion and engine performance.
12. Hydraulic fluid in an automatic transmission primarily transmits:
A. Brake pressure
B. Fuel pressure
C. Power and lubrication
D. Coolant flow
Transmission fluid transmits hydraulic power and provides
lubrication to internal components.
