ARKANSAS AUTOMOTIVE TECHNICIAN
CERTIFICATION EXAM QUESTIONS WITH
CORRECT ANSWERS AND RATIONALES LATEST
2026-2027 UPDATE
SECTION 1: ENGINE REPAIR (A1) — Questions 1-12
1. A technician is checking for piston ring groove clearance. The
proper technique includes:
A) The old ring and a feeler gauge
B) The new ring and a feeler gauge
C) Only a feeler gauge
D) No feeler gauge is required
Correct Answer: B
Rationale: Piston ring groove clearance is checked using the new ring
that will be installed and a feeler gauge. The ring is inserted into the
groove and the feeler gauge measures the gap between the ring and the
groove land. Using the new ring ensures accurate clearance
measurement for proper installation .
2. A cylinder power balance test is being performed on a vehicle with
sequential fuel injection. The number five cylinder's RPM drop is
less than all of the others. Technician A says this could be the result
of a restriction in the fuel injector. Technician B says this could be
caused by leaking secondary insulation. Who is correct?
,A) Technician A
B) Technician B
C) Both A and B
D) Neither A or B
Correct Answer: C
Rationale: A reduced RPM drop on a power balance test indicates that
cylinder is contributing less power. A restricted fuel injector would
reduce fuel delivery, causing a weak cylinder. Leaking secondary
ignition insulation could cause spark energy to bleed to ground before
reaching the spark plug, also producing a weak cylinder. Both conditions
are valid possibilities .
3. A turbocharger wastegate is sticking. Technician A says a stuck
open wastegate will result in overboost. Technician B says a stuck
closed wastegate will result in an underboost condition. Who is
correct?
A) Technician A
B) Technician B
C) Both A and B
D) Neither A or B
Correct Answer: D
Rationale: The statements are reversed. A stuck open wastegate diverts
exhaust gas away from the turbine, resulting in underboost (low or no
boost pressure). A stuck closed wastegate prevents exhaust gas from
bypassing the turbine, causing overboost (excessive boost pressure).
Neither technician is correct .
,4. Technician A says a supercharger uses an intercooler to keep the
engine's oil cool. Technician B says intercoolers are used on
turbochargers to keep the oil cool. Who is correct?
A) Technician A
B) Technician B
C) Both A and B
D) Neither A or B
Correct Answer: D
Rationale: Intercoolers (charge air coolers) are used on both
supercharged and turbocharged engines, but their purpose is to cool
the intake air charge after compression, not to cool engine oil. Cooling
the intake air increases density, improving combustion efficiency and
power output. Neither technician is correct .
5. A wet compression test is being performed on a four-cylinder
engine. The number two cylinder's compression is below
specifications and remains the same after injecting oil. This result
indicates:
A) Worn piston rings
B) A faulty valve
C) A hole in the piston
D) Excessive carbon buildup on the piston's dome
Correct Answer: B
Rationale: In a wet compression test, adding oil to the cylinder
temporarily seals worn piston rings, causing compression to rise if rings
, are the problem. If compression remains low after adding oil, the
leakage path is through the valves (intake or exhaust), as oil cannot seal
valve-related leakage .
6. A vehicle has blue-colored exhaust. Technician A says this may be
caused by weak piston rings. Technician B says this may be caused
by a leaking fuel injector. Who is correct?
A) Technician A
B) Technician B
C) Both A and B
D) Neither A or B
Correct Answer: A
Rationale: Blue-colored exhaust indicates oil burning in the combustion
chamber. Worn or weak piston rings allow oil to pass from the crankcase
into the combustion chamber. A leaking fuel injector would produce
black exhaust from excessive fuel (rich condition) or possibly no visible
exhaust color change, but not blue oil smoke .
7. Technician A says to remove the ridge on the engine block before
removing the pistons. Technician B says a block's ridge will damage
the new piston rings during installation. Who is correct?
A) Technician A
B) Technician B
C) Both A and B
D) Neither A or B
Correct Answer: C
CERTIFICATION EXAM QUESTIONS WITH
CORRECT ANSWERS AND RATIONALES LATEST
2026-2027 UPDATE
SECTION 1: ENGINE REPAIR (A1) — Questions 1-12
1. A technician is checking for piston ring groove clearance. The
proper technique includes:
A) The old ring and a feeler gauge
B) The new ring and a feeler gauge
C) Only a feeler gauge
D) No feeler gauge is required
Correct Answer: B
Rationale: Piston ring groove clearance is checked using the new ring
that will be installed and a feeler gauge. The ring is inserted into the
groove and the feeler gauge measures the gap between the ring and the
groove land. Using the new ring ensures accurate clearance
measurement for proper installation .
2. A cylinder power balance test is being performed on a vehicle with
sequential fuel injection. The number five cylinder's RPM drop is
less than all of the others. Technician A says this could be the result
of a restriction in the fuel injector. Technician B says this could be
caused by leaking secondary insulation. Who is correct?
,A) Technician A
B) Technician B
C) Both A and B
D) Neither A or B
Correct Answer: C
Rationale: A reduced RPM drop on a power balance test indicates that
cylinder is contributing less power. A restricted fuel injector would
reduce fuel delivery, causing a weak cylinder. Leaking secondary
ignition insulation could cause spark energy to bleed to ground before
reaching the spark plug, also producing a weak cylinder. Both conditions
are valid possibilities .
3. A turbocharger wastegate is sticking. Technician A says a stuck
open wastegate will result in overboost. Technician B says a stuck
closed wastegate will result in an underboost condition. Who is
correct?
A) Technician A
B) Technician B
C) Both A and B
D) Neither A or B
Correct Answer: D
Rationale: The statements are reversed. A stuck open wastegate diverts
exhaust gas away from the turbine, resulting in underboost (low or no
boost pressure). A stuck closed wastegate prevents exhaust gas from
bypassing the turbine, causing overboost (excessive boost pressure).
Neither technician is correct .
,4. Technician A says a supercharger uses an intercooler to keep the
engine's oil cool. Technician B says intercoolers are used on
turbochargers to keep the oil cool. Who is correct?
A) Technician A
B) Technician B
C) Both A and B
D) Neither A or B
Correct Answer: D
Rationale: Intercoolers (charge air coolers) are used on both
supercharged and turbocharged engines, but their purpose is to cool
the intake air charge after compression, not to cool engine oil. Cooling
the intake air increases density, improving combustion efficiency and
power output. Neither technician is correct .
5. A wet compression test is being performed on a four-cylinder
engine. The number two cylinder's compression is below
specifications and remains the same after injecting oil. This result
indicates:
A) Worn piston rings
B) A faulty valve
C) A hole in the piston
D) Excessive carbon buildup on the piston's dome
Correct Answer: B
Rationale: In a wet compression test, adding oil to the cylinder
temporarily seals worn piston rings, causing compression to rise if rings
, are the problem. If compression remains low after adding oil, the
leakage path is through the valves (intake or exhaust), as oil cannot seal
valve-related leakage .
6. A vehicle has blue-colored exhaust. Technician A says this may be
caused by weak piston rings. Technician B says this may be caused
by a leaking fuel injector. Who is correct?
A) Technician A
B) Technician B
C) Both A and B
D) Neither A or B
Correct Answer: A
Rationale: Blue-colored exhaust indicates oil burning in the combustion
chamber. Worn or weak piston rings allow oil to pass from the crankcase
into the combustion chamber. A leaking fuel injector would produce
black exhaust from excessive fuel (rich condition) or possibly no visible
exhaust color change, but not blue oil smoke .
7. Technician A says to remove the ridge on the engine block before
removing the pistons. Technician B says a block's ridge will damage
the new piston rings during installation. Who is correct?
A) Technician A
B) Technician B
C) Both A and B
D) Neither A or B
Correct Answer: C
