ENGINE REPAIR MICHIGAN MECHANIC
STUDY PAPER 2026 FULL SOLUTION
GUIDE GRADED A+
⩥ Vapor lock can occur ________.
as a result of excessive heat near fuel lines.
if a fuel line is restricted.
during both A and B.
during neither A nor B.. Answer: during both A and B.
⩥ Technician A says that spark knock, ping, and detonation are different
names for abnormal combustion. Technician B says that any abnormal
combustion raises the temperature and pressure inside the combustion
chamber and can cause severe engine damage. Which technician is
correct?. Answer: Both technicians
⩥ Technician A says that the research octane number is higher than the
motor octane number. Technician B says that the octane rating posted on
fuel pumps is an average of the two ratings. Which technician is
correct?. Answer: Both technicians
⩥ Technician A says that in going to high altitudes, engines produce
lower power. Technician B says that most engine control systems can
,compensate the air-fuel mixture for changes in altitude. Which
technician is correct?. Answer: Both technicians
⩥ What can be used to measure the alcohol content in gasoline?
Electronic Tester
Graduated cylinder
Scan tool
Either A or B. Answer: Either A or B
⩥ The gasoline burned inside the internal combustion engine is a type of
________.
hydrocarbon
alcohol
carbon monoxide
compressed vapor. Answer: hydrocarbon
⩥ Avoid topping off the fuel tank because ________.
the extra fuel simply spills onto the ground.
the extra fuel goes into the expansion area of the tank and is not used by
the engine.
,it can saturate the charcoal canister.
the extra fuel increases vehicle weight and reduces performance..
Answer: it can saturate the charcoal canister
⩥ Using ethanol-enhanced or reformulated gasoline can result in
________.
the same fuel economy compared to using 100% gasoline.
improved fuel economy compared to using 100% gasoline.
reduced fuel economy compared to using 100% gasoline.
higher or lower fuel economy, depending on the size of the engine..
Answer: reduced fuel economy compared to using 100% gasoline.
⩥ Pump octane is rated by ________.
research octane only
an average of these two methods
motor octane only
None of these. Answer: an average of these two methods
⩥ Ethanol can be produced from what products?
Sugarcane
, Switchgrass
Corn
Any of the above. Answer: Any of the above
⩥ E85 means that the fuel is made from ________.
pure ethyl alcohol
ethanol that has 15% water
85% gasoline, 15% ethanol
85% ethanol, 15% gasoline. Answer: 85% ethanol, 15% gasoline
⩥ A flex-fuel vehicle can be identified by ________.
VIN
VECI
emblems on the side, front, and/or rear of the vehicle
Any of the above. Answer: Any of the above
⩥ Which alcohol is dangerous (toxic)?
Ethanol
Neither ethanol nor methanol
STUDY PAPER 2026 FULL SOLUTION
GUIDE GRADED A+
⩥ Vapor lock can occur ________.
as a result of excessive heat near fuel lines.
if a fuel line is restricted.
during both A and B.
during neither A nor B.. Answer: during both A and B.
⩥ Technician A says that spark knock, ping, and detonation are different
names for abnormal combustion. Technician B says that any abnormal
combustion raises the temperature and pressure inside the combustion
chamber and can cause severe engine damage. Which technician is
correct?. Answer: Both technicians
⩥ Technician A says that the research octane number is higher than the
motor octane number. Technician B says that the octane rating posted on
fuel pumps is an average of the two ratings. Which technician is
correct?. Answer: Both technicians
⩥ Technician A says that in going to high altitudes, engines produce
lower power. Technician B says that most engine control systems can
,compensate the air-fuel mixture for changes in altitude. Which
technician is correct?. Answer: Both technicians
⩥ What can be used to measure the alcohol content in gasoline?
Electronic Tester
Graduated cylinder
Scan tool
Either A or B. Answer: Either A or B
⩥ The gasoline burned inside the internal combustion engine is a type of
________.
hydrocarbon
alcohol
carbon monoxide
compressed vapor. Answer: hydrocarbon
⩥ Avoid topping off the fuel tank because ________.
the extra fuel simply spills onto the ground.
the extra fuel goes into the expansion area of the tank and is not used by
the engine.
,it can saturate the charcoal canister.
the extra fuel increases vehicle weight and reduces performance..
Answer: it can saturate the charcoal canister
⩥ Using ethanol-enhanced or reformulated gasoline can result in
________.
the same fuel economy compared to using 100% gasoline.
improved fuel economy compared to using 100% gasoline.
reduced fuel economy compared to using 100% gasoline.
higher or lower fuel economy, depending on the size of the engine..
Answer: reduced fuel economy compared to using 100% gasoline.
⩥ Pump octane is rated by ________.
research octane only
an average of these two methods
motor octane only
None of these. Answer: an average of these two methods
⩥ Ethanol can be produced from what products?
Sugarcane
, Switchgrass
Corn
Any of the above. Answer: Any of the above
⩥ E85 means that the fuel is made from ________.
pure ethyl alcohol
ethanol that has 15% water
85% gasoline, 15% ethanol
85% ethanol, 15% gasoline. Answer: 85% ethanol, 15% gasoline
⩥ A flex-fuel vehicle can be identified by ________.
VIN
VECI
emblems on the side, front, and/or rear of the vehicle
Any of the above. Answer: Any of the above
⩥ Which alcohol is dangerous (toxic)?
Ethanol
Neither ethanol nor methanol
