ENGINE PERFORMANCE EXAM 1
FREQUENTLY TESTED ACTUAL QUESTIONS WITH
CORRECT ANSWERS
Question 1.
All of the following statements are correct EXCEPT ________
Most mufflers have a larger outlet than inlet.
Most mufflers have a larger inlet than outlet.
Resonators resemble small mufflers and are used to further quieten exhaust system noise.
Mufflers catch the high pressure air pulses from the exhaust system.
ANSWER
Most mufflers have a larger outlet than inlet.
Question 2.
To reduce oxides of nitrogen (NOx) exhaust emissions, which camshaft is varied?
ANSWER
Exhaust camshaft only
Question 3.
What does blue exhaust smoke indicate?
ANSWER
burning oil
Question 4.
Which is true of biodiesel fuel?
ANSWER
It is more expensive than petrol diesel
It can be used in standard diesel systems without modification
,Question 5.
The following statements are all correct EXCEPT ________
ANSWER
Torque always results in movement
Question 6.
How are most superchargers lubricated?
ANSWER
By an internal oil reservoir
Question 7.
A good engine should produce how much compression during a running (dynamic) compression test?
ANSWER
60-90 psi
Question 8.
When testing thermostats, technician A uses a pyrometer and says the engine side of the thermostat
should be the hottest spot in the cooling system. Technician B says that incorrect ignition timing may
be the cause of engine overheating. Which technician is correct?
ANSWER
Both techs pyrometer
Question 9.
Exhaust back pressure of an engine running at idle should be ________.
ANSWER
Less than 1.5 PSI
Question 10.
E85 means that the fuel is made from ________.
ANSWER
85% ethanol, 15% gasoline
, Question 11.
All of these are correct EXCEPT ________
ANSWER
Engines produce higher horsepower at higher altitude.
Question 12.
Technician A says that the Helmholtz resonator is used to speed up incoming air into the intake
manifold. Technician B says that the Helmholtz resonator is used to quieten intake noise. Which
technician is correct?
ANSWER
Tech B Helmholtz
Question 13.
The upper portion of a two part intake manifold is often called the ________.
ANSWER
plenum
Question 14.
A flex-fuel vehicle has enhanced fuel system components that include all of these EXCEPT ________.
ANSWER
Low temperature resistant O-rings
Question 15.
How many degrees of CRANKSHAFT rotation are required for a piston to travel from TDC to BDC and
return to TDC?
ANSWER
360
Question 16.
Which valve is used on a factory supercharger to limit boost?
ANSWER
A bypass valve
FREQUENTLY TESTED ACTUAL QUESTIONS WITH
CORRECT ANSWERS
Question 1.
All of the following statements are correct EXCEPT ________
Most mufflers have a larger outlet than inlet.
Most mufflers have a larger inlet than outlet.
Resonators resemble small mufflers and are used to further quieten exhaust system noise.
Mufflers catch the high pressure air pulses from the exhaust system.
ANSWER
Most mufflers have a larger outlet than inlet.
Question 2.
To reduce oxides of nitrogen (NOx) exhaust emissions, which camshaft is varied?
ANSWER
Exhaust camshaft only
Question 3.
What does blue exhaust smoke indicate?
ANSWER
burning oil
Question 4.
Which is true of biodiesel fuel?
ANSWER
It is more expensive than petrol diesel
It can be used in standard diesel systems without modification
,Question 5.
The following statements are all correct EXCEPT ________
ANSWER
Torque always results in movement
Question 6.
How are most superchargers lubricated?
ANSWER
By an internal oil reservoir
Question 7.
A good engine should produce how much compression during a running (dynamic) compression test?
ANSWER
60-90 psi
Question 8.
When testing thermostats, technician A uses a pyrometer and says the engine side of the thermostat
should be the hottest spot in the cooling system. Technician B says that incorrect ignition timing may
be the cause of engine overheating. Which technician is correct?
ANSWER
Both techs pyrometer
Question 9.
Exhaust back pressure of an engine running at idle should be ________.
ANSWER
Less than 1.5 PSI
Question 10.
E85 means that the fuel is made from ________.
ANSWER
85% ethanol, 15% gasoline
, Question 11.
All of these are correct EXCEPT ________
ANSWER
Engines produce higher horsepower at higher altitude.
Question 12.
Technician A says that the Helmholtz resonator is used to speed up incoming air into the intake
manifold. Technician B says that the Helmholtz resonator is used to quieten intake noise. Which
technician is correct?
ANSWER
Tech B Helmholtz
Question 13.
The upper portion of a two part intake manifold is often called the ________.
ANSWER
plenum
Question 14.
A flex-fuel vehicle has enhanced fuel system components that include all of these EXCEPT ________.
ANSWER
Low temperature resistant O-rings
Question 15.
How many degrees of CRANKSHAFT rotation are required for a piston to travel from TDC to BDC and
return to TDC?
ANSWER
360
Question 16.
Which valve is used on a factory supercharger to limit boost?
ANSWER
A bypass valve
