AUTOMOTIVE ENGINES
DIAGNOSIS & REPAIR REVIEWED
QUESTIONS AND THEIR EXPECTED
ANSWERS
The technician says that on a pressure-fed oil system,
oil is fed to the different bearings by way of:
oil galleries
When performing vacuum testing, Technician A says
the vacuum reading at idle will be higher on an engine
with a high-performance camshaft than a normal
engine. Technician B says that the gauge readings for
a normal engine will be higher at high altitudes than at
sea level. Who is correct?
Neither Technician A nor Technician B
Too much oil in the engine:
can cause engine oil foaming.
Technician A says that a dry sump system uses no oil
storage sump under the engine. Technician B says
that a wet sump system uses no oil storage sump
under the engine. Who is correct?
Technician A
The percentage at which a cylinder is filled with air
when it is running is known as:
volumetric efficiency
Technician A says that detergents keep oil from
forming wax deposits under cold temperatures.
, Technician B says that dispersants reduce carbon
deposits on parts such as piston rings and valves.
Who is correct?
Both Technician A and Technician B
Technician A says that in a performance engine, large
valve overlap and lift increase high-end rpm.
Technician B says that low-end power is sacrificed as
a result of large valve overlap. Who is correct?
Both Technician A and Technician B
An oil pump that is capable of delivering a larger
amount of oil than a stock oil pump is called a:
high-volume pump
Technician A says that if valve clearance is too small,
the valve will make a ticking noise. Technician B says
that if valve clearance is too large, the valves will be
held open for too long. Who is correct?
**If valve clearance is too large, the valves will tick and
make enough noise to irritate the operator and increase
wear of the valve train. If valve clearance is too small, the
valve can be held open longer than it should be. As the
cylinder head and valve train parts heat, they expand, so
adequate clearance is needed to allow for this expansion.
Insufficient valve clearance could result in burned valves.
Technician A says that a stuck-open heater control
valve will prevent the heating of the passenger
compartment. Technician B says that a stuck-closed
control valve will normally cause an engine
overheating condition. Who is correct?
**A stuck-open heater control valve will not prevent
heating in the passenger compartment. A stuck-closed
heater control valve will prevent heating in passenger
DIAGNOSIS & REPAIR REVIEWED
QUESTIONS AND THEIR EXPECTED
ANSWERS
The technician says that on a pressure-fed oil system,
oil is fed to the different bearings by way of:
oil galleries
When performing vacuum testing, Technician A says
the vacuum reading at idle will be higher on an engine
with a high-performance camshaft than a normal
engine. Technician B says that the gauge readings for
a normal engine will be higher at high altitudes than at
sea level. Who is correct?
Neither Technician A nor Technician B
Too much oil in the engine:
can cause engine oil foaming.
Technician A says that a dry sump system uses no oil
storage sump under the engine. Technician B says
that a wet sump system uses no oil storage sump
under the engine. Who is correct?
Technician A
The percentage at which a cylinder is filled with air
when it is running is known as:
volumetric efficiency
Technician A says that detergents keep oil from
forming wax deposits under cold temperatures.
, Technician B says that dispersants reduce carbon
deposits on parts such as piston rings and valves.
Who is correct?
Both Technician A and Technician B
Technician A says that in a performance engine, large
valve overlap and lift increase high-end rpm.
Technician B says that low-end power is sacrificed as
a result of large valve overlap. Who is correct?
Both Technician A and Technician B
An oil pump that is capable of delivering a larger
amount of oil than a stock oil pump is called a:
high-volume pump
Technician A says that if valve clearance is too small,
the valve will make a ticking noise. Technician B says
that if valve clearance is too large, the valves will be
held open for too long. Who is correct?
**If valve clearance is too large, the valves will tick and
make enough noise to irritate the operator and increase
wear of the valve train. If valve clearance is too small, the
valve can be held open longer than it should be. As the
cylinder head and valve train parts heat, they expand, so
adequate clearance is needed to allow for this expansion.
Insufficient valve clearance could result in burned valves.
Technician A says that a stuck-open heater control
valve will prevent the heating of the passenger
compartment. Technician B says that a stuck-closed
control valve will normally cause an engine
overheating condition. Who is correct?
**A stuck-open heater control valve will not prevent
heating in the passenger compartment. A stuck-closed
heater control valve will prevent heating in passenger
