Chapter 25 Turbocharging and Supercharging
Quiz by Matt Lobdell
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- Q1
The term "volumetric efficiency" refers to the ability of an engine to ________.
create heat
create emissions
distribute air evenly
pull in air
30s - Q2
Boost pressure is generally measured in________.
inch Hg
inch H2O
inch pounds
PSI
30s - Q3
Which valve is used on a factory supercharger to limit boost?
An air valve
A wastegate
A bypass valve
A blow-off valve
30s - Q4
How are most superchargers lubricated?
By engine oil under pressure throughlines from the engine
No lubrication is needed because the incoming air cools the supercharger
By greased bearings
By an internal oil reservoir
30s - Q5
How are most turbochargers lubricated?
By an internal oil reservoir
By greased bearings
No lubrication is needed because the incoming air cools the turbocharger
By engine oil under pressure through lines from the engine
30s - Q6
Two technicians are discussing the term "turbo lag." Technician A says that it refers to the delay between when exhaust leaves the cylinder and when it contacts the turbine blades of the turbocharger. Technician B says the term refers to the delay in boost pressure that occurs when the throttle is first opened. Who is right?
Technician A only
Technician B only
Both technicians
Neither technician
30s - Q7
Technician A says that a stuck open wastegate can cause the engine to burn oil. Technician B says that a clogged PCV system can cause the engine to burn oil. Who is right?
Technician A only
Technician B only
Both technicians
Neither technician
30s - Q8
What service operations is most important on engines equipped with a turbocharger?
Replacing the fuel filter regularly
Replacing the air filter regularly
Regular oil changes
Regular exhaust system maintenance
30s - Q9
What is the purpose of an intercooler?
To cool the turbocharger
To reduce the temperature of the air entering engine
To cool the engine oil on a turbo charged engine
To cool the exhaust before it enters the turbocharger
30s - Q10
Nitrous oxide injection adds ________allowing the engine to burn more fuel.
HC
CO2
NOx
oxygen
30s - Q11
Technician A says that volumetric efficiency is a comparison of the actual volume of air-fuel mixture drawn into the engine to the theoretical minimum volume that can be drawn into the cylinder. Technician B says that a supercharger consumes some engine power as it forces a greater amount of air into the cylinders for more power. Who is right?
Technician A only
Technician B only
Both technicians
Neither technician
30s - Q12
All of these are advantages of supercharging an engine, EXCEPT ________.
increases the air-fuel charge density
pumped air pushes the remaining exhaust from the combustion
allows the engine to run on lower pressures
lowers the temperature of the cylinder head, pistons, and valves
30s - Q13
Two types of superchargers include________.
roots-type and centrifugal
turbine and piston
double and single acting
rotary and reciprocating
30s - Q14
Technician A says that a turbocharger uses the normally wasted heat energy of the exhaust to turn an impeller at highspeed. Technician B says that there is only one type of supercharger, the roots-type. Who is right?
Technician A only
Technician B only
Both technicians
Neither technician
30s - Q15
Which type of relief valve used on a turbocharged engine is noisy?
Bypass valve
Blow Off Valve (BOV)
Dump valve
Both B and C
30s