Deck 25: Turbocharging and Supercharging

Question 1

Boost pressure is generally measured in ________.

A)Inches of water (in. H₂O)
B)Inches of mercury (in. Hg)
C)Pounds per square inch (PSI)
D)Inch pounds

Answer 1

Pounds per square inch (PSI)

Question 2

Two types of superchargers include ________.

A)Double and single acting
B)Turbine and piston
C)Rotary and reciprocating
D)Roots-type and centrifugal

Answer 2

Roots-type and centrifugal

Question 3

Which valve is used on a factory supercharger to limit boost?

A)A bypass valve
B)A wastegate
C)An air valve
D)A blow-off valve

Answer 3

A bypass valve

Question 4

How are most superchargers lubricated?

A)By greased bearings
B)By an internal oil reservoir
C)By engine oil under pressure through lines from the engine
D)No lubrication is needed because the incoming air cools the supercharger

Question 5

How are most turbochargers lubricated?

A)By an internal oil reservoir
B)No lubrication is needed because the incoming air cools the turbocharger
C)By engine oil under pressure through lines from the engine
D)By greased bearings

Question 6

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?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 7

What is the purpose of an intercooler?

A)To cool the exhaust before it enters the turbocharger
B)To reduce the temperature of the air entering engine
C)To cool the turbocharger
D)To cool the engine oil on a turbocharged engine

Question 8

Which type of relief valve used on a turbocharged engine is noisy?

A)Bypass valve
B)Blow Off Valve (BOV)
C)Dump valve
D)Both B and C

Question 9

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?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 10

What service operations is most important on engines equipped with a turbocharger?

A)Replacing the fuel filter regularly
B)Regular exhaust system maintenance
C)Replacing the Air filter regularly
D)Regular oil changes

Question 11

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?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 12

All of these are advantages of supercharging an engine, EXCEPT ________.

A)Allows the engine to run on lower pressures
B)Pumped air pushes the remaining exhaust from the combustion
C)Increases the air-fuel charge density
D)Lowers the temperature of the cylinder head, pistons, and valves

Question 13

Technician A says that a turbocharger uses the normally wasted heat energy of the exhaust to turn an impeller at high speed. Technician B says that there is only one type of supercharger, the roots-type. Who is right?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 14

Technician A says that a bypass valve is used to control the boost pressure on most factory installed superchargers. Technician B says that an intercooler is used on many turbocharged and some supercharged engines to reduce the temperature of air entering the engine for increased power. Who is right?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 15

Technician A says that a wastegate is used on most turbocharger systems to limit and control boost pressures. Technician B says that a relief valve is also used to keep the speed of the turbine wheel from speeding up during engine deceleration. Who is right?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 16

The term "volumetric efficiency" refers to the ability of an engine to ________.

A)Create emissions
B)Pull in air
C)Distribute air evenly
D)Create heat

Question 17

Which of these is defined as the mass or weight of a substance in a given amount of space?

A)Mass
B)Volumetric efficiency
C)Energy
D)Density

Question 18

When air is pumped into the cylinder, the combustion chamber receives an increase of air pressure known as ________ and is measured in pounds per square inch (psi), atmospheres (ATM), or bar.

A)Horsepower
B)Waste
C)Density
D)Boost

Question 19

Many factory installed superchargers are equipped with a ________ that allows intake air to flow directly into the intake manifold bypassing the supercharger.

A)Bypass valve
B)Throttle control valve
C)Control valve
D)Wastegate

Question 20

Nitrous oxide injection adds ________ allowing the engine to burn more fuel.

A)HC
B)Oxygen
C)NOx
D)CO₂

Question 21

An engine designed to use nitrous oxide injection should have which of these features?

A)Forged connecting rods
B)All of these
C)Forged pistons
D)High strength or forged crankshaft

Question 22

Identify this component.

A)Water pump
B)Wastegate
C)Turbocharger
D)Centrifugal supercharger