Chapter 25

Question 1

Engineers calculate the engine air flow requirements using all the factors except

Answer 1

Engine power output.

Question 2

An engine that uses atmospheric pressure for its intake charge is called an.

Answer 2

Naturally aspirated engine.

Question 3

In a supercharged or turbo charged engine the boost pressure is measured inside the

Answer 3

Intake manifold

Question 4

All the following conditions cause the airflow to be directed around a super charger. Except when.

Answer 4

The vehicle is accelerated to attain its maximum speed

Question 5

engine is running at full power, the typical turbo charger rotates at speeds between.

Answer 5

100000 and 150000 rpm.

Question 6

An engine exhaust driven air compressor, the supplies more than a normal amount of air into the intake manifold and boosts, engine torque and power is called.

Answer 6

Turbo charger

Question 7

Which of the following is a similarity between turbochargers and superchargers

Answer 7

both turbochargers and superchargers are designed to provide a pressure greater than atmospheric pressure in the intake manifold.

Question 8

A blank is a bypass valve at the exhaust inlet to a turbine, which allows all the exhaust into the turbine or it can route part of the exhaust past the turbine to the exhaust system.

Answer 8

Wastegate valve.

Question 9

Which of the following gases is typically used for racing or high performance only and is not used from the factory on any vehicle.

Answer 9

Nitrous oxide

Question 10

Phosphorus pentoxide is a good power adder

Answer 10

false

Question 11

Naturally aspirated engines. With throttle plates use atmospheric pressure to push an air fuel mixture into the combustion chamber vacuum.

Answer 11

true

Question 12

it is the ratio of the actual volume of air fuel mixture drawn into an engine to the theoretical maximum volume that can be drawn in.

Answer 12

volumetric efficiency

Question 13

The amount of force in air-fuel charge produces when it is ignited is largely a function of the charge density.

Answer 13

Forced induction

Question 14

Superchargers are engine driven air pump, whereas turbochargers are powered by hot exhaust gases.

Answer 14

True

Question 15

Technician. A stated that a root type supercharger is not a positive displacement pump.

Answer 15

False

Question 16

technician b stated that all of the air that enters a root type supercharger is forced through the unit.

Answer 16

True

Question 17

the delay between an increase in engine speed and the increase in the speed of the turbocharger is called

Answer 17

turbo lag

Question 18

Technician. A stated that the turbocharger response time is directly related to the size of the turbine.

Answer 18

True

Question 19

Technician b stated that the turbocharger response time is independent of the size of the compressor wheels.

Answer 19

False

Question 20

What causes excessive oil consumption in a turbo charger?

Answer 20

Faulty wastegate valve

Question 21

As boost pressure increases combustion blank also increases

Answer 21

Temperature

Question 22

Technician A stated that engine power is increased when nitric oxide is injected into an engine along with gasoline.

Answer 22

True

Question 23

Technician b stated that the addition of nitrous oxide to an engine supplies, the needed oxygen for the extra fuel.

Answer 23

True

Question 24

How are most superchargers lubricated

Answer 24

By an internal oil reservoir.

Question 25

Which valve is used on a factory supercharger to limit boost

Answer 25

Bypass valve

Question 26

How are most turbo chargers lubricated

Answer 26

engine oil under pressure through lines from the engine.

Question 27

Technician a says that turbo lag is the delay when the exhaust leaves the cylinder and when it contacts the turbo blades of the turbocharger.

Answer 27

True

Question 28

Technician b says that turbo lag refers to delay in boost pressure that occurs when the throttle is first opened

Answer 28

true

Question 29

What is the purpose of an inter cooler

Answer 29

To reduce the temperature of the air entering the engine.

Question 30

Which type of relief valve used on a turbo charged engine is noisy.

Answer 30

Bypass valve and dump valve.

Question 31

Technician a says that a stuck open wastegate valve can cause the engine to burn oil.

Answer 31

False

Question 32

Technician b says that a clog PCV system and cause the engine to burn oil.

Answer 32

True

Question 33

A service operation is most important on engines equipped with a turbocharger.

Answer 33

Regular oil changes.