Induction and Engine Airflow Systems

Question 1

What happens to engine power when the carburetor heat is applied

Answer 1

There is a noticeable drop in power

Question 2

What could happen if carburetor heat is applied at high engine power settings?

Answer 2

Detonation

Question 3

Name the three components on the induction system of a reciprocating engine

Answer 3

air scoop, fuel control, and intake manifold

Question 4

What could happen if the induction system becomes obstructed?

Answer 4

The engine may not be able to produce it’s rated power or may not run at all

Question 5

What is the common method used to prevent induction system ice in a reciprocating engine?

Answer 5

Raise the temperature of induction air with a pre-heater

Question 6

What causes fuel evaporation ice?

Answer 6

It is because of the decrease in air temperature resulting from evaporation of the fuel, after it is introduced into the airstream

Question 7

How does induction icing affect engine performance?

Answer 7

It causes a reduction in power and possible erratic operation

Question 8

How is induction icing categorized?

Answer 8

As impact ice, fuel evaporation ice, and throttle ice

Question 9

Is carburetor, throttle ice, more likely to occur at a higher or lower power setting?

Answer 9

Lower - because the throttle is partly close offer in a larger surface area for ice accumulation

Question 10

What may be the indication of leaking intake pipes?

Answer 10

The engine runs rough at low rpm

Question 11

What are two types of supercharged induction systems?

Answer 11

Internally driven and externally driven

Question 12

How and at what point does an internally driven supercharger boost air pressure?

Answer 12

An impeller compresses the fuel air mixture after leaving the carburetor

Question 13

From where does an externally driven supercharger derive its power?

Answer 13

From the energy of engine exhaust gases, directed against some of the turbine

Question 14

How and at what point does an internally driven supercharger, boost air pressure?

Answer 14

An engine driven impeller compresses fuel air mixture after it leaves the carburetor

Question 15

What is used to power a turbo charger?

Answer 15

Engine exhaust gas directed into the turbo charger turbine

Question 16

What is the function of a turbo charger wastegate?

Answer 16

It controls the volume of exhaust gas that is directed into the turbine

Question 17

What could result if the wastegate on a turbo charger system does not close fully?

Answer 17

The engine may not be able to produce its rated power at certain altitudes, and the aircraft may not be capable of reaching critical altitude

Question 18

What could cause a turbo charged engine to surge?

Answer 18

There could be a waste gate or controller malfunction

Question 19

What are the most common ways to control a wastegate actuator power?

Answer 19

Either mechanically with linkages to the throttle, or a separate control, or by an actuator that is driven by oil pressure

Question 20

What is used on turbocharged engines for wastegate actuator power?

Answer 20

Oil pressure

Question 21

In a pressurized reciprocating aircraft, what component in the turbo charger system is used to limit the amount of turbo charger airflow use for cabin pressurization

Answer 21

The sonic Venturi

Question 22

What is the function of a divergent shape jet engine inlet during subsonic flight?

Answer 22

He causes the air velocity to decrease with a subsequent increase in air pressure

Question 23

Where are bellmouth Inlet ducts typically found?

Answer 23

Helicopter engines

Question 24

What is the function of a sonic Venturi in a turbo charger system?

Answer 24

To limit the amount of turbo charger airflow used for cabin pressurization

Question 25

How do Venturi type particle separator’s found on many turbine power helicopters function

Answer 25

A Venturi is used to accelerate the flow of incoming air and debris through a curved intake. Debris gains too much inertia to allow it to follow the curved intake towards the engine and its channel away from the compressor.

Question 26

The Venturi type particle separator found on many turbine powered helicopters utilizes what characteristic of matter to help remove debris from the induction air?

Answer 26

Inertia

Question 27

What are the most common methods used for anti-icing of turbine engine inlet ducts?

Answer 27

Engine bleed air and electric heating elements

Question 28

What is an indication of a dirty air inlet filter?

Answer 28

Loss of power

Question 29

Name two methods used for anti-icing of turbine engine inlet ducts

Answer 29

Engine bleed air and electrical heating elements

Question 30

When is carburetor throttle ice most likely to form due to throttle position?

Answer 30

During part throttle operation when the throttle is in a partly closed position