Induction And Airflow Systems

Question 1

What happen to engine power when the carburator heat is applied?

Answer 1

There is a noticeable drop in power.

Question 2

What could happen if carburator 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

The air scoop, carburator or 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 its rated power or it may not run at all. This may also be an indication of a dirty air inlet filter.

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 preheater.

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 air stream.

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 carburator throttle ice more likely to occur at a higher or lower power setting? Why?

Answer 9

LOWER – The throttle is partly closed offering 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 leaves the carburator.

Question 13

From where does an externally driven supercharger derive its power.

Answer 13

From the energy of engine exhaust gases directed against some form of turbine.

Question 14

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

Answer 14

An (engine-driven) impeller compresses the fuel/air mixture after it leaves the carburator.

Question 15

What is used to power turbocharger?

Answer 15

Engine exhaust gas directed into the turbocharger turbine.

Question 16

What is the function of a turbocharger waste gate?

Answer 16

It controls the VOLUME of exhaust gas that is directed onto the turbine.

Question 17

What could result if the waste gate on a turbocharger 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 turbochargerd 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 waste gate 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 many turbocharged engines for waste gate actuator power?

Answer 20

Oil pressure.

Question 21

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

Answer 21

The sonic venturi.

Question 22

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

Answer 22

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

Question 23

Where are bellmounth inlet ducts typically found? (Key word bell)

Answer 23

On helicopter engines.

Question 24

What is the function of a sonic venturi in a turbocharger system?

Answer 24

To limit the amount of turbocharger airflow used for cabin pressurization.

Question 25

How do venturi-type particle separators, found on many turbine powered helicopters function?

Answer 25

A venturi is used to accelerate the flow of incoming air and debris through a curved intake. The debris gains too much inertia to allow it to follow the curved intake towards the engine and is channeled 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 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

(1) Enginebleedair,(2)ElectricHeatingelements.

Question 30

When is carburator 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.