Induction Systems

Question 1

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

Answer 1

The air scoop, the carburetor or fuel control and the intake manifold

Question 2

What could happen if an induction system becomes obstructed?

Answer 2

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 filter

Question 3

How does induction icing affect engine performance?

Answer 3

It causes a reduction in power and possible erratic operation

Question 4

How is induction icing categorized?

Answer 4

As impact ice, fuel evaporation ice and throttle ice

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

Fuel evaporation ice is formed because of a decrease in air temperature caused by the evaporation of fuel after it is introduced into the airstream

Question 7

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

Answer 7

At a lower power setting because the throttle is partly closed, offering a larger surface area for ice accumulation

Question 8

What may be an indication of leaking intake pipes?

Answer 8

The engine runs rough at low rpm

Question 9

What happens to engine power when carburetor heat is applied?

Answer 9

There is a noticeable drop in power

Question 10

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

Answer 10

Detonation

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

Question 13

What is used to power a turbocharger?

Answer 13

Engine exhaust gas directed onto the turbocharger turbine

Question 14

What could result if the waste gate on a turbocharger system does not close fully?

Answer 14

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 15

What function does a turbocharger waste gate perform?

Answer 15

It controls the amount of exhaust gas either into or around the turbocharger, thus controlling the boost pressure of the turbocharger

Question 16

What could cause a turbocharged engine to surge?

Answer 16

There could be a waste gate or controller malfunction

Question 17

What are the most common ways to control a waste gate?

Answer 17

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

Question 18

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 18

The sonic venturi

Question 19

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

Answer 19

It causes the air velocity to decrease with an increase in air pressure

Question 20

Where are bell-mouth inlet ducts typically found?

Answer 20

On helicopter engines

Question 21

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

Answer 21

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 toward the engine and is channeled away from the compressor

Question 22

What are the most common methods used for anti-icing of a turbo engine inlet duct?

Answer 22

Engine bleed air and electric heating elements