Induction Systems

Question 1

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

Answer 1

Air scoop, carburetor and intake manifold.

Question 2

What could happen if the induction system becomes obstructed?

Answer 2

Engine may not produce rated power or may not run at all. May also be an indication of a dirty air filter.

Question 3

How does induction icing affect engine performance?

Answer 3

Causes a reduction in power and possible erratic operation.

Question 4

How is induction icing categorized?

Answer 4

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 temperature of induction air with a preheater.

Question 6

What causes fuel evaporation ice?

Answer 6

Formed by decrease in air temperature due to evaporation of fuel after 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

Lower power setting, throttle is partly closed and has larger surface area for ice accumulation.

Question 8

What may be the indication of a leaking intake pipe?

Answer 8

Engine runs rough at low RPM.

Question 9

What happens to engine power when the carburetor heat is applied?

Answer 9

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 and externally driven.

Question 12

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

Answer 12

Impeller compresses the fuel air mixture after it leaves the carburetor.

Question 13

What is used to power a turbocharger?

Answer 13

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

Engine may not produce rated power at certain altitudes and the aircraft may not be capable of reaching critical altitude.

Question 15

What function does a turbocharger wastegate perform?

Answer 15

Controls amount of exhaust gas into or around turbocharger thus controlling the boost pressure of the turbocharger.

Question 16

What could cause a turbocharged engine to surge?

Answer 16

Waste gate or controller malfunction.

Question 17

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

Answer 17

Mechanical linkages or by actuator 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

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 a subsequent increase in air pressure.

Question 20

Where are bell-mouth inlet ducts typically found?

Answer 20

Helicopter engines.

Question 21

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

Answer 21

Venturi accelerates flow of incoming air and debris through curved intake, debris gain too much inertia to follow curved intake toward engine, is channeled away from compressor.

Question 22

What are the most common methods used for anti-icing of a turbine?

Answer 22

Inlet ducts, bleed air and electric heating elements.