Jeppesen Chapter 5 - Iduction Systems (22 items)

Question 1

Q1. Name the three components on the induction system of a reciprocating engine.

Answer 1

A1. The air scoop, carburetor or fuel control, and the intake manifold.

Question 2

Q3. How does induction icing affect engine performance?

Answer 2

A3. It causes a reduction in power and possible erratic operation.

Question 3

Q4. How is induction icing categorized?

Answer 3

A4. As impact ice, fuel evaporation ice, and throttle ice.

Question 4

Q5. What is the common method used to prevent induction system ice in a reciprocating engine?

Answer 4

A5. Raise the temperature of induction air with a preheater.

Question 5

Q6. What causes fuel evaporation ice?

Answer 5

A6. Fuel evaporation ice is formed because of the decrease in air temperature resulting from evaporation of the fuel after it is introduced into the air stream.

Question 6

Q7. Is carburetor throttle ice more likely to occur at a higher or lower power setting? Why?

Answer 6

A7. At a low power setting because the throttle is partly closed, offering a larger surface area for ice accumulation.

Question 7

Q8. What may be the indication of leaking intake pipes?

Answer 7

A8. The engine runs rough at low r.p.m.

Question 8

Q9. What happens to engine power when the carburetor heat is applied?

Answer 8

A9 there is a noticeable drop in power.

Question 9

Q10. What could happen if carburetor heat is applied at high engine power settings?

Answer 9

A10. Detonation.

Question 10

Q11. What are two types of supercharged induction systems?

Answer 10

A11. Internally driven and externally driven.

Question 11

Q12. How and at what point does an internally driven supercharger boost air pressure?

Answer 11

A12. An (engine-driven) impeller compresses the fuel/air mixture after it leaves the carburetor.

Question 12

Q13. What is used to power a turbocharger?

Answer 12

A13. Engine exhaust gas directed onto the turbocharger turbine.

Question 13

Q14. What could result if the waste gate on a turbocharger does not close fully?

Answer 13

A14. 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 14

Q15. What function does a turbocharger waste gate perform?

Answer 14

A15. It controls the amount of exhaust gas either into or around the turbocharger, thus controlling the boot pressure of the turbocharger.

Question 15

Q16. What could cause a turbocharged engine to surge?

Answer 15

A16. There could be a waste gate or controller malfunction.

Question 16

Q17. What are the most common ways to control a waste gate?

Answer 16

A17. Either mechanically with linkages to the throttle or a separate control, or by an actuator that is driven by oil pressure.

Question 17

Q19. What is the function of a divergent-shaped jet engine inlet during subsonic flight?

Answer 17

A19. It causes the air velocity to decrease with a subsequent increase in air pressure.

Question 18

Q20. Where are bellmouth inlet ducts typically found?

Answer 18

A20. On helicopter engines.

Question 19

Q21. How do Venturi-type particle separators, found on many turbine powered helicopters, function?

Answer 19

A21. A Venturi is used to accelerate the flow of incoming air and debris through 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 20

Q22. What are the most common methods used for anti-icing of turbine engine ducts?

Answer 20

A22. Engine bleed air and electric heating elements.

Question 21

Q2. What could happen if the induction system becomes obstructed?

Answer 21

A2. 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.