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Reciprocating Engine > FINAL REVIEW > Flashcards

FINAL REVIEW Flashcards

1
Q

Why do we use a reduction gearbox for the engine?

A

-To reduce rotational speed of the propeller and prevents it from exceeding its designated speed at the tip of the prop.

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2
Q

Most common method to prevent carb icing?

A

-Pre- heat the air before entering the carburetor by either a heat muffler or engine compartment air. (Carb Heat)

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3
Q

What is the formula for work?

A

Work= Force * Distance Travelled

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4
Q

Why are laminated pole shoes used in magnetos?

A

To reduce eddy currents. Keeps magneto cool and boosts efficiency

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5
Q

What are the two forces that oppose each other in a CSU governor?

A

Speeder Spring Tension and Governor Fly Weights

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6
Q

Oil booster pump incorporated in the lower case of a governor of a CSU unit is necessary for?

A

-Move the propeller to fine pitch.

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7
Q

What is Torque?

A

-A twisting force that tends to cause rotation.

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8
Q

What component is used to prevent over housing

A

-Pressure valves and bootstrap

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9
Q

What does Wastegate control?

A

-Controls the amount of exhaust gas is passed through the turbine

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10
Q

Wastegate full open?

A

-Gases bypass engine

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11
Q

Wastegate full closed?

A

-Gases through engine

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12
Q

What is the approximate thermal efficiency of an internal combustion engine?

A

-30% heat energy into mechanical energy

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13
Q

What is Pre- Ignition?

A

-When the fuel/air mixture is already mixed causing the combustion to pre- ignite before actual ignition. This happens because of a hot spot in the cylinder.

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14
Q

What is Detonation?

A

-The uncontrollable explosion of fuel/air mixture. Engine knocking. Normally occurs due to using lower fuel grade.

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15
Q

What is the Compression Ratio?

A

Total Volume of Cylinder/ Combustion Chamber Volume

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16
Q

What are the 3 types of Carburetor Icing?

A
  • Fuel Evaporation Ice
  • Throttle Ice
  • Impact Ice
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17
Q

What is Upper Deck Pressure?

A

-Pressure after blower but before the throttle

18
Q

What is Maximum Upper Deck Pressure?

A

-Absolute pressure controller functions to limit

19
Q

What is sensed by the APC, Rate of Change and Pressure Ratio Controller through the oil flow of the wastegate?

A

-Upper Deck Pressure

20
Q

Pressure Controller setting is how many times the ambient pressure?

A

2.2

21
Q

What does the Rate of Change controller function to?

A

-Limits the UPD from 2.0-6.5 Hg to reduce turbine acceleration over boosts

22
Q

What is Bernoulli’s Principle?

A

-When Velocity increases, Pressure decreases

23
Q

What is the function of the main metering system?

A

-To supply fuel flow at all conditions above idle

24
Q

Where is the fuel nozzle in the pressure carb?

A

-Downstream of the venture therefore it is less susceptible to icing

25
Q

What are the two adjustments on the Pressure Carb?

A
  • Idle Mixture

- Idle Speed

26
Q

What type of coils do magnetos have?

A

-Primary and Secondary

27
Q

What is the Mag Speed?

A

-100-200 RPM

28
Q

What does impulse coupling do when it increases the rotational speed of the magneto?

A

-Retards the spark to TDC to prevent kick back

29
Q

What type of electrode would be least prone to lead deposits?

A

-Fine wire

30
Q

What type of Oil Pumps do Lycoming Engines use?

A

-Gear type (constant displacement pumps)

31
Q

What does an Oil Spec of 10W30 mean?

A
  • 10 = Less viscosity when oil is cold.
  • W = Winter/Cold weather conditions
  • 30 = High viscosity when oil is hot.
32
Q

Oil with no additive used for engine brake in is?

A

-Mineral oils

33
Q

Pour point is?

A

the lowest temperature at which a substance will flow under given conditions.

34
Q

What kind of sump does a radial engine have?

A

-Dry Sump

35
Q

What is the main factor contributing to Carb Icing?

A

-Humidity

36
Q

What is the most common way to prevent Carb Icing?

A

-Pre- heat the air before it enters the carburetor by a heat muffler or engine compartment air. (Carb Heat)

37
Q

What happens when Carburetor powers down and Carburetor heat goes up?

A

-Rich Mixture

38
Q

A plain connecting rod is used in what type of engines?

A

-Opposed or Inline

39
Q

Radial Engines have what type of connecting rods?

A

-Master Rod

40
Q

In addition to the pressure pump, the dry sump system has what kind of pump?

A

-Scavenge Pump

Reciprocating Engine (10 decks)

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