Aircraft Systems

Question 1

Function of fuel primer

Answer 1

used to draw duel from the tanks to vaporize fuel directly into the cylinders prior to starting the engine

avoid overpriming (cause fire)

Lock primer to precent excessively rich fuel-air mixture

Question 2

Why are fuel tanks vented

Answer 2

To maintain atmospheric pressure inside the tank

allows fuel to expand with increases in temp without damaging the tank

Question 3

Running a fuel tank completely dry may do what

Answer 3

May allow air to enter the fuel system and cause vapor lock - makes it difficult to restart engine

Question 4

Ice formation in the aircraft fuel system results from

Answer 4

the presence of water in the fuel system

strain the sump during check

Question 5

The exhaust systems serve as a heat source for

Answer 5

the cabin and carburetor

Question 6

Risks of operating an aircraft with a defective exhaust heating system

Answer 6

CO poisoning, decreased engine performance, and increased potential for fire

Question 7

Electrical energy stored in a battery provides a source of electrical power for

Answer 7

Starting the engine and a limited supply of electrical power for use in the event the alternator fails

Question 8

How does an alternator work

Answer 8

Converts mechanical energy (the prop/engine) into electrical energy

powers electrical equipment and battery

Question 9

4 stroke process

Answer 9

1. Intake stroke
2. Compression Stroke
3. Power Stroke
4. Exhaust Stroke

Question 10

Intake Stroke

Answer 10

piston starts the downward travel. When this happens the intake valve opens and the fuel-air mixture is drawn into the cylinder.

Question 11

Compression Stroke

Answer 11

Intake Valve closes and the piston starts moving back to the top of the cylinder

Question 12

Power stroke

Answer 12

Fuel-air mixture is ignited - causes pressure increase in the cylinder and forces the pitston down and creates the power that turns the crankshaft

Question 13

Exhaust stroke

Answer 13

Used to purge the cylinder of burned gases

begins when the exhaust valve opens and piston starts to move toward cylinder head again

Question 14

Reason for twisted propeller blades

Answer 14

Difference in the actual speed of the various portions of the blade

tip travels faster than the base

the twist creates a uniform lift

Question 15

Pros of fixed pitch prop

Answer 15

Low-weight, simple, low cost

Question 16

Cons of fixed pitch prop

Answer 16

Fixed pitch achieves the best efficiency only at a given combination of airpseed and rpm

Fixed pitch is not optimal for cruise nor climb so performance suffers

Question 17

Throttle controls the

Answer 17

fuel-air flow to the engine

Question 18

As altitude changes the position of the throttle must be ____ to maintain ____

Answer 18

changed to maintain same rpm

as altitude is increased the throttle must be opened further to indicate the same rpm as a lower altitude.

Question 19

A constant-speed propeller is more efficient than other propellers because

Answer 19

it allows the selection of the most efficient engine rpm for the given conditions

Question 20

What does the induction system do

Answer 20

Brings air from the outside, mixes it with fuel, and delivers the fuel-air mixture to the cylinder where combustion occurs

Question 21

Two types of induction systems are common in small aircraft

Answer 21

1. Carburetor system
2. Fuel injection system