Jeppesen Oral- Chapter 7 (Engine Fuel and Fuel Metering)

Answer 1

Bleed air and engine lubricating oil

Answer 2

float-type carburetors, pressure injection carburetors and direct fuel injection systems

Answer 3

controls the fuel/air mixture

Answer 4

Excessively rich mixture

Answer 5

Provides immediate and brief flow of fuel flow in venturi to enrich mixture

Answer 6

Power enrichment system that provides richer mixture at high power settings, where the excess fuel helps in engine cooling .Functions are settings above cruise power

Answer 7

The engine is operating normally

Answer 8

To clear the engine

Answer 9

Engine driven fuel pump

Answer 10

Engine shuts off

Answer 11

A sealed brass aneroid capsule is connected to the fuel metering system, and expands and contracts with changes in pressure and temperature, adjusting the mixture accordingly

Answer 12

Less danger of induction icing Better acceleration Better fuel distribution Better fuel economy Not limited in maneuvers

Answer 13

They automatically meter fuel to the engine

Answer 14

Hydro-mechanical and electronic

Answer 15

power lever position, engine rpm, compressor inlet temperature, compressor inlet pressure, compressor discharge pressure, burner pressure

Answer 16

Electronic control unit and the hydro mechanical fuel control

Answer 17

Better fuel economy, improved starts, requires no engine trimming, provides constant idle speeds regardless of ambient conditions

Answer 18

They inject fuel into the combustion area

Answer 19

EPR or RPM

Answer 20

Fuel SPG, idle rpm, maximum rpm, max EPR

Answer 21

variable displacement pump

Answer 22

Fuel strainer

Answer 23

Returns excess fuel to the inlet side of the pump

Answer 24

rotary vane pump

Answer 25

Supply pressurized fuel to the fuel pump which helps prevent vapor lock and cavitation

Answer 26

centrifugal type

Answer 27

Caused by insuficne t fuel pressure, high fuel temperatures which may block fuel to the engine

Answer 28

Provides continous supply of fuel and proper pressure while engine is running

Answer 29

constant and variable displacement

Answer 30

Constant displacement

Answer 31

leaks and secure mounting

Answer 32

If one element seizes, a portion of the dirve shaft seizes and allows the other element to continue

Answer 33

Fuel filter is most likely. Fuel heaters which use oil heat heat exchanges or bleed air to warm

Answer 34

Allows fuel to flow to the engine when the filter becomes blocked

Answer 35

Discharges two different fuel patterns. The spray pattern is wider at engine start up and narrows when engine speed is above idle

Answer 36

Pressurizing portion provides primary and secondary fuel flow to dual-line duplex fuel nozzles Dump portion allows fuel to drain from the manifolds after engine shutdown

Answer 37

Allow tank and engine selection, provides means for shutting off fuel flow