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A&P Powerplant Oral Practice Questions > Engine Fuel System > Flashcards

Engine Fuel System Flashcards

1
Q
  1. What is the purpose of filters in a fuel system?
A

Prevent foreign matter from entering carburetor

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2
Q
  1. Why do carburetors in aircraft have a mixture control?
A

Adjust air-fuel ratio when change altitudes due to density of air

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3
Q
  1. What two items are adjusted when setting idling conditions on a float carburetor?
A

Throttle stop for idle RPM
Idle mixture Through needle valve

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4
Q
  1. What is the purpose of fuel selector valves?
A

Shut off fuel
Cross feed for tank & engine selection
Fuel transfer

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5
Q
  1. What should be looked for when inspecting an engine driven fuel pump?
A

Fuel leaks & security of mounting

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6
Q
  1. What is the purpose of an engine driven fuel pump?
A

Delivers continuous supply of fuel @ proper pressure

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7
Q
  1. What type of fuel pump is generally used with large reciprocating engines
A

Positive displacement rotary vane type

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8
Q
  1. What happens to the excess fuel not required by the engine in a constant displacement pump?
A

Pressure relief valve opens routed back to inlet side of pump

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9
Q
  1. What is the most common type of fuel boost pump?
A

Electrically driven centrifugal type pump

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10
Q
  1. What are the functions of the boost pump?
A

For starting engine
Maintain pressure
Back up for engine driven pump

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11
Q
  1. What is the purpose of the bypass valve in the engine driven fuel pump?
A

Path around the pump vanes for starting & bypass pump in case of pump failure

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12
Q
  1. What is the purpose of using boost pumps in a fuel system?
A

Prevent fuel from engine driven pump from boiling at high altitudes

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13
Q
  1. What are the three general causes of vapor lock?
A

Low fuel pressure
High fuel temps
Turbulence

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14
Q
  1. Turbine engine fuel pumps may be divided into what two distinct system categories?
A

Constant & variable displacement

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15
Q
  1. What category is a turbine driven gear type pump?
A

Constant displacement

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16
Q
  1. What type of fuel pump can be made to vary the fuel flow at any speed?
A

Variable displacement type

17
Q
  1. What part of a gas turbine engine fuel system is very susceptible to the formation of ice?
A

Fuel filters

18
Q
  1. How is the engine fuel system protect from ice formation?
A

Fuel heaters

19
Q
  1. Why is a micron fuel filter provided with a bypass valve as a necessary safety factor?
A

Filter can clog

20
Q
  1. Where are fuel filters located?
A

At fuel pump
In line with system
Fuel controls

21
Q
  1. Can you sue automotive gasoline in a reciprocating engine in place of AVGAS?
A

Yes, if you have an STC

A&P Powerplant Oral Practice Questions (15 decks)

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