Answers - Engine Instrument Systems


1. a
Electronic fuel flowmeters (vane-type or mass-flow type) are what many modern aircraft use to measure the amount of fuel consumed by an engine. Fuel flowmeters monitor the amount of fuel that flows past a given point and display this flow rate in the cockpit as pounds of fuel consumed per hour.

2. b
Most light aircraft equipped with continuous-fuel injection systems utilize a fuel flow indication system that measures the pressure drop across the injection nozzles to determine fuel flow (answer B). With this type of system, a higher fuel flow results in a greater pressure drop and a corresponding increase in fuel flow is indicated in the cockpit.

3. c
Most light aircraft equipped with continuous-fuel injection systems utilize a fuel flow indication system that measures the pressure drop across the injection nozzles to determine fuel flow. With this type of system, a higher fuel flow results in a greater pressure drop and a corresponding increase in fuel flow is indicated in the cockpit. However, if an injector nozzle becomes restricted, the pressure drop across the nozzle becomes greater and produces a false or high fuel flow reading.

4. a
In an autosyn system installed in the fuel system of turbine engine aircraft, fuel-flow data are transmitted using the aircraft's electrical system.

5. a
The only fuel flow indicating system that utilizes an impeller and turbine is the synchronous mass flow system. In this type of system both the indicator rotor and needle are driven by an electrical signal.

6. b
Most light twin-engine aircraft utilize a fuel flow indication system that measures the pressure drop across the injection nozzles to determine fuel flow. With this type of system, a higher fuel flow results in a greater pressure drop and a corresponding increase in fuel flow is indicated in the cockpit. However, if an injector nozzle becomes restricted, the pressure drop across the nozzle becomes greater and produces a false or high fuel flow reading.


7. b
The fuel flow indication used for fuel injected opposed engines is actually a measure of the pressure drop across the fuel injection nozzles. With this type of system, a higher fuel flow creates a greater pressure drop and a corresponding increase in the indicated fuel flow.

8. b
A computerized fuel system (CFS) utilizes a transducer mounted in the fuel line leading to the engine to provide fuel flow in gallons or pounds per hour, gallons or pounds remaining, time remaining for flight at the current power setting, and gallons used since startup or reset. Of the four items listed, three are provided by a CFS.

9. a
In both a motor driven impeller and turbine, and a motorless fuel flow indication system a flow meter transmitter converts the fuel's mass-flow rate into electronic signals that produce a fuel flow indication in the cockpit.

10. b
If an injector nozzle becomes restricted in an aircraft equipped with a pressure-drop type fuel flow indicating system the pressure drop across the nozzle increases and produces a false or high fuel flow indication.

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