Aircraft_General_15.doc - Aircraft General Knowledge...

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Aircraft General Knowledge Progress Test 15 – Jet Engines 1.Airflow through a convergent duct will cause: (a)increase in velocity & pressure(b)decrease in velocity & increase in pressure(c)increase in velocity & decrease in pressure(d)decrease in velocity & pressureSolution:A convergent duct will cause an increase in velocity and areduction in pressure and temperature. 2.Continuous ignition should be used 3.Igniter plugs spark approximately: 4. The high energy ignition system may be supplied by the … .... electrical system and works by (a) AC or DC opening and closing contact breaker points (b) AC a step-up transformer increasing the voltage (c) DC or AC repeated discharge of capacitors (d) AC the use of a circuit breaker Solution: Ignitors can be powered either by DC or AC using capacitors to store and deliver the high energy charge. 5.The fuel/air ratio for a combustion chamber primary zone is:
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6.In an impulse turbine and stator vane unit, the gas velocity ……….. and the pressure………...: (a)increases in the stator vanesdecreases in the stator vane(b)increases in the stator vanesincreases in the rotor vanes(c)stays constant in the stator vanes decreases in the stator vanes(d)increases in the stator vanesincreases in the rotor vanesSolution:The gas is channelled on to the impulse rotor by the statorvanes which have a convergent duct to increase the speed andreduce the pressure. Velocity decreases and pressurecontinues to decrease when the air hits the rotor vanes whichact like a water wheel to turn the turbine. See animation. 7.Reverse thrust on a high bypass ratio engine is obtained by
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  • Fall '19
  • Gas turbine, Gas compressor, Axial compressor

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