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1106 questions found
Acoustic linings made from composite materials are used in what section of the engine?
- Not used to suppress noise.
- Hot section and Cold Section.
- Cold section only.
i dont understand
For fire detection and extinguishing purposes, aircraft powerplant areas are divided into fire zones based on
- engine type and size.
- the volume and smoothness of the airflow through engine compartments.
- hot and cold sections of the engine.
i think this asnwer is also wrong my pdf says "The zoning layout will depend on the characteristics of the
individual engin"
Following the reports of a heavy landing you would
- carry out a complete visual examination of the power plant.
- examine the engine mountings and borescope the nozzle guide vanes and turbine.
- examine the engine mountings and fuse pins.
why not the mountings?
Screech liners in the afterburning jet pipe
- prevent unstable combustion.
- prevent cyclic vibrations of large amplitude.
- acts as noise suppressors.
i think the answer is wrong my textbook says that they act as noise suppressors.I quote "These are commonly called as Noise suppression liners or Noise
attenuation mattresses. When installed in the exhaust area these
are also known as Screech liners"
What happens to air flowing at the speed of sound when it enters a converging duct?
- Velocity increases, pressure and density decreases.
- Velocity, pressure and density increase.
- Velocity decreases, pressure and density increase.
Why?