Help with discussion

I. Answer the following questions  

1. What is meant by the general expression 'Turbines have a memory'? Also, describe 'feathering' when talking props. 
2. Explain why a modern turbine engine is easier to analyze (from an accident investigation
   perspective) than a reciprocating engine.
3. What is meant by 'critical flows' needed by a turbine aircraft? 
4. How do these questions and your answers relate to an investigation?