M15 Gas Turbine Engine Sub-Module No 4 (Quiz 1)

 

15.4 Compressors

Quiz

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1. The two main functional elements of centrifugal compressor are the ?
   1.   Rotor and stator
   2.   Impeller and diffuser
   3.   Compressor and turbine
2. The combination of the compressor stages and turbine stages on a common shaft is an engine referred to as ?
   1.   Manifold assy
   2.   Engine spool
   3.   Pulse jet
3. Compression ratio varies with …… ?
   1.   Rpm
   2.   Egt
   3.   Burner pressure
4. Compressors are designed to be most efficient in the ?
   1.   Lower rpm range of operation
   2.   Higher rpm range of operation
   3.   Higher temperature range
5. If a conversion from pressure to velocity is needed ……………………….. Which type of duct Is used ?
   1.   A convergent duct
   2.   A divergent duct is used
   3.   No ducting is required for this conversion
6. One of the following is not a centrifugal compressor advantage ?
   1.   Losses in turns between stages
   2.   High pressure rise per stage
   3.   Low weight
7. Stall or surge are accompanied by rapid changes in ……… ?
   1.   Rpm only
   2.   Egt only
   3.   Rpm, egt,epr
8. These can be balanced without disassembly of the engine ?
   1.   Hpc front blades
   2.   Fan blades
   3.   Turbine blades
9. The variable stator vanes or vsv are located………?
   1.   In front of rotor blades
   2.   Behind the rotor blades
   3.   Behind the diffuser section
10. The main difference between variable inlet guide vane (vigv) and a variable stator vane (vsv) is ?
    1.   Their position with regard to the rotor blades
    2.   The angle of air dilevery to compressor
    3.   Pressure rise per stage