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Engineering :: Turbo machines


1.  Which of the following preferred for supercharging of internal combustion engines?
A. Roots blower B. Axial flow compressor
C. Sliding vane type compressor D. Reciprocating compressor

2.  In an axial flow compressor, the pressure rise occurs in
A. fixed blades only B. Moving blades only
C. Both fixed and moving blades D. none of the above

3.  An axial flow compressor has
A. larger blades at gas entry and smaller blades at exit B. smaller blades at gas entry and larger blades at exit
C. identical dlades at exit as well as entry D. size of blades remains same only angles changes

4.  An axial flow compressor is suitable for
A. high volume flow rates with a small pressure rise B. high volume flow rates with high pressure rise
C. low volume flow rates with low pressure rise D. low volume flow rates with high pressure rise

5.  In a gas turbine cycle regenerator is used to
A. heat the gases coming out of combustion chamber B. heat fuel supplied to combustion chamber
C. heat air supplied to combustion chamber D. heat exhaust gases released from low pressure turbine

6.  A regenerator can be used on
A. open cycle gas turbines only B. closed cycle gas turbines only
C. both open as well as closed cycle gas turbines D. none of the above

7.  Thermal efficiency of a gas turbine cycle can be improved by
A. reheating between expansion stage B. intercooling between compression stges
C. regeneration D. any of the above

8.  Gas turbine used in aircraft is of
A. open cycle type B. closed cycle type with reheating
C. closed cycle type with reheating and regeneration and intercooling D. open cycle type with reheating, regeneration and intercooling

9.  A diffuser is used to
A. increase velocity and decrease pressure B. increase velocity as well as pressure
C. decrease velocity and increase pressure D. decrease velocity as well as pressure

10.  In which of the following heat exchanger, heat is extracted from air?
A. Regenerator B. Reheater
C. Intercooler D. All of the above




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