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Engineering :: Turbo machines


21.  The flow on two sides of a normal shock wave is
A. subsonic B. sonic
C. supersonic D. supersonic on one side and subsonic on the other side

22.  The diverging portion of the nozzle acts as a diffuser for
A. the subsonic flow B. the supersonic flow
C. both the subsonic as well as supersonic flow D. none of the above

23.  A diffuser
A. converts kinetic energy into thermal energy B. converts potential energy into kinetic energy
C. converts pressure energy into kinetic energy D. converts thermal energy into kinetic energy

24.  Brayton cycle cannot be used in reciprocating engines even for same compression ratio and work output because
A. Otto cycle is more efficient B. Brayton cycle is less efficient
C. Brayton cycle is for slow speed engines only D. Large volume of low pressure gas cannot be efficiently handled in reciprocating engines

25.  Actual gas turbine cycle is different from ideal cycle because
A. of internal irreversibility of the process due to friction, turbulence, etc. B. of variation of specific heats with temperature
C. of losses due to incomplete combustion D. all of the above

26.  The advantage of a gas turbine over a reciprocating engine is
A. perfect balancing of rotor B. continuous and uniform power
C. usually small working pressures D. all of the above

27.  Overall efficiency of a gas turbine is
A. equal to Rankine cycle efficiency B. equal to Carnot cycle efficiency
C. less than Diesel cycle efficiency D. more than Otto or Diesel cycle efficiency

28.  Air fuel ratio for a gas turbine is closer to
A. 10 ; 1 B. 15 ; 1
C. 20 ; 1 D. 60 ; 1

29.  Which of the following is a positive displacement rotory compressor?
A. Roots blower B. Centrifugal compressor
C. Axial flow compressor D. All of the above

30.  All of the following are positive displacement compressors EXCEPT :
A. Screw compressor B. Axial flow compressor
C. Roots blower D. Vane blower




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