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Mechanical Engineering :: Compressors, Gas Turbines and Jet Engines

  1. For an irreversible gas turbine cycle, the efficiency and work ratio both depend on

  2. A.

     Pressure ratio alone

    B.

     Maximum cycle temperature alone

    C.

     Minimum cycle temperature alone

    D.

     Both pressure ratio and maximum cycle temperature


  3. For minimum work in multistage compression, assuming same index of compression in all stages

  4. A.

     Work done in first stage should be more

    B.

     Work done in subsequent stages should increase

    C.

     Work done in subsequent stages should decrease

    D.

     Work done in all stages should be equal


  5. In a single acting reciprocating air compressor, without clearance, the compression of air may be

  6. A.

     Isothermal

    B.

     Polytropic

    C.

     Isentropic

    D.

     Any one of these


  7. The propulsive power of the rocket is (where v₁ = Jet velocity, and v₂ = Aircraft velocity)

  8. A.

     (v₁² -v₂²)/2g

    B.

     (v₁ - v₂)²/2g

    C.

     (v₁² -v₂²)/g

    D.

     (v₁ - v₂)²/g


  9. Euler's equation is applicable for

  10. A.

     Centrifugal compressor

    B.

     Axial compressor

    C.

     Pumps

    D.

     All of the above


  11. The compressor capacity is defined as the

  12. A.

     Actual volume of the air delivered by the compressor when reduced to normal temperature and pressure conditions

    B.

     Volume of air delivered by the compressor

    C.

     Volume of air sucked by the compressor during its suction stroke

    D.

     None of the above


  13. In a single stage, single acting reciprocating air compressor without clearance volume, the work-done is maximum during

  14. A.

     Isothermal compression

    B.

     Isentropic compression

    C.

     Polytropic compression

    D.

     None of these


  15. In a single stage, single acting reciprocating air compressor, without clearance volume, the work-done is minimum during

  16. A.

     Isothermal compression

    B.

     Isentropic compression

    C.

     Polytropic compression

    D.

     None of these


  17. In a centrifugal compressor, the flow of air is ________ to the axis of compressor.

  18. A.

     Parallel

    B.

     Perpendicular

    C.

     Inclined

    D.

     None of these


  19. The most efficient method of compressing air is to compress it

  20. A.

     Isothermally

    B.

     Adiabatically

    C.

     Isentropically

    D.

     Isochronically