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Mechanical Engineering :: Thermodynamics

  1. The efficiency of Diesel cycle with decrease in cut-off

  2. A.

     Increases

    B.

     Decreases

    C.

     First increases and then decreases

    D.

     First decreases and then increases


  3. Otto cycle consists of

  4. A.

     Two constant volume and two isentropic processes

    B.

     Two constant pressure and two isentropic processes

    C.

     Two constant volume and two isothermal processes

    D.

     One constant pressure, one constant volume and two isentropic processes


  5. Stirling cycle consists of

  6. A.

     Two constant volume and two isentropic processes

    B.

     Two constant volume and two isothermal processes

    C.

     Two constant pressure and two isothermal processes

    D.

     One constant volume, one constant pressure and two isentropic processes


  7. Carnot cycle consists of

  8. A.

     Two constant volume and two isentropic processes

    B.

     Two isothermal and two isentropic processes

    C.

     Two constant pressure and two isentropic processes

    D.

     One constant volume, one constant pressure and two isentropic processes


  9. When cut-off ratio is __________ the efficiency of Diesel cycle approaches to Otto cycle efficiency.

  10. A.

     Zero

    B.

     1/5

    C.

     4/5

    D.

     1


  11. Reversed Joule cycle is known as

  12. A.

     Carnot cycle

    B.

     Bell-Coleman cycle

    C.

     Rankine cycle

    D.

     Stirling cycle


  13. The same volume of all gases would represent their

  14. A.

     Densities

    B.

     Specific weights

    C.

     Molecular weights

    D.

     Gas characteristic constants


  15. If both Stirling and Carnot cycles operate within the same temperature limits, then efficiency of Stirling cycle as compared to Carnot cycle

  16. A.

     More

    B.

     Less

    C.

     Equal

    D.

     Depends on other factors


  17. The compression ratio for Diesel engines is

  18. A.

     15 to 20

    B.

     5 to 8

    C.

     3 to 6

    D.

     20 to 30


  19. The efficiency of the Carnot cycle is (where T1 and T2 = Highest and lowest temperature during the cycle)

  20. A.

     (T1/T2) - 1

    B.

     1 - (T1/T2)

    C.

     1 - (T2/T1)

    D.

     1 + (T2/T1)