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Mechanical Engineering :: Thermodynamics

  1. For the same compression ratio, the efficiency of Diesel cycle is __________ Otto cycle.

  2. A.

    greater than

    B.

    less than

    C.

    equal to


  3. Mond gas is obtained by

  4. A.

    partial combusion of coal, coke, anthracite coal or charcoal in a mixed air steam blast

    B.

    carbonisation of bituminous coal

    C.

    passing steam over incandescent coke

    D.

    passing air and a large amount of steam over waste coal at about 650°C


  5. The natural solid fuel is

  6. A.

    wood

    B.

    coke

    C.

    anthracite coal

    D.

    pulverised coal


  7. The condition for the reversibility of a cycle is

  8. A.

    the pressure and temperature of the working substance must not differ, appreciably, from those of the surroundings at any stage in the processall the processes, taking place in the cycle of operation, must be extremely slow

    B.

    all the processes, taking place in the cycle of operation, must be extremely slow

    C.

    the working parts of the engine must be friction free

    D.

    the working parts of the engine must be friction free


  9. In open cycle gas turbine plants

  10. A.

    the indirect heat exchanger and cooler is avoided

    B.

    direct combustion system is used

    C.

    a condenser is used

    D.

    all of the above