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Mechanical Engineering :: Internal Combustion Engines

  1. The sensing element in the control system of nuclear reactors measures the _________ of the neutron flux in the reactor.

  2. A.

     Temperature

    B.

     Volume

    C.

     Density

    D.

     None of these


  3. In diesel engine, the compression ratio in comparison to expansion ratio is

  4. A.

     Same

    B.

     Less

    C.

     More

    D.

     Variable


  5. A fuel of an octane number rating of 75 matches in knocking intensity as a mixture of

  6. A.

     75% iso-octane and 25% normal heptane

    B.

     75% normal heptane and 25% iso-octane

    C.

     75% petrol and 25% diesel

    D.

     75% diesel and 25% petrol


  7. A fuel of cetane number 40 has the same ignition quality as a mixture of

  8. A.

     40% cetane and 60% alpha methyl naphthalene

    B.

     40% alpha methyl naphthalene and 60% cetane

    C.

     40% petrol and 60% diesel

    D.

     40% diesel and 60% petrol


  9. The term scavenging is generally associated with

  10. A.

     2-stroke cycle engines

    B.

     4-stroke cycle engines

    C.

     Aeroplane engines

    D.

     High efficiency engines


  11. The knocking tendency in spark ignition engines may be decreased by

  12. A.

     Controlling the air-fuel mixture

    B.

     Controlling the ignition timing

    C.

     Controlling the exhaust temperature

    D.

     Reducing the compression ratio


  13. The knocking in diesel engines may be prevented by

  14. A.

     Reducing the delay period

    B.

     Raising the compression ratio

    C.

     Increasing the inlet pressure of air

    D.

     All of these