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Mechanical Engineering :: Internal Combustion Engines

  1. The mean effective pressure obtained from engine indicator indicates the

  2. A.

     Maximum pressure developed

    B.

     Minimum pressure

    C.

     Instantaneous pressure at any instant

    D.

     Average pressure


  3. The accumulation of carbon in a cylinder results in increase of

  4. A.

     Clearance volume

    B.

     Volumetric efficiency

    C.

     Ignition time

    D.

     Effective compression ratio


  5. If V₁ is the jet velocity and V₀ is the vehicle velocity, then propulsive efficiency of a turbojet engine is

  6. A.

     V₁ / (V₀ + V₁)

    B.

     V₀ / (V₀ + V₁)

    C.

     2V₀ / (V₀ + V₁)

    D.

     2V₁ / (V₀ + V₁)


  7. Which of the following is false statement?
    Excess quantities of sulphur in diesel fuel are Objectionable because it may cause the following

  8. A.

     Piston ring and cylinder wear

    B.

     Formation of hard coating on piston skirts

    C.

     Oil sludge in the engine crank case

    D.

     Detonation


  9. The basic requirement of a good combustion chamber is

  10. A.

     Minimum turbulence

    B.

     Low compression ratio

    C.

     High thermal efficiency and power output

    D.

     Low volumetric efficiency


  11. Crankcase explosion in I.C. engines usually occurs as

  12. A.

     First a mild explosion followed by a bi explosion

    B.

     First a big explosion followed by a mil explosion

    C.

     Both mild and big explosions occurs simultaneously

    D.

     Never occurs


  13. The thermal efficiency of a diesel cycle having fixed compression ratio, with increase in cut-off ratio will

  14. A.

     Increase

    B.

     Decrease

    C.

     Be independent

    D.

     May increase or decrease depending on other factors


  15. Which is more viscous lube oil?

  16. A.

     SEA 30

    B.

     SAE 50

    C.

     SAE 70

    D.

     SAE 80


  17. The reflectivity depends upon

  18. A.

     Geometry of the reflector

    B.

     Energy of neutrons

    C.

     Properties of the reflector

    D.

     All of these


  19. Which of the following fuel has little tendency towards detonation?

  20. A.

     Benzene

    B.

     Iso-octane

    C.

     Normal heptane

    D.

     Alcohol