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Mechanical Engineering :: Internal Combustion Engines

  1. A gas engine has a swept volume of 300 cm3 and clearance volume of 25 cm3. Its volumetric efficiency is 0.88 and mechanical efficiency is 0.90. The volume of the mixture taken in per stroke is

  2. A.

     248 cm3

    B.

     252 cm3

    C.

     264 cm3

    D.

     286 cm3


  3. The pressure at the end of compression, in diesel engines, is approximately

  4. A.

     10 bar

    B.

     20 bar

    C.

     25 bar

    D.

     35 bar


  5. The pressure at the end of compression, in petrol engines, is approximately

  6. A.

     10 bar

    B.

     20 bar

    C.

     25 bar

    D.

     35 bar


  7. Air fuel ratio for idling speed of a petrol engine is approximately

  8. A.

     1 : 1

    B.

     5 : 1

    C.

     10 : 1

    D.

     15 : 1


  9. The specific fuel consumption per BH hour for a petrol engine is approximately

  10. A.

     0.15 kg

    B.

     0.2 kg

    C.

     0.25 kg

    D.

     0.3 kg


  11. The specific fuel consumption per BHP hour for diesel engine is approximately

  12. A.

     0.15 kg

    B.

     0.2 kg

    C.

     0.25 kg

    D.

     0.3 kg


  13. The maximum propulsive efficiency of a turbojet engine is at a speed of

  14. A.

     1000 km/h

    B.

     2000 km/h

    C.

     2400 km/h

    D.

     3000 km/h


  15. The method of determination of indicated power of a multi cylinder spark ignition engine is by the use of

  16. A.

     Morse test

    B.

     Prony brake test

    C.

     Motoring test

    D.

     Heat balance test


  17. The air-fuel ratio of the petrol engine is controlled by

  18. A.

     Fuel pump

    B.

     Governor

    C.

     Injector

    D.

     Carburettor


  19. The air-fuel ratio in petrol engines is controlled by

  20. A.

     Controlling valve opening/closing

    B.

     Governing

    C.

     Injection

    D.

     Carburetion