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Mechanical Engineering :: Internal Combustion Engines

  1. Engine pistons are usually made of aluminium alloy because it

  2. A.

     Is lighter

    B.

     Wear is less

    C.

     Absorbs shocks

    D.

     Is stronger

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  3. The reason for supercharging in any engine is to

  4. A.

     Increase efficiency

    B.

     Increase power

    C.

     Reduce weight and bulk for a given output

    D.

     Effect fuel economy

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  5. Morse test can be conducted for

  6. A.

     Petrol engines

    B.

     Diesel engines

    C.

     Multi cylinder engines

    D.

     All of these

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  7. The cetane (C₁₆H₃₄) which is a straight chain paraffin, is assigned a cetane number of

  8. A.

     0

    B.

     50

    C.

     100

    D.

     120

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  9. Alpha-methyl-naphthalene (C₁₁ H₁₀) has a cetane number of

  10. A.

     0

    B.

     50

    C.

     100

    D.

     120

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  11. The scavenging efficiency of a four stroke cycle diesel engine is

  12. A.

     Below 50%

    B.

     Between 50 and 85%

    C.

     Between 85 and 95%

    D.

     Between 95 and 100%

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  13. Scavenging is usually done to increase

  14. A.

     Thermal efficiency

    B.

     Speed

    C.

     Power output

    D.

     Fuel consumption

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  15. Which of the following medium is compressed in a Diesel engine cylinder?

  16. A.

     Air alone

    B.

     Air and fuel

    C.

     Air and lub oil

    D.

     Fuel alone

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  17. Number of working strokes per min. for a four stroke cycle engine are _________ the speed of the engine in r.p.m.

  18. A.

     Equal to

    B.

     One-half

    C.

     Twice

    D.

     Four-times

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  19. Number of working strokes per min. for a two stroke cycle engine is _________ the speed of the engine in r.p.m.

  20. A.

     Equal to

    B.

     One-half

    C.

     Twice

    D.

     Four-times

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