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Mechanical Engineering :: Workshop Technology

  1. The metal extrusion process is generally used for producing

  2. A.

     Uniform solid sections

    B.

     Uniform hollow sections

    C.

     Uniform solid and hollow sections

    D.

     Varying solid and hollow sections


  3. The flux commonly used in brazing is

  4. A.

     Zinc chloride

    B.

     Ammonium chloride

    C.

     Resin plus alcohol

    D.

     Borax


  5. The centrifugal casting method, is used for casting articles of

  6. A.

     Symmetrical shape about vertical axis

    B.

     Symmetrical shape about horizontal axis

    C.

     Irregular shape

    D.

     Nonferrous metal only


  7. A casting defect which results in general enlargement of a casting is known as

  8. A.

     Shift

    B.

     Sand wash

    C.

     Swell

    D.

     Scab


  9. A casting defect which occurs near the ingates as rough lumps on the surface of a casting is known as

  10. A.

     Shift

    B.

     Sand wash

    C.

     Swell

    D.

     Scab


  11. When the molten metal is fed in the cavity of a metallic mould by gravity, the method of casting is known as

  12. A.

     Die casting method

    B.

     Slush casting method

    C.

     Permanent mould casting method

    D.

     Centrifugal casting method


  13. Swab is used for

  14. A.

     Smoothing and cleaning out depressions in the mould

    B.

     Cleaning the moulding sand

    C.

     Moistening the sand around the edge before removing pattern

    D.

     Reinforcement of sand in the top part of the moulding box


  15. The shrinkage allowance for cast iron pattern is

  16. A.

     10 mm/m

    B.

     16 mm/m

    C.

     20 mm/m

    D.

     26 mm/m


  17. The advantage of Thermit welding is that

  18. A.

     All parts of the weld section are molten at the same time

    B.

     Weld cools almost uniformly

    C.

     Results in a minimum problem with internal residual stresses

    D.

     All of the above


  19. When the dimension is expressed as 20 -0.025 ⁺⁰∙⁰³⁵, then the basic size is

  20. A.

     20 mm

    B.

     20.035 mm

    C.

     20.025 mm

    D.

     19.975 mm